A circuit for monitoring the operation of a surge arrester

Abstract

The application provides a lightning arrester operation monitoring circuit, comprising a three-phase discharge counting module, a Hall current sensor module and an electromagnetic current sensor module. The three-phase discharge counting module comprises a lightning arrester and a counter. The input end of the lightning arrester is connected with the counter, a Hall current sensor in the Hall current sensor module and the input end of the electromagnetic current sensor module. The counter is grounded through a non-linear resistance submodule. The Hall current sensor module comprises a Hall current sensor, a signal amplifier, a power amplifier and a first monitoring module. The output end of the Hall current sensor is connected with the input end of the signal amplifier. The output end of the signal amplifier is connected with the input end of the power amplifier. The output end of the power amplifier is connected with the first monitoring module. The output end of the electromagnetic current sensor is connected with the input end of the signal amplifier. The output end of the power amplifier is connected with a second monitoring module of the electromagnetic current sensor.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic power generation technology; specifically, it relates to a surge arrester operation monitoring circuit. Background Technology

[0002] Currently, photovoltaic box-type high-voltage surge arresters mostly use the JS-8 type counter. The principle is as follows: Figure 2 As shown, it consists of a nonlinear resistor, an electromagnetic counter, and some electronic components. Under normal operating voltage, the leakage current flowing through the counter is small, and the counter does not operate. When the surge arrester is subjected to a lightning surge, a large current flows through the nonlinear resistor of the counter, and after DC-DC conversion, discharges to the electromagnetic coil, causing the electromagnetic counter to activate once, thus measuring the number of surge arrester operations.

[0003] In related technologies, when it is necessary to check the number of times the surge arrester has operated, the only way to check the number of operations is for maintenance personnel to open the door of the box-type high-voltage cabinet on-site. This results in low monitoring efficiency and makes it impossible to monitor the magnitude of the surge arrester's leakage current in real time. Summary of the Invention

[0004] To address the aforementioned technical problem of low monitoring efficiency, the technical solution adopted by this invention is as follows: Three-phase discharge counting module, Hall current sensor module, and electromagnetic current sensor module.

[0005] The three-phase discharge counting module includes a surge arrester and a counter; the input terminal of the surge arrester is connected to the counter, the Hall current sensor in the Hall current sensor module, and the input terminal of the electromagnetic current sensor module; the counter is grounded through a nonlinear resistor submodule. The Hall current sensor module includes a Hall current sensor, a signal amplifier, a power amplifier, and a first monitoring module; the output terminal of the Hall current sensor is connected to the input terminal of the signal amplifier, the output terminal of the signal amplifier is connected to the input terminal of the power amplifier, and the output terminal of the power amplifier is connected to the first monitoring module; the first monitoring module is used to monitor the number of discharges of the surge arrester. The output terminal of the electromagnetic current sensor is connected to the input terminal of the signal amplifier, and the output terminal of the power amplifier is connected to the second monitoring module of the electromagnetic current sensor; the second monitoring module is used to monitor the leakage current value when the surge arrester is running.

[0006] Specifically, the Hall current sensor includes: a first iron core and a Hall element; The first iron core is an open-loop type, and the Hall element is disposed at the opening of the first iron core.

[0007] Specifically, the Hall element is used to input the Hall signal generated by the first iron core under the action of a magnetic field to the signal amplifier.

[0008] Furthermore, the first monitoring module includes a first resistor, a first diode, and a discharge counter connected in parallel; The input terminal of the first resistor is connected to the output terminal of the power amplifier, the output terminal of the first resistor is connected to the input terminal of the discharge counter, and the output terminal of the discharge counter is connected to the user terminal to output the discharge count of the surge arrester to the user terminal. The negative terminal of the first diode is connected to the input terminal of the discharge counter, and the positive terminal is grounded.

[0009] Specifically, the electromagnetic current sensor module includes: a second iron core, a second resistor, a signal acquisition amplifier, a voltage processing module, and a second monitoring module; The second resistor and one end of the signal acquisition amplifier are connected to the induction winding of the second iron core, the other end of the second resistor is grounded, the output terminal of the signal acquisition amplifier is connected to the input terminal of the voltage processing module, and the output terminal of the voltage processing module is connected to the second monitoring module.

