KR101442064B1 - In insulating oil gas analyzer apparatus and method - Google Patents

Abstract

The present invention relates to a method for analyzing gas in dielectric oil of an apparatus such as a transformer in which a dielectric oil is embedded and a gas analyzer in an insulating oil and a transformer in which dielectric oil is embedded. According to the present invention, The gas analyzer in the insulating oil and the analyzing method in the insulating oil that can detect the concentrations of various gases with high reproducibility can be realized.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method for analyzing gas in an insulating oil,

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a general view showing the configuration of a gas analyzer in an insulating oil installed in an insulating inflow transformer according to an embodiment of the present invention;

Fig. 2 is a flow chart showing a procedure of analyzing gas in insulating oil in a gas analyzer of insulating oil, which is one embodiment of the present invention shown in Fig. 1; Fig.

FIG. 3 is a general view showing the open / close state of the four-way valve at the time of extracting the dissolved gas in the oil in the insulating oil gas analyzer according to the embodiment of the present invention shown in FIG.

Fig. 4 is a general view showing an open / close state of a four-way valve when measuring a sample gas in an insulating oil gas analyzer according to an embodiment of the present invention shown in Fig.

FIG. 5 is a characteristic diagram schematically showing the output of a semiconductor sensor for detecting the gas concentration of various gases dissolved in an insulating oil gas analyzer according to an embodiment of the present invention shown in FIG. 1;

FIG. 6 is a calculation block diagram showing a sequence for calculating the gas concentration of various gases dissolved in the calculator of the gas analyzer in the insulating oil, which is one embodiment of the present invention shown in FIG. 1;

FIG. 7 is a general view showing the configuration of a gas analyzer of a portable type which is another embodiment of the present invention;

Fig. 8 is a flow chart showing a procedure of analyzing gas in insulating oil in a gas analyzer of insulating oil, which is another embodiment of the present invention shown in Fig. 7;

Fig. 9 is an overall view showing the open / close state of the four-way valve at the time of extracting the dissolved gas from the insulating oil in the insulated oil gas analyzer according to another embodiment of the present invention shown in Fig.

Fig. 10 is an overall view showing the open / close state of the four-way valve when measuring the sample gas in the insulating gas oil analyzer according to another embodiment of the present invention shown in Fig. 7;

Fig. 11 is a calculation block diagram showing a sequence for calculating the concentration of gas of various gases dissolved in an arithmetic unit in an insulating oil gas analyzing apparatus according to another embodiment of the present invention shown in Fig. 7,

12 is a general view showing a monitoring apparatus for a transformer having a gas analyzer in insulating oil according to still another embodiment of the present invention.

13 is a view showing the structure of a gas sampling unit of a gas analyzer in insulating oil according to another embodiment of the present invention,

Fig. 14 is a view showing the structure of a groove attachment flange of a gas collecting portion according to another embodiment of the present invention shown in Fig. 13;

Fig. 15 is a view showing the groove-like gas storage chamber of the gas sampling unit of another embodiment of the present invention shown in Fig. 13,

FIG. 16 is a view showing a groove-like gas storage chamber of a gas collecting portion of another embodiment of the present invention shown in FIG. 13 provided with a groove attachment flange having a zigzag shape;

Fig. 17 is a view showing that the groove-shaped gas storage chamber of the gas sampling section of another embodiment of the present invention shown in Fig. 13 is provided with a groove attachment flange in a spiral shape.

[Description of Drawings]

1: Inflow transformer 2: Insulating oil

3: Gas extractor 4: Open valve

5A, 5B: Oil feed pump 6: Nitrogen bombardment

7: oxygen cylinder 8A, 8B: regulator

9A, 9B: Flow meter 10: Four-way switching valve

11: air pump 12: filter

13: gas regulating device 14: thermostat

15: gas detector 16: computer

17: Check valve 18A: Nitrogen supply pipe

18B: oxygen supply pipe 18C1: gas supply system pipe

18C2: Gas extraction system piping

18D: Dissolved gas mixture in gas supply piping

18E: sample gas supply pipe 18F: air supply pipe

18G: discharge pipe 20, 30: gas analyzer

31: air purifier

201, 202, 203, 204, 205:

210: Monitoring device 220: Setting device

230: Display devices 301, 302, 303: Operator

310: Monitoring device 320: Setting device

330: Display device 501: Insulating oil injector

502: Oil outlet

401, 402, 403: In-line gas analyzer with communication means

420: central monitoring device 430: telephone line

450: cellular phone line 440: wireless line

S1, S2, S3, S4, S5, S6, S7:

1101: Groove attachment flange 1102: Gas permeable membrane

1103: groove-shaped gas storage chamber 1104: carrier gas supply port

1105: carrier gas extraction ports 1106a, 1106b, 1106c: valve

1107: packing 1201:

1202: Inlet valve 1203: Insulating oil

1300: Carrier gas supply unit 1400: Gas measurement unit

1501: piping 1502: piping

1503: Piping

The present invention relates to a method for analyzing gas in insulating oil of an apparatus such as a transformer with a built-in insulating oil and a transformer with a built-in insulating oil.

Japanese Patent Laid-Open Publication No. 59-160745 discloses a method for separating gas in dielectric oil by using a gas permeable material as one of the prior arts of gas oil analyzing apparatus in insulating oil relating to the oil of the transformer, A plurality of arithmetic expressions showing the relationship between the gas concentration and the reaction characteristic are detected by using a plurality of semiconductor sensors which react with the separated gases in the several kinds of gases, , Carbon monoxide, carbon dioxide methane, ethane, ethylene, and acetylene.

As a conventional technique relating to a gas analysis apparatus for insulating oil, Japanese Unexamined Patent Publication No. 5-52787 discloses a sensor which reacts only with hydrogen without separating the dissolved gas in oil extracted by various gas extraction methods into a single gas, Discloses a technique of detecting hydrogen and acetylene by a semiconductor sensor such as a sensor to be reacted.

In the same way, Japanese Patent Application Laid-Open No. 6-160329 discloses a sensor for reacting only with hydrogen without separating the dissolved gas in oil extracted by various gas extraction methods into a single gas, Carbon monoxide, and total combustible gas by a semiconductor sensor such as a sensor which responds to a total combustible gas such as hydrogen, carbon monoxide, methane, ethane, ethylene, or acetylene.

As a conventional technique relating to a gas analyzer in insulating oil, Japanese Patent Application Laid-Open No. 5-346414 discloses a technique of correcting the temperature correction coefficient in accordance with the temperature change of the extracted dissolved gas in the oil, .

If an abnormality such as discharge or overheating inside the inflow transformer, sealing or deterioration of the built-in insulating oil occurs, the insulating oil is decomposed and gas is generated in the oil. The amount of gas generated in the oil and the pattern of gas generation vary depending on the type of the inside of the transformer. Therefore, it is possible to determine the type and degree of the above by examining the amount of gas generation or the pattern of gas generation and referring to past cases. Therefore, conventionally, as an oil deterioration or abnormality diagnosis method of an oil inflow transformer, analysis of gas dissolved in insulating oil (hereinafter referred to as oil gas analysis) has been carried out.

[Patent Document 1]

Japanese Patent Application Laid-Open No. 59-160745

[Patent Document 2]

Japanese Patent Application Laid-Open No. 5-52787

[Patent Document 3]

Japanese Patent Application Laid-Open No. 6-160329

[Patent Document 4]

Japanese Patent Application Laid-Open No. 5-346414

A semiconductor sensor comprising a metal oxide such as tin oxide, tungsten oxide, or zirconium oxide, which is a general-purpose semiconductor sensor that detects gas in a gas analysis apparatus based on various gas extraction methods, has characteristics of reacting with various gases, There is a problem that the concentration of a specific gas can not be accurately detected. In addition, as a characteristic of a semiconductor sensor, there is a problem that the output of the sensor is not constant even with respect to a specific gas constant in concentration, and the sensor output is changed. It is believed that this is caused by the influence of moisture or contaminants attached to the semiconductor sensor surface.

In the gas detection methods described in Patent Documents 1 and 4, only the gas in the insulating oil is measured by the semiconductor sensor, but the sensor output is not constant and the measurement reproducibility can not be obtained.

In the gas detection method described in Patent Document 2 and Patent Document 3, only the gas in the insulating oil is measured by the semiconductor sensor, but the sensor output is not constant and measurement reproducibility can not be obtained.

In the gas detection method according to Patent Document 2 and Patent Document 3, the gas concentration is determined by using a semiconductor sensor having gas selectivity, but the semiconductor sensor having gas selectivity is fixed so as to be detectable only to hydrogen, carbon monoxide, and acetylene And the concentration of each gas component of methane, ethane, and ethylene can not be detected.

It is an object of the present invention to provide a gas analyzer in insulating oil and a method of analyzing gas in insulating oil which enable detection of concentration of various gases having high reproducibility of detection using a versatile semiconductor sensor.

