JPH08254564A - Inspection device for lightning arrestor leakage current detection device and simulated leakage current generation circuit for lightning arrester - Google Patents

Abstract

PURPOSE: To obtain an equipment for inspecting the performance of leak current detector for arrester. CONSTITUTION: The inventive inspection equipment comprises a circuit 1 generating a simulation applying voltage 1a, a simulation applying voltage/simulation resistance component current conversion circuit 2 outputting a simulation resistance component current 2a, a simulation applying voltage/simulation capacitor component current conversion circuit 3 outputting a simulation capacitor component current 3a, a circuit 4 outputting a simulation leak current 4a, and means for comparing a resistance component current 7a from an arrester leak current detector 7 receiving the simulation leak current 4a with the simulation resistance component current 2a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection device for inspecting the operation of a lightning arrester leakage current detecting device for diagnosing characteristic deterioration of a lightning arrester, particularly a zinc oxide type lightning arrester, and a simulated leakage current generating circuit for the lightning arrester used in the device. Is.

[0002]

2. Description of the Related Art A zinc oxide type arrester used in a power system will be described with reference to FIGS. FIG. 9 is an electrical equivalent circuit of a zinc oxide surge arrester, showing a circuit in which a resistor and a capacitor are connected in parallel. When the applied voltage V is applied to the zinc oxide arrester, a leakage current I _MOA that is a combined current of the resistance component current I _R and the capacitance component current I _C flows through the zinc oxide arrester. FIG. 10 is a vector diagram of commercial frequencies of applied voltage, resistance current, capacitance current and leakage current when voltage is applied to the zinc oxide arrester, and FIG. 11 is when applied voltage is applied to the zinc oxide arrester. FIG. 6 is a diagram showing waveforms of an applied voltage, a resistance component current, a capacitance component current, and a leakage current of the. As shown in FIGS. 10 and 11, with respect to the applied voltage V, the resistance current I _R has the same phase, the capacitance current I _C has a 90-degree lead phase, and the leakage current I _MOA has the resistance current I _R and the capacitance component. Current I
It is a θ-degree lead phase that is a combination of _C.

FIG. 12 is a diagram showing voltage-resistance current characteristics of a zinc oxide element which is a lightning arrester of a zinc oxide type lightning arrester. Generally, the characteristic of the voltage V and the current I of the zinc oxide element, that is, the non-linear resistance characteristic is shown by the non-linear curve C _O shown by the solid line in FIG. 12, and in the normal ground voltage, of the leakage current I _MOA , The capacitor current I _C not represented by occupies the majority. Here, the normal ground voltage is an applied voltage applied from the power system to the zinc oxide arrester during steady operation. When the zinc oxide type arrester deteriorates due to a severe duty such as a lightning surge, a switching surge or the application of an AC overvoltage, the resistance characteristic of the zinc oxide element shows a curve C ₁ shown by a dotted line in the region of FIG. The characteristics in the low current region change as shown by C ₂ . This is mainly due to the resistance current IR flowing through the zinc oxide type arrester.
It is known that this is due to an increase in In order to detect the tendency of deterioration of the zinc oxide surge arrester at an early stage and use it for preventive maintenance, it is necessary to separate and detect the resistance component current from the leakage current flowing through the zinc oxide surge arrester. A variety of lightning arrester leakage current detection devices have been produced as.

FIG. 13 shows, for example, Mitsubishi Electric Technical Report Vol5.
5. It is the block diagram which shows the principle of the zinc oxide type arrester leakage current detection device described in No. 3.1981. In FIG. 13, 101 is a zinc oxide type arrester, 10
2 is a current detector for detecting a leakage current I _MOA flowing through the zinc oxide type arrester 101, and 103 is a zinc oxide type arrester 101.
PT (instrument transformer) for converting the voltage V applied to the transmission line to the voltage level of the lightning arrester leakage current detection device 104, 105 and 106 are bandpass filters for passing commercial frequency signals, and 107 is leakage current. A capacitance current cancel circuit for obtaining a resistance current from the I _{MOA 105} , 108
Is an indicator for indicating the resistance component current I _R108 output from the capacitance component current cancel circuit 107.

FIG. 14 shows waveforms of the applied voltage, the leakage current and the resistance component current in the lightning arrester leakage current detection device 104 of FIG. 13, where (a) is the bandpass filter 1.
06 shows the waveform of the voltage V ₁₀₆ , (b) _shows the waveform of the leakage current I _MOA 105 output from the bandpass filter 105, and (c) shows the voltage of the leakage current I _{MOA105 in} the capacitance current cancel circuit 107. The waveform of the leakage current I _{MOA107 extracted} in the positive half-wave period of V ₁₀₆ , (d) is the waveform of the resistance current I _R108 output as the average value of the leakage current I _MOA107 by the capacitance current cancellation circuit 107.