[0010] Specifically, the voltage processing module includes a rectifier filter, a DC voltage output module, and an AC voltage output module; The output terminal of the signal acquisition amplifier is connected to the AC voltage output module. The input terminal of the rectifier filter is connected to the output terminal of the signal acquisition amplifier, and the output terminal of the rectifier filter is connected to the DC voltage output module.

[0011] Furthermore, the second monitoring module includes a diode D2 and a leakage current monitor connected in parallel.

[0012] Specifically, the leakage current monitor is connected to the user terminal and is used to output the real-time leakage current value of the surge arrester during operation to the user terminal.

[0013] Specifically, the counter includes: a nonlinear resistor submodule, a rectifier, and a leakage current monitoring module; The input terminal of the surge arrester is connected to the input terminals of the rectifier, the Hall current sensor module, and the electromagnetic current sensor module. The output terminal of the rectifier is connected to the input terminal of the nonlinear resistor submodule, and the output terminal of the nonlinear resistor submodule is connected to the input terminal of the leakage current monitoring module.

[0014] Furthermore, the nonlinear resistor submodule includes the nonlinear resistor, the second nonlinear resistor, and the third nonlinear resistor.

[0015] This invention has at least the following technical advantages: By installing a Hall current sensor module and an electromagnetic current sensor module on the common ground terminal of the three-phase discharge counting module, the number of discharges and the real-time leakage current value during operation of the surge arrester can be measured. The Hall sensor module is used to remotely monitor the number of discharges of the surge arrester during lightning overvoltage. Furthermore, the first monitoring module in the Hall current sensor module solves the problem of not being able to remotely monitor the discharge count of the surge arrester during thunderstorms. By installing the electromagnetic current sensor module for remote monitoring of the leakage current value of the surge arrester during online operation, the problem of not being able to monitor the leakage current value of the surge arrester during online operation is solved.

[0016] This solution eliminates the need for maintenance personnel to open the high-voltage cabinet door of the transformer substation to check the discharge count of the high-voltage surge arrester (MOA), thus preventing personal safety accidents. The operational status of the transformer substation's high-voltage MOA can be displayed remotely from the control panel. Maintenance personnel can monitor the number of discharge actions and the real-time leakage current at any time, gaining a comprehensive understanding of the MOA's operation. This allows for the early detection of potential hazards in the high-voltage surge arrester (MOA), preventing MOA malfunctions and improving the reliability of the power system's safe operation.

[0017] With this design, the surge arrester test circuit is compatible with multiple driving modes, can meet the needs of remote real-time monitoring, greatly improves the remote monitoring of photovoltaic box-type high-voltage surge arresters, and enhances safety and reliability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a surge arrester operation monitoring circuit provided by the present invention; Figure 2 This is a schematic diagram of a JS-8 type photovoltaic box-type high-voltage surge arrester circuit provided by the present invention. Detailed Implementation

[0020] To make the technical problems, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0021] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of this invention, unless otherwise expressly defined, the terms "installed," "connected," "linked," and "connecting element" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention in conjunction with the specific circumstances.

[0022] like Figure 1 As shown, an embodiment of the present invention provides a surge arrester operation monitoring circuit, including: a three-phase discharge counting module 100, a Hall current sensor module 200, and an electromagnetic current sensor module 300.

[0023] The three-phase discharge counting module 100 includes a surge arrester 101 and a counter 110. The input terminal of the surge arrester 101 is connected to the counter 110, the Hall current sensor 201 in the Hall current sensor module 200 and the input terminal of the electromagnetic current sensor module 300. The counter 110 is grounded through a nonlinear resistor (R3) 1111.

[0024] Specifically, surge arrester 101 is a metal oxide surge arrester (MOA), which is an important protective electrical device used to protect the insulation of power transmission and transformation equipment from overvoltage damage.

[0025] The Hall current sensor module 200 includes a Hall current sensor 201, a signal amplifier 202, a power amplifier 203, and a first monitoring module 210. The output terminal of the Hall current sensor 201 is connected to the input terminal of the signal amplifier 202, the output terminal of the signal amplifier 202 is connected to the input terminal of the power amplifier 203, and the output terminal of the power amplifier 203 is connected to the first monitoring module 210. The first monitoring module 210 is used to monitor the number of discharges of the surge arrester 101.

