Lightning arrester discharge counter and discharge monitoring method

Abstract

The invention provides a lightning arrester discharge counter and a discharge monitoring method. The counter comprises a pulse extraction module, a signal processing module and a counting analysis module. Wherein the pulse extraction module is used for collecting a current signal in the discharge process of the lightning arrester and extracting a pulse current in the current signal to obtain a pulse voltage signal; the signal processing module is used for processing the pulse voltage signal to obtain a discharge pulse sequence; and the counting analysis module is used for counting in response to the discharge pulse sequence to obtain a discharge counting result. According to the lightning arrester discharge counter, current signals in the discharge process of a lightning arrester can be quickly and effectively collected, and the current signals are converted into a discharge pulse sequence capable of quickly responding based on the signal processing module, so that the counting analysis module can perform quick response counting; accurate counting can be carried out under the action of multiple lightning strokes, and the action reliability and accuracy of the lightning arrester discharge counter under the action of multiple lightning strokes are improved.

Description

Technical Field

[0001] The invention relates to the technical field of power equipment status monitoring, and in particular to a lightning arrester discharge counter and a discharge monitoring method. Background Art

[0002] In the operation and maintenance of power systems, arresters are an important overvoltage protection device, and their status monitoring is crucial to ensure the safe and stable operation of power systems. Traditional arrester discharge counters are mainly used to record the number of discharges of arresters. However, due to the limitations of the capacitor charging and discharging time constant and the electromagnetic mechanical flipping action time, as well as the influence of the discharge current waveform difference, the discharge counters in actual operation have the problem of unreliable operation. Especially in the case of multiple lightning strikes, it is difficult for traditional discharge counters to accurately record each discharge event, resulting in the inability to accurately evaluate the action status of the arrester, which brings difficulties to overvoltage analysis and equipment status evaluation.

[0003] To solve this problem, in recent years, a variety of improved monitoring technologies have emerged in the field of power equipment condition monitoring. These technologies usually involve the use of more advanced sensors, data acquisition systems, and signal processing algorithms to improve the accuracy and reliability of monitoring data. However, these technologies still face monitoring challenges under multiple lightning strikes, especially in distinguishing and identifying different types of discharge defects, which require more accurate and robust methods. Summary of the invention

[0004] The present invention aims to provide a lightning arrester discharge counter and a discharge monitoring method to solve the above technical problems and improve the reliability and accuracy of the lightning arrester discharge counter under multiple lightning strikes.

[0005] In order to solve the above technical problems, the present invention provides a lightning arrester discharge counter, including a pulse extraction module, a signal processing module and a counting analysis module; wherein: the pulse extraction module is used to collect the current signal during the lightning arrester discharge process and extract the pulse current in the current signal to obtain the pulse voltage signal; the signal processing module is used to process the pulse voltage signal to obtain a discharge pulse sequence; the counting analysis module is used to count in response to the discharge pulse sequence to obtain the discharge counting result.

[0006] In the above scheme, the arrester discharge counter can quickly and effectively collect the current signal during the arrester discharge process, and convert the current signal into a discharge pulse sequence that can respond quickly based on the signal processing module, so that the counting analysis module can respond quickly and count accurately under the action of multiple lightning strikes, effectively solving the problem of unreliable counting of traditional counters under the action of multiple lightning strikes, and improving the reliability and accuracy of the arrester discharge counter under the action of multiple lightning strikes.

[0007] Furthermore, the equivalent circuit of the pulse extraction module includes a coil, a line inductance, an equivalent resistor, a distributed capacitor, a damping resistor, an integral resistor and an integral capacitor; wherein: the first end of the line inductance is electrically connected to the first end of the coil, and the second end of the line inductance is electrically connected to the first end of the equivalent resistor; the second end of the equivalent resistor is electrically connected to the first end of the integral resistor; the second end of the integral resistor is electrically connected to the first end of the integral capacitor; the second end of the integral capacitor is electrically connected to the second end of the coil; the first end of the distributed capacitor is electrically connected to the second end of the equivalent resistor, and the second end of the distributed capacitor is electrically connected to the second end of the coil; the first end of the damping resistor is electrically connected to the second end of the equivalent resistor, and the second end of the damping resistor is electrically connected to the second end of the coil; the coil surrounds the arrester, and is used to collect the current signal during the discharge process of the arrester and generate an induced voltage based on the current signal; the integral resistor is used to generate a pulse current based on the induced voltage; the coil integrates the pulse current to obtain a pulse voltage signal.