A gas analyzing apparatus for insulated oil according to the present invention comprises a gas extractor for extracting an insulating oil contained in a device from an apparatus and a plurality of gas sensors for detecting the concentration of the component gas from a plurality of component gases contained in the insulating oil drawn into the gas extractor A supply system of a sample gas for sampling a plurality of component gases contained in the insulating oil drawn out to the gas extractor and supplying the same to the gas detector as a sample gas to be measured; And a reference gas supply system for converting the supply system of the sample gas and the supply system of the reference gas to supply the gas to the gas detector; A sample gas and a reference gas are detected based on the respective detection values measured by the plurality of semiconductor sensors of the gas detector And a gas analyzer in an insulating oil having an arithmetic unit for calculating the concentration of a plurality of component gases dissolved in the insulating oil.

In the method for analyzing gas in insulating oil according to the present invention, the insulating oil contained in the device is taken out and supplied to the gas extracting device, a plurality of component gases contained in the insulating oil are extracted from the insulating oil drawn out to the gas extracting device, The reference gas serving as a reference of the detection values of a plurality of semiconductor sensors provided in the gas detector can be supplied to the gas detector through the supply system of the reference gas The reference gas supplied through the supply system of the sample gas and the reference gas supplied through the supply system of the reference gas are converted and supplied to the gas detector to select and supply the sample gas from the plurality of component gases contained in the sample gas. And the concentration of the reference gas are detected by a plurality of semiconductor sensors provided in the gas detector, Fee is characterized in that is configured to obtain, by the concentration of a plurality of gas components contained in the gas and the reference plurality of sample gas on the basis of the respective detection values are measured by a semiconductor sensor of a gas detector with respect to the gas in the operation.

Next, a gas analyzer in insulating oil installed in an insulated inflow transformer according to an embodiment of the present invention will be described with reference to the drawings.

(Example 1)

As a first embodiment of the present invention, FIG. 1 shows the construction of a gas analyzer 20 in an insulating oil installed in an insulating inflow transformer according to an embodiment of the present invention. The gas analyzer 20 is installed in a transformer Type gas oil analyzer. In the insulated oil gas analyzer installed in the insulated inflow transformer of this embodiment, hydrogen gas, carbon monoxide, acetylene, ethylene, methane and ethane are analyzed for gas in the gas.

In Fig. 1, the insulating oil 2 is filled in the insulated inflow transformer 1. The insulated oil gas analyzer 20 is connected to the insulated inflow transformer 1 via a pipe 25A and a pipe 25B and is connected to a gas extractor (not shown) through which the insulated oil 2 flows in and out from the insulated inflow transformer 1 3, the gas extractor 3 extracts gas generated in the oil of the insulating oil 2 sealed or embedded in the insulating inflow transformer 1 by the bubbling method.

An opening valve (4) is provided in the body of the gas extractor (3). The piping 25A and 25B are provided with oil feed pumps 5A and 5B respectively and the oil feed pump 5A supplies the insulating oil 2 of the input transformer 1 to the gas extractor 3 by a predetermined amount. The oil feed pump 5B returns the insulating oil 2 after gas extraction from the gas extractor 3 to the inflow transformer 1. [

A nitrogen bomb 6 for supplying nitrogen is provided and the nitrogen is led from the nitrogen bomb 6 through the nitrogen supply pipe 18A to the four-way valve 10 which will be described later. An oxygen cylinder (7) for supplying oxygen is also provided, and oxygen is led from the oxygen cylinder (7) to the gas regulator (13), which will be described later, through an oxygen supply line (18B).

Regulators 8A and 8B are respectively installed in the nitrogen supply pipe 18A and the oxygen supply pipe 18B and are connected to the four way valve 10 and the gas regulator (not shown) from the nitrogen bomb 6 and the oxygen bomb 7 13 to regulate the pressures of nitrogen and oxygen, respectively.

Similarly, flow meters 9A and 9B are provided in the nitrogen supply pipe 18A and the oxygen supply pipe 18B, respectively. The nitrogen gas cylinder 6 and the oxygen cylinder 7 are connected to the four-way valve 10, And the flow rates of nitrogen and oxygen supplied to the exhaust pipe 13 are measured.

The four-way selector valve 10 includes a nitrogen supply pipe 18A for supplying nitrogen from the nitrogen bomb 6 and a gas supply system 18 for guiding the nitrogen supplied through the nitrogen supply pipe 18A to the gas extractor 3 And is connected to the pipe 18C1.

Then, the four-way conversion valve 10 is converted and operated to form a flow path for supplying the nitrogen gas from the nitrogen bomb 6 to the gas extractor 3 through the nitrogen supply pipe 18A and the gas supply system pipe 18C1.

The four-way converter valve 10 includes a gas extracting system piping 18C2 for extracting a dissolved gas mixture in the oil generated in the oil of the insulating oil 2 sealed in the inlet transformer 1 from the gas extractor 3, , And is connected to a dissolved gas mixed gas supply line 18D for in-oil dissolved gas which is led through the gas extraction system piping 18C2 to the gas regulator 13.

The four-way switching valve 10 is then operated to convert the dissolved gas mixture in the air from the gas extractor 3 through the gas extraction system piping 18C2 and the dissolved gas mixture gas supply piping 18D to the gas detector 15 are formed.

An air pump 11 is provided in the gas supply system piping 18C1, and bubbling is performed by operating the air pump 11. The filter 12 is installed in the gas extractor 3 and the dissolved gas mixture in the oil generated in the oil of the insulating oil 2 sealed in the inlet transformer 1 led to the gas extractor 3 is subjected to gas extraction When the gas is led out from the gas extractor 3 to the four-way valve 10 through the system piping 18C2, the oil mist mixed and mixed with the dissolved gas in the air is removed.

The dissolved gas mixture in the oil generated in the oil of the insulating oil 2 sealed in the inlet transformer 1 led to the gas extractor 3 is supplied to the gas extraction system piping 18C2 , The dissolved gas mixture pipe 18D for the dissolved gas in the air, and the sample gas supply pipe 18E.

A gas regulating device 13 is provided at a connection portion of the dissolved gas mixture pipe 18D and the sample gas supply pipe 18E to supply oxygen from the oxygen cylinder 7 to the gas regulating device 13 And an oxygen supply pipe 18B are connected.

The oxygen gas is mixed at a predetermined ratio into the dissolved gas mixture in the gas supplied to the gas detector 15 by the gas adjusting device 13 to generate the sample gas. The sample gas generated in the gas adjusting device 13 is supplied to the temperature controller 14 through the sample gas supply pipe 18E and mixed with the nitrogen, oxygen and dissolved dissolved gas in the gas adjusting device 13 The temperature of the sample gas is adjusted to a predetermined temperature by the temperature controller (14).

A semiconductor sensor composed of a metal oxide such as tin oxide, tungsten oxide, or zirconium oxide is provided in the gas detector 15. By this semiconductor sensor, a mixed gas of nitrogen and oxygen, which is a reference gas, Gas mixture gas, and outputs the measured values to the computer 16 as an output signal.

The computer 16 calculates the gas component concentration of the dissolved gas in the oil based on the output signal from the semiconductor sensor provided in the gas detector 15 and displays the gas component concentration or the like of the calculated dissolved gas in the monitor on a monitor or the like .

The computer 16 may also be configured to instruct the respective elements to turn on or off the pumped flow constituting the gas analysis apparatus for the in-oil gas installed in the inflow transformer of the embodiment of the present invention, or to perform the conversion operation or the opening and closing operation of the conversion valve, Consists of.

The gas components of the sample gas in which the nitrogen, oxygen and dissolved dissolved gas detected by the semiconductor sensor provided in the gas detector 15 are mixed is discharged to the outside through the discharge pipe 18G after detecting the concentrations of the respective gas components, The discharge pipe 18G is provided with a check valve 17 to prevent the outside gas from flowing into the gas detector 15. [

Of the above-mentioned piping, the gas supply system piping 18C1 is connected to the gas supply piping 18C1 from the four-way conversion valve 10 via the air pump 11, the gas extractor 3, the gas extractor 3 Through the filter 12 and the gas extraction system piping 18C2 installed in the four-way valve 10, and then returned to the four-way conversion valve 10 again.

The oil-dissolved gas mixture gas supply pipe 18D is a pipe for leading a mixed gas of nitrogen and dissolved gas in the air to the temperature controller 14 and the gas detector 15. [ The sample gas supply pipe 18E is a pipe for guiding the dissolved gas in the oil and the mixed gas of nitrogen and oxygen generated in the gas adjusting device 13 to the temperature controller 14 and the gas detector 15. [

Next, FIG. 2 shows the flow chart of the gas analysis on the gas in the gas analyzer installed in the input transformer, which is one embodiment of the present invention shown in FIG. In Fig. 2, the measuring operation is firstly carried out in the order of measurement preparation 101. Fig.

Next, the procedure of the dissolved gas extraction 102 is performed. The procedure of the nitrogen-oxygen mixed gas measurement 103 as the reference gas is performed in parallel with the sequence of the dissolved gas extraction 102 in the oil-dissolved state. Finally, the procedure of the sample gas measurement 104 is performed. The procedure of the gas concentration calculation 105 for calculating the concentration of each component gas based on the order of the nitrogen-oxygen mixed gas measurement 103 and the measurement results of the sample gas measurement 104 is carried out. Each measurement operation is repeated.

In detail, in the procedure of the measurement preparation 101, the four-way valve 10 is operated as shown in Fig. 1, and nitrogen is supplied from the nitrogen bomb 6 through the nitrogen supply pipe 18A to the four- . The supplied nitrogen flows from the gas supply line 18C1 to the gas extractor 3 via the four-way switching valve 10 from the nitrogen supply line 18A.