Next, the operation of the arrester leakage current detection device 104 will be described. The leakage current I _MOA flowing through the zinc oxide type arrester 101 is detected by the current detector 102 and sent to the arrester leakage current detection device 104. Leakage current I _MOA
If the signal contains a harmonic component, the detected electric signal also contains a harmonic component. The bandpass filter 105 extracts the electric signal I _MOA 105 for only the commercial frequency. On the other hand, the applied voltage V applied to the zinc oxide arrester 101 is converted by the PT 103 into the voltage level of the arrester leakage current detection device 104. With respect to the applied voltage with the voltage level converted, the applied voltage V ₁₀₆ for only the commercial frequency is taken out by the bandpass filter 106 so that the capacity-current cancel circuit 107 is not affected by the distortion of the applied voltage V. Capacitance current cancel circuit 1
In 07, first, the positive half-wave periods of the applied voltage V ₁₀₆ leakage current I _MOA105 is passed, the negative half-wave periods of the applied voltage V ₁₀₆ is by cutting, to obtain the leakage current I _MOA107. Here, since the leakage current I _MOA107 is a _combination of a positive half-wave component capacitance current and a resistance component current, an average value of the leakage current I _MOA107 is canceled because the capacitance component current averages the half-wave component and is canceled. Is obtained. As a result, the resistance component current I _R108 is output from the capacitance component current cancel circuit 107 as the average value of the leakage current I _MOA107 , and this is output to the resistance component current indicator 108.
To instruct. The zinc oxide surge arrester 101 is monitored by monitoring the value of the resistance current I _R108 indicated by the resistance current indicator 108.

[0007]

In the conventional arrester leakage current detecting device as described above, characteristic deterioration of the arrester can be diagnosed by the resistance component current detected by the arrester leakage current detecting device. It is necessary that the arrester leakage current detection device is operating normally. However, there is currently no inspection device for inspecting whether or not the arrester leakage current detection device is operating normally. Therefore, the performance inspection of the arrester leakage current detecting device cannot be performed regularly, and the long-term reliability of the arrester leakage current detecting device is low.

The present invention has been made to solve the above problems, and provides an inspection device and a simulated leakage current generation circuit of a lightning arrester, which can easily perform a performance inspection during use of the lightning arrester leakage current detection device. The purpose is to Furthermore, for the arrester leakage current detection device that can generate the applied voltage and leakage current signal of the arrester that is input to the arrester leakage current detection device in response to various applied voltages and various performance deteriorations of the arrester. To provide a simulated leakage current generation circuit for an inspection device and a lightning arrestor, to facilitate periodic performance inspection of the lightning arrester leakage current detection device, and to contribute to improving the reliability of the arrester leakage current detection device. And

[0009]

SUMMARY OF THE INVENTION An inspection device for a surge arrester leakage current detecting device according to the present invention includes a simulated applied voltage generating circuit for outputting a simulated applied voltage and a simulated resistance component current according to the simulated applied voltage. Applied voltage-simulated resistance component current conversion circuit, simulated applied voltage-simulated capacitance component current conversion circuit that outputs simulated capacitance component current according to simulated application voltage, simulated leakage current output circuit that outputs simulated leakage current, and simulation A comparison means for comparing the resistance component current output from the lightning arrester leakage current detection device that inputs the leakage current or the simulated leakage current and the simulated applied voltage with the simulated resistance component current output from the simulated applied voltage-simulated resistance component current conversion circuit. It is composed of and.

The lightning arrester simulated leakage current generator according to the present invention includes a simulated applied voltage generating circuit for outputting a simulated applied voltage and a simulated applied voltage-simulated resistance for outputting a simulated resistance component current according to the simulated applied voltage. It is configured by a split current conversion circuit, a simulated applied voltage-simulated capacitance divided current conversion circuit that outputs a simulated capacitance divided current according to the simulated applied voltage, and a simulated leakage current output circuit that outputs simulated leakage current. .

Further, the simulated applied voltage generating circuit includes a sine wave voltage generating circuit that outputs a sine wave voltage, a harmonic voltage generating circuit that outputs a harmonic voltage, and a surge arrester that adds the harmonic voltage to the sine wave voltage. It is provided with a harmonic voltage adding circuit for obtaining a simulated applied voltage applied to the.

Further, the simulated applied voltage generating circuit includes a sine wave voltage generating circuit for outputting a sine wave voltage, an overvoltage generating circuit for outputting an overvoltage, and a simulated application for adding an overvoltage to the sine wave voltage and applying the surge arrester. It is provided with an overvoltage addition circuit for obtaining a voltage.

Furthermore, the lightning arrester element of the lightning arrester is formed of a zinc oxide element having a non-linear resistance characteristic.

[0014]

The inspection device for the arrester leakage current detecting device according to the present invention compares the simulated resistance component current obtained by the simulated applied voltage-simulated resistance component current conversion circuit with the resistance component current obtained by the arrester leakage current detection device. Therefore, the resistance component current, which is the main output value of the arrester leakage current detection device, can be used.

Further, the simulated leakage current generating circuit of the lightning arrester according to the present invention generates a simulated applied voltage,
Since the simulated resistance component current for the resistance of the arrester and the simulated capacitance current for the capacitance of the arrester in consideration of the phase difference can be obtained, a simulated leakage current of the arrester can be generated.

