Zinc oxide arrester fault detection method and detection device

Abstract

The invention relates to the technical field of electrical equipment detection, in particular to a zinc oxide arrester fault detection method and device, and the device comprises a zinc oxide arrester detection host, a reference current transformer, a second current transformer and a third current transformer. The zinc oxide arrester detection host comprises a first current transformer, a current acquisition unit, a main control unit, a remote communication unit, an interface unit and a power supply unit, and the reference current transformer, the second current transformer and the third current transformer are connected with the zinc oxide arrester detection host. According to the invention, fault detection can be carried out on the zinc oxide lightning arrester without power failure of the power transmission line, the power failure loss of the power transmission line is reduced, and the operation is simple and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment detection, and particularly relates to a zinc oxide arrester fault detection device and a zinc oxide arrester fault detection method. Background Art

[0002] The arrester is connected between the cable and the ground, usually in parallel with the protected equipment, and can effectively protect the safe operation of the power grid. Once an abnormal voltage appears, the arrester will act and play a protective role for the power grid. When the transmission circuit operates under the normal working voltage, the arrester will not take effect and is regarded as an open circuit to the ground. Once a high voltage appears and endangers the insulation of the protected equipment, the arrester will act immediately, guiding the high-voltage impulse current to the ground, thereby limiting the voltage amplitude. After the overvoltage disappears, the arrester quickly returns to its original state, enabling the transmission circuit to work normally. The arrester is an important device for the safe operation of the power grid.

[0003] The life and performance of the arrester will decline due to the number of operations and weather conditions. Therefore, the real-time detection of the arrester is becoming increasingly important. There are two existing ways to use a zinc oxide arrester detection device. One is to install a closed current transformer on the grounding wire at the lower end of the zinc oxide arrester when the line is powered off to detect the current, and judge the performance and state of the zinc oxide arrester based on the magnitude of the current and the phase difference between this current and the reference current; the other is to use a high-voltage insulating rod to clamp an open current transformer on the grounding wire at the lower end of the zinc oxide arrester when the line is under the non-powered-off state, read its current value, judge the performance and state of the zinc oxide arrester, and then use the high-voltage insulating rod to remove the open current transformer to complete this detection. The first device needs to power off the line to install and detect, and the second device cannot detect the zinc oxide arrester for a long time. Once the operator leaves the site, it cannot be detected. Summary of the Invention

[0004] Object of the Invention: To solve the above technical problems, the present invention provides a zinc oxide arrester fault detection device and method, which can detect the faults of the zinc oxide arrester when the transmission line is not powered off. The present invention adopts a combined power supply method of a photovoltaic solar panel and a lithium battery, and can continuously collect and monitor the faults of the zinc oxide arrester on the line on a daily basis, with a longer monitoring time. Moreover, according to the detection method of the present application, the state of the zinc oxide arrester can be monitored more accurately. The present invention takes into account both the flexibility and simplicity of operation and the accuracy of monitoring data.

[0005] Technical Solution: To achieve the above object, the present invention is realized through the following technical solutions:

[0006] On the one hand, the present invention provides a zinc oxide arrester fault detection method, which includes:

[0007] Connect the reference current transformer to the zinc oxide arrester to be detected;

[0008] Use an insulating rod to clamp the split-core current transformer in the reference current transformer onto the grounding wire of the cable insulation layer;

[0009] Use the insulating rod to clamp several current transformers in the detection host onto the grounding wires of the corresponding zinc oxide arresters to be detected, so as to obtain corresponding current signals and corresponding reference signals;

[0010] The detection host calculates the amplitude and included angle of the current signal and the reference current signal once per second. Since the reference signal can be referenced by phase A, or phase B or phase C, it is determined according to the actual situation on site, and the included angle data needs to be converted before use. That is:

[0011] If(240°>φ 测量值 >120°)φ 转换值 =φ 测量值 -120°

[0012] If(360°>φ 测量值 >240°)φ 转换值 =φ 测量值 -240°

[0013] Calculate the minute average value of the amplitude and included angle of the current signal once per minute, so as to calculate the hourly average value and daily average value through the minute average value of the amplitude and included angle of the current signal;

[0014] Detect the zinc oxide arrester and judge the aging trend according to the hourly average value, daily average value, daily maximum value and daily minimum value of the amplitude and included angle of the current signal and the change of the current amplitude increment. The update method of the daily maximum value is: calculate the average value of the latest 60 second data every 1 second to obtain the corresponding sliding value, and then compare the sliding value with the current daily maximum value. If the sliding value is larger than the current daily maximum value, it becomes the new daily maximum value, otherwise, the current daily maximum value remains the current daily maximum value; The update method of the daily minimum value is: calculate the average value of the latest 60 second data every 1 second to obtain the corresponding sliding value, and then compare the sliding value with the current daily minimum value. If the sliding value is smaller than the current daily minimum value, it becomes the new daily minimum value, otherwise, the current daily minimum value remains the current daily minimum value.

[0015] Further, it includes:

[0016] The hourly average value and daily average value of the amplitude and included angle of the current signal include:

[0017] Calculate the hourly average value from the minute average value every hour, that is:

[0018] I小时平均值 = avg(I 分钟平均值 (t)), where t = 1, 2,..., 60, and avg is the average function;

[0019] The hourly average value of the included angle is calculated from the minute average data, that is:

[0020] φ 小时平均值 = avg(φ 分钟平均值 (t)), where t = 1, 2,..., 60, and avg is the average function;

[0021] Among them, the minute average value of the current amplitude I 分钟平均值 (t) = avg(I(t)), where t = 1, 2,..., 60, and avg is the average function;

[0022] The minute average value of the included angle is calculated from 60 second data per minute, that is:

[0023] φ 分钟平均值 = avg(φ(t)), where t = 1, 2,..., 60, and avg is the average function.

[0024] Furthermore, it includes:

[0025] Detecting and judging the zinc oxide arrester according to the hourly average value, daily average value, daily maximum value, and daily minimum value of the amplitude and included angle of the current signal includes:

[0026] Showing the daily maximum value and daily minimum value of the amplitude and included angle of the current signal, that is:

[0027] I 日最大值 = max( I 滑差值 (t) ), where t = 1, 2,..., 1440, and max is the maximum function;

[0028] φ 日最大值 = max(φ 滑差值 (t) ), where t = 1, 2,..., 1440, and max is the maximum function;

[0029] I 日最小值 = min( I 滑差值 (t) ), where t = 1, 2,..., 1440, and min is the minimum function;

[0030] φ 日最小值 = min(φ 滑差值 (t)), where t = 1, 2,..., 1440, and min is the minimum function;

[0031] Detecting the zinc oxide lightning arrester according to the daily average value, daily maximum value and daily minimum value of the amplitude and included angle of the current signal, including:

[0032] The amplitude of the current that the zinc oxide lightning arrester to be detected can normally pass through is I 上限值 , when the zinc oxide lightning arrester to be detected is in a normal working state, it should satisfy:

[0033] , otherwise, the zinc oxide lightning arrester is in a fault state;

[0034] The normal minimum current angle of the zinc oxide lightning arrester is φ 下限值 , when the zinc oxide lightning arrester is in a normal working state, it should satisfy:

[0035] Otherwise, the zinc oxide lightning arrester is in a fault state.

[0036] Furthermore, it includes:

[0037] Judging the aging trend of the zinc oxide lightning arrester to be detected according to the second data curve of the current signal includes:

[0038] Performing discrete wavelet transform on the second data curve of the current signal to find out the accelerated aging characteristics of the zinc oxide lightning arrester. When the eigenvalue reaches more than 60%, a prompt message is obtained. Add this zinc oxide lightning arrester to the pre - plan scope.