Nitrogen then flows down the gas extraction system piping 18C2 and the dissolved gas mixture gas supply piping 18D through the gas extractor 3 to supply the dissolved gas mixture from the nitrogen supply piping 18A to the dissolved gas supply piping 18D ) Are replaced with nitrogen.

Oxygen is supplied from the oxygen cylinder 7 through the oxygen supply pipe 18B to the gas regulator 13 and the supplied oxygen is mixed with the nitrogen gas by the gas regulator 13 to form nitrogen Oxygen mixed gas is generated.

Thereafter, the nitrogen-oxygen mixed gas of the reference gas generated in the gas regulating device 13 is sequentially delivered to the temperature regulator 14 and the gas detector 15 through the sample gas supply pipe 18E, Is replaced with the nitrogen-oxygen mixed gas of the reference gas.

Next, in the procedure of the dissolved gas extraction 102 in the oil state, the four-way valve 10 is operated as shown in Fig. The flow path A is a system which is closed by the gas supply system piping 18C1, the gas extraction system piping 18C2 and the gas extractor 3 by the conversion of the four-way conversion valve 10, 6 to the gas regulating device 13 via the nitrogen supply pipe 18A and the four-way valve 10 are formed.

The oxygen is supplied from the oxygen cylinder 7 through the oxygen supply pipe 18B to the gas regulator 13 so that nitrogen which is a reference gas obtained by mixing oxygen with nitrogen flowing in the flow path B from the gas regulator 13 And the nitrogen-oxygen mixed gas of the reference gas is supplied to the temperature controller 14 and the gas detector 15 through the sample gas supply pipe 18E.

In the flow path A, a gas extraction operation is performed. That is, as an operation of extracting the gas from the flow path A, the opening valve 4 provided in the gas extractor 3 is first opened and the oil feed pump 5A provided in the pipe 25A is actuated, The insulating oil (2) sealed in the transformer (1) is supplied to the gas extractor (3).

Next, the injection of the insulating oil 2 into the gas extractor 3 is completed, and at the same time, the opening valve 4 is closed and the air pump 11 provided in the gas supply system piping 18C1 forming the flow path A is operated The nitrogen in the flow path A is circulated and the dissolved gas dissolved in the insulating oil 2 injected into the gas extractor 3 is collected by bubbling.

Bubbling is a method of collecting a sample gas for sampling a gas on a liquid surface after equilibrium between dissolved gas in the liquid and gas on the liquid surface by sucking an inert gas such as nitrogen into the liquid in which the sample gas is dissolved in the closed system It says.

The use of nitrogen as the inert gas for bubbling is to prevent oxygen from mixing into the insulating oil. The insulating oil 2 obtained after collecting the dissolved gas from the insulating oil 2 enclosed in the transformer 1 is returned to the transformer 1 from the gas extractor 3 and reused. However, when oxygen is mixed into the insulating oil 2, The insulating oil 2 and the insulating paper may be deteriorated. For this reason, nitrogen or an inert gas such as helium or argon is used for bubbling.

When bubbling is performed, the correlation between the bubbling time and the gas concentration in the nitrogen of the inert gas circulating in the closed system is checked in advance, and a proper bubbling time is selected.

The relationship between the concentration of the dissolved gas in the insulating oil 2 and the concentration of the gas extracted as the sample gas by bubbling differs depending on the gas component. Therefore, the correlation between the amount of dissolved gas in insulating oil and the amount of gas extracted by bubbling is obtained in advance.

Next, in the procedure of the nitrogen-oxygen mixed gas measurement step 103 as the reference gas, the gas detector 15 measures the nitrogen-oxygen mixed gas which becomes the reference gas through the flow path B formed by the conversion operation of the four- .

That is, nitrogen is supplied from the nitrogen bomb 6 to the gas regulating device 13 through the nitrogen supply pipe 18A and the four-way valve 10, and oxygen is supplied from the oxygen bomb 7 to the oxygen supply pipe 18B (20% oxygen and 80% nitrogen) of the reference gas, which is adjusted by the gas adjusting device 13, to the sample gas supply pipe 18E, , And supplies it to the gas detector (15) via the temperature regulator (14).

When the detection output of the reference gas detected by the semiconductor sensors S1-S7 provided in the gas detector 15 is stable, the detected output is input to the computer 16 as the sensor output for the nitrogen-oxygen mixed gas as the reference gas .

4, the four-way valve 10 is converted and nitrogen is supplied from the nitrogen bomb 6 to the nitrogen supply pipe 18A, the four-way conversion valve 10, and the gas supply Is supplied to the gas extractor 3 through the system piping 18C1 and the supplied nitrogen is supplied from the gas extractor 3 through the gas extracting system piping 18C2 and the dissolved gas mixed gas supply piping 18D in the gas regulating apparatus (13).

Through these operations, the dissolved gas mixture in the oil collected in the flow path A is pushed out by the nitrogen supplied from the nitrogen bomb 6 and guided to the gas regulating device 13. In the derived dissolved gas mixture, the gas supplied from the oxygen cylinder 7 through the oxygen supply pipe 18B is added in the gas regulator 13 to generate the sample gas.

Then, the sample gas generated in the gas adjusting device 13 is supplied to the gas detector 15 to detect the component concentration of the sample gas. The generation of the sample gas by adding oxygen to the dissolved gas mixture in the gas in the gas regulating device 13 means that oxygen is required for the measurement of the sample gas by the semiconductor sensors S1 to S7 provided in the gas detector 15 Because.

The gas supplied to the semiconductor sensors S1-S7 provided in the gas detector 15 is converted into the sample gas from the nitrogen-oxygen mixed gas of the reference gas so that the sensor output of the sample gas detected by the semiconductor sensors S1-S7 is supplied The gas is largely changed before and after the conversion. These sensor outputs are input to the computer 16 as sensor outputs of the semiconductor sensors S1-S7 for the sample gas where the sensor output is substantially constantly stable after the sensor output changes.

After the sample gas is measured by the semiconductor sensors S1 to S7 of the gas detector 15, nitrogen is supplied from the nitrogen bomb 6 to the gas extractor 3 while the oil feed pump 5B installed in the pipe 25B is operated, And the insulating oil 2 supplied to the gas extractor 3 is returned to the inflow transformer 1. [ These series of operations are automatically performed by receiving an instruction from the computer 16.

5 is a diagram schematically showing the sensor output of the gas detected by the semiconductor sensors S1-S7 provided in the gas detector 15. The horizontal axis indicates the time t and the vertical axis indicates the sensor output of the semiconductor sensors S1- (R) of the sensor output to be detected, and the sensor output is indicated by a curve in the figure.

In FIG. 5, the measurement period from time t = t0 to t = t1 shows the sensor output when measuring the nitrogen gas mixture gas (20% oxygen and 80% nitrogen) as the reference gas.

The measurement period from time t = t1 to t = t2 represents the sensor output when the sample gas is being measured, and the measurement period from time t = t2 to t = t3 is the time when the nitrogen- The sensor output when measuring is shown.

First, in the measurement period from time t = t0 to t = t1, the electrical resistance R, which is the sensor output of the reference gas at time t = t1, indicates R0. The reason why the sensor output is gradually changed over time t = t0 to t = t1 is because the sensor output is drifting.

The measurement period from time t = t1 to t = t2 shows the sensor output when measuring the sample gas supplied from the reference gas by the conversion operation of the four-way valve 10. By starting and supplying the sample gas at the time t = t1, the sensor output sharply decreases, and then the change in the sensor output gradually becomes gentle, and the sensor output becomes stable at time t = t2.

The electrical resistance R, which is the sensor output of the sample gas at time t = t2, represents R1.

The measurement period from time t = t2 to t = t3 is a time period during which the supply of the reference gas from the sample gas to the reference gas is changed by the conversion operation of the four-way valve 10 to measure the sensor output when the nitrogen- Respectively. By starting and measuring the supply of the nitrogen-oxygen mixed gas of the reference gas at time t = t2, the sensor output sharply increases and gradually changes in the sensor output become gentle, and the sensor output becomes stable at time t = t3.

The electrical resistance R, which is the sensor output of the reference gas at time t = t3, represents R2. The sensor output from the time t = t3 to the time t = t4 shows a state where the sensor output is stable and not changed.

Here, the electrical resistance R0 of the sensor output by the semiconductor sensor is previously detected with respect to the nitrogen-oxygen mixed gas of the reference gas and registered in the computer 16. As for the sample gas, for example, RC01 which is the electrical resistance R1 of the sensor output by the semiconductor sensor at a specific concentration, for example, a gas concentration of 10 ppm with respect to the gas of carbon monoxide, And registers it in the computer 16. [ Similarly, the value of the electrical resistance R of the sensor output by the semiconductor sensor in the case of hydrogen, acetylene, ethylene, methane, and ethane, which are other gases to be detected, Respectively.

As described above, by measuring the reference gas and the sample gas by the semiconductor sensors S1 to S7 provided in the gas detector 15, the electric resistance R0 of the sensor output with respect to the reference gas, (R0 / R1) of the sensor output with respect to the gas of the carbon monoxide is calculated by measuring the electrical resistance (R1) of the sensor output with respect to the gas such as carbon monoxide.

