JP2017130565A - Device and method for diagnosing abnormality of oil filled electrical apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for diagnosing abnormality of oil-filled electrical apparatus capable of diagnosing internal abnormality on the spot without bringing a sample, such as insulating oil and gas collected from the oil-filled electrical apparatus, in a search facility or the like having an analyzer in a hermetic type oil-filled electrical apparatus.SOLUTION: Abnormality diagnosis means 9 having a hydrogen absorbing alloy, a heating device, and a hydrogen sensor housed therein is provided on a breathing tube 8 of a hermetic type oil-filled electrical apparatus A, and hydrogen in decomposition gas is absorbed once in the hydrogen absorbing alloy. After that, the internal abnormality of the oil-filled electrical apparatus is diagnosed on the spot by measuring the amount of hydrogen discharged from an alloy using a hydrogen sensor by heating the alloy by the heating device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an abnormality diagnosis device and an abnormality diagnosis method for oil-filled electrical equipment that is insulated with insulating oil.

Conventionally, gas analysis in oil has been widely used as an internal diagnostic technique for oil-filled electrical equipment. The internal abnormal phenomenon of oil-filled electrical equipment is accompanied by heat generation such as partial discharge or local overheating. Insulating oil or insulating paper in contact with the heat source, or insulating material such as press board or bakelite will undergo chemical decomposition reaction. Oxidation, carbon monoxide (CO), carbon dioxide (CO ₂ ), hydrogen (H ₂ ), methane (CH ₄ ), ethane (C ₂ H ₆ ), ethylene (C ₂ H ₄ ), acetylene (C ₂ H ₂₎ ) And the like (hereinafter referred to as cracked gas).

  Many cracked gases have a high solubility in insulating oil, and most of them dissolve in insulating oil. Extracting and analyzing the gas in insulating oil collected from oil-filled electrical equipment, the amount of gas and the amount of gas By measuring the composition, it is possible to determine the presence / absence of abnormality inside the oil-filled electrical device and the degree of abnormality.

  By the way, a conservator for a sealed oil-filled electrical device is provided with a shield that blocks the insulating oil contained in the tank together with the device body from oxygen in the air. This shield has the property of allowing a very small amount of cracked gas generated by internal abnormality to permeate. However, since the permeated cracked gas is diluted with the air in the conservator, even if the air in the conservator is analyzed as it is, the concentration of the cracked gas is low and it is very difficult to find an internal abnormality.

  The present applicant places an alloy that absorbs hydrogen in the cracked gas on the breathing path of the open-type oil-filled electrical device, and uses the breathing action of the oil-filled electrical device even in the low temperature abnormal overheating with a small amount of cracked gas. We proposed a method of diagnosing internal abnormalities in oil-filled electrical equipment by temporarily storing hydrogen in the cracked gas in the alloy, then releasing the hydrogen from the alloy and measuring the amount of hydrogen (Patent below) Reference 1).

  By applying the means for temporarily storing hydrogen in the cracked gas to the alloy that stores hydrogen in the cracked gas of this method on the breathing path to which the hygroscopic respirator of the sealed oil-filled electric device is attached, the sealed oil-filled electric It is possible to diagnose the presence and extent of equipment abnormality.

Japanese Patent No. 5806475

  However, in the method described in Patent Document 1, it is assumed that an abnormality is diagnosed by taking an alloy that absorbs hydrogen in the cracked gas to a research facility and performing an analysis. Can not do it.

Furthermore, in the method described in Patent Document 1, the alloy disposed on the breathing path of the oil-filled electrical device also comes into contact with air outside the oil-filled electrical equipment (hereinafter referred to as “atmosphere”) flowing into the breathing path. The hydrogen contained in the water will be occluded. Although the amount of hydrogen in the atmosphere is less than a few [ppm], the amount of hydrogen in the cracked gas that permeates the shield of the conservator is very small, so the amount of hydrogen in the cracked gas is affected by the hydrogen contained in the atmosphere. Cannot be measured accurately.