[0008] It should be noted that the coil can be a Rogowski coil, and the current signal during the discharge process of the arrester can be collected by the Rogowski coil and the pulse current can be extracted by the integral resistor, so that the pulse voltage signal can be accurately and quickly obtained. The coil can include one or more windings, and the coil is wrapped around the arrester to be tested. When the arrester is discharged, an induced voltage can be generated in the coil.

[0009] Furthermore, the integral capacitor can be used to ensure smooth output pulse current and reduce high-frequency noise, and can be used to determine the time constant of the equivalent circuit of the pulse extraction module, whose parameters are related to the response speed and response frequency. The setting of the damping resistor can make the equivalent circuit work in the optimal damping state.

[0010] It should be noted that the equivalent circuit of the pulse extraction module is a current integration circuit, and its lower cutoff frequency is related to the time constant. The increase of the time constant will reduce the lower cutoff frequency, which is conducive to increasing the bandwidth, optimizing the low-frequency response of the coil measurement, and solving the problem of wave tail drop when measuring the coil. The upper cutoff frequency is mainly related to the line inductance and distributed capacitance. Reducing the line inductance and distributed capacitance and winding the coil as evenly as possible during production are conducive to increasing the upper cutoff frequency.

[0011] Furthermore, a ferrite core is provided in the coil, and the ferrite core can enhance the coupling of the magnetic field, improve the sensitivity of the coil, and thus improve the accuracy of obtaining the current signal.

[0012] Further, the signal processing module includes a first varistor, a second varistor, a first voltage-limiting resistor, a second voltage-limiting resistor, a rectifier bridge circuit, a TVS diode and a signal conversion circuit; wherein: the first varistor is connected in parallel with the coil; the first voltage-limiting resistor is connected in parallel with the first varistor; the first end of the first varistor is electrically connected to the first end of the second voltage-limiting resistor; the second end of the second voltage-limiting resistor is electrically connected to the first end of the second varistor; the second end of the second varistor is electrically connected to the second end of the first varistor; the first end of the second varistor is electrically connected to the first end of the rectifier bridge circuit; the second end of the second varistor is electrically connected to the second end of the rectifier bridge circuit; the third end of the rectifier bridge circuit is electrically connected to the first end of the TVS diode; the fourth end of the rectifier bridge circuit is electrically connected to the second end of the TVS diode; the first end of the TVS diode is electrically connected to the input end of the signal conversion circuit; the output end of the signal conversion circuit is electrically connected to the counting and analysis module.

[0013] The pulse current generated by the pulse voltage signal obtained by the above scheme has polarity. Therefore, by setting a rectifier bridge circuit, the pulse voltage signal can be converted into a unidirectional pulse voltage signal to form a discharge pulse sequence, so that the counting analysis module can respond and count accurately.

[0014] In the above scheme, the signal module can prevent the pulse voltage signal obtained by the coil integration from far exceeding the tolerance of the electronic circuit and damaging the counter in the case of a large current signal. In order to ensure that the generated discharge pulse sequence meets the requirements of the counting analysis module, a three-level voltage limiting process is set in this scheme to ensure that the discharge pulse sequence entering the counting analysis module meets the requirements. Among them:

[0015] A first varistor is set at the coil output end for the first level voltage limiting; after the current is limited by the second voltage limiting resistor, the second varistor is used to limit the second level voltage; after the voltage signal enters the rectifier bridge circuit for level conversion, a TVS diode is set for the third level voltage limiting.

[0016] Further, the signal conversion circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor and a transistor; wherein: the first end of the first resistor is electrically connected to the first end of the TVS diode, the second end of the first resistor is electrically connected to the first end of the second resistor; the second end of the second resistor is electrically connected to the second end of the TVS diode; the second end of the first resistor is electrically connected to the base of the transistor; the emitter of the transistor is electrically connected to the first end of the third resistor; the second end of the third resistor is electrically connected to the second end of the TVS diode; the first end of the fourth resistor is connected to the power supply, and the second end thereof is electrically connected to the collector of the transistor as the output end of the signal conversion circuit.