Then, the ratio (R0 / RC01) of the sensor output based on the electric resistance RC01 of the gas of carbon monoxide of 10 ppm gas concentration detected in advance in the computer 16 is calculated and the ratio (R0 / R1) The gas concentration of the carbon monoxide in the sample gas can be accurately calculated.

By measuring the reference gas and the sample gas by the same method using the semiconductor sensors S1 to S7 provided in the gas detector 15, the hydrogen gas, acetylene, ethylene, methane, and ethane, which are other gases to be detected in the sample gas, The gas concentration of the specific component in the sample gas can be accurately calculated by calculating and comparing the ratio (R0 / R1) of the sensor output described above.

In order to prevent erroneous measurement by the drift, the measured value of the nitrogen-oxygen mixed gas as the reference gas is R0, which is the sensor output of the reference gas at the time t = t1 immediately before conversion into the sample gas, The sensor output R2 of the reference gas at the time t = t3 when the output after the conversion into the oxygen mixed gas is stable is used.

The measurement value of the sample gas can be prevented from being erroneously measured by the use of the sensor output (R1) of the sample gas at the time t = t2 immediately before the conversion into the nitrogen-oxygen mixed gas. In this case, the ratio of the sensor output to be calculated is not R0 / R1 but the ratio of output R2 / R1.

Assuming that the nitrogen-oxygen mixed gas of the reference gas is continuously measured after the time t = t1, the sensor output R0 'for the nitrogen-oxygen mixed gas at time t = t2 is estimated, The output corresponding to the gas concentration may be calculated as the sensor output R0 '/ R1.

6 is a graph showing the relationship between the sensor output of the reference gas detected by the semiconductor sensors S1-S7 provided in the gas detector 15 in the gas analyzer of the first embodiment of the present invention shown in Figs. 1 to 5 and the sample gas Which is input to the computer 16 to calculate the gas concentration of each gas to be detected contained in the sample gas.

As described above, the reference gas and the electrical resistance R, which is the sensor output of the semiconductor sensors (S1 to S7), are obtained in advance for the various gases to be detected at the specific concentration in correspondence to the reference gas and various gases to be detected Leave.

6, the concentration of each gas component contained in the sample gas, which is included in the sample gas, is calculated based on the output detected by the plurality of semiconductor sensors S1-S7 having different characteristics with respect to the sample gas and the nitrogen- Are calculated by the arithmetic unit 201 to arithmetic unit 205 provided in the computer 16. [ The semiconductor sensor to be used preferably has a small number of kinds of gases to be reacted.

As a procedure for calculating the gas concentration of various gases to be measured contained in the sample gas, first, from among the semiconductor sensors (S1 to S7), a gas component capable of obtaining the concentration by the output detected by a small number of semiconductor sensors, .

Next, the output of the remaining semiconductor sensor is used to calculate the unknown gas concentration by substituting the obtained concentration of the gas component into the calculation equation showing the relationship between the reaction characteristic and the gas concentration. By repeating this calculation, the unknown gas concentration is obtained, and the number of unknown gas concentrations is sequentially reduced by calculation, and finally, the concentration of all the gas components is calculated.

In this embodiment, the concentration is calculated in the order of hydrogen, carbon monoxide, acetylene, ethylene, methane and ethane.

It is possible to reduce the calculation amount of the gas concentration calculation by first obtaining the gas concentration from the gas component capable of obtaining the concentration by the small number of semiconductor sensors among the semiconductor sensors S1 to S7 and to improve the detection accuracy with respect to the gas to be detected do.

6, the concentration of hydrogen, carbon monoxide, acetylene, ethylene, methane, and ethane contained in the sample gas calculated by the arithmetic units 201 to 205 in the calculation sequence for calculating the gas concentration, May be input to the monitoring device 210 and monitored at all times.

In this case, if the permissible value of each gas concentration to be detected is inputted from the setting device 220 to the monitoring device 210, the monitoring device 210 monitors the gas concentrations of the objects to be detected exceeding these allowable values, . Further, the display device 230 can display the gas concentration and the alarm display of the detection object from the monitoring device 210. [

Next, a method of calculating the gas concentration will be described for the case where linearity is established between the gas concentration of the detection object and the detection characteristic of the semiconductor sensor in the present embodiment.

The calculation of the gas concentration in the case of detecting the nitrogen-oxygen mixed gas and the sample gas which are the reference gas will be described with reference to FIG. First, when the concentration (NH2) of hydrogen from the sample gas is obtained, the calibration curve (the concentration of the detected concentration and the electrical resistance of the sensor output) of the output G1 detected by the sensor S1 and the concentration NH2 Is expressed by Equation 1, which is a function expression registered in the arithmetic unit 201.

Here, A11 and B11 are integers obtained by measuring a mixture gas of hydrogen and air by the sensor S1.

The hydrogen concentration NH2 is calculated by substituting the output detected by the sensor S1 into G1 in Equation 1 of the computing unit 201. [

Next, when the concentration of carbon monoxide (NC0) is obtained from the sample gas, the calibration curve for the output G2, the hydrogen concentration NH2 and the carbon monoxide concentration NC0 detected by the sensor S2 is supplied to the arithmetic unit 202 The registered function formula is expressed by Equation (2).

Here, A21, A22, B21 and B22 are integers obtained by measuring a mixed gas of hydrogen and air and a mixed gas of carbon monoxide and air by the sensor S2.

The output of the sensor S2 is substituted into G2 in Equation (2) of the computing unit 202, and the hydrogen concentration obtained first is substituted into NH2 to obtain the carbon monoxide concentration NCO.

Next, when the concentration of acetylene (NC2H2) is obtained from the sample gas, the calibration curve for the output C3, the concentration of carbon monoxide (NC0), and the concentration of acetylene (NC2H2) (3) " (3) "

Here, A31, A32, B31 and B32 are integers obtained by measuring a mixed gas of carbon monoxide and air and a mixed gas of acetylene and air by the sensor S3. The output of the sensor S3 is substituted into NC0 in the equation G3, and the acetylene concentration NC2H2 obtained by substituting the obtained carbon monoxide concentration into NC0 is calculated.

The calibration curve for the output G4 of the sensor S4, the concentration of acetylene (NC2H2) and the concentration of ethylene (NC2H4) in the case of obtaining the concentration of ethylene from the sample gas (NC2H4) Lt; / RTI >

Here, A41, A42, B41, and B42 are constants obtained by measuring a mixed gas of acetylene and air and a mixed gas of ethylene and air by the sensor S4.

The output of the sensor S4 is substituted into G2 in equation (4) of the calculator 204, the acetylene concentration obtained first is substituted into NC2H2, and the ethylene concentration NC2H2 is calculated.

Next, when the methane concentration (NCH4) and the ethane concentration (NC2H6) are obtained from the sample gas, the output G5 of the sensor S5, the hydrogen concentration NH2, the carbon monoxide concentration NC0, The calibration curve for the concentration of ethylene (NC2H2), the concentration of ethylene (NC2H4), the concentration of methane (NCH4), and the concentration of ethane (NC2H6) is expressed by Equation 5, which is a function expression registered in the computing device 205.

In this case, a mixture gas of hydrogen and air, a mixture gas of carbon monoxide and air, a mixture of acetylene and air, a mixture of hydrogen and air, a mixture of hydrogen and air, Gas, a mixed gas of ethylene and air, a mixed gas of methane and air, and a mixed gas of ethane and air.

When the methane concentration (NCH4) and the ethane concentration (NC2H6) are obtained from the sample gas, the output G6 of the sensor S6, the hydrogen concentration NH2, the carbon monoxide concentration NC0, The calibration curve for the concentration of ethylene (NC2H2), the concentration of ethylene (NC2H4), the concentration of methane (NCH4), and the concentration of ethane (NC2H6) are shown in Equation 6, which is another function formula registered in the computing device 205.

In this case, the gas mixture of hydrogen and air, the mixed gas of carbon monoxide and air, and the gas of acetylene and air are mixed by the sensor S6, A61, A62, A63, A64, A65, A66, B61, B62, B63, B64, B65, Mixed gas, a mixed gas of ethylene and air, a mixed gas of methane and air, and a mixed gas of ethane and air.

The output of the sensor S5 and the output of the sensor S6 are respectively multiplied by G5 in Equation 5 of the arithmetic unit 205 and G6 in Equation 6 of the arithmetic unit 205 and NH2 and NC0 of Equations 5 and 6 , NC2H2, and NC2H4 are substituted into the gas concentration, and the simultaneous equations are obtained. NCH4, and NC2H6, the concentrations of methane and ethane are calculated.

Thus, the concentrations of hydrogen, carbon monoxide, methane, ethane, ethylene, and acetylene are calculated.

According to the embodiments of the present invention, it is possible to provide a gas analysis apparatus for a gas in oil, a transformer equipped with a gas analyzer for gas analysis, and a method for analysis of gas in the gas, which enables detection of concentration of various gases with high reproducibility of detection using a versatile semiconductor sensor It becomes possible to realize it.

