JP2004037169A - Operation monitoring apparatus of lightning arrester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately determine the deterioration state of a lightning arrester by integrating lighting strike current energy passing through a specific lightning arrester and comparing the value with a specific threshold continuously for a long time. <P>SOLUTION: A current detector 21 made of an air-core toroidal coil is fitted to a grounding conductor 13 in the lightning arrester 10. An operation monitoring apparatus 20 performs the operation of electric energy flowing to the lightning arrester due to thunder surge for one time for transmitting to a host computer. The accumulation value of electric energy flowing to the lightning arrester allows the degree of deterioration of the lightning arrester to be estimated. The operation monitoring apparatus 20 is mounted extremely close to the lightning arrester 10. Drive power is supplied by a solar cell panel 25 and a battery box 26. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lightning arrester operation monitoring device that is frequently used in power equipment.
[0002]
[Prior art]
Lightning arresters play a very important role as equipment for protecting power transmission and distribution equipment and substation equipment from lightning damage. For example, large substations are fitted with a number of lightning arresters to protect critical electrical equipment. These surge arresters conduct under abnormal voltage due to lightning surge and discharge the lightning current, keeping the voltage applied to the equipment below the protection level. Although lightning arresters are used in such harsh environments, once the lightning arrester fails, the power equipment to be protected will be damaged, so its maintenance and soundness check are important tasks. Therefore, a technology has been developed for observing the leakage current of the lightning arrester in normal times and diagnosing the deterioration of the built-in nonlinear resistance element (Japanese Patent Laid-Open No. 2000-321318). Further, a technology has been developed in which a change in the terminal voltage of the lightning arrester during lightning is detected, the number of lightning strikes is counted, and the degree of deterioration of the lightning arrester is estimated from the number of protection operations (Japanese Patent Laid-Open No. 2001-23479).
[0003]
[Problems to be solved by the invention]
By the way, the conventional techniques as described above have the following problems to be solved.
What is obtained by the leakage current measurement of the surge arrester under normal conditions is the static characteristic, not the dynamic characteristic during the protection operation. It is difficult to accurately estimate the dynamic characteristics from the static characteristics of the surge arrester. On the other hand, the lightning arrester absorbs a large amount of energy during the protection operation. Therefore, if the number of protection operations increases, the lightning arrester deteriorates. It is only necessary to be able to directly measure the dynamic characteristics, but an economical and practical technique for directly observing and recording the effect of a lightning surge on an arrester has not been introduced. Even if the number of protection operations exceeds a certain number, there is a large variation in the degree of deterioration of each lightning arrester.
SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide an operation monitor of an arrester capable of constantly monitoring the operation state of the arrester and collecting information suitable for the deterioration diagnosis.
Another object of the present invention is to provide a surge arrester operation monitoring device that measures current energy flowing through the surge arrester during a protection operation of the surge arrester and accurately determines a deterioration state thereof.
[0004]
[Means for Solving the Problems]
The present invention solves the above problem by the following configuration.
<Configuration 1>
A detector for detecting a current flowing through a ground wire of the lightning arrester, a means for processing an instantaneous value of the power passing through the lightning arrester from an output signal of the detector, and a lightning surge for at least one time based on a result of the calculation processing. Means for arithmetically processing the electric energy passing through the lightning arrester according to claim 1.
[0005]
<Configuration 2>
2. The operation monitoring device for a lightning arrester according to claim 1, further comprising means for transmitting the information on the electric energy to the outside at a predetermined timing.
[0006]
<Configuration 3>
The operation monitoring device for a lightning arrester according to Configuration 1, further comprising a display device that receives the information on the electric energy and calculates and displays a cumulative value of the electric energy since the lightning arrester started to be used. Characteristic lightning arrester operation monitoring device.
[0007]
<Configuration 4>
A detector for detecting a current flowing through a ground wire of the arrester; and a means for calculating, based on an output signal of the detector, a time integration value of a current passing through the arrester by at least one lightning surge. A lightning arrester operation monitoring device.