[0017] Furthermore, the arrester discharge counter also includes a current comparison module, which is used to preset a current lower limit threshold and collect current signals during the arrester discharge process to transmit current signals not less than the current lower limit threshold to the pulse extraction module.

[0018] In the above scheme, before the pulse extraction module collects the current signal, the current lower limit threshold is set by the current comparison module. Only the current signal that is not less than the current lower limit threshold can be sent to the pulse extraction module. This can make the current signal meet actual needs, effectively avoid other interferences causing miscounting, and further improve the performance and counting accuracy of the counter.

[0019] Furthermore, the counting and analyzing module includes a pulse current sensor, and the pulse current sensor is used to respond to the discharge pulse sequence and perform counting to obtain the discharge counting result.

[0020] In the above scheme, the converted discharge pulse sequence can be efficiently responded by the pulse current sensor. The pulse current sensor can quickly record the discharge pulse sequence with an interval time of not less than 20 milliseconds, and realize reliable application in multiple lightning strike application scenarios.

[0021] Furthermore, the counting and analysis module also includes a central processing unit, which is used to respond to the discharge pulse sequence and discharge counting results of the pulse current sensor, store and analyze the discharge pulse sequence and the discharge counting results, and obtain the discharge event corresponding to each discharge pulse sequence.

[0022] In the above scheme, the central processing unit (MCU) is used to store and analyze the discharge pulse sequence and discharge counting results obtained by the counting analysis module, which can not only display the number of discharge actions, but also store the number of discharge actions, providing favorable data support for subsequent data analysis and arrester status evaluation. Among them, the central processing unit can be a single-chip microcomputer, and the single-chip microcomputer interrupt method can be used to record multiple lightning strikes and set the terminal shielding time once to prevent false operations caused by a single lightning strike counterattack, thereby improving the robustness of the counter.

[0023] The present invention also provides a lightning arrester discharge monitoring method, which is implemented by using a lightning arrester discharge counter as described above, and comprises the following steps:

[0024] Collect the current signal during the discharge process of the arrester and extract the pulse current in the current signal to obtain the pulse voltage signal;

[0025] Acquiring a discharge pulse sequence based on the pulse voltage signal;

[0026] A counting operation is performed based on the discharge pulse sequence to obtain a discharge counting result.

[0027] Furthermore, the arrester discharge monitoring method also includes: storing and analyzing the discharge pulse sequence and the discharge counting result to obtain the discharge event corresponding to each discharge pulse sequence.

[0028] The above scheme is based on the application of the arrester discharge counter, which realizes the improvement of the discharge pulse sequence extraction method and the improvement of the internal circuit module of the counter. It can reliably record the action under multiple lightning strikes and solve the problem of unreliable action of traditional counters under multiple lightning strikes. This method can accurately record and analyze the discharge events of the arrester under multiple lightning strikes, thereby providing more reliable data support for fault diagnosis and status assessment of power equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of a lightning arrester discharge counter module architecture provided by an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of an equivalent circuit of a pulse extraction module provided by an embodiment of the present invention;

[0031] Figure 3 A circuit diagram of a signal processing module provided by an embodiment of the present invention;

[0032] Figure 4 A schematic flow chart of a method for monitoring discharge of a lightning arrester provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1 This embodiment provides a lightning arrester discharge counter, including a pulse extraction module, a signal processing module and a counting analysis module; wherein: the pulse extraction module is used to collect the current signal during the lightning arrester discharge process and extract the pulse current in the current signal to obtain the pulse voltage signal; the signal processing module is used to process the pulse voltage signal to obtain a discharge pulse sequence; the counting analysis module is used to count in response to the discharge pulse sequence to obtain the discharge counting result.

[0035] In this embodiment, the arrester discharge counter can quickly and effectively collect the current signal during the arrester discharge process, and convert the current signal into a discharge pulse sequence that can respond quickly based on the signal processing module, so that the counting analysis module can respond quickly and count accurately under the action of multiple lightning strikes, effectively solving the problem of unreliable counting of traditional counters under the action of multiple lightning strikes, and improving the reliability and accuracy of the arrester discharge counter under the action of multiple lightning strikes.