(Example 2)

As a second embodiment of the present invention, Fig. 7 shows the construction of a gas analyzer in insulating oil, which is another embodiment of the present invention, and is a portable gas analyzer of gas oil type corresponding to an apparatus in which insulating oil is enclosed therein. The gas analyzing apparatus in the insulating oil of this embodiment analyzes the gas in the insulating oil against hydrogen and acetylene.

Since the insulating oil gas analyzer 30 of the present embodiment shown in Fig. 7 has the same basic structure as the first embodiment shown in Figs. 1, 3 and 4, the description of common components is omitted , The difference will be described.

In Fig. 7, the viscous oil gas analyzer of the present invention is filled with insulating oil 2 inside the apparatus to be analyzed (not shown), which requires analysis of the gas in the gas. The gas analyzer 30 is provided with an insulating oil injector 501 and a gas extractor 3 communicating with the insulating oil injector 501 through a pipe 25C having a valve 503, 3), the gas generated in the oil of the insulating oil 2 collected by the insulating oil injector 501 is extracted by the bubbling method.

This insulated oil injector 501 takes the insulating oil 2 sealed in a device to be analyzed of the gas in the form of a cylinder and supplies the collected insulating oil 2 to the gas extractor 3 by a predetermined amount. An oil discharge port 504 having a valve 502 is provided at the bottom of the gas extractor 3 to discharge the insulating oil 2 after extracting the oil gas to be analyzed.

An air purifier 31 is provided for purifying the clean air which is a reference gas for removing the organic gas from the air introduced in the air and adjusting the humidity to purify the air, To the conversion valve (10).

The air is supplied from the air purifying device 31 to the gas extractor 3 through the air supply pipe 18F and the gas supply system pipe 18C1 as purified gas as an inert gas, . Instead of the air purifier 31, a pneumatic cylinder storing clean air may be used.

The four-way selector valve 10 is connected to the gas extracting system piping 18C2 and the gas extracting system piping 18C2 for extracting the dissolved gas mixture in the oil generated in the oil of the insulating oil 2 from the gas extractor 3 And is connected to a dissolved gas mixed gas supply pipe 18D for leading the dissolved gas in the air to the gas regulating device 13.

Then, by converting the four-way valve 10, the dissolved gas mixture in the air is supplied from the gas extractor 3 through the gas extracting system piping 18C2 and the dissolved gas mixed gas supply piping 18D to the temperature regulator 14), and a flow path for supplying the gas to the gas detector 15 is formed by adjusting the temperature to a predetermined temperature.

An air pump 11 is provided in the gas supply system piping 18C1 and bubbling is performed in the same manner as in the first embodiment by operating the air pump 11. [

When the filter 12 is installed in the gas extractor 3 and the dissolved gas mixture in the oil generated in the oil of the insulating oil 2 is led from the gas extractor 3 to the four-way valve 10, And the insulating oil mixed in with the gas is removed.

A semiconductor sensor composed of a metal oxide such as tin oxide, tungsten oxide, or zirconium oxide is provided in the gas detector 15. By this semiconductor sensor, a mixed gas of nitrogen and oxygen as a sample gas, And outputs the measured values thereof to the computer 16 as an output signal.

The computer 16 calculates the gas component concentration of the dissolved gas in the oil based on the output signal from the semiconductor sensor provided in the gas detector 15 and displays the gas component concentration or the like of the calculated dissolved gas in the monitor on a monitor or the like . The computer 16 is configured to instruct the respective elements to turn on and off the pumped flow constituting the gas analysis apparatus installed in the embodiment of the present invention, and to perform the conversion operation and the opening and closing operation of the conversion valve and the exhaust valve flow.

Next, Fig. 8 shows a gas analysis apparatus of a portable type insulating oil according to a second embodiment of the present invention shown in Fig. 7, in which the gas analysis in the insulating oil is performed. In Fig. 8, the measuring operation is firstly carried out in the order of measurement preparation 111. Fig.

Next, the oil dissolved gas extraction 112 is performed in order. The procedure of the air gas measurement 113 as the reference gas is performed in parallel with the sequence of the dissolved gas extraction 112 in the oil. And finally the sample gas measurement 114 is performed. The procedure of the gas concentration calculation 115 for calculating the concentration of each component gas based on the measurement results of the order of the air gas measurement 113 and the order of the sample gas measurement 104 is performed. Each measurement operation is repeated.

In detail, in the procedure of the preparation for measurement 111, the four-way valve 10 is operated as shown in FIG. 7 to supply clean air from the air cleaning device 31 through the air supply pipe 18F to the four- 10).

The supplied clean air flows from the air supply pipe 18F to the gas extractor 3 via the four-way conversion valve 10 from the gas supply system pipe 18C1. Thereafter, the clean air flows down the gas extracting system piping 18C2 and the dissolved gas mixture gas supply piping 18D in the air via the gas extractor 3 to be supplied from the air supply piping 18F to the dissolved gas mixture supply pipe 18D are replaced with clean air.

Next, in the order of the dissolved gas extraction 112 in the oil state, the four-way valve 10 is operated as shown in Fig. By the conversion of the four-way conversion valve 10, a flow path A as a system closed by the gas supply system piping 18C1, the gas extraction system piping 18C2 and the gas extractor 3 is formed.

It is also possible to supply clean air from the air purifying device 31 to the temperature regulator 14 via the air supply pipe 18F and the four-way valve 10 by the conversion of the four- . The clean air that flows the flow path B through the temperature regulator 14 is adjusted to a set temperature to generate clean air as a reference gas and supplies the clean air of the reference gas to the gas detector 15. [

In the flow path A, a gas extraction operation is performed. The opening valve 4 provided in the gas extractor 3 is opened and the insulating oil 2 is injected into the gas extractor 3 with the insulating oil injector 201 do.

Next, at the same time that the injection of the insulating oil 2 into the gas extractor 3 is completed, the opening valve 4 is closed and the air pump 11 provided in the gas supply system piping 18C1 forming the flow path A is operated , The clean air in the flow path A is circulated and the dissolved gas dissolved in the insulating oil 2 injected into the gas extracting device 3 by bubbling is extracted and collected into clean air to produce a sample gas.

Next, in the procedure of the air gas measurement 113 as the reference gas, the air is supplied from the air purifying device 31 to the temperature controller 14 through the flow path B formed by the conversion operation of the four-way conversion valve 10, The gas detector 15 measures the clean air as the reference gas.

That is, clean air is supplied from the air purifying device 31 to the temperature regulator 14 through the air supply pipe 18F and the four-way valve 10, and the reference gas adjusted to the set temperature by the temperature regulator 14 And supplies the clean air to the gas detector 15. The detected output of the reference gas detected by the semiconductor sensor S1-S7 provided in the gas detector 15 is stable, and the detected output is sent to the computer 16 as a sensor output for the clean air as the reference gas .

10, the four-way switching valve 10 is changed to connect the air supply pipe 18F, the four-way switching valve 10, and the gas supply system Is supplied to the gas extractor 3 through the pipe 18C1 and the supplied clean air is supplied from the gas extractor 3 through the gas extracting system piping 18C2 and the dissolved gas mixed gas supply piping 18D to the temperature regulator 14).

Through these operations, the dissolved gas mixture in the oil collected in the flow path A is pushed out by the clean air supplied from the purifier 31 and is led to the temperature regulator 14 via the four-way valve 10.

The derived dissolved gas mixture is adjusted to the set temperature by the temperature controller 14 to generate the sample gas. Then, the generated sample gas is supplied to the gas detector 15 to detect the component concentration of the sample gas.

The sensor output of the sample gas detected by the semiconductor sensors S1, S3, S4 by converting the gas supplied to the semiconductor sensors S1, S3, S4 provided in the gas detector 15 from the air of the reference gas into the sample gas It is largely changed before and after the conversion of the supplied gas.

These sensor outputs are input to the computer 16 as sensor outputs of the semiconductor sensors S1, S3 and S4 for the sample gas where the sensor output is substantially constantly stable after the change of the sensor output.

The sensor outputs for the reference gas and the sample gas detected by the semiconductor sensors S1, S3, and S4 provided in the gas detector 15 are the same as those in FIG.

The electrical resistance R0 of the sensor output with respect to these reference gases and the electrical resistance R1 of the sensor output with respect to the gas to be measured in the sample gas are measured and the computer 16 calculates the ratio (R0 / R1 ), The gas concentration of the gas to be measured in the sample gas can be accurately calculated.

Fig. 11 is a graph showing the relationship between the reference gas detected by the semiconductor sensors S1, S3, and S4 installed in the gas detector 15 in the insulating gas analyzer of the second embodiment of the present invention shown in Figs. Which is input to the computer 16 as a sensor output and calculates the gas concentration of each gas to be detected contained in the sample gas.

As in the case of the first embodiment, in advance of the reference gas and various kinds of gases to be detected, electric resistance (" R) is obtained.

11, the concentration of each gas component contained in the sample gas to be measured is calculated based on the output detected by the plurality of semiconductor sensors S1, S3, and S4 having different characteristics with respect to the clean air and the sample gas, Is calculated by an arithmetic unit (301), an arithmetic unit (303), and an arithmetic unit (304) provided in the computer (16). The semiconductor sensor to be used preferably has a small number of kinds of gases to be reacted.