  Therefore, the present invention improves the method described in Patent Document 1 above, thereby enabling accurate measurement of the amount of hydrogen in the cracked gas, and abnormality of oil-filled electrical equipment that can diagnose the presence of internal abnormality on site. A diagnostic device and an abnormality diagnosis method were provided.

The invention according to claim 1 is an oil-filled electrical device in which a device main body is housed in a tank together with an insulating oil. An alloy that occludes hydrogen in the decomposition gas of the insulating material is disposed on a breathing path to which a hygroscopic respirator of an electrical device is attached, a heating means is provided in a container that accommodates the alloy that occludes hydrogen, and further occludes the hydrogen The present invention is characterized in that an abnormality diagnosing means is provided, in which a hydrogen sensor for measuring the amount of hydrogen released by heating the alloy storing hydrogen is disposed in a case that houses the alloy and the heating means.

  The invention according to claim 2 is an oil-filled electrical device in which a device main body is housed in a tank together with an insulating oil. An alloy that occludes hydrogen in the decomposition gas of the insulating material is disposed on a breathing path to which a hygroscopic respirator of an electrical device is attached, a heating means is provided in a container that accommodates the alloy that occludes hydrogen, and further occludes the hydrogen An abnormality diagnosing means comprising a hydrogen sensor for measuring the amount of hydrogen released by heating the alloy that stores the hydrogen in a case containing the alloy and the heating means, and the abnormality diagnosing means and the hygroscopic respirator It is characterized in that it is provided with a diagnosis assisting means in which an alloy that occludes hydrogen in the air outside the oil-filled electrical device is disposed.

In the invention according to claim 3, the decomposing gas of the insulating material is disposed on the breathing path to which the hygroscopic respirator of the sealed oil-filled electrical apparatus having a conservator having a shield that blocks the contact between the insulating oil and the air is attached. An alloy that stores hydrogen is disposed, the hydrogen in the cracked gas is temporarily stored in the alloy that stores hydrogen, and then the hydrogen is stored by heating means provided in a container that stores the alloy that stores hydrogen. The hydrogen stored in the alloy that releases hydrogen is released, and the amount of hydrogen is measured by a hydrogen sensor provided in a case that houses the alloy that stores the hydrogen and the heating means. It is characterized by diagnosing internal abnormalities of input electrical equipment.

  According to invention of Claim 1 and Claim 3, the said hydrogen is occluded by providing the heating means which heats the alloy which occludes hydrogen, and the hydrogen sensor which measures the quantity of the hydrogen discharge | released by heating. The presence and extent of internal abnormalities can be diagnosed locally without taking the alloy back to a research facility with analytical equipment.

According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, by disposing an alloy that occludes hydrogen on the path through which the atmosphere flows from the hygroscopic respirator to the abnormality diagnosis means, The alloy that occludes hydrogen in the inside can eliminate occlusion of hydrogen contained in the atmosphere, and the accuracy of internal abnormality diagnosis can be further improved.

It is a front view of the oil-filled electrical apparatus which shows 1st Example of this invention. It is a perspective view which shows the structure of the abnormality diagnosis means of 1st Example. It is a front view of the oil-filled electrical apparatus which shows 2nd Example of this invention. It is a perspective view which shows the structure of the abnormality diagnosis means and diagnosis assistance means of 2nd Example.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a front view of an oil-filled electrical device (oil-filled transformer A) employing the abnormality diagnosis method according to the first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a tank of the oil-filled transformer A, and 2 denotes a transformer body made of an iron core, a coil, or the like that is housed and fixed in the tank 1.

  An insulating oil 3 is filled in the transformer tank 1 to cool and insulate the transformer body 2, and 4 is a conservator attached to the upper part of the transformer tank 1.

Reference numeral 5 denotes a drain cock provided in the lower part of the transformer tank 1 for extracting the insulating oil 3 filled in the transformer tank 1. Insulating oil 3 can be collected from the transformer tank 1 without being exposed to the atmosphere by connecting the syringe to the drain cock 5 and pulling the piston, or by its own weight.

Reference numeral 6 denotes a shield that blocks the contact between the air and the insulating oil 3 inside the conservator 4. Also,
Reference numeral 7 denotes a hygroscopic respirator connected to the other end of a respiratory tube 8 having one end connected to the upper part of the conservator 4, and a hygroscopic agent (not shown) such as silica gel is accommodated in the respirator 8. This prevents damp air from flowing into the transformer tank 1.