[0008]
<Configuration 5>
5. The operation monitoring device for an arrester according to claim 4, further comprising means for transmitting information on the time integral of the current to the outside at a predetermined timing.
[0009]
<Configuration 6>
In the operation monitoring device for a lightning arrester according to Configuration 4, means for receiving information on the time integral value of the current and arithmetically processing electric energy that has passed through the lightning arrester by one lightning surge; An operation monitoring device for a lightning arrester, comprising: a display device for calculating and displaying a cumulative value of the electric energy from the start.
[0010]
<Configuration 7>
A detector for detecting a current flowing through the ground wire of the lightning arrester, a means for measuring a leakage current flowing through the lightning arrester from an output signal of the detector, a means for digitally converting the measured leakage current value and transmitting a radio wave, An operation monitoring device for a lightning arrester, comprising a display device for receiving and displaying the leakage current value transmitted by radio waves.
[0011]
<Configuration 8>
A detector for detecting a current flowing through the grounding wire of the lightning arrester, a multiplying circuit for calculating an instantaneous value of the power passing through the lightning arrester from an output signal of the detector and a terminal voltage of the lightning arrester; An integration circuit that performs time integration to calculate and process electric energy that has passed through the lightning arrester due to at least one lightning surge; a circuit that holds a peak value of an output of the integration circuit for a predetermined time; A circuit for converting the peak value of the output into a digital signal to obtain data for monitoring the operation of the lightning arrester.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described using specific examples.
FIG. 1A is a substantial wiring diagram showing a specific example of a lightning arrester operation monitoring device of the present invention.
The lightning arrester 10 is used by connecting a terminal 11 to a terminal on a high voltage side of a power device (not shown) and a terminal 12 to a terminal on a ground side. The terminal 12 is grounded by a ground line 13. A detector 21 is connected to an operation monitoring device 20 whose internal function will be described later. The detector 21 is mounted so as to penetrate the ground wire 13.
[0013]
1B and 1C are internal wiring diagrams illustrating an example of the detector 21. FIG.
The operation monitoring apparatus of the present invention uses an air-core toroidal coil as shown in FIGS. FIG. 1B shows a very common air-core toroidal coil in which terminals 24A and 24B are provided in a toroidal coil portion 23. A ground line 13 is arranged to pass through the center. As a result, an induced current caused by a current flowing through the ground line 13 flows through the toroidal coil portion 23. This induced current is taken out from the terminals 24A and 24B and measured as a current flowing through the arrester 10.
[0014]
On the other hand, the one shown in (c) is a so-called Rogowski type toroidal coil. In this coil, the lead wire of the terminal 24 </ b> A is arranged so as to penetrate the core of the toroidal coil portion 23. The Rogowski type current detector is also a general air-core toroidal coil. It has almost the same function. However, in the Rogowski type coil, as shown in the figure, a gap can be provided in the portion (c), and the detector 21 can be attached to the ground wire 13 without removing the ground wire 13 from the terminal 12 or the ground end. effective.
[0015]
The detector having any of the above configurations (b) and (c) does not have magnetic cores and thus does not cause magnetic saturation, and can faithfully output the alternating current waveform flowing through the ground line 13 to the terminals 24A and 24B. The operation monitoring device 20 as described above can be manufactured to be sufficiently small, and is mounted immediately near the lightning arrester 10. In addition, since it is attached to a place where it is difficult to take power, it is preferable to supply driving power by the solar cell panel 25 and the battery box 26. From the battery box 26, power can be simultaneously supplied to a plurality of other operation monitoring devices.