[0039] Performing discrete wavelet transform on the second data curve of the current signal means:

[0040] Features = WAVECONV(signal, wavelet, level = 60%);

[0041] Where, Features is the eigenvalue, WAVECONV is the discrete wavelet transform function, signal is the second data curve of the current signal, and wavelet is the aging characteristic waveform.

[0042] Furthermore, it includes:

[0043] One of the several current transformers is arranged in the detection host, denoted as the first current transformer, to realize the detection of a single zinc oxide lightning arrester to be measured, specifically including:

[0044] Connect the reference current transformer to the zinc oxide lightning arrester;

[0045] Clamp the split - core current transformer in the reference current transformer to the cable insulation layer grounding wire through an insulating rod;

[0046] Use the insulating rod to clamp the first current transformer in the zinc oxide arrester detection host onto the ground wire of the zinc oxide arrester;

[0047] Obtain the first current signal of the zinc oxide arrester according to the zinc oxide arrester detection host;

[0048] Obtain the reference current signal according to the reference current transformer;

[0049] Detect a single zinc oxide arrester to be tested according to the amplitudes and included angles of the first current signal and the reference current signal.

[0050] Furthermore, it includes:

[0051] The several current transformers include two. One is arranged inside the detection host, and the other is connected to the detection host, which are respectively denoted as the first current transformer and the second current transformer, to realize the detection of two zinc oxide arresters to be tested. Specifically, it includes:

[0052] When performing fault detection on two zinc oxide arresters, use the insulating rod to clamp the split-core current transformer in the second current transformer onto the ground wire of the second zinc oxide arrester;

[0053] Obtain the second current signal according to the zinc oxide arrester detection host;

[0054] Calculate the amplitudes and included angles of the first current signal, the second current signal, and the reference current signal through the main control chip in the zinc oxide arrester detection host;

[0055] Detect two zinc oxide arresters according to the amplitudes and included angles of the first current signal, the second current signal, and the reference current signal.

[0056] Furthermore, it includes:

[0057] The several current transformers include three. One is arranged inside the detection host, and the other two are connected to the detection host, which are respectively denoted as the first current transformer, the second current transformer, and the third current transformer, to realize the detection of three zinc oxide arresters to be tested. Specifically, it includes:

[0058] When performing fault detection on three zinc oxide arresters, use the insulating rod to clamp the split-core current transformer in the third current transformer onto the ground wire of the third zinc oxide arrester;

[0059] Obtain the third current signal according to the zinc oxide arrester detection host;

[0060] The main control chip in the zinc oxide arrester detection host calculates the amplitudes and included angles of the first current signal, the second current signal, the third current signal, and the reference current signal;

[0061] The three zinc oxide arresters are detected according to the amplitudes and included angles of the first current signal, the second current signal, the third current signal, and the reference current signal.

[0062] In a second aspect, the present invention also provides a zinc oxide arrester fault detection device, which includes:

[0063] A detection host, a reference current transformer, and several current transformers externally connected to the detection host. The detection host includes a first current transformer, a current acquisition unit, and a main control unit. The reference current transformer and the several externally connected current transformers are connected to the detection host. The current acquisition unit includes a reference current amplification circuit, a plurality of current amplification circuits, and a metering circuit. The input end of the reference current amplification circuit is connected to the output end of the reference current transformer, and the output end of the reference current amplification circuit is connected to the input end of the metering circuit. The plurality of current amplification circuits are connected to the first current transformer of the detection host and the several externally connected current transformers, and the outputs of the plurality of current amplification circuits are connected to the metering circuit. The main control unit is used to collect the current amplitude and included angle corresponding to each current amplification circuit and perform detection and processing.