  Reference numeral 9 denotes an abnormality diagnosis means for diagnosing an internal abnormality of the oil-filled transformer A. The abnormality diagnosing means 9 is configured by housing an alloy (hereinafter referred to as a hydrogen storage alloy) that stores hydrogen in a cracked gas (not shown) in a case 9a. A hydrogen storage alloy is an alloy developed for the purpose of absorbing hydrogen by optimizing it by alloying a metal having a property of taking in hydrogen, and is also called a hydrogen storage alloy.

FIG. 2 is a perspective view showing the structure of the abnormality diagnosis means 9. The abnormality diagnosis means 9 includes a hollow cylindrical case 9a, an alloy (hereinafter referred to as hydrogen storage alloy) 10 for storing hydrogen in the cracked gas, a hollow cylindrical internal container 11 for storing the hydrogen storage alloy 10, and an outer side of the internal container 11 A heating means (heater or the like) 12 that is operated by supplying electricity from the outside and a hydrogen sensor 13 that measures the amount of hydrogen released from the hydrogen storage alloy 10 are installed inside the case 9a. Further, a connector (not shown) for connecting a display unit (not shown) for displaying the amount of hydrogen measured by the hydrogen sensor 13 is provided outside the case 9a.

  Next, a method for diagnosing an internal abnormality of the oil-filled transformer A by the abnormality diagnosis means 9 will be described. When an internal abnormality occurs in the oil-filled transformer A, the insulating material such as the insulating oil 3 or the insulating paper that comes into contact with the heat source causes a chemical decomposition reaction.

  By this chemical decomposition reaction, decomposition gas is generated and dissolved in the insulating oil 3. A small amount of cracked gas is generated even during normal operation, but the amount generated when an internal abnormality occurs increases compared to normal operation and deviates from normal operation.

  The hydrogen in the cracked gas whose generated amount has increased passes through the shield 6 from the oil surface of the insulating oil 3 in the conservator 4 of the oil-filled transformer A shown in FIG. Since the abnormality diagnosis means 9 is connected to the respiratory tube 8 as described above, the hydrogen flowing into the respiratory tube 8 is sent to the abnormality diagnosis means 9.

The hydrogen sent to the abnormality diagnosis means 9 is absorbed by the hydrogen storage alloy 10 housed in the hollow cylindrical inner container 11 shown in FIG. Decomposed gas other than hydrogen flows into the respiratory tube 8 below the abnormality diagnosing means 9 and is released to the outside through the hygroscopic respirator 7 shown in FIG.

  After the hydrogen storage alloy 10 of the abnormality diagnosis means 9 absorbs hydrogen in the cracked gas, the hydrogen storage alloy 10 is heated by operating the heating means (heater or the like) 12 installed outside the inner container 11. The hydrogen once occluded is released. Then, the amount of released hydrogen is measured by a generally circulating hydrogen sensor 13 installed inside the case 9 a, and the measured hydrogen amount is confirmed by a display unit connected to the connector of the hydrogen sensor 13. Diagnose the presence and degree of internal abnormality of the incoming transformer A.

  In the above description, the measurement value measured by the hydrogen sensor 13 is visited and checked to diagnose the presence and degree of internal abnormality of the oil-filled transformer A. However, the heating means 12 and the hydrogen sensor 13 are remotely connected. By operating and sending the measurement result of the hydrogen amount by the hydrogen sensor 13 through a communication means such as a telephone line, the presence or absence of the internal abnormality of the oil-filled transformer A may be diagnosed without going to the site.