[0016]
When a lightning strike occurs, a steep lightning current that reaches a maximum of about 10,000 amps (A) flows through the ground wire 13 of the lightning arrester 10 within 50 microseconds. If this is to be taken out using a normal through-type current transformer, an accurate current waveform cannot be observed on the output side due to magnetic saturation and hysteresis of the magnetic core. Further, when the feedthrough type current transformer is mounted on the ground wire of the lightning arrester, it is necessary to temporarily remove the ground wire from the ground terminal, so that work cannot be performed in a live state to prevent danger.
[0017]
In the device of the present invention, the detector 21 made of an air-core toroidal coil is mounted on the ground wire 13 of the lightning arrester 10. The air-core toroidal coil does not have magnetic saturation and can obtain excellent linearity input / output characteristics even when the primary current is about 10,000 amperes. In addition, a sufficiently small safe level of output current can be obtained as an input to the measurement circuit. Further, it has a frequency characteristic capable of responding to a signal of a high frequency component reaching from the zero value to the peak value point within several microseconds. Thus, for example, the lightning arrester 10 and the operation monitoring device 20 can be attached to many power devices in a substation and operated.
[0018]
FIG. 2 is a block diagram showing a specific circuit configuration of the arrester operation monitoring device of the present invention.
The lightning arrester 10 shown in the figure is provided with the ground wire 13 as described above, and the detector 21 is mounted here. The output of the detector 21 is input to the integration circuit 30. In addition to the integration circuit 30, the apparatus includes a multiplication circuit 31, an integration circuit 32, a reset circuit 33, a peak hold circuit 34, an A / D conversion circuit 35, and a transmission circuit 36. 3 and 4 show specific connection diagrams of these circuits. The integration circuit 30 shown in FIG. 2 is connected as shown in FIG.
[0019]
3A, a signal output from an output terminal 41 of the detector 21 is time-integrated by an integrating circuit including an operational amplifier as shown in FIG. Since the integration circuit itself is known, a detailed description is omitted, but a waveform signal corresponding to the current flowing through the ground line 13 is output to the output terminal 42. This signal is output to the multiplication circuit 31. Note that the circuit configuration and circuit constant of the integration circuit 30 may be set arbitrarily as long as they have a desired function. The same applies to each circuit shown in FIGS. In the figure, A is an operational amplifier, R is a resistor, VR is a variable resistor, C is a capacitor, TR is a transistor, and D is a diode.
[0020]
The multiplication circuit 31 shown in FIG. 2 has a circuit configuration as shown in FIG.
As shown in this figure, a constant voltage signal V corresponding to the terminal voltage of the surge arrester is input to one input terminal 43 of the multiplication integrated circuit. Further, the output signal of the integration circuit 30 shown in (a) is input to the other input terminal 44 of the multiplication circuit. An i × V signal corresponding to the product of the two is output to the output terminal 45 of the multiplication circuit. That is, the instantaneous power flowing through the lightning arrester 10 is obtained by the multiplying circuit 31.
[0021]
The integration circuit 32 shown in FIG. 2 is a circuit that integrates the output signal of the multiplication circuit 31 with time and calculates the energy of one lightning surge flowing through the lightning arrester 10. This has a circuit configuration as shown in FIG. The left half of this circuit is an integration circuit, and the right half is an inversion circuit. These circuits are also very common connections, and detailed description is omitted. A value obtained by integrating the signal input to the terminal 46 for a certain period is output to the terminal 47. The inverting circuit is provided for adjusting the polarity of the output terminal 48 to the polarity on the output side. The output of the integrating circuit 32 is simultaneously output to the reset circuit 33 and the peak hold circuit 34.
[0022]
The peak hold circuit 34 is connected as shown in FIG.
This diagram is also a very general circuit, but holds the maximum value of the signal input to the terminal 51 for a certain period of time. When the reset signal is input to the terminal 53, the held value is cleared. The held peak value is output to the terminal 52. This is output to the A / D conversion circuit 35 in FIG. 2, becomes a digital signal, and is wirelessly transmitted through the transmission circuit 36. The peak hold circuit 34 can notify the receiving side of the energy of one lightning surge that has flowed into the lightning arrester 10.