Further, a simulated leak current can be generated even with respect to a simulated applied voltage in which the applied voltage contains a harmonic component, and the resistance obtained from the simulated leak current and the arrester leakage current detecting device. The partial currents can be compared.

Further, a simulated leak current can be generated even with respect to a simulated applied voltage in which the applied voltage includes an overvoltage component, and the simulated leakage current and the resistance component obtained from the arrester leakage current detection device. The currents can be compared.

Further, the leakage current of a zinc oxide type arrester using a zinc oxide element having a non-linear resistance characteristic can be simulated and it can be applied to an inspection device of a zinc oxide type arrester leakage current detecting device.

[0019]

【Example】

Example 1. An embodiment of the inspection device for a lightning arrester leakage current detection device and a simulated lightning current generation circuit for a lightning arrester according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an inspection device for a lightning arrester leakage current detection device. First, the simulated leakage current generation circuit of the lightning arrester will be described. In FIG.
Reference numeral 1 is a simulated applied voltage generating circuit for generating a commercial frequency sine wave voltage which is a simulated applied voltage 1a simulating the applied voltage to the zinc oxide type arrester, and 2 is the non-linear electrical resistance of the lightning arrester element of the zinc oxide type arrester. A simulated applied voltage-simulated resistance current conversion circuit for obtaining a simulated resistance current 2a from a simulated applied voltage 1a, which has a conversion circuit simulating characteristics, and 3 for obtaining a simulated capacitance current 3a from the simulated applied voltage 1a. Simulated applied voltage −
The simulated capacitance current conversion circuit 4, the simulated resistance current 2a and the simulated capacitance current 3a are added in consideration of the phase difference to obtain the simulated leakage current 4a, and the simulated leakage current output circuit 5 is applied to the simulated applied voltage generation circuit 1 , A simulated applied voltage-simulated resistance component current conversion circuit 2, a simulated applied voltage-simulated capacitance component current conversion circuit 3, and a simulated leakage current output circuit 4 for a surge arrester simulated leakage current generation circuit.

Here, the simulated applied voltage-simulated resistance current conversion circuit 2 will be described with reference to FIGS. 2 and 3, assuming that the simulated applied voltage 1a is V ₁ and the simulated resistance current 2a is I _R1 . 2 is similar to the diagram showing the voltage-resistance component current characteristics of the zinc oxide element which is the lightning protection device shown in FIG. 12, when the simulated application voltage V ₁ is applied to the zinc oxide type arrester, the simulated resistance component current I _The figure showing _R1 (non-linear resistance characteristic) is divided into three regions (r1, r2, r3), and the resistance characteristic in each region is modeled by linear approximation. FIG. 3 is a diagram showing a case where the simulated applied voltage-simulated resistance current conversion circuit 2 is configured by an analog logic circuit. In FIG.
In 50, the simulated applied voltage V ₁ is compared with the reference voltage V _P , and V ₁ >
A comparator circuit that outputs a HIGH signal when V _P , a comparator circuit 51 that compares the simulated applied voltage V ₁ with the reference voltage V _Q , and a HIGH signal when V ₁ > V _Q , and a comparator circuit 52.
An inverter for inverting the signal from the reference numeral 53 is a comparison circuit 51.
Inverter for inverting the signal from, 54 is the inverter 5
2 and an AND circuit that multiplies the signals from the inverter 53, 55 is an AND circuit that multiplies the signals from the comparison circuit 50 and the inverter 53, and 56, 57, and 58 are simulated applied voltages due to the electric resistances of the regions r1, r2, and r3, respectively. V ₁
To a simulated resistance current I _R1 from a voltage-current conversion circuit 59, 60, 61 are AND circuits 54, AN, respectively.
When the HIGH signal is input from the D circuit 55 and the comparison circuit 51, it is a relay that operates the switches 62, 63, and 64, respectively.

For example, if the simulated applied voltage V ₁ is 0 <V ₁ <V _P
At this time, only the switch 62 is turned on from the outputs of the comparison circuits 50 and 51, the inverters 52 and 53, and the AND circuit 54, and the simulated resistance current I _R1 is output due to the corresponding electric resistance in the region r1. Similarly, the simulated applied voltage V ₁ is Vr
Even when P <V ₁ <V _Q and V ₁ > V _Q , the regions r2 and r3
The simulated resistance current I _R1 corresponding to is output. The method of outputting the simulated resistance component current I _R1 from the simulated applied voltage V ₁ by the analog logic circuit has been described.
The voltage-resistance current characteristic of zinc oxide, which is the lightning protection element, is stored in the OM, and the simulated resistance current I _{R1 is} read from the address in the ROM corresponding to the input signal of the simulated applied voltage V _1.
May be read. Further, when the simulated applied voltage V ₁ input to the simulated applied voltage-simulated resistance current conversion circuit 2 or the simulated resistance current I _R1 output from the simulated applied voltage-simulated resistance current conversion circuit 2 requires an analog signal. In this case, an A / D converter or a D / A converter may be provided as necessary.