  Furthermore, as another method, hydrogen is lighter than air and tends to accumulate in the space above the shield 6 of the conservator 4. Therefore, a valve is provided above the conservator 4 and an inert gas such as argon is blown from the valve. Then, by pushing out the air containing hydrogen in the space above the shield 6 of the conservator 4 to the outside through the hygroscopic respirator 7, all the hydrogen in the air in the space above the shield 6 of the conservator 4 and in the respiratory tube 8 is removed. After the hydrogen storage alloy 10 stores the hydrogen, the hydrogen storage alloy 10 concentrates the hydrogen in the space above the shield 6 of the conservator 4 and the breathing tube 8, and then the amount of hydrogen stored in the hydrogen storage alloy 10 is measured. Thus, the presence / absence and degree of internal abnormality of the oil-filled transformer A may be diagnosed. As a method for bringing the air containing hydrogen in the space above the shield 6 of the conservator 4 and the breathing tube 8 into contact with the hydrogen storage alloy 10, a valve provided on the upper part of the conservator 4 is opened and connected to the hygroscopic respirator 7. The air containing the decomposition gas in the space above the shield 6 of the conservator 4 may be sucked with a vacuum pump or the like.

FIG. 3 is a front view of the oil-filled transformer A according to the second embodiment of the present invention. The same parts as those of the oil-filled transformer A shown in FIG. The oil-filled transformer A in FIG. 3 is in the atmosphere flowing into the abnormality diagnosis means 9 from the outside of the oil-filled transformer A through the moisture-absorbing respirator 7 between the moisture absorption respirator 7 and the abnormality diagnosis means 9 on the respiratory tube 8. And a diagnostic auxiliary means 14 for removing hydrogen. As shown in FIG. 4, the diagnosis assisting means 14 is configured by housing a hydrogen storage alloy 14c in an inner container 14b in a case 14a.

When an internal abnormality occurs in the oil-filled transformer A shown in FIG. 3, the insulating material such as the insulating oil 3 and insulating paper causes a chemical reaction, and decomposed gas is generated. A small amount of cracked gas is generated even during normal operation, but the amount generated when an internal abnormality occurs increases compared to normal operation and deviates from normal operation.

The hydrogen in the cracked gas whose generated amount has increased passes through the shield 6 from the oil surface of the insulating oil 3 in the conservator 4 of the oil-filled transformer A shown in FIG. Since the abnormality diagnosis means 9 is connected to the respiratory tube 8 as described above, the hydrogen flowing into the respiratory tube 8 is sent to the abnormality diagnosis means 9.

  The hydrogen sent to the abnormality diagnosis means 9 is absorbed by the hydrogen storage alloy 10 (see FIG. 4) accommodated in the case 9a of the abnormality diagnosis means 9.

  On the other hand, the air around the oil-filled transformer A flows into the respiratory tube 8 through the hygroscopic breathing device 7 by the breathing action of the oil-filled transformer A. The inflowing hydrogen in the atmosphere is absorbed by the hydrogen storage alloy 14c (see FIG. 4) constituting the diagnosis auxiliary means 14, and is not absorbed by the hydrogen storage alloy 10 constituting the abnormality diagnosis means 9. In particular, by adopting a magnesium alloy system for the hydrogen storage alloy 14c, the hydrogen once absorbed by the hydrogen storage alloy 14c becomes difficult to be released and can be prevented as much as possible from being absorbed by the hydrogen storage alloy 10. Therefore, the amount of hydrogen absorbed by the hydrogen storage alloy 10 of the abnormality diagnosis means 9 is only hydrogen in the cracked gas generated by the internal abnormality of the oil-filled transformer A.

  After the hydrogen storage alloy 10 of the abnormality diagnosing means 9 absorbs hydrogen in the cracked gas, the heating means 12 (heater or the like) installed outside the internal container 11 for storing the hydrogen storage alloy 10 is operated to heat. Thus, hydrogen once absorbed in the hydrogen storage alloy 10 is released. Then, the amount of released hydrogen is measured by a commonly distributed hydrogen sensor 13 installed inside the case 9a, and the measured hydrogen amount is confirmed by a display unit connected to the connector of the hydrogen sensor 13, Diagnose the presence and extent of internal abnormality in oil-filled transformer A.

  In the above description, the measurement value measured by the hydrogen sensor 13 is visited and checked to diagnose the presence and degree of internal abnormality of the oil-filled transformer A. However, the heating means 12 and the hydrogen sensor 13 are remotely connected. By operating and sending the measurement result of the hydrogen amount by the hydrogen sensor 13 through a communication means such as a telephone line, the presence or absence of the internal abnormality of the oil-filled transformer A may be diagnosed without going to the site.