[0023]
If the output signal of the integration circuit 32 is left undisturbed, it gradually discharges and decreases over time. The peak hold circuit 34 has a function of maintaining the output level while the A / D converter 35 digitally converts the peak value of the output of the integration circuit 32. The reset circuit 33 has a function of starting operation when a constant output is obtained from the integration circuit 32 and outputting a reset signal to the peak hold circuit 34 after measuring a fixed time. The reset circuit 33 clears the output of the peak hold circuit 34 at a predetermined timing after the digital conversion processing and the transmission processing, so that the output signal of the next integration circuit 32 can be accepted.
[0024]
As shown in FIG. 4B, the reset circuit 33 is divided into a comparator part and a timer part. The signal input from the terminal 54 is compared with a fixed reference value by a comparator, and when the reference value is exceeded, the timer 55 is started. Since there is no operation when there is no output from the integration circuit 32, wasteful power consumption is prevented. The one-shot multivibrator transmits a reset signal to the peak hold circuit a fixed time after the start. The lightning surge waveform has a length of about several tens of microseconds, and a period from the detection of the lightning surge to a predetermined arithmetic processing to the end of data transmission is defined as one cycle. This one cycle time is a fixed time set in the one-shot multivibrator. This fixed time is set to, for example, 0.6 seconds.
[0025]
In the above circuit, the detector (FIG. 1) including the air-core toroidal coil extracts a signal corresponding to a differential waveform of the primary current waveform by electromagnetic induction. The output signal of the air core toroidal coil is input to the integration circuit 30. In the present invention, the cumulative value of the electric energy flowing through the lightning arrester due to the lightning surge makes it possible to estimate the degree of deterioration of the lightning arrester. The circuit for obtaining the electric energy was connected to the output side of the air core toroidal coil. The output of the integration circuit 30 corresponds to the instantaneous current value i flowing through the ground wire of the surge arrester. On the output side of the integrating circuit 30, a multiplying circuit 31 for calculating the product iv of the output of the integrating circuit 30 and the terminal voltage v of the arrester is provided. The measured value of the terminal voltage of the lightning arrester 10 may be input to the terminal 43. However, since the terminal voltage v of the lightning arrester is substantially constant during the protection operation, a constant value corresponding to the multiplication coefficient signal of the multiplication circuit may be supplied without inputting the measured value. The output iv of the multiplication circuit 31 is a signal corresponding to the instantaneous power passing through the arrester.
[0026]
FIG. 5 is an explanatory diagram of a device that receives a signal transmitted from the operation monitoring device 20 shown in FIG.
For example, it is assumed that a large number of operation monitoring devices 20A, 20B, and 20C are provided as shown in the figure. From these, information indicating the value of the measured electric energy is transmitted by radio waves at an arbitrary timing after the observation of the lightning surge. This is received by the receiver 60. The signal received by the receiver 60 is processed by the host computer 61. As a result, as shown in the screen 62 of the figure, the detection time of the lightning surge and the value of the passed electric energy are displayed as a list for all the lightning arresters. Also, the accumulated value is displayed. This cumulative value is obtained by accumulating the electric energy flowing through the lightning arrester 10 immediately after the new installation of the lightning arrester 10. By comparing the accumulated values, it is possible to determine which lightning arrester has deteriorated and how much.
[0027]
FIGS. 6A and 6B are explanatory diagrams for demonstrating the specific operation of the detector 21 shown in FIG. 1, wherein FIG. 6A shows the operation characteristics for a rectangular wave, and FIG. 6B shows the operation characteristics for a triangular wave.