[0064] Further, it includes:

[0065] The several current transformers externally connected to the detection host include two, which are respectively denoted as the second current transformer and the third current transformer. The plurality of current amplification circuits include three, specifically:

[0066] A first current amplification circuit, the input end of the first current amplification circuit is connected to the output end of the first current transformer, and the output end of the first current amplification circuit is connected to the A-phase current input end of the metering circuit;

[0067] A second current amplification circuit, the input end of the second current amplification circuit is connected to the output end of the second current transformer, and the output end of the second current amplification circuit is connected to the B-phase current input end of the metering circuit;

[0068] A third current amplification circuit, the input end of the third current amplification circuit is connected to the output end of the third current transformer, and the output end of the third current amplification circuit is connected to the C-phase current input end of the metering circuit.

[0069] Further, it includes:

[0070] The current transformer is an open-type current transformer. The inner diameter of the opening of the open-type current transformer is 48 mm, and a spring buckle is provided at the inner diameter of the open-type current transformer.

[0071] Advantageous effects: Compared with the prior art, the following advantageous effects are achieved:

[0072] The fault monitoring method of the present invention can continuously collect and monitor the faults of zinc oxide arresters on the line on a daily basis. The monitoring time is longer, and the state monitoring of zinc oxide arresters is more accurate. The calculation method of the daily average value of the current amplitude and angle is to take the average value of the current amplitude and angle corresponding to the hourly average value in 24 hours respectively, and the calculation method of the daily average value of the current amplitude and angle is to take the average value of the current amplitude and angle corresponding to the minute average value in 60 minutes respectively, and the minute average value of the current amplitude and angle is to take the average value of the current amplitude and angle corresponding to the second average value in 60 seconds respectively. The data calculated by this method of taking the average value in a loop is more accurate, laying a data foundation for the subsequent fault prediction.

[0073] The zinc oxide arrester fault detection method proposed by the present invention mainly detects the zinc oxide arrester according to the hourly average value, daily average value, daily maximum value, daily minimum value of the amplitude and angle of the current signal, and the change of the current amplitude increment. By calculating with a slip of 1 minute every day, that is, calculating the average value of the latest 60 second data every 1 second, and then comparing with the daily maximum value and minimum value to obtain the current daily maximum value and minimum value. The slip calculation can effectively smooth the data and reduce the influence of the sudden fluctuation of the collected data, thereby improving the calculation efficiency and the accuracy of trend judgment.

[0074] The detection method of the present invention also realizes the accurate detection of the reference current signal. Existing technologies such as the ones with publication numbers CN109470952A and CN219676159U use the reference current transformer as the comparison data for real-time error data with the current transformer, but do not consider how to monitor when the reference current transformer itself or the surrounding circuit fails and causes the reference current signal to be abnormal. Obviously, this is a potential threat to the detection data. This application uses a multi-dimensional angle judgment method to monitor the reference current signal data in real time, improving the monitoring accuracy while ensuring the data validity and detection accuracy of the arrester to be detected.

[0075] Moreover, in the present invention, the reference current transformer, the second current transformer, and the third current transformer are connected to the zinc oxide arrester detection host, and the amplitude and angle of the current signals of the reference current transformer, the second current transformer, and the third current transformer are calculated by the zinc oxide arrester detection host to detect the zinc oxide arrester. Thus, it is possible to detect the faults of the zinc oxide arrester without power outage of the transmission line, reducing the losses caused by the power outage of the transmission line, and the operation is simple and convenient. Description of the Drawings

[0076] Figure 1 It is a block diagram of a zinc oxide lightning arrester fault detection device according to an embodiment of the present invention;

[0077] Figure 2 It is a flowchart of a zinc oxide lightning arrester fault detection method according to an embodiment of the present invention. Detailed Embodiments

[0078] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0079] Embodiment 1

[0080] The present invention provides a zinc oxide lightning arrester fault detection device, which includes: a detection host, a reference current transformer, and a plurality of current transformers externally connected to the detection host. The detection host includes a first current transformer, a current acquisition unit, and a main control unit. The reference current transformer and the plurality of externally connected current transformers are connected to the detection host. The current acquisition unit includes a reference current amplification circuit, a plurality of current amplification circuits, and a metering circuit. The input end of the reference current amplification circuit is connected to the output end of the reference current transformer, and the output end of the reference current amplification circuit is connected to the input end of the metering circuit. The plurality of current amplification circuits are connected to the first current transformer of the detection host and the plurality of externally connected current transformers, and the outputs of the plurality of current amplification circuits are connected to the metering circuit. The main control unit is used to collect the current amplitude and phase angle corresponding to each current amplification circuit and perform detection and processing.