[0026] Specifically, the Hall current sensor 201 is connected to the surge arrester 101 and can respond to the pulsed magnetic field generated by the lightning current I1 in the surge arrester 101, converting it into a Hall signal, i.e., a voltage signal, based on the intensity of the pulsed magnetic field. The Hall current sensor 201 has an input current of 0–50A and an output voltage of DC 0–10V. A linearly proportional voltage change (DC 0–10V) will be observed at the output terminal of the Hall current sensor.

[0027] Furthermore, the signal amplifier 202 and the power amplifier 203 can process the Hall signal and output an electrical signal I2 with an intensity that meets a preset intensity threshold to the first monitoring module.

[0028] Here, after the first monitoring module receives the electrical signal I2, it can count the number of discharges based on the electrical signal I2 to achieve real-time monitoring.

[0029] The output terminal of the electromagnetic current sensor 300 is connected to the input terminal of the signal amplifier 202, and the output terminal of the power amplifier 203 is connected to the second monitoring module 310 of the electromagnetic current sensor 300; the second monitoring module 310 is used to monitor the real-time leakage current value of the surge arrester 101 during operation.

[0030] Specifically, the electromagnetic current sensor 301 in the electromagnetic current sensor module 300 is a perforated high-precision electromagnetic AC current sensor. The input AC current of the perforated high-precision electromagnetic AC current sensor is 0–10 mA, and the output voltage is DC 0–5 V.

[0031] Furthermore, the electromagnetic current sensor module 300 can measure the AC leakage current of the online surge arrester 101 in real time.

[0032] Here, when the material of surge arrester 101 ages, the leakage current of surge arrester 101 will appear at the input terminal of electromagnetic AC current sensor module 300, and a corresponding linearly proportional voltage (DC 0~5V) will appear at its output terminal. The DC 0~5V analog signal can be transmitted to the box-type transformer acquisition device via 485 communication, and then transmitted through the original optical cable network to realize the display of the leakage current of surge arrester 101 at the remote monitoring background of the photovoltaic system.

[0033] Specifically, the Hall current sensor 201 includes: a first iron core 2011 and a Hall element 2012; The first iron core 2011 is an open-loop type, and the Hall element 2012 is disposed at the opening of the first iron core 2011.

[0034] Here, the first iron core 2011 adopts an open-loop structure with an opening, which can provide a magnetic circuit channel for the measured current (i.e., the surge arrester discharge current I1). When the measured current I1 passes through the iron core, an alternating magnetic field proportional to the magnitude of the current will be generated in the iron core.

[0035] Here, the Hall element 2012 can generate a Hall signal in a direction perpendicular to the current and the magnetic field.

[0036] Furthermore, the Hall element 2012 is used to input the Hall signal generated by the first iron core 2011 under the action of the magnetic field to the signal amplifier 202.

[0037] Here, the discharge current I1 of the surge arrester 101 passes through the first iron core 2011, generating a magnetic field in the first iron core 2011. The Hall element 2011 located at the opening senses this magnetic field and outputs a Hall signal. This signal is then processed by subsequent circuits such as the signal amplifier 202 (+A) and the power amplifier 203 to obtain the processed electrical signal I2.

[0038] Furthermore, the first monitoring module 210 includes a first resistor (R1) 211, a first diode (D5) 212, and a discharge counter 213 connected in parallel.

[0039] The input terminal of the first resistor 211 is connected to the output terminal of the power amplifier 203, the output terminal of the first resistor 211 is connected to the input terminal of the discharge counter 213, and the output terminal of the discharge counter 213 is connected to the user terminal 400 to output the discharge count of the surge arrester 101 to the user terminal 400.

[0040] The negative terminal of the first diode 212 is connected to the input terminal of the discharge counter 213, and the positive terminal is grounded.

[0041] Here, the input terminal of the first resistor 212 is connected to the output terminal of the power amplifier 203 to receive the electrical signal amplified by the power amplifier; the output terminal is connected to the input terminal of the discharge counter 213 to limit or condition the input signal.