In each of the graphs shown in FIG. 6, the horizontal axis represents time and the vertical axis represents signal level. Ri is a current flowing through the ground line 13, i ′ is a differential waveform detected by the detector 21, and i is an output signal waveform of the integrating circuit 30. Regardless of whether a rectangular wave or a triangular wave is input, the output signal of the integration circuit 30 has a waveform that almost exactly reproduces the current flowing through the ground line 13. Since the rising portion of the lightning surge is close to a rectangular wave and the falling portion is close to a triangular wave, the purpose can be sufficiently achieved with this characteristic.
[0028]
FIG. 7 is an explanatory diagram of signal waveforms before and after the multiplication circuit 31 shown in FIG.
In each graph, the horizontal axis is the time axis. In the present invention, the current waveform of the current flowing through the lightning arrester 10 is detected by one lightning surge, the electric energy flowing through the lightning arrester 10 is calculated from this, and the result is transmitted. FIG. 7A shows a waveform of a current flowing through the lightning arrester 10 due to a lightning surge. The multiplication circuit 31 obtains a product of the current i and the voltage V as shown in FIG. When this is integrated, for example, by the time T, the electric energy E that has passed through the lightning arrester 10 is obtained. The time T is preferably set to an appropriate value in consideration of an error. The electric energy value E increases with time as shown in (c) of the figure, and decreases as the lightning surge disappears as shown by the broken line in (c). This maximum value is held in the peak hold circuit and is converted into a digital signal.
[0029]
In the above example, the electric energy flowing to the lightning arrester 10 was calculated on the operation monitoring device 20 side. However, for example, the time integral value of the current i flowing through the arrester 10 may be calculated, the result may be transmitted, and the receiving side may calculate the electric energy by multiplying by a value corresponding to the voltage. In this case, the circuit configuration of the operation monitoring device 20 can be further simplified. In any case, since the result of calculating the current or the like that has passed through the arrester by one lightning surge is collectively transmitted, the high-speed data communication function is not required.
[0030]
Further, since the monitoring signals can be transmitted from the plurality of monitoring circuits to the host computer at sufficiently wide time intervals, the host computers can receive and process the signals without difficulty. In order to prevent collision of transmission signals, the host computer may periodically request each operation monitoring apparatus to transmit data in a polling manner. In addition, the operation monitoring device 20 may be configured to record and hold the time integral of the electric energy and the current obtained by performing the arithmetic processing in a memory or the like, and to read the integrated value by any means. Also, for example, a cumulative result may be transmitted to the host computer for several lightning surges instead of one. Further, if the analog circuit is used as described above, a general-purpose component can be combined to reduce the size at a low cost. For example, a part of the circuit is replaced with a digital circuit or a computer, and the same arithmetic processing is performed. You can also.
[0031]
Further, the operation monitoring device 20 may be provided with a display such as a liquid crystal display for displaying the result of the arithmetic processing. It is preferable to use radio waves to transmit the calculation result to the outside. Of course, the calculation result may be transmitted to the outside through a data communication cable such as an optical fiber. At the moment of a lightning strike, noise is intense and erroneous transmission of data is likely to occur. However, if the calculation result is transmitted after completion of the calculation processing, erroneous transmission can be reduced.
[0032]
FIG. 8 is a block diagram showing an embodiment of the device of the present invention in a more specific form.
In the above embodiment, the measurement result of the lightning surge flowing through the lightning arrester 10 was transmitted by radio waves, and the measurement result could be monitored by a host computer in a monitoring office or the like. In the high-voltage substation, lightning arresters are attached to the three RST phases, respectively, so that the above detectors 21R, 21S, and 21T are attached to the three lightning arresters 10R, 10S, and 10T. These outputs are input to the processing circuits 71R, 71S, 71T as described in FIG. The processing circuits 71R, 71S, and 71T are circuits that process the output signals of the detectors 21R, 21S, and 21T up to a state immediately before input to the A / D conversion circuit 35 shown in FIG. The contents may be as shown in FIG.