As a procedure for calculating the gas concentration of various gases to be measured contained in the sample gas, a gas component capable of obtaining the concentration by the output detected by a small number of semiconductor sensors among the semiconductor sensors (S1, S3, S4) The gas concentration is obtained.

Next, the output detected by the remaining semiconductor sensors is used to calculate the unknown gas concentration by substituting the calculated concentration of the gas component in the calculation equation showing the relationship between the reaction characteristic and the gas concentration. By repeating this calculation, the unknown gas concentration is obtained, and the number of unknown gas concentrations is sequentially reduced by calculation, and finally, the concentration of all the gas components is calculated. In this embodiment, the concentration is calculated in the order hydrogen, acetylene, and ethylene.

It is possible to reduce the calculation amount of the gas concentration calculation as the gas concentration is first obtained from the gas components which can be obtained by the small number of semiconductor sensors among the semiconductor sensors S1, S3 and S4, The detection accuracy for the detection is also improved.

11. In the calculation sequence for calculating the gas concentration shown in Fig. 11, the hydrogen gas, the acetylene, and the ethylene gas contained in the sample gas calculated by the calculator 301, the calculator 303 and the calculator 304 The calculated value of the gas concentration can be input to the monitoring device 310 and monitored at all times.

In this case, if the permissible value of each gas concentration to be detected is input from the setting device 320 to the monitoring device 310, the monitoring device 310 notifies the alarm about the concentration of each gas that exceeds the allowable value It becomes possible to put out. In addition, the display device 330 can display the gas concentration and the alarm display of the detection object from the monitoring device 310.

Next, a method of calculating the gas concentration will be described for the case where linearity is established between the gas concentration of the detection object and the detection characteristic of the semiconductor sensor in the present embodiment.

The calculation of the gas concentration in the case of detecting the clean air and the sample gas as the reference gas will be described with reference to Fig. First, when the hydrogen concentration (NH2) is obtained from the sample gas, the calibration curve (the concentration of the detected concentration and the electrical resistance of the sensor output) of the output G1 detected by the sensor S1 and the concentration NH2 Is expressed by the functional expression argument 7 registered in the operator 301.

Here, A11 and Bl1 are constants obtained by measuring a mixed gas of hydrogen and air by the sensor S1.

The hydrogen concentration NH2 is calculated by substituting the output detected by the sensor S1 into G1 in the equation (7) of the computing unit 301. [

Next, when the concentration of acetylene (NC2H2) is obtained from the sample gas, a calibration curve for the output C3, the concentration of acetylene (NC2H2) and the concentration of ethylene (NC2H4) detected by the sensor S3 is registered in the computing unit 303 (8) < / RTI >

Here, A31, A32, B31 and B32 are integers obtained by measuring a mixed gas of acetylene and air and a mixed gas of ethylene and air by the sensor S3.

The calibration curve for the output G4 of the sensor S4, the concentration of acetylene (NC2H2) and the concentration of ethylene (NC2H4) is expressed by Equation 9, which is a functional expression registered in the computing unit 304.

Here, A41, A42, B41, and B42 are constants obtained by measuring a mixed gas of acetylene and air and a mixed gas of ethylene and air by the sensor S4.

The outputs of the sensor S3 and the sensor S4 are substituted into G3 in Equation 8 and G4 in Equation 9, which are the functional formulas of the arithmetic unit 303, respectively, to form a simultaneous equations. NCH4, and NC2H6, the concentrations of ethylene and acetylene are calculated. As a result, the concentrations of hydrogen and acetylene are obtained by calculation.

(Example 3)

A monitoring system of an insulated inflow transformer for monitoring a plurality of inflow transformers by collectively monitoring a plurality of inflow transformers and inspecting gas in insulating oil sealed in the inflow inflow transformer will be described as a third embodiment of the present invention.

12 shows an embodiment of a surveillance system in a case where a plurality of insulated inflow transformers 1 are collectively monitored. The gas analyzing apparatuses 401, 402, 403 and the central monitoring apparatus 420 with communication means can communicate with each other via the telephone line 430, the cellular phone line 450 and / or the radio 440.

Each of the gas analyzing apparatuses 401, 402 and 403 with the communication device is provided with an inflow transformer 1 and an inert gas for collecting and analyzing various gases contained in the insulating oil 2 enclosed in the inflow transformer 1 A plurality of sets of monitoring devices 210 and 310 for monitoring the various gases detected by the gas analysis devices 20 and 30 are provided.

Then, the gas analyzing apparatuses 401, 402, and 403 connected to the communication devices are connected to the LAN and collected in the HUB. The data of concentrations and monitoring results of various gases analyzed and collected from the gas analyzers 20 and 30 To the market value (420).

The data to be transmitted need not always be transmitted and received, and data may be transmitted and received periodically. When the central monitoring apparatus 420 wishes to confirm the reproducibility of the transmitted data or to enhance the monitoring by receiving the diagnosis result by monitoring, the central monitoring apparatus 420 performs remeasurement or shortens the measurement interval, can do.

If the result of the diagnosis is abnormal, measures such as more precise gas analysis or stop of the inflow transformer can be taken. In addition, the central monitoring device 420 is capable of confirming the operation of the gas analysis apparatuses 401, 402, 403 with communication means and confirming the remaining amount of air in the air cylinder.

This system is effective for collective surveillance of inflow transformers installed at remote sites or inflowing transformers that are dotted. The system for directly connecting the gas analyzing apparatuses 401, 402, 403 with the communication means and the central monitoring apparatus 420 to the LAN or the gas analysis apparatuses 401, 402, 403 with the individual communication means, A system for directly communicating with the monitoring device 420 through a telephone line or a cellular phone line may be constructed.

In addition, the central monitoring device 420 may receive the detection output of each semiconductor sensor for detecting the gas concentration of various gases, and the central monitoring device 420 may calculate the gas concentration of various gases.

According to the embodiment of the present invention, it is also possible to realize a gas analyzing apparatus for insulated oil and a method for analyzing gas in oil, which enables detection of concentration of various gases having high reproducibility of detection using a versatile semiconductor sensor.

(Example 4)

Next, the membrane permeation system provided in the insulated inflow transformer according to the fourth embodiment of the present invention can be applied to a gas analyzer in insulating oil instead of the gas extractor applied in the first embodiment. In this connection method, the gas supply system piping 18C1 is connected to the carrier gas supply port described later, and the gas extraction system piping 18C2 is connected to the carrier gas extraction port described later. Hereinafter, a membrane-permeable insulated oil gas analyzer installed in an insulated inflow transformer according to a fourth embodiment of the present invention will be described with reference to the drawings.

In the gas permeation type insulated oil gas analyzer of the membrane permeation type, the time t at which the concentration of the decomposition product gas in the gas storage chamber reaches the equilibrium state is represented by V, the thickness of the gas storage chamber is d, the area of the permeable membrane is A And can be expressed by the following equation (10). P is the permeation coefficient, and C is an integer.

According to the expression (10), the time (t) to reach equilibrium can be reduced by reducing the thickness d of the gas permeable membrane and the volume V of the gas storage chamber and increasing the area A of the gas permeable membrane.

In order to reduce the time t until the equilibrium arrives, it is preferable to reduce the thickness d of the permeable membrane. However, the gas permeable membrane is often installed in the discharge port of the inflow transformer, and pressure of about 0.2 MPa is applied to the installation position by the insulating oil. Therefore, if the thickness of the gas permeable membrane is too small, it is broken.

When the gas permeable membrane having the thickness d1 is used for the groove-shaped gas storage chamber having the radius of the outer periphery of R1 + r and the inner radius R1-r hollow, the pressure applied to the gas permeable membrane is denoted by p And the shear stress? 1 applied around the gas permeable membrane can be expressed by the following equation (11).

The relationship between the groove width 2r and the thickness d of the gas permeable membrane is determined by the following expression (12), assuming that the pressure p applied to the gas permeable membrane is 0.2 MPa and the allowable shear stress is?

From the above, in the present invention, the relationship between the allowable maximum shear stress (τ [MPa]) of the material of the gas permeable membrane and the thickness (d) of the gas permeable film is expressed by Equation (12) The thickness of the gas permeable membrane is preferably reduced.

In order to increase the precision of the gas measurement, it is preferable that the sample gas, which becomes the sample gas for analysis stored in the gas storage chamber, can be supplied to the gas measuring instrument without being diluted with nitrogen gas or a carrier gas which is an inert gas.

Therefore, in the present invention, it is proposed to make the cross-sectional area of the groove of the gas storage chamber equal to or smaller than the cross-sectional area of the carrier gas inlet. As a result, the gas in the gas storage chamber can be prevented from being diluted by the carrier gas.

It is possible to perform the calibration of the gas in the gas storage chamber by making the volume of the groove serving as the gas storage chamber equal to the volume of the sample gas necessary for measuring the gas in the gas measuring instrument. So that it can be supplied to the measuring instrument. In this case, it is preferable that the carrier gas supply port and the carrier gas extraction port are provided at the end of the groove-shaped gas storage chamber so as to be able to supply a specified amount of sample gas.