[0042] The first resistor 212 ensures that the signal amplitude is within the rated operating range, preventing damage to the discharge counter 213 due to excessively strong signals and guaranteeing the stability of the Hall current sensor module 200.

[0043] Here, the Hall current sensor 201 has an overload capacity of 20 times the rated input current for 1 second. When the input exceeds the rated input value of the Hall current sensor 201, the output value of the Hall current sensor 201 will also exceed the rated value. Therefore, a first diode 212 needs to be added to the output terminal of the Hall current sensor 201 for protection.

[0044] Among them, the first diode 212 is a limiting voltage regulator diode. When the pulse signal output by the power amplifier 203 disappears, it can provide a discharge path for the transient current in the circuit, which can prevent the reverse electromotive force from damaging the discharge counter 213 and ensure the safe and stable operation of the discharge counter 213.

[0045] In the above embodiment, the electrical signal output by the power amplifier 203 is input to the input terminal of the second resistor 211, and transmitted through the second resistor 211 to the input terminal of the discharge counter 213. The first diode 212 is connected in parallel between the input terminal of the discharge counter 213 and ground. The discharge counter 213 processes the input signal, counts the number of discharges of the surge arrester 101, and then transmits the data to the user terminal 400 through its output terminal.

[0046] Specifically, the electromagnetic current sensor module 300 includes: a second iron core 301, a fourth resistor (R2) 302, a signal acquisition amplifier 303, a voltage processing module 304, and a second monitoring module 310. In this configuration, one end of the second resistor 302 and the signal acquisition amplifier 303 are connected to the induction winding of the second iron core 302, the other end of the second resistor 302 is grounded, the output terminal of the signal acquisition amplifier 303 is connected to the input terminal of the voltage processing module 304, and the output terminal of the voltage processing module 304 is connected to the second monitoring module 310.

[0047] Here, the second iron core 301 can generate an alternating magnetic field in the iron core that is proportional to the magnitude of the leakage current.

[0048] Here, one end of the second resistor 302 is connected to the induction winding of the second iron core 301, and the other end is grounded. It can convert the current signal induced by the iron core into a voltage signal I3 that can be recognized by the signal acquisition amplifier 303.

[0049] Furthermore, the voltage processing module 304 includes a rectifier filter 3041, a DC voltage output module 3042, and an AC voltage output module 3043; The output terminal of the signal acquisition amplifier 303 is connected to the AC voltage output module 3043. The input terminal of the rectifier filter 3041 is connected to the output terminal of the signal acquisition amplifier 303, and the output terminal of the rectifier filter 3041 is connected to the DC voltage output module 3042.

[0050] Here, the output of the signal acquisition amplifier 303 is directly connected to the AC voltage output module 3043, which is used to output the amplified AC signal in the form of the original AC voltage.

[0051] Here, the input terminal of the rectifier filter 3041 is connected to the output terminal of the signal acquisition amplifier 303, which is used to rectify the amplified AC signal into a pulsating DC signal, and then output a DC signal through filtering.

[0052] Furthermore, the second monitoring module 310 includes a second diode 311 and a leakage current monitor 312 connected in parallel.

[0053] Here, since the electromagnetic current sensor module 300 has an overload capacity of 20 times the rated input current for 1 second, when the input current exceeds the rated input value of the electromagnetic current sensor module 300, the output value of the electromagnetic current sensor module 300 will also exceed the rated value. Therefore, a limiting voltage regulator diode (i.e., the second diode (D6) 311) needs to be added to the output terminal of the electromagnetic current sensor module 300 for protection.

[0054] The electromagnetic current sensor module 300 utilizes the principle of inductive coupling to induce and output a DC voltage signal of a corresponding linear proportion through the coupling secondary coil of the surge arrester 101, while lightning is a unipolar pulse wave and will not induce a corresponding voltage output in the secondary coil of the electromagnetic AC current sensor.

[0055] Furthermore, the leakage current monitor 312 is connected to the user terminal 400 and is used to output the real-time leakage current value of the surge arrester 101 during operation to the user terminal 400.