Next, the simulated applied voltage-simulated capacitance current conversion circuit 3 will be described. When the electrostatic capacity of the zinc oxide type arrester is C, the electric charge stored in the capacitor is Q, and the simulated applied voltage is V ₁ , Formula 1 is established. Since the current I _C1 corresponding to the capacitance flowing in the capacitor is the electric charge flowing in a unit time,
Can be obtained by Q = CV ₁ (1) I _C1 = dQ / dt = CdV ₁ / dt (2)

As described above, when the simulated applied voltage 1a of the simulated applied voltage generating circuit 1 is input to the simulated applied voltage-simulated capacitance current conversion circuit 3, the simulated capacitance current 3a that is established from the relation of the equation 2 is output. . Simulated resistance component current 2 obtained above
It is possible to output the simulated leakage current 4a from the simulated leakage current generation circuit of the lightning arrester by adding the vector of a and the vector of the simulated capacitance current 3a by the simulated leakage current output circuit 4.

Further, since the simulated leak current output circuit 4 performs the addition operation of the vectors, the simulated applied voltage generating circuit 1 simulates the applied voltage-simulated resistance current conversion circuit 2 and the simulated applied voltage-simulated capacitance voltage conversion circuit 3. It does not need to be provided for each, and one is sufficient, and the phase difference between the vector of the simulated resistance component current 2a and the simulated capacitance component current 3a is also simulated. Furthermore, since a zinc oxide element is modeled as a lightning arrester, it can be applied to a leakage current detection device for a zinc oxide arrester.

Next, the inspection device for the arrester leakage current detection device will be described. In FIG. 1, reference numeral 6 denotes a simulated resistance component current 2a output from the simulated applied voltage-simulated resistance component current conversion circuit 2 and a resistance component current 7a obtained by a lightning arrester leakage current detection device 7 similar to that shown in FIG. Is a comparison means for comparing. A simulated leak current 4 a from the simulated leak current output circuit 4 and an applied voltage 1 a from the simulated applied voltage generating circuit 1 are input to the arrester leak current detection device 7. When the simulated leakage current 4a and the simulated applied voltage 1a are input, the resistance component current 7a can be obtained from the lightning arrester leakage current detection device 7 in the same manner as described above. The leakage current 7a and the simulated resistance voltage 2a obtained from the simulated applied voltage-simulated resistance current conversion circuit 2 are input to the comparison circuit 6 so that the resistance current 7a and the simulated resistance current 2a can be compared. Minute current 2
The average value of the positive half-wave of a is calculated and compared. Comparison means 6
As described above, the one in which the resistance component current 7a and the simulated resistance component current 2a are input and compared is described. However, the simulated resistance component current 2a is instructed to the simulated resistance component current indicator,
An observer may compare the measured values of the simulated resistance indicator and the resistance indicator of the arrester leakage current detection device 7. further,
Since the inspection device for the leakage current detection device of the lightning arrester can be configured by an electronic circuit, the inspection device for the leakage current detection device of the lightning arrester can be configured in a small size and can be easily carried.

As a conventional example of the lightning arrester leakage current detecting device, the device for detecting the applied voltage and the leakage current to the lightning arrester has been shown. However, there is a lightning arrester leakage current detecting device for detecting only the leakage current. For example, it is shown in the proceedings of the National Conference of the Institute of Electrical Engineers of Japan (S.62 No 1263). When inspecting the performance of such a lightning arrester leakage current detection device, only the simulated leakage current component may be applied to the lightning arrester leakage current detection device.

Example 2. A simulated leakage current generation circuit for a lightning arrester, which is another embodiment of the present invention, will be described. FIG.
FIG. 4 is a configuration diagram of a simulated leakage current generation circuit of a lightning arrester including harmonics. In FIG. 4, 1A is a sine wave voltage generating circuit that generates a commercial frequency sine wave voltage 1A1, 1B is a harmonic voltage generating circuit that generates a harmonic voltage 1B1, and 1C is a sine wave voltage 1A1 and a harmonic voltage 1B1. Together with this, it is a harmonic voltage adding circuit that outputs a simulated applied voltage 1b.
1 is a sine wave voltage generation circuit 1A, a harmonic voltage generation circuit 1B
And a harmonic applied voltage generating circuit 1C, which outputs a simulated applied voltage 1b simulating the applied voltage to the zinc oxide surge arrester. This has a configuration in which a harmonic voltage generating circuit 1B and a harmonic voltage adding circuit 1C are added to FIG.

Next, the operation will be described. A sine wave voltage 1A1 from the sine wave voltage generating circuit 1A and an output voltage 1B1 from the harmonic voltage generating circuit 1B are combined with a harmonic voltage adding circuit 1C.
, The simulated applied voltage 1b including the harmonic component is output. When the simulated applied voltage 1b is input to the simulated applied voltage-simulated resistance current conversion circuit 2 and the simulated applied voltage-simulated capacitance current conversion circuit 3, the simulated resistance current 2b and the simulated capacitance current are processed in the same manner as in the first embodiment. 3b is output respectively. These simulated resistance component current 2b and simulated capacitance component current 3b
The leakage current output circuit 4 performs a vector addition operation on the above to obtain a simulated leakage current 4b. In this way, the simulated leakage current 4b in the case where the applied voltage contains harmonic components is obtained.