Furthermore, as another method, hydrogen is lighter than air and tends to accumulate in the space above the shield 6 of the conservator 4. Therefore, a valve is provided above the conservator 4 and an inert gas such as argon is blown from the valve. Then, by pushing out the air containing hydrogen in the space above the shield 6 of the conservator 4 to the outside through the hygroscopic respirator 7, all the hydrogen in the air in the space above the shield 6 of the conservator 4 and in the respiratory tube 8 is removed. After the hydrogen storage alloy 10 stores the hydrogen, the hydrogen storage alloy 10 concentrates the hydrogen in the space above the shield 6 of the conservator 4 and the breathing tube 8, and then the amount of hydrogen stored in the hydrogen storage alloy 10 is measured. Thus, the presence / absence and degree of internal abnormality of the oil-filled transformer A may be diagnosed. As a method for bringing the air containing hydrogen in the space above the shield 6 of the conservator 4 and the breathing tube 8 into contact with the hydrogen storage alloy 10, a valve provided on the upper part of the conservator 4 is opened and connected to the hygroscopic respirator 7. The air containing the decomposition gas in the space above the shield 6 of the conservator 4 may be sucked with a vacuum pump or the like.

  As described above, according to the present invention, the internal abnormality of the oil-filled transformer A can be diagnosed on site by using a heating device, a hydrogen sensor, and a hydrogen storage alloy.

  Further, there is an advantage that the oil-filled transformer A does not need to be remodeled greatly in order to improve diagnostic accuracy.

  It can be used to diagnose internal abnormalities such as oil-filled transformers.

DESCRIPTION OF SYMBOLS 1 Transformer tank 2 Transformer main body 3 Insulating oil 4 Conservator 5 Oil drain cock 6 Shielding body 7 Hygroscopic respirator 8 Respiratory tube 9 Abnormality diagnosis means 9a, 14a Case 10, 14c Hydrogen storage alloy 11, 14b Inner container
12 Heating means 13 Hydrogen sensor 14 Diagnosis assistance means
A Oil-filled transformer

Claims (3)

An alloy that occludes hydrogen in the decomposition gas of the insulating material is placed on the breathing path where the hygroscopic respirator of a sealed oil-filled electrical device having a conservator with a shield that blocks the contact between insulating oil and air is installed. A hydrogen sensor for measuring the amount of hydrogen released from the alloy for storing hydrogen in the case for storing the alloy for storing hydrogen and the alloy for storing the heating means; An apparatus for diagnosing abnormality in oil-filled electrical equipment, characterized by comprising an abnormality diagnosis means arranged. An alloy that occludes hydrogen in the decomposition gas of the insulating material is placed on the breathing path where the hygroscopic respirator of a sealed oil-filled electrical device having a conservator with a shield that blocks the contact between insulating oil and air is installed. A hydrogen sensor for measuring the amount of hydrogen released from the alloy for storing hydrogen in the case for storing the alloy for storing hydrogen and the alloy for storing the heating means; An abnormality diagnosis means arranged, and a diagnosis auxiliary means in which an alloy that absorbs hydrogen in the air outside the oil-filled electrical device is arranged between the abnormality diagnosis means and the hygroscopic respirator. Abnormality diagnosis equipment for oil-filled electrical equipment. An alloy that occludes hydrogen in the decomposition gas of the insulating material is placed on the breathing path where the hygroscopic respirator of a sealed oil-filled electrical device having a conservator with a shield that blocks the contact between insulating oil and air is installed. Then, the hydrogen in the cracked gas is temporarily stored in the alloy that stores hydrogen, and then the alloy that stores hydrogen is heated by heating means provided in a container that stores the alloy that stores hydrogen. The stored hydrogen is released into the stored alloy, and the amount of hydrogen is measured by a hydrogen sensor provided in the case containing the alloy storing the hydrogen and the heating means, thereby diagnosing an internal abnormality of the oil-filled electrical device. An abnormality diagnosis method for oil-filled electrical equipment.

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