[0056] Here, the leakage current monitor 312 is connected to the user terminal 400 and is used to receive the DC voltage signal output by the voltage processing module 304. By analyzing and calculating the signal, the real-time leakage current value of the surge arrester 101 during operation is obtained, and the leakage current value is output to the user terminal 400, so that the user terminal 400 can monitor the leakage current value of the surge arrester 101 in real time and provide a basis for the aging status assessment of the surge arrester 101.

[0057] During actual operation, the leakage current of the surge arrester passes through the second iron core 301, generating a magnetic field within it. The induction winding of the second iron core 301 induces a weak voltage signal. This signal is conditioned by the fourth resistor 302 and amplified by the signal acquisition amplifier 303. Part of this signal is transmitted to the AC voltage output module 3043 to output AC voltage; the other part is transmitted to the rectifier filter 3041, and after rectification and filtering, it is output as DC voltage by the DC voltage output module 3042. The DC voltage signal is input to the second monitoring module 310, and after analysis and processing by the leakage current monitor 312, the real-time leakage current value during operation is transmitted to the user terminal 400.

[0058] Specifically, the counter 110 includes: a nonlinear resistor submodule 111, a rectifier 112, and a leakage current monitoring module 113; The input terminal of the surge arrester 101 is connected to the input terminals of the rectifier 112, the Hall current sensor module 200, and the electromagnetic current sensor module 300. The output terminal of the rectifier 112 is connected to the input terminal of the nonlinear resistor submodule 111. The output terminal of the nonlinear resistor submodule 111 is connected to the input terminal of the leakage current monitoring module 113. The output terminal of the leakage current monitoring module 113 is grounded.

[0059] Here, one end of the nonlinear resistor submodule 111 is connected to the output terminal of the surge arrester 101 to receive the current signal generated by the discharge of the surge arrester 101; the other end is connected to the AC input terminal of the rectifier 112 to perform voltage division, current limiting or signal conditioning of the input current signal, ensuring that the amplitude of the current signal input to the rectifier 112 is within its rated operating range, and ensuring the stable operation of the rectifier 112.

[0060] Here, the leakage current monitoring module 113 includes a capacitor 1131 and an electromagnetic device 1132 connected in parallel. It can convert the input current signal into a mechanical counting action or an electrical signal counting through principles such as electromagnetic induction, so as to achieve a preliminary count of the number of discharges of the surge arrester 101.

[0061] Furthermore, the nonlinear resistor submodule 111 includes a nonlinear resistor 1111, a second nonlinear resistor (R4) 1112, and a third nonlinear resistor (R5) 1113; One end of the nonlinear resistor submodule 111 is connected to the output terminal of the surge arrester 101, and the other end of the nonlinear resistor submodule 111 is connected to the AC input terminal of the rectifier 112.

[0062] Here, only the surge arrester and discharge counter circuit of phase B are shown in the figure. Each nonlinear resistor of phase A and phase C (i.e., the second nonlinear resistor 1111 and the third nonlinear resistor 1113) has a JS-8 type counter (not shown) that is the same as the surge arrester (i.e., surge arrester 101) connected to B.

[0063] The embodiment of this invention provides a valve test circuit whose working principle is as follows: A Hall current sensor module 200 and an electromagnetic current sensor module 300 are installed at the common ground terminal of the three-phase discharge counting module 100 to measure the discharge count and real-time leakage current value of the surge arrester 101 during operation. The Hall sensor module is used to remotely monitor the discharge count of the surge arrester 101 during lightning overvoltage. Furthermore, the first monitoring module 210 in the Hall current sensor module 200 solves the problem of not being able to remotely monitor the discharge count of the surge arrester 101 during thunderstorms. The installation of the electromagnetic current sensor module 300 for remote monitoring of the leakage current value of the surge arrester 101 during online operation solves the problem of not being able to monitor the leakage current value of the surge arrester 101 during online operation.

[0064] This solution eliminates the need for maintenance personnel to open the high-voltage cabinet door of the transformer substation to check the discharge count of the high-voltage surge arrester (MOA), thus preventing personal safety accidents. The operational status of the transformer substation's high-voltage MOA can be displayed remotely from the control panel. Maintenance personnel can monitor the number of discharge actions and the magnitude of leakage current at any time, allowing for early detection of potential hazards in the MOA and preventing operational accidents, thereby improving the reliability of the power system's safe operation.