The applied voltage applied to the lightning arrester, so-called system voltage, may contain harmonic components. As described above, it is possible to generate the simulated applied voltage 1b that simulates the applied voltage when the system voltage includes harmonics, and generate the simulated leakage current 4b that includes the harmonics.
Further, by operating the harmonic voltage 1B, the harmonic voltage 1B1
When the simulated leakage current 4b and the simulated applied voltage 1b are input to the surge arrester leakage current detection device (not shown), the harmonic voltage 1B1 is generated when the surge voltage is generated and when the harmonic voltage 1B1 is not generated. In some cases, it is possible to confirm whether the arrester leakage current detection device is operating properly. Further, if the comparison means is provided as in the first embodiment, it is possible to configure the inspection device for the lightning arrester leakage current detection device even when the higher harmonic wave 1B1 is generated.

Example 3. A leakage current generating circuit for a lightning arrester, which is another embodiment of the present invention, will be described. FIG. 5 is a configuration diagram of a leakage current generation circuit of a lightning arrester including overvoltage. In FIG. 5, 1A is a sine wave voltage generation circuit that generates a commercial frequency sine wave voltage 1A1, 1D is an overvoltage generation circuit that generates an overvoltage 1D1, and 1E is a sine wave voltage 1A1 and an overvoltage 1D1 that are added together with a simulated applied voltage 1c. It is an output overvoltage addition circuit. 1 is a sine wave voltage generation circuit 1
A is a simulated applied voltage generation circuit that is configured by an overvoltage generation circuit 1D and an overvoltage addition circuit 1E and outputs a simulated applied voltage 1c that simulates the applied voltage to the zinc oxide surge arrester.
This has a configuration in which an overvoltage generation circuit 1D and an overvoltage addition circuit 1E are added to FIG. Here, the overvoltage is generated by an operation other than the steady operation such as a lightning surge, a switching surge, or an AC overvoltage applied to the system voltage. These phenomena are generally known phenomena in the electric power system, and the overvoltage generation circuit 1D is configured to generate a voltage corresponding to these phenomena.

Next, the operation will be described. Sine wave voltage 1A1 from sine wave voltage generation circuit 1A and overvoltage generation circuit 1
When the output voltage 1D1 from D is input to the overvoltage addition circuit 1E, the simulated applied voltage 1c including the overvoltage is output. This simulated applied voltage 1c is converted into a simulated applied voltage-simulated resistance current conversion circuit 2 and a simulated applied voltage-simulated capacitance current conversion circuit 3
Input to the simulated resistance component current 2 as in the first embodiment.
c and the simulated capacitance current 3c are output respectively. The simulated leakage current 4c is obtained by adding the vectors of the simulated resistance component current 2c and the simulated capacitance component current 3c by the leakage current output circuit 4. In this way, the simulated leakage current 4c when the applied voltage includes an overvoltage is obtained.

The applied voltage applied to the lightning arrester, so-called system voltage, may include an overvoltage component. As described above, it is possible to generate the simulated applied voltage 1c that simulates the applied voltage when the system voltage includes the overvoltage, and to generate the simulated leakage current 4c that includes the overvoltage.
Further, if the comparison means is provided as in the first embodiment, the inspection device for the lightning arrester leakage current detection device can be configured even when the overvoltage 4c occurs.

Example 4. A simulated leakage current generation circuit for a lightning arrester, which is another embodiment of the present invention, will be described. FIG. 6 is a block diagram showing the configuration of a simulated leakage current generation circuit of a lightning arrester. In FIG. 6, reference numeral 1 denotes a third harmonic sine wave voltage generation circuit 1F that generates a third harmonic 1F1, and a third harmonic 1
A sine wave of a simulated applied voltage that is configured by a trigger generation circuit 1G that generates a trigger signal 1G1 in synchronization with the signal of F1 and a sine wave voltage generation circuit 1A that generates a sine wave voltage 1d and simulates the applied voltage applied to the arrester. Component 1d and the simulated applied voltage generating circuit for generating the third harmonic component 1F1 of the simulated applied voltage, and 2 inputs the sine wave component 1d of the simulated applied voltage and amplitude-converts the sine wave component 2A1 of the simulated resistance component current. Variable amplitude circuit 2A to obtain, third harmonic component 1 of simulated applied voltage
The amplitude variable circuit 2B which obtains the third harmonic component 2B1 of the simulated resistance component current by inputting F1 and the amplitude conversion and the sine wave component 2A1 of the simulated resistance component current and the third harmonic component 2B1 of the simulated resistance component current are added. Then, a simulated applied voltage-simulated resistance component current conversion circuit configured by an adder circuit 2C for outputting a simulated resistance component current 2d to obtain a simulated resistance component current 2d from the simulated applied voltage, 3 is a phase of a sine wave component 1d of the simulated applied voltage. 90 degree phase advance circuit 3A for outputting 90 degree advance signal 3A1 advanced by 90 degrees and amplitude variable circuit 3B for obtaining simulated capacitance component current 3d by inputting 90 degree advance signal 3A1 and amplitude conversion
The simulated applied voltage-simulated capacitance current conversion circuit 4 which obtains the simulated capacitance component current 3d from the sine wave component 1d of the simulated applied voltage, 4 adds the simulated resistance component current 2d and the simulated capacitance component current 3d, and simulate leakage current 4d is a simulated leakage current output circuit, which includes a simulated applied voltage generation circuit 1, a simulated applied voltage-simulated resistance component current conversion circuit 2, a simulated applied voltage-simulated capacitance component current conversion circuit 3 and a simulated leakage current output circuit 4. The simulated leakage current generation circuit of is constructed.