[0033]
Further, in this embodiment, not only the measurement of the lightning surge but also the measurement of the leakage current of the lightning arrester during normal times is performed. As shown in the figure, detectors 75R, 75S, and 75T formed of magnetic core-containing toroidal coils and amplification circuits 76R, 76S, and 76T that amplify the outputs of these detectors are provided. The toroidal coil containing the magnetic core has a split structure, and is suitable to be easily attached to the ground wire of the lightning arrester 10. The outputs of the processing circuits 71R, 71S, 71T and the outputs of the amplifiers 76R, 76S, 76T are both input to the A / D conversion circuit 80. The A / D conversion circuit 80 has six input terminals, and has a function of sampling an analog signal input to each input terminal at a predetermined sampling interval and converting it into a digital signal.
[0034]
On the output side of the A / D conversion circuit 80, a CPU 81 (arithmetic processing device), a memory 82, a clock circuit 83, and a communication control unit 84 are provided. The output signal of the A / D conversion circuit is edited by the CPU 81 and stored in the memory 82. In this type of monitoring device, the measurement time of data becomes a problem, so the CPU 81 is configured to acquire time data from the clock circuit 83. Data 91 and 92 stored in the memory 82 are shown in the upper right of the figure. The leakage current is stored as one data together with the measurement time. The energy is also stored as one data together with the measurement time. The communication control circuit 84 transmits the data 91 and 92 stored in the memory via the antenna 85 at a predetermined timing.
[0035]
It is sufficient that the leakage current of the lightning arrester 10 is measured and transmitted to the host computer every 10 minutes or 1 hour, for example. Therefore, it is preferable that the CPU 81 be activated at this interval to perform data sampling and transmission control. Thereby, a power saving effect can be expected when this device is driven using a solar cell or the like as a power supply. In addition, since the passing energy due to the lightning surge is measured when a lightning strike occurs, the CPU 81 may be started each time, and the operation may be automatically terminated when data transmission is completed after a predetermined time. Further, it is preferable to transmit the measurement result of the leakage current once or more at predetermined time intervals. For example, the result measured every 10 minutes may be stored in the memory for one hour and transmitted every other hour.
[0036]
It is preferable to store the measurement result of the passing energy due to the lightning surge in a memory and transmit the data when the lightning goes away. Thus, the transmission radio wave is not affected by the lightning noise. During the operation of the peak hold circuits of the processing circuits 71R, 71S, and 71T, the A / D conversion circuit 80 digitizes the output signal. When the operation of the peak hold circuit starts, that is, the signal at the start of the one-shot multivibrator described above is used as a trigger to start the CPU 81. After that, the CPU 81 may automatically switch to the standby mode (power saving mode) upon detecting the end of the necessary data transmission processing.
[0037]
In this way, the state of the arrester can be constantly monitored and its soundness can be maintained. The reason why the detectors 75R, 75S, and 75T made of a toroidal coil containing a magnetic core are provided is that the value of the leakage current is sufficiently smaller than that of the lightning surge, so that a current transformer having high sensitivity is used for the detector. . Further, at the time of lightning strike, the output of the toroidal coil containing the magnetic core is limited by the magnetic saturation, so that there is no possibility that a failure occurs in the amplifier circuit 72 or the like.
[0038]
【The invention's effect】
As described above, according to the present invention, data on how much electric energy has passed through the lightning arrester due to a lightning strike is obtained, so that the actual operation history of the lightning arrester can be monitored and the deterioration state can be quantitatively determined. For example, maintenance management can be performed such that the lightning current energy that has passed through a particular lightning arrester is integrated over a long period of time, the value is compared with a predetermined threshold, and the lightning arrester is replaced when the threshold is exceeded. In addition, an expensive current detector with a good response and a high-speed data transmission circuit are required to measure the current flowing in the lightning arrester in real time during a lightning strike and transmit the measured value as data. Since the lightning surge computes the energy that has passed through the lightning arrestor, stores the result in a circuit, and then transmits it, there is no need for a high-speed data communication function. In this case, the number of protection operations of the arrester can also be counted.