[0036] For further information, see Figure 2 , the equivalent circuit of the pulse extraction module includes a coil M, a line inductance L, an equivalent resistor r, a distributed capacitor C0, a damping resistor R2, an integral resistor R and an integral capacitor C; wherein: the first end of the line inductance L is electrically connected to the first end of the coil M, and the second end of the line inductance L is electrically connected to the first end of the equivalent resistor r; the second end of the equivalent resistor r is electrically connected to the first end of the integral resistor R; the second end of the integral resistor R is electrically connected to the first end of the integral capacitor C; the second end of the integral capacitor C is electrically connected to the second end of the coil M; the first end of the distributed capacitor C0 is electrically connected to the second end of the equivalent resistor r, and the second end of the distributed capacitor C0 is electrically connected to the second end of the coil M; the first end of the damping resistor R2 is electrically connected to the second end of the equivalent resistor r, and the second end of the damping resistor R2 is electrically connected to the second end of the coil M; the coil M surrounds the arrester and is used to collect the current signal during the discharge process of the arrester and generate an induced voltage based on the current signal; the integral resistor R is used to generate a pulse current based on the induced voltage; the coil M integrates the pulse current to obtain a pulse voltage signal.

[0037] It should be noted that the coil M can be a Rogowski coil. The current signal during the discharge of the arrester is collected by the Rogowski coil and the pulse current is extracted by the integral resistor R, so that the pulse voltage signal can be accurately and quickly obtained. The coil M may include one or more windings, and the coil M is wrapped around the arrester to be measured. When the arrester is discharged, an induced voltage E can be generated in the coil M. The integral resistor R can be made of constantan foil to optimize the low-frequency response of the coil M during measurement and solve the problem of wave tail drop.

[0038] It should be further explained that the Rogowski coil can accurately restore the impulse current steep wave, standard lightning wave and operating wave current waveform with an error of less than 0.2%, which can effectively improve the accuracy of monitoring data.

[0039] Furthermore, the integral capacitor C can be used to ensure smooth output pulse current and reduce high-frequency noise, and can be used to determine the time constant of the equivalent circuit of the pulse extraction module, whose parameters are related to the response speed and response frequency. The setting of the damping resistor R2 can make the equivalent circuit work in the optimal damping state.

[0040] It should be noted that the equivalent circuit of the pulse extraction module is a current integration circuit, and the transfer function of the current integration circuit can be:

[0041]

[0042] Where S represents the complex frequency variable; δ represents the damping coefficient; where:

[0043]

[0044] In the formula, R α represents input resistance;

[0045] Lower cut-off frequency f L and upper cutoff frequency f H They can be expressed as:

[0046]

[0047] In this embodiment, the lower cutoff frequency is related to the time constant. The increase of the time constant will reduce the lower cutoff frequency, which is conducive to reducing and increasing the bandwidth, optimizing the low-frequency response of the coil measurement, and solving the problem of wave tail drop when the coil is measured. The upper cutoff frequency is mainly related to the line inductance and distributed capacitance. Reducing the line inductance and distributed capacitance and winding the coil as evenly as possible during production are conducive to increasing the upper cutoff frequency.

[0048] Furthermore, a ferrite core is provided in the coil M, and the ferrite core can enhance the coupling of the magnetic field, improve the sensitivity of the coil, and thus improve the accuracy of obtaining the current signal.

[0049] For further information, see Figure 3 The signal processing module includes a first varistor Z1, a second varistor Z2, a first voltage-limiting resistor R3, a second voltage-limiting resistor R4, a rectifier bridge circuit G, a TVS diode and a signal conversion circuit; wherein: the first varistor Z1 is connected in parallel with the coil M; the first voltage-limiting resistor R3 is connected in parallel with the first varistor Z1; the first end of the first varistor Z1 is electrically connected to the first end of the second voltage-limiting resistor R4; the second end of the second voltage-limiting resistor R4 is electrically connected to the first end of the second varistor Z2; the second end of the second varistor Z2 is electrically connected to the second end of the first varistor Z1; the first end of the second varistor Z2 is electrically connected to the first end of the rectifier bridge circuit G; the second end of the second varistor Z2 is electrically connected to the second end of the rectifier bridge circuit G; the third end of the rectifier bridge circuit G is electrically connected to the first end of the TVS diode; the fourth end of the rectifier bridge circuit G is electrically connected to the second end of the TVS diode; the first end of the TVS diode is electrically connected to the input end of the signal conversion circuit; the output end of the signal conversion circuit is electrically connected to the counting and analysis module.