Here, the amplitude variable circuits 2A, 2B and 3B are used.
There is a method of obtaining a desired output voltage or a desired output current by changing the input voltage using a variable resistor and changing the size of the variable resistor. Further, as another method, an input voltage is amplified by an amplifier such as an operational amplifier, and a desired output voltage or a desired output current can be obtained by appropriately selecting a combination of resistors.

Further, in the region of FIG. 12B, that is, in the region where the resistance characteristic of the zinc oxide type arrester shows non-linearity, when the sine wave voltage of the commercial frequency is applied to the lightning arrester, the current I becomes other than the commercial frequency. The odd harmonics appear at. This harmonic component appears significantly when the applied voltage V becomes maximum, and especially the third component
The highest harmonic component. Therefore, here is the third
The description will be given only for the harmonic component.

First, the case of the area a in FIG. 12 in which the harmonic component does not appear will be described. At this time, since the third harmonic wave 1F1 is not generated, the third harmonic sine wave voltage generation circuit 1F, the trigger generation circuit 1G, and the amplitude variable circuit 2B.
The simulated leakage current generator of the lightning arrester is configured so that it does not operate. FIG. 7 shows waveforms of simulated applied voltage, simulated resistance component current, simulated capacitance component current, and simulated leakage current in the leakage current generation circuit of the lightning arrester when harmonic components do not appear. The waveform of the simulated applied voltage 1d from the circuit 1, (b) is the waveform of the simulated applied voltage-simulated resistance current 2d from the simulated resistance current conversion circuit 2, (c)
Is a waveform of the simulated applied voltage-simulated capacitive current conversion circuit 3 of the simulated capacitive current 3d, and (d) is a waveform of the simulated leak current 4d of the simulated leak current output circuit 4.

By passing the commercial frequency sine wave voltage 1d, which is a simulated applied voltage simulating the applied voltage to the lightning arrester, through the 90-degree phase advance circuit 3A and the amplitude variable circuit 3B, the 90-degree phase becomes greater than the simulated applied voltage 1d. Simulated capacity current 3d
Is obtained. Here, if the applied voltage V applied to the lightning arrester and the electrostatic capacitance C of the lightning arrester are constant, the value of the simulated capacitance current 3d is almost constant regardless of the deterioration of the lightning arrester. Therefore, assuming that the applied voltage 1d is V and the commercial frequency of the applied voltage V is f, the magnitude of I _C can be obtained by the mathematical formula 3 if the simulated capacitance current 3d is I _C. I _C = 2πfCV (3) The amplitude variable circuit 3B is adjusted so that the simulated capacitance current 3d corresponds to the value of Expression 3. Further, by passing the simulated applied voltage 1d of the simulated applied voltage generation circuit 1 through the amplitude variable circuit 2A, the simulated resistance component current 2d in phase with the simulated applied voltage can be obtained. Since the simulated resistance component current 2d is several μA to several tens μA in the normal ground voltage, the amplitude variable circuit 2A is adjusted so that the simulated resistance component current 2d also corresponds to this.

When the arrester deteriorates, the resistance component current 2d increases as shown by the dotted lines C ₁ and C ₂ in the region of FIG. 12A. Therefore, the amplitude variable circuit 9 increases the simulated resistance component current 2d. Try to keep going. As described above, the simulated leakage current output circuit 4 adds the simulated capacitance component current 3d and the simulated resistance component current 2d to obtain the commercial frequency simulated leakage current 4d. In this way, the simulated applied voltage 1d and the simulated leakage current 4d can be obtained in the region a of FIG. 12, that is, in the region where the resistance characteristics of the zinc oxide arrester are almost linear.

Next, the region b in FIG. 12 where the harmonic components appear
The case will be described. FIG. 8 shows a simulated applied voltage in the leakage current generation circuit of the lightning arrester when a harmonic component appears,
The waveforms of the trigger signal, simulated resistance component current, simulated capacitance component current, and simulated leakage current waveform are shown. (E) shows the third harmonic component 1F1 of the simulated applied voltage from the third harmonic sine wave voltage generation circuit 1F. Waveform, (f) is the waveform of the trigger signal 1G1 from the trigger generation circuit 1G, (g) is the sine wave voltage generation circuit 1
The waveform of the sine wave component 1d of the simulated applied voltage from A, (h) the waveform of the third harmonic component 2B1 of the simulated resistance component current from the amplitude variable circuit 2B, (i) the simulated leakage from the amplitude variable circuit 2A Waveform of current sine wave component 2A1, (j) is addition circuit 2C
Of the simulated resistance component current 2d, (k) is the waveform of the simulated capacitance component current 3d from the amplitude variable circuit 3B, and (l) is the waveform of the simulated leakage current 4d from the simulated leakage current generation circuit 4.