In the gas analysis apparatus of the present invention, it is preferable to provide an oil flow means for imparting a flow by stirring or vibrating oil. The decomposition product gas contained in the oil permeates the gas storage chamber side, whereby the concentration of the decomposition product gas contained in the oil is locally lowered in the vicinity of the gas permeation membrane, and the gas permeation efficiency is lowered. By making the oil flow or agitating or vibrating, the concentration of the decomposition product gas in the oil can be made the same, and the gas permeation efficiency can be increased. Thus, the time t to reach the equilibrium can be reduced.

As the material of the gas permeable membrane, a polymer organic compound film and a polymer organic compound porous film can be used. Alternatively, a polymer organic compound film or a polymer organic compound porous film integrated with a porous plate, an apertured plate, or a wire net as a reinforcing material can be used.

The gas analyzer in insulating oil of the insulated inflow transformer of this embodiment will be described. 13 shows the structure of the gas sampling unit in the insulating oil gas analyzer. The gas collecting portion 1100 corresponding to the gas extractor 3 of the embodiment shown in FIG. 13 has a groove attaching flange 1101, a gas permeable film 1102, a groove shaped gas storage chamber 1103, a carrier gas supply port 1104 ), A carrier gas extraction port 1105, a valve 1106a, and a valve 1106b.

The drain port 1201 is provided on the side of the inlet transformer together with the drain valve 1202. The drain port 1201 and the drain valve 1202 are used as a discharge port for the insulating oil which is originally unnecessary but are used as an installation portion of the gas sampling section 1100 in this embodiment. At the time of collecting the gas, the inlet valve 1202 is opened, and the gas permeable membrane 1102 is in intimate contact with the insulating oil 1203.

The groove attachment flange 1101 is secured to the inflow port 1201 to equip the inflow transformer 1200 with the gas collection portion 1100 and sandwich the gas permeable film 1102 around the groove.

The gas permeable film 1102 seals the insulating oil 1203 in the outer container of the inflow transformer or the inflow transformer and transmits the decomposition product gas to the groove shaped gas storage chamber 1103 side. An ethylene tetrafluoride / perfluoroalkyl vinyl ether copolymer film having a thickness of 0.1 mm was used as the material of the gas permeable membrane 1102. Examples of the material suitable for the gas permeable membrane 1102 include a tetrafluoroethylene copolymer film, an organic polymer compound membrane such as polyethylene and fluorine rubber, a porous organic polymer compound membrane, an organic polymer compound coated on a porous plate, And a combination of a reinforcing material and an organic polymer compound film.

The groove-shaped gas storage chamber 1103 collects and stores the sample gas into a space formed by the groove-shaped concave portion formed in the groove attachment flange 1101 and the gas permeable film 1102. The groove-shaped gas storage chamber 1103 serves as a channel for the carrier gas when the sample gas is supplied.

The carrier gas supply port 1104 is connected to one end of the trench type gas storage chamber 1103 and is an inlet for introducing the carrier gas into the trench type gas storage chamber 1103.

The area of the cross section of the groove-shaped gas storage chamber 1103 perpendicular to the stream direction of the carrier gas is made smaller than the area of the cross section of the carrier gas supply port 1104 perpendicular to the stream direction of the carrier gas.

The carrier gas extraction port 1105 is an outlet of the sample gas collected through the other end of the groove-shaped gas storage chamber 1103 and collected and stored therein and the carrier gas introduced from the carrier gas supply port 1104.

The valve 1106a and the valve 1106b are closed at the time of sampling and storage of the sample gas, and are opened when the gas storage chamber is replaced by the carrier gas.

The packing 1107 is inserted into the fastening portion of the groove attaching flange 1101 and the gas permeable membrane 1102 and the fastening portion of the evacuation port 1201 and the gas permeable membrane 1102 to supply the insulating oil to the inflow transformer or the outer vessel Lt; / RTI >

14 shows the structure of a groove attachment flange in a gas analysis apparatus for a gas. Here, the groove-shaped gas storage chamber 1103 has a linear groove shape. Sectional area of the cross-section perpendicular to the stream direction of the carrier gas in the groove-shaped gas storage chamber 103 in order to prevent the flow of the carrier gas during the supply of the carrier gas or to prevent the sample gas from mixing with the carrier gas, Is preferably equal to or smaller than the cross sectional area of the supply port.

Examples of operation of the gas analysis include preparation of sample gas, sampling and storage of sample gas, preparation of measurement, sample gas supply, and sample gas measurement.

First, as a preparation for sample gas sampling, the groove-shaped gas storage chamber 1103 is replaced with a carrier gas. The valves 1106a and 1106b are opened, and the carrier gas is supplied from the carrier gas supply unit.

Next, sample gas is collected and stored. When the groove-shaped gas storage chamber 1103 is replaced with a carrier gas, the valves 1106a and 1106b are closed. The decomposition product gas dissolved in the insulating oil permeates through the gas permeable membrane 1102 and is diffused into the groove-shaped gas storage chamber 1103. And waits until the gas concentration of the groove-shaped gas storage chamber 1103 and the concentration of decomposition product gas in the insulating oil reach equilibrium.

The time required for the gas concentration to reach equilibrium is measured and tested beforehand. In Equation (10), if the integer C is known, the time to reach equilibrium in Equation (10) may be estimated.

The measurement is then prepared.

And a carrier gas is supplied from the carrier gas supply unit to the gas measurement unit.

Further, the sample gas is supplied continuously. The valve 1106a and the valve 1106b are opened, and the carrier gas is supplied from the carrier gas supply unit to the gas measurement unit via the gas collection unit.

By replacing the inside of the groove shaped gas storage chamber 1103 with a carrier gas, the sample gas in the groove-shaped gas storage chamber 1103 is supplied to the gas measuring device, and the gas measuring part measures the type and concentration of the gas.

(Example 5)

In this embodiment, the case where sample gas is sampled, stored, calibrated, and supplied in the groove-shaped gas storage chamber 1103 will be described with reference to FIG. It is not necessary to provide a calibration pipe separately by calibrating the sample gas in the groove-shaped gas storage chamber 1103, and the volume of piping from the calibration pipe itself to the calibration pipe can be saved. As a result, the volume V of the gas storage chamber in Equation (10) can be made smaller, and the time t to reach equilibrium can be shortened.

In Fig. 14, the carrier gas supply port 1104 is cylindrical in radius r. The groove-shaped gas storage chamber 1103 is in the shape of a rectangular parallelepiped having a length L, a width 2r and a groove depth h, and both ends have a semi-cylindrical shape with a radius r and a depth h. Therefore, the volume of the groove-shaped gas storage chamber 1103 is 2rLh + pi r2h.

The volume of the groove shaped gas storage chamber 1103 becomes the volume of the supplied sample gas. Therefore, the volume of the groove-shaped gas storage chamber 1103 is made equal to the volume of the sample gas required for the measurement.

The cross-sectional area 2rh perpendicular to the stream direction of the carrier gas in the groove-shaped gas storage chamber 1103 is 10 mm 2 and is smaller than 19.6 mm 2, which is the cross-sectional area πr 2 of the carrier gas supply port 1104.

As a procedure of the analysis of the gas in the gas, first, the groove-shaped gas storage chamber 1103 was replaced with the carrier gas as a preparation for gas sampling. The valve 1106a and the valve 1106b were opened to supply the carrier gas from the carrier gas supply unit.

Next, sample gas was collected and stored. When the groove-shaped gas storage chamber 1103 is replaced with a carrier gas, the valve 1106a and the valve 1106b are closed and held. The decomposition product gas dissolved in the insulating oil permeates through the gas permeable membrane 1102 and is diffused into the trench type gas storage chamber 1103. And waited until the gas concentration of the groove-shaped gas storage chamber 1103 reached equilibrium.

The time required for the gas concentration to reach equilibrium was determined by conducting a measurement test in advance and was 70 [h].

When a calibration tube not provided according to the present invention was separately provided, the time required for the gas concentration to reach equilibrium was 138 h.

Therefore, according to the present invention, the time required for gas sampling can be shortened to about one half.

Subsequently, measurement was prepared after the gas concentration reached equilibrium.

And a carrier gas is supplied from the carrier gas supply unit to the gas measurement unit.

Further, the sample gas was continuously supplied. The valve 1106a and the valve 1106b are opened, and the carrier gas is supplied from the carrier gas supply unit to the gas measurement unit via the gas collection unit.

Shaped gas storage chamber 1103 was replaced with a carrier gas, the sample gas in the groove-shaped gas storage chamber 1103 was supplied to the gas measuring instrument.

(Example 5)

In this embodiment, the case where the thickness of the gas-permeable membrane is reduced by adjusting the width of the groove-shaped gas storage chamber 1103 will be described. Fig. 15 shows the structure of a groove attachment flange in which the shape of the gas storage chamber is an arc shape. As an example of the present invention, when the gas-permeable membrane 1102 having a thickness d1 is used as the groove-shaped gas storage chamber 1103 in a cylindrical shape having an outer diameter R1 + r, an inner diameter R1-r, And a gas permeable membrane 1102 having a cylindrical shape with a radius R2 and height h and a thickness d2 are used as an example of a conventional method.

According to the present invention, it is assumed that the shear stress applied around the gas permeable membrane 1102 is uniform, and the shear stress? 1 applied around the gas permeable membrane 1102 is calculated by Equation (11) Is obtained.