[0081] The plurality of current transformers include one, which is arranged in the detection host and is denoted as the first current transformer to realize the detection of a single zinc oxide lightning arrester to be measured. Specifically, it includes:

[0082] Connect the reference current transformer to the zinc oxide lightning arrester;

[0083] Clamp the split-core current transformer in the reference current transformer to the cable insulation layer grounding wire through an insulating rod;

[0084] Clamp the first current transformer in the zinc oxide lightning arrester detection host to the grounding wire of the zinc oxide lightning arrester through the insulating rod;

[0085] Obtain the first current signal of the zinc oxide lightning arrester according to the zinc oxide lightning arrester detection host;

[0086] Obtain the reference current signal according to the reference current transformer;

[0087] Detect a single zinc oxide lightning arrester to be detected according to the amplitudes and included angles of the first current signal and the reference current signal.

[0088] Further, this embodiment further includes:

[0089] The several current transformers include two. One is arranged in the detection host, and the other is connected to the detection host, which are respectively denoted as the first current transformer and the second current transformer to realize the detection of two zinc oxide lightning arresters to be detected. Specifically, it includes:

[0090] When performing fault detection on two zinc oxide lightning arresters, use the insulating rod to clamp the split-core current transformer in the second current transformer to the ground wire of the second zinc oxide lightning arrester;

[0091] Obtain the second current signal according to the zinc oxide lightning arrester detection host;

[0092] Calculate the amplitudes and included angles of the first current signal, the second current signal and the reference current signal through the main control chip in the zinc oxide lightning arrester detection host;

[0093] Detect two zinc oxide lightning arresters according to the amplitudes and included angles of the first current signal, the second current signal and the reference current signal.

[0094] Further, it includes:

[0095] The several current transformers include three. One is arranged in the detection host, and the other two are connected to the detection host, which are respectively denoted as the first current transformer, the second current transformer and the third current transformer to realize the detection of three zinc oxide lightning arresters to be detected. Specifically, it includes:

[0096] When performing fault detection on three zinc oxide lightning arresters, use the insulating rod to clamp the split-core current transformer in the third current transformer to the ground wire of the third zinc oxide lightning arrester;

[0097] Obtain the third current signal according to the zinc oxide lightning arrester detection host;

[0098] Calculate the amplitudes and included angles of the first current signal, the second current signal, the third current signal and the reference current signal through the main control chip in the zinc oxide lightning arrester detection host;

[0099] Detect the three zinc oxide arresters according to the amplitudes and included angles of the first current signal, the second current signal, the third current signal and the reference current signal.

[0100] As Figure 1 shown, the zinc oxide arrester fault detection device according to the embodiment of the present invention includes: a zinc oxide arrester detection host 100, a reference current transformer 200, a second current transformer 300 and a third current transformer 400. The zinc oxide arrester detection host 100 includes a first current transformer 101, a current acquisition unit 102, a main control unit 103, a remote communication unit 104, an interface unit 105 and a power supply unit 106. The reference current transformer 200, the second current transformer 300 and the third current transformer 400 are connected to the zinc oxide arrester detection host 100.