[0050] It should be noted that in order to make the signal output by the signal processing module more accurate and ensure accurate capture of discharge events, the signal processing module may also include modules for amplifying and filtering the signal, thereby ensuring the accuracy and reliability of the signal.

[0051] The pulse current generated by the pulse voltage signal obtained in this embodiment has polarity, so the pulse voltage signal can be converted into a unidirectional pulse voltage signal by setting a rectifier bridge circuit to form a discharge pulse sequence so that the counting analysis module can respond and count accurately.

[0052] In this embodiment, the signal module can prevent the pulse voltage signal obtained by integrating the coil M from far exceeding the tolerance of the electronic circuit and damaging the counter in the case of a large current signal. In order to ensure that the generated discharge pulse sequence meets the requirements of the counting analysis module, a three-level voltage limiting process is set in this embodiment to ensure that the discharge pulse sequence entering the counting analysis module meets the requirements and ensures the safety and stability of the circuit. Among them:

[0053] A first varistor Z1 is provided at the output end of the coil M for the first level voltage limiting; after the current is limited by the second voltage limiting resistor R4, the second varistor Z2 is used for the second level voltage limiting; after the voltage signal enters the rectifier bridge circuit G for level conversion, a TVS diode is provided for the third level voltage limiting.

[0054] It should be noted that the first varistor Z1 of this embodiment can be a 390V varistor, and the second varistor Z2 can be a 33V varistor. The TVS diode can be a 5V TVS tube, which plays the role of both the third-level voltage limiter and the comparison circuit. After the parameter setting of this embodiment is verified, its error is less than 0.2%.

[0055] Further, the signal conversion circuit includes a first resistor R5, a second resistor R6, a third resistor R7, a fourth resistor R8 and a transistor Q; wherein: a first end of the first resistor R5 is electrically connected to a first end of the TVS diode, a second end of the first resistor R5 is electrically connected to a first end of the second resistor R6; a second end of the second resistor R6 is electrically connected to a second end of the TVS diode; a second end of the first resistor R5 is electrically connected to a base of the transistor Q; an emitter of the transistor Q is electrically connected to a first end of the third resistor R7; a second end of the third resistor R7 is electrically connected to a second end of the TVS diode; a first end of the fourth resistor R8 is connected to a power supply Vcc, and a second end thereof serves as an output end U of the signal conversion circuit. out Electrically connected to the collector of transistor Q.

[0056] In this embodiment, resistors such as the first resistor R5 and the second resistor R6 can be used to limit current, thereby ensuring that the current flowing into the counting and analysis module meets the requirements, thereby protecting the counting and analysis module.

[0057] Furthermore, the arrester discharge counter also includes a current comparison module, which is used to preset a current lower limit threshold and collect current signals during the arrester discharge process to transmit current signals not less than the current lower limit threshold to the pulse extraction module.

[0058] In this embodiment, before the pulse extraction module collects the current signal, the current lower limit threshold is set by the current comparison module. Only the current signal that is not less than the current lower limit threshold can be sent to the pulse extraction module. It can adapt to different current waveform parameters, make the current signal meet actual needs, and effectively avoid false operation or omission caused by differences in waveform parameters, further improving the performance and counting accuracy of the counter.

[0059] Furthermore, the counting and analyzing module includes a pulse current sensor, and the pulse current sensor is used to respond to the discharge pulse sequence and perform counting to obtain the discharge counting result.

[0060] In this embodiment, the converted discharge pulse sequence can be efficiently responded by the pulse current sensor. The pulse current sensor can quickly record the discharge pulse sequence with an interval time of not less than 20 milliseconds, effectively capture each discharge event, and maintain response even in high-frequency discharge conditions, and achieve reliable application in multiple lightning strike application scenarios.

[0061] Furthermore, the counting and analysis module also includes a central processing unit, which is used to respond to the discharge pulse sequence and discharge counting results of the pulse current sensor, store and analyze the discharge pulse sequence and the discharge counting results, and obtain the discharge event corresponding to each discharge pulse sequence.