[0065] While specific embodiments of the invention have been described in detail by way of example, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. It should also be understood that various modifications can be made to the embodiments without departing from the scope and spirit of the invention. The scope of this invention is defined by the appended claims.

Claims

1. A surge arrester operation monitoring circuit, characterized in that, include: Three-phase discharge counting module, Hall current sensor module and electromagnetic current sensor module; The three-phase discharge counting module includes a surge arrester and a counter; the input terminal of the surge arrester is connected to the counter, the Hall current sensor in the Hall current sensor module, and the input terminal of the electromagnetic current sensor module; the counter is grounded through a nonlinear resistor submodule. The Hall current sensor module includes a Hall current sensor, a signal amplifier, a power amplifier, and a first monitoring module; the output terminal of the Hall current sensor is connected to the input terminal of the signal amplifier, the output terminal of the signal amplifier is connected to the input terminal of the power amplifier, and the output terminal of the power amplifier is connected to the first monitoring module; the first monitoring module is used to monitor the number of discharges of the surge arrester. The output terminal of the electromagnetic current sensor is connected to the input terminal of the signal amplifier, and the output terminal of the power amplifier is connected to the second monitoring module of the electromagnetic current sensor; the second monitoring module is used to monitor the leakage current value when the surge arrester is running.

2. The surge arrester operation monitoring circuit according to claim 1, characterized in that, The Hall current sensor includes: a first iron core and a Hall element; The first iron core is an open-loop type, and the Hall element is disposed at the opening of the first iron core.

3. The surge arrester operation monitoring circuit according to claim 2, characterized in that, The Hall element is used to input the Hall signal generated by the first iron core under the action of a magnetic field to the signal amplifier.

4. The surge arrester operation monitoring circuit according to claim 1, characterized in that, The first monitoring module includes a first resistor, a first diode, and a discharge counter connected in parallel; The input terminal of the first resistor is connected to the output terminal of the power amplifier, the output terminal of the first resistor is connected to the input terminal of the discharge counter, and the output terminal of the discharge counter is connected to the user terminal to output the discharge count of the surge arrester to the user terminal. The negative terminal of the first diode is connected to the input terminal of the discharge counter, and the positive terminal is grounded.

5. The surge arrester operation monitoring circuit according to claim 1, characterized in that, The electromagnetic current sensor module includes: a second iron core, a second resistor, a signal acquisition amplifier, a voltage processing module, and a second monitoring module; The second resistor and one end of the signal acquisition amplifier are connected to the induction winding of the second iron core, the other end of the second resistor is grounded, the output terminal of the signal acquisition amplifier is connected to the input terminal of the voltage processing module, and the output terminal of the voltage processing module is connected to the second monitoring module.

6. The surge arrester operation monitoring circuit according to claim 5, characterized in that, The voltage processing module includes a rectifier filter, a DC voltage output module, and an AC voltage output module; The output terminal of the signal acquisition amplifier is connected to the AC voltage output module. The input terminal of the rectifier filter is connected to the output terminal of the signal acquisition amplifier, and the output terminal of the rectifier filter is connected to the DC voltage output module.

7. The surge arrester operation monitoring circuit according to claim 5, characterized in that, The second monitoring module includes a second diode and a leakage current monitor connected in parallel.

8. The surge arrester operation monitoring circuit according to claim 7, characterized in that, The leakage current monitor is connected to the user terminal and is used to output the leakage current value of the surge arrester during operation to the user terminal.

9. The surge arrester operation monitoring circuit according to claim 1, characterized in that, The counter includes: a nonlinear resistor submodule, a rectifier, and a leakage current monitoring module; The input terminal of the surge arrester is connected to the input terminals of the rectifier, the Hall current sensor module, and the electromagnetic current sensor module. The output terminal of the rectifier is connected to the input terminal of the nonlinear resistor submodule, and the output terminal of the nonlinear resistor submodule is connected to the input terminal of the leakage current monitoring module.

10. The surge arrester operation monitoring circuit according to claim 9, characterized in that, The nonlinear resistor submodule includes a first nonlinear resistor, a second nonlinear resistor, and a third nonlinear resistor.

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