The third harmonic component 1F1 of the simulated applied voltage from the third harmonic sine wave voltage generating circuit 1F is input to the trigger generating circuit 1G. Commercial frequency sine wave voltage generator 1A
Then, the sine wave component 1d of the simulated applied voltage is output in synchronization with the trigger signal 1G1 of the trigger generation circuit 1G. Also,
By passing the third harmonic wave component 1F1 of the simulated applied voltage of the sine wave voltage generation circuit 1F for the third harmonic wave through the amplitude variable circuit 2B, the third harmonic wave component 2B1 of the simulated resistance current is obtained.
By adding the sine wave component 2A1 of the simulated resistance component current obtained by the amplitude variable circuit 2A and the third harmonic component 2B1 of the simulated resistance component current by the addition circuit 2C, the simulated resistance component current 2d containing the third harmonic component. Is obtained. Further, by the same method as described above, the simulated capacitance current 3d is obtained,
A simulated leakage current 4d can be obtained from the simulated resistance component current 2d and the simulated capacitance component current 3d. In this way, FIG.
It is possible to obtain the simulated applied voltage 1d and the simulated leakage current 4d in the region b, that is, in the region where the resistance characteristics of the zinc oxide arrester show non-linearity. As described above, the simulated applied voltage 1d and the simulated leakage current 4d can be obtained as in the first embodiment by appropriately adjusting the current or voltage value output by the amplitude variable circuits 2A, 2B, 3B.

[0041]

As described above, the inspection device for the arrester leakage current detecting device according to the present invention is provided with the resistance component which is the output from the arrester leakage current detecting device for inputting the simulated leakage current or the simulated leakage current and the simulated applied voltage. Since it is composed of a current and a simulated applied voltage-simulated resistance component current output from the simulated resistance component current conversion circuit, it is possible to easily perform a periodic performance inspection of the surge arrester leakage current detection device, and to prevent a surge arrester leakage. The reliability of the current detection device is improved and the inspection device can be configured with an electronic circuit, so that it can be easily carried.

Further, the simulated leakage current generating circuit of the lightning arrester according to the present invention includes a simulated applied voltage generating circuit for outputting a simulated applied voltage and a simulated applied voltage-simulated resistance for outputting a simulated resistance component current according to the simulated applied voltage. Since it is composed of a split current conversion circuit, a simulated applied voltage-simulated capacitance current conversion circuit that outputs a simulated capacitance partial current according to the simulated applied voltage, and a simulated leakage current output circuit that outputs a simulated leakage current, simulated application By changing the voltage or changing the simulated applied voltage-simulated resistance component, the conversion characteristics of the current conversion circuit can be varied to generate simulated leakage current under various conditions, and the simulated resistance component current and simulated capacitance component can be calculated in consideration of the phase difference. Since a current is output, only one simulated applied voltage is needed and the configuration can be simplified.

Further, since the simulated applied voltage is obtained by adding the sine wave voltage and the harmonic voltage, it is possible to simulate the case where the power system includes the harmonic voltage and to perform the performance inspection of the arrester leakage current detecting device. You can

Further, since the simulated applied voltage is obtained by adding the sine wave voltage and the overvoltage, it is possible to simulate the case where the power system includes the overvoltage and to perform the performance inspection of the arrester leakage current detecting device.

Further, since the lightning arrester element of the lightning arrester is formed of a zinc oxide element having a non-linear resistance characteristic, it is possible to generate a simulated leakage current for the zinc oxide type lightning arrester and a lightning arrester leakage current detecting device used in the zinc oxide type lightning arrester. Can be inspected.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an inspection device for a lightning arrester leakage current detection device that is an embodiment of the present invention.

FIG. 2 shows a resistance characteristic showing a simulated resistance component current when a simulated applied voltage is applied to the zinc oxide type arrester according to the present invention, which is divided into three areas, and the resistance characteristics in each area are modeled by linear approximation. FIG.

FIG. 3 is a diagram showing a case where a simulated applied voltage-simulated resistance current conversion circuit according to the present invention is configured by an analog logic circuit.

FIG. 4 is a configuration diagram of a leakage current generating circuit of a lightning arrester including harmonics according to another embodiment of the present invention.

FIG. 5 is a configuration diagram of a leakage current generating circuit of a lightning arrester including an overvoltage according to another embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a leakage current generating circuit of a lightning arrester which is another embodiment of the present invention.

FIG. 7 is a diagram showing simulated applied voltage, simulated resistance component current, simulated capacitance component current, and simulated leakage current waveform in the leakage current generating circuit of the lightning arrester when the harmonic component does not appear according to the present invention.