[0062] In this embodiment, the central processing unit (MCU) is used to store and analyze the discharge pulse sequence and discharge counting results obtained by the counting analysis module, which can not only display the number of discharge actions, but also store the number of discharge actions, providing favorable data support for subsequent data analysis and arrester status evaluation. Among them, the central processing unit can be a single-chip microcomputer, and the single-chip microcomputer interrupt method can be used to record multiple lightning strikes and set the shielding time of the terminal once to prevent malfunction caused by a single lightning strike counterattack, thereby improving the robustness of the counter.

[0063] It should be noted that, in the actual implementation process, a corresponding graphical user interface (GUI) can be set around the central processing unit to facilitate the display of data analysis results and facilitate monitoring and analysis by operators. And in the process of data analysis by the central processing unit, the fuzzy membership model of the fractal regression algorithm can be used to realize the classification of discharge defects for nonlinear and uncertain data, so as to improve the accuracy of discharge defect category identification. Among them, the characteristic parameters of the discharge pulse sequence are input into the fuzzy membership model of the fractal regression algorithm, and the identification results of the category of the induced discharge defect can be obtained. The characteristic parameters reflect the macroscopic characteristics of the discharge light emission activity and the characteristics of the light particle group, and can be used as an important indicator parameter for judging the optical characteristics of partial discharge.

[0064] At the same time, a corresponding wireless communication module can also be set up to remotely transmit or cloud synchronize the data stored in the central processor.

[0065] The counter provided in this embodiment has stronger robustness and anti-interference ability in the face of complex power system operating environments, such as multiple lightning strikes, by setting a three-level voltage limiting process and adopting a single-chip microcomputer interrupt. The counter can not only display the number of actions of the lightning arrester in real time, but also store the action signal in the central processing unit, which is convenient for subsequent data analysis and status evaluation. The counter has high reliability and robustness, which can greatly reduce the demand for on-site maintenance, effectively reduce equipment maintenance costs, and improve the operating efficiency of the power system. At the same time, by accurately recording the discharge events of the lightning arrester, the counter provides more reliable data support for overvoltage protection and fault diagnosis of the power system, which helps to discover and deal with potential safety hazards in advance, thereby improving the safety and stability of the entire power system.

[0066] See also Figure 4 This embodiment also provides a lightning arrester discharge monitoring method, which is implemented by using a lightning arrester discharge counter as described above, and includes the following steps:

[0067] S1: Collect the current signal during the discharge process of the arrester and extract the pulse current in the current signal to obtain the pulse voltage signal;

[0068] S2: obtaining a discharge pulse sequence based on the pulse voltage signal;

[0069] S3: Perform a counting operation based on the discharge pulse sequence to obtain a discharge counting result.

[0070] Furthermore, the arrester discharge monitoring method also includes: storing and analyzing the discharge pulse sequence and the discharge counting result to obtain the discharge event corresponding to each discharge pulse sequence.

[0071] This embodiment is based on the application of the arrester discharge counter, realizes the improvement of the discharge pulse sequence extraction method and the improvement of the internal circuit module of the counter, can reliably record the action status under multiple lightning strikes, and solves the problem of unreliable action of traditional counters under multiple lightning strikes. This method can accurately record and analyze the discharge events of the arrester under multiple lightning strikes, thereby providing more reliable data support for fault diagnosis and status assessment of power equipment.

[0072] In order to more clearly illustrate the technical effect of the present invention, this embodiment designs a ferrite core of φ40 / φ24×14.5, the coil uses 100 turns of 1.0 enameled wire and the integrating resistor uses 0.2×10mm copper foil to build a counter, and an AC signal with a current amplitude of 30A at a time interval of 20ms is input. It is measured that the counter can correctly reflect the discharge pulse sequence with an interval of 20ms.

[0073] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A lightning arrester discharge counter, characterized in that: It includes a pulse extraction module, a signal processing module and a counting analysis module; wherein: The pulse extraction module is used to collect the current signal during the discharge process of the arrester and extract the pulse current in the current signal to obtain the pulse voltage signal; The signal processing module is used to process the pulse voltage signal to obtain a discharge pulse sequence; The counting analysis module is used to count in response to the discharge pulse sequence and obtain the discharge counting result.