[Brief description of the drawings]
FIG. 1A is a substantial wiring diagram showing a specific example of an operation monitoring device for a lightning arrester of the present invention, and FIGS. 1B and 1C are internal wiring diagrams showing an example of a detector 21;
FIG. 2 is a block diagram showing a specific circuit configuration of an operation monitoring device for an arrester according to the present invention.
3A is a specific connection diagram of an integration circuit 30, FIG. 3B is a specific connection diagram of a multiplication circuit 31, and FIG. 3C is a specific connection diagram of an integration circuit 32.
4A is a specific connection diagram of a reset circuit 33, and FIG. 4B is a specific connection diagram of a peak hold circuit 34. FIG.
5 is an explanatory diagram of a device that receives a signal transmitted from the operation monitoring device 20. FIG.
6A and 6B are explanatory diagrams for demonstrating a specific operation of the detector 21, wherein FIG. 6A shows an operation characteristic for a rectangular wave, and FIG. 6B shows an operation characteristic for a triangular wave.
7 is an explanatory diagram of signal waveforms before and after a multiplication circuit 31. FIG.
FIG. 8 is a block diagram showing an embodiment of a more specific example of the apparatus of the present invention.
[Explanation of symbols]
Reference Signs List 10 lightning arrester 11, 12 terminal 13 ground wire 21 detector 20 operation monitoring device 25 solar cell panel 26 battery box 27 antenna 23 toroidal coil 24A, 24B output terminal

Claims (8)

A detector for detecting a current flowing through the grounding wire of the arrester;
Means for calculating the instantaneous value of the power passing through the lightning arrester from the output signal of the detector;
Means for arithmetically processing, from the result of the arithmetic processing, electric energy that has passed through the lightning arrester by at least one lightning surge, the operation monitoring apparatus for an arrester. The operation monitoring device for an arrester according to claim 1,
A device for monitoring the operation of a lightning arrester, comprising means for holding the information on the electric energy and transmitting the information to the outside at a predetermined timing. The operation monitoring device for an arrester according to claim 1,
An operation monitoring device for a lightning arrester, comprising: a display device that receives the information on the electric energy and calculates and displays a cumulative value of the electric energy since the lightning arrester started to be used. A detector for detecting a current flowing through the grounding wire of the arrester;
An operation monitoring device for a lightning arrester, comprising means for calculating a time integrated value of a current passing through the lightning arrester by at least one lightning surge from an output signal of the detector. The operation monitoring device for an arrester according to claim 4,
An operation monitoring device for an arrester, comprising: means for transmitting information on the time integral value of the current to the outside at a predetermined timing. The operation monitoring device for an arrester according to claim 4,
Means for receiving information on the time integral value of the current and calculating electric energy that has passed through the lightning arrester by one lightning surge;
An operation monitoring device for a lightning arrester, comprising: a display device for calculating and displaying a cumulative value of the electric energy since the lightning arrester started to be used. A detector for detecting a current flowing through the grounding wire of the arrester;
Means for measuring a leakage current flowing through the lightning arrester from an output signal of the detector;
Means for digitally converting the measured leakage current value and transmitting the electric wave,
An operation monitoring device for an arrester, comprising a display device for receiving and displaying the leak current value transmitted by radio waves. A detector for detecting a current flowing through the grounding wire of the arrester;
A multiplying circuit for calculating the instantaneous value of the power passing through the lightning arrester from the output signal of the detector and the terminal voltage of the lightning arrester;
An integration circuit that performs time integration of the instantaneous value of the power and performs arithmetic processing on electric energy that has passed through the lightning arrester by at least one lightning surge;
A circuit for holding a peak value of the output of the integration circuit for a predetermined time;
A circuit for converting the held peak value of the output of the integrating circuit into digital data to obtain operation monitoring data of the lightning arrester.

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