FIG. 8 is a diagram showing simulated applied voltage, trigger signal, simulated resistance component current, simulated capacitance component current and simulated leakage current waveform in the leakage current generation circuit of the lightning arrester when a harmonic component according to the present invention appears.

FIG. 9 is a diagram showing an electrical equivalent circuit of a conventional zinc oxide arrester, in which a resistor and a capacitor are connected in parallel.

FIG. 10 is a vector diagram of a commercial frequency of an applied voltage, a resistance component current, a capacitance component current, and a leakage current when an applied voltage is applied to a conventional zinc oxide surge arrester.

FIG. 11 is a diagram showing waveforms of an applied voltage, a resistance component current, a capacitance component current, and a leakage current when an applied voltage is applied to a conventional zinc oxide surge arrester.

FIG. 12 is a diagram showing voltage-resistance current characteristics of a zinc oxide element which is a lightning arrester of a conventional zinc oxide type lightning arrester.

FIG. 13 is a block diagram showing the principle of a conventional zinc oxide surge arrester leakage current detection device.

FIG. 14 is a diagram showing applied voltage, leakage current and resistance component current waveforms in a conventional arrester leakage current detection device.

[Explanation of symbols]

1 simulated applied voltage generating circuit, 1A sine wave voltage generating circuit, 1A1 sine wave voltage, 1B harmonic voltage generating circuit, 1B1 harmonic voltage, 1C harmonic voltage adding circuit,
1D overvoltage generation circuit, 1E overvoltage addition circuit, 1
D1 overvoltage, 1a, 1b, 1c, 1d simulated applied voltage, 2 simulated applied voltage-simulated resistance current conversion circuit, 2
a, 2b, 2c, 2d simulated resistance component current, 3 simulated applied voltage-simulated capacitance component current conversion circuit, 3a, 3b, 3c, 3
d simulated capacitance current, 4 simulated leakage current output circuit, 4
a, 4b, 4c, 4d simulated leakage current, 5 simulated leakage current generation circuit of lightning arrester, 6 comparison means, 7 arrester leakage current detection device, 7a resistance component current

Claims (5)

[Claims] 1. A simulated applied voltage generating circuit for generating a simulated applied voltage simulating an applied voltage applied to a lightning arrester formed electrically equivalent to a circuit in which a resistor and a capacitor are connected in parallel, and the simulated applied voltage generation. A simulated applied voltage-simulated resistance current conversion circuit for obtaining a simulated resistance component current flowing in the resistance component of the lightning arrester from the signal input from the circuit, and a capacitance component of the lightning arrester from the signal input from the simulated applied voltage generation circuit. Input to simulated lightning voltage-simulated capacitance current conversion circuit for obtaining flowing simulated capacitance current, simulated leakage current output circuit for obtaining simulated leakage current from the simulated resistance component current and simulated capacitance component current, and lightning arrester leakage current detection device Resistance leakage current of the arrester leakage current detection device obtained based on the simulated leakage current or the simulated leakage current and the simulated applied voltage, and the simulated resistance distribution An inspection device for a lightning arrester leakage current detection device, comprising: a comparison means for comparing currents. 2. A simulated applied voltage generation circuit for generating a simulated applied voltage simulating an applied voltage applied to a lightning arrester formed electrically equivalent to a circuit in which a resistor and a capacitor are connected in parallel, and the simulated applied voltage generation. A simulated applied voltage-simulated resistance current conversion circuit for obtaining a simulated resistance component current flowing in the resistance component of the lightning arrester from the signal input from the circuit, and a capacitance component of the lightning arrester from the signal input from the simulated applied voltage generation circuit. A simulated applied voltage-simulated capacitance current conversion circuit for obtaining a flowing simulated capacitance current, and a simulated leakage current output circuit for obtaining a simulated leakage current from the simulated resistance component current and the simulated capacitance component current. Simulated leakage current generation circuit of lightning arrester. 3. A simulated applied voltage generating circuit, wherein the sine wave voltage generating circuit generates a sine wave voltage, the harmonic voltage generating circuit generates a harmonic voltage, and the harmonic voltage is added to the sine wave voltage. A harmonic voltage adding circuit for obtaining a simulated applied voltage to be applied to a lightning arrester according to claim 1 or 2, wherein the lightning arrester leakage current detecting device inspection device or the lightning arrester simulated leakage current generating circuit is provided. 4. The simulated applied voltage generation circuit adds a sine wave voltage generation circuit that generates a sine wave voltage, an overvoltage generation circuit that generates an overvoltage, and adds the overvoltage to the sine wave voltage and applies the surge arrester. 3. An inspection device for a lightning arrester leakage current detection device or a simulated leakage current generation circuit for a lightning arrester according to claim 1, further comprising an overvoltage adding circuit for obtaining a simulated applied voltage. 5. A lightning arrester element of a lightning arrester is a zinc oxide element having a non-linear resistance characteristic.
An inspection device for a lightning arrester leakage current detection device according to claim 4, or a simulated leakage current generation circuit for a lightning arrester.