2. A lightning arrester discharge counter according to claim 1, characterized in that: The equivalent circuit of the pulse extraction module includes a coil, a line inductance, an equivalent resistor, a distributed capacitor, a damping resistor, an integral resistor and an integral capacitor; wherein: The first end of the line inductance is electrically connected to the first end of the coil, and the second end of the line inductance is electrically connected to the first end of the equivalent resistor; The second end of the equivalent resistor is electrically connected to the first end of the integral resistor; The second end of the integrating resistor is electrically connected to the first end of the integrating capacitor; The second end of the integrating capacitor is electrically connected to the second end of the coil; The first end of the distributed capacitor is electrically connected to the second end of the equivalent resistor, and the second end of the distributed capacitor is electrically connected to the second end of the coil; The first end of the damping resistor is electrically connected to the second end of the equivalent resistor, and the second end of the damping resistor is electrically connected to the second end of the coil; The coil surrounds the arrester and is used to collect the current signal during the discharge process of the arrester and generate an induced voltage based on the current signal; the integrating resistor is used to generate a pulse current based on the induced voltage; The coil integrates the pulse current to obtain a pulse voltage signal.

3. A lightning arrester discharge counter according to claim 2, characterized in that: A ferrite core is arranged in the coil.

4. A lightning arrester discharge counter according to claim 2, characterized in that: The signal processing module includes a first varistor, a second varistor, a first voltage limiting resistor, a second voltage limiting resistor, a rectifier bridge circuit, a TVS diode and a signal conversion circuit; wherein: The first varistor is connected in parallel with the coil; the first voltage-limiting resistor is connected in parallel with the first varistor; The first end of the first varistor is electrically connected to the first end of the second voltage limiting resistor; The second end of the second voltage limiting resistor is electrically connected to the first end of the second varistor; The second end of the second varistor is electrically connected to the second end of the first varistor; The first end of the second varistor is electrically connected to the first end of the rectifier bridge circuit; the second end of the second varistor is electrically connected to the second end of the rectifier bridge circuit; The third end of the rectifier bridge circuit is electrically connected to the first end of the TVS diode; the fourth end of the rectifier bridge circuit is electrically connected to the second end of the TVS diode; The first end of the TVS diode is electrically connected to the input end of the signal conversion circuit; The output end of the signal conversion circuit is electrically connected to the counting and analyzing module.

5. A lightning arrester discharge counter according to claim 4, characterized in that: The signal conversion circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor and a triode; wherein: The first end of the first resistor is electrically connected to the first end of the TVS diode, and the second end of the first resistor is electrically connected to the first end of the second resistor; The second end of the second resistor is electrically connected to the second end of the TVS diode; The second end of the first resistor is electrically connected to the base of the transistor; The emitter of the transistor is electrically connected to the first end of the third resistor; The second end of the third resistor is electrically connected to the second end of the TVS diode; The first end of the fourth resistor is connected to the power supply, and the second end thereof is electrically connected to the collector of the transistor as the output end of the signal conversion circuit.

6. A lightning arrester discharge counter according to any one of claims 1 to 5, characterized in that: It also includes a current comparison module, which is used to preset a current lower limit threshold and collect current signals during the discharge process of the lightning arrester to transmit current signals that are not less than the current lower limit threshold to the pulse extraction module.

7. A lightning arrester discharge counter according to any one of claims 1 to 5, characterized in that: The counting and analyzing module includes a pulse current sensor, which is used to respond to a discharge pulse sequence and perform counting to obtain a discharge counting result.

8. A lightning arrester discharge counter according to claim 7, characterized in that: The counting and analysis module also includes a central processing unit, which is used to respond to the discharge pulse sequence and discharge counting results of the pulse current sensor, store and analyze the discharge pulse sequence and discharge counting results, and obtain the discharge event corresponding to each discharge pulse sequence.

9. A lightning arrester discharge monitoring method, characterized in that: The method is implemented by using a lightning arrester discharge counter as claimed in any one of claims 1 to 8, comprising the following steps: Collect the current signal during the discharge process of the arrester and extract the pulse current in the current signal to obtain the pulse voltage signal; Acquiring a discharge pulse sequence based on the pulse voltage signal; A counting operation is performed based on the discharge pulse sequence to obtain a discharge counting result.

10. A lightning arrester discharge monitoring method according to claim 9, characterized in that: Also includes: The discharge pulse sequence and the discharge counting result are stored and analyzed to obtain the discharge event corresponding to each discharge pulse sequence.

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