When the allowable shear stress is?, The thickness d1 of the gas permeable film 1102 is determined by the following equation (13).

On the other hand, in the case of the conventional method, the shear stress t2 hanging around the gas permeable film 1102 is determined by the following equation (14).

When the allowable shear stress is?, The thickness d2 of the gas permeable film 1102 is determined by the following equation (15).

The ratio (d1 / d2) of the thickness of the film is expressed by Equation (16), and is determined by r and R2 irrespective of R1.

Further, since V = A · h, equation (10) can be expressed by the following equation (17).

The time t1 until reaching the equilibrium according to the present invention is expressed by Equation (18).

The time t2 until reaching the equilibrium by the conventional method is expressed by Equation (19).

Therefore, the ratio (t1 / t2) of the time until reaching the equilibrium is expressed by Equation (20) by Equations (16), (18) and (19), and is determined by r and R2.

When the area of the gas permeable membrane 1102 is made the same in the present invention and the conventional method, for example, when R1 is 50 mm, r is 2 mm, and R2 is 20 mm, the time (t1) can be set to one fifth of the time t2 to reach equilibrium by the conventional method.

16 is a view showing a structure of a groove attachment flange when the shape of the groove-shaped gas storage chamber is a zigzag shape.

17 is a view showing a structure of a groove attaching flange when the shape of the groove-shaped gas storage chamber is a spiral shape.

A groove attachment flange having a zigzag shape or a spiral shape may be used instead of the groove attachment flange having an arc shape in the shape of the groove-shaped gas storage chamber shown in Fig.

In the permeable membrane type gas oil analyzer in the gas oil analyzer, the gas storage chamber has a groove shape, whereby the volume of the gas storage chamber can be reduced and the thickness of the gas permeable membrane can be reduced. As a result, the time required for the concentration of the decomposition product gas in the gas storage chamber to reach the equilibrium state can be shortened, and the time required for taking the decomposition product gas can be shortened. According to the present embodiment, the time interval of the gas analyzer in insulating oil can be shortened, and it becomes possible to diagnose abnormality of a transformer or the like in real time.

The present invention is applicable to a method for analyzing gas in insulating oil of a device such as a gas analyzer in an insulating oil of a device such as a transformer in which dielectric oil is embedded and a transformer in which dielectric oil is embedded.

According to the present invention, it is possible to realize a gas analyzing apparatus for insulating oil and an analyzing method for gas in insulating oil which can detect concentrations of various gases having high reproducibility of detection using a general-purpose semiconductor sensor.

Claims (18)

A gas detector having a plurality of semiconductor sensors for detecting the concentrations of component gases from a plurality of component gases contained in the oil extracted into the gas extractor; A supply system of a sample gas for sampling a plurality of component gases contained in the drawn-out insulating oil and supplying the sampled gas to a gas detector as a sample gas to be measured, and a reference gas serving as a reference for a detection value of the semiconductor sensor A gas supply system for supplying the gas to the gas detector, a gas supply system for supplying the gas to the gas detector, a supply system for the reference gas, a supply system for the sample gas and a supply system for the reference gas, A gas regulating device, a supply system of the sample gas and the reference gas collected from the insulating oil drawn out to the gas extractor A reference gas that is supplied from, and having a of insulating oil gas analyzer having a calculation device for calculating the concentrations of multiple component gases dissolved in transformer oil based on the respective detection values respectively measured by the plurality of the semiconductor sensor of a gas detector, Wherein the conversion supply means comprises a four-way conversion valve, An inert gas supply pipe having a regulator for supplying an inert gas from an inert gas bomb is connected to the four-way valve and is configured to supply inert gas to the supply system of the reference gas and the supply system of the sample gas, In the sample gas supply system, the inert gas is supplied to the gas extractor through the inert gas supply pipe by the conversion of the four-way valve, Wherein in the supply system of the reference gas, an inert gas is supplied to the gas adjusting device through the inert gas supply pipe by the conversion of the four-way valve, and oxygen is added to form the reference gas Gas analyzer in insulating oil. The method according to claim 1, The calculation device calculates the concentration of each component gas contained in the sample gas based on the detection value of the sample gas measured by the plurality of semiconductor sensors and the detection value of the reference gas measured by the plurality of semiconductor sensors Wherein the gas analyzing apparatus comprises: 3. The method of claim 2, Wherein the calculating device calculates the concentration of each component gas contained in the sample gas based on the ratio between the detection value of the sample gas measured by the plurality of semiconductor sensors and the detection value of the reference gas, Analysis device. 3. The method according to claim 1 or 2, Wherein the inert gas is nitrogen. 3. The method according to claim 1 or 2, The sample gas, which collects a plurality of component gases from the insulating oil of the gas extractor and supplies the sample gas to the gas detector as the sample gas, includes a dissolved gas derived from the insulating oil by bubbling the inert gas into the insulating oil of the gas extractor, Wherein the sample gas is generated by adding oxygen to the gas mixture in the gas adjusting device. 3. The method according to claim 1 or 2, And a regulator for maintaining the temperature of the sample gas and the reference gas at a desired value. 3. The method according to claim 1 or 2, The calculation device calculates the gas concentration of a specific component in the sample gas from the detection values detected by the first sensor group of the plurality of semiconductor sensors provided in the gas detector, Wherein the concentration of the plurality of component gases in the sample gas is determined by obtaining the concentration of the other component gas from the detected value calculated by the first sensor group and the gas concentration of the specific component calculated and detected by the first sensor group, Analysis device. The method according to claim 1, And a monitoring device for monitoring the concentration of a plurality of component gases dissolved in the insulating oil calculated by the calculating device. 9. The method of claim 8, And a communication means for sending a monitoring situation of the concentration of a plurality of component gases dissolved in the insulating oil contained in the apparatus in the monitoring apparatus to the outside. A plurality of component gases contained in the insulating oil are sampled from the insulating oil drawn out to the gas extractor, and the sampled gas is supplied to the gas detector through the sample gas supply system as the sample gas to be measured The reference gas serving as a reference for the detection values of a plurality of semiconductor sensors provided in the gas detector can be supplied to the gas detector through the reference gas supply system and the sample gas supplied through the sample gas supply system And the reference gas supplied through the reference gas supply system is converted and supplied to the gas detector, and the concentration of the component gas and the concentration of the reference gas are supplied to the gas detector from the plurality of component gases contained in the sample gas A plurality of semiconductor sensors, and a gas detector In the analysis of gases in a transformer oil to obtain, by calculation of the operational device, the concentration of a plurality of gas components included in the plurality of samples on the basis of the respective measured angle value detected by the semiconductor gas sensor, A four-way converter valve is used to convert a reference gas supplied through a supply system of a reference gas and a sample gas supplied through a sample gas supply system to select and supply the gas to a gas detector, The inert gas supply system of the inert gas supply system is connected to the four-way switch valve, and the conversion system of the four-way switch valve switches the supply system of the reference gas and the sample Supplying an inert gas to the gas supply system through an inert gas supply system, The sample gas supply system allows the inert gas to be supplied to the gas extractor through the inert gas supply system by the conversion operation of the four- The reference gas supply system converts oxygen into an inert gas supplied through an inert gas supply system through an oxygen supply system for supplying oxygen from an oxygen cylinder to convert the reference gas into a reference gas Wherein the gas is analyzed by a gas analyzing method. 11. The method of claim 10, The calculation of the concentration of the plurality of component gases contained in the sample gas is included in the sample gas based on the detection values of the sample gas measured by the plurality of semiconductor sensors and the detection values of the reference gas measured by the plurality of semiconductor sensors Wherein the concentration of each component gas is determined by calculation. The method according to claim 1, Wherein the gas extractor includes a gas permeable membrane disposed in an insulating oil extraction port of the insulated inlet device and a gas storage chamber in contact with the gas permeable membrane to store a sample gas permeated through the gas permeable membrane, A carrier gas supply port and a carrier gas extraction port for sending the sample gas to the outside are installed in the gas storage chamber and the sample gas is sent to the gas detector by the supply of the carrier gas, Gas analyzer in insulating oil. 13. The method of claim 12, And a groove-like passage connecting the carrier gas supply port and the carrier gas discharge port is the gas storage chamber. 13. The method of claim 12, Wherein a cross-sectional area of a groove of the gas storage chamber having a groove shape is equal to or smaller than a cross-sectional area of the carrier gas supply port. 13. The method of claim 12, Wherein the volume of the gas storage chamber is made equal to the volume of the sample gas required for gas measurement in the gas measuring instrument. 13. The method of claim 12, Wherein a gas pipe communicating with the gas measuring device and the carrier gas discharge port provided in the gas storage chamber is provided so that sample gas sent from the carrier gas extracting port is supplied to the gas measuring device. 17. The method of claim 16, Characterized in that the shape of the groove of the gas reservoir is a linear shape, an arc shape, a zigzag shape, or a spiral shape, the carrier gas supply port is provided at one end of the groove and the carrier gas extraction port is provided at the other end Gas analyzer in insulating oil. 13. The method of claim 12, The calculation device calculates the concentration of each component gas contained in the sample gas based on the detection value of the sample gas measured by the plurality of semiconductor sensors and the detection value of the reference gas measured by the plurality of semiconductor sensors Wherein the gas analyzing apparatus comprises:

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