[0101] In an embodiment of the present invention, the first current transformer 101, the second current transformer 300 and the third current transformer 400 may all be split-core current transformers. Among them, the inner diameter of the opening of the split-core current transformer may be 48 mm, and a spring buckle may be provided at the inner diameter of the split-core current transformer. When the split-core current transformer is clamped to the ground wire outlet of the zinc oxide arrester, the spring buckle can be triggered to clamp the ground wire, thereby fixing the first current transformer 101, the second current transformer 300 and the third current transformer 400, so that the first current transformer 101, the second current transformer 300 and the third current transformer 400 will not slide back and forth on the ground wire outlet of the zinc oxide arrester with the size of the environmental wind force, causing equipment damage. Among them, the first current transformer 101, the second current transformer 300, the third current transformer 400 and the zinc oxide arrester detection host 100 may be integrally designed. While fixing the first current transformer 101, the second current transformer 300 and the third current transformer 400, the zinc oxide arrester detection host 100 is also fixed.

[0102] In an embodiment of the present invention, the output signals of the first current transformer 101, the second current transformer 300 and the third current transformer 400 may be directly connected to the current input end of the current acquisition unit 102 of the zinc oxide arrester detection host 100.

[0103] In an embodiment of the present invention, the two half-cores of the openings of the first current transformer 101, the second current transformer 300 and the third current transformer 400 may all be potted with AB epoxy glue.

[0104] In an embodiment of the present invention, the current acquisition unit 102 may include four current amplification circuits and one metering circuit. Among them, the current amplification circuits may include a reference current amplification circuit, a first current amplification circuit, a second current amplification circuit, and a third current amplification circuit. Among them, the input end of the reference current amplification circuit may be connected to the output end of the reference current transformer 200, and the output end of the reference current amplification circuit may be connected to the input end of the metering circuit; the input end of the first current amplification circuit may be connected to the output end of the first current transformer 101, and the output end of the first current amplification circuit may be connected to the A-phase current input end of the metering circuit; the input end of the second current amplification circuit may be connected to the output end of the second current transformer 300, and the output end of the second current amplification circuit may be connected to the B-phase current input end of the metering circuit; the input end of the third current amplification circuit may be connected to the output end of the third current transformer 400, and the output end of the third current amplification circuit may be connected to the C-phase current input end of the metering circuit.

[0105] In an embodiment of the present invention, the metering circuit may adopt a metering chip of model ATT7022E to measure the amplitudes and phase angles of the input of the A-phase voltage (UA) and current signal (IA), the input of the B-phase voltage (UB) and current signal (IB), and the input of the C-phase voltage (UC) and current signal (IC) in the circuit.

[0106] In an embodiment of the present invention, the main control unit 103 may be used to collect the current amplitudes and included angles of the four current amplification circuits, report data, and manage the low power consumption of the power supply.

[0107] In an embodiment of the present invention, when the main control unit 103 detects an abnormality of the zinc oxide arrester, it may transmit the abnormal state of the zinc oxide arrester to the server platform through the remote communication unit 104; when the main control unit 103 detects that the zinc oxide arrester is normal, it may transmit the normal state of the zinc oxide arrester to the server platform through the remote communication unit 104.

[0108] In an embodiment of the present invention, the interface unit 105 may include 3 three-core aviation plugs, and the 3 three-core aviation plugs may be respectively connected to the reference current transformer 200, the second current transformer 300, and the third current transformer 400.

[0109] In an embodiment of the present invention, the power supply unit 106 may include a solar cell, a polymer lithium battery, and a charging circuit. The solar cell may charge the polymer lithium battery through the charging circuit. Among them, the solar cell may adopt a solar cell pasting component and be pasted on the outer shell of the zinc oxide arrester detection host 100.

[0110] According to the zinc oxide arrester fault detection device of the embodiment of the present invention, by connecting a reference current transformer, a second current transformer, and a third current transformer to a zinc oxide arrester detection host, and the main control chip in the zinc oxide arrester detection host calculates the amplitude and included angle of the current signals of the reference current transformer and the first current signal, the second current transformer, and the third current transformer every second, and stores them in the memory. The current amplitude (I A 、I B 、I C ) and the included angle value (φ A 、φ B 、φ C ) are each stored in int type, that is, each value occupies 4 bytes of storage space. The current amplitude (I A 、I B 、I C ) and the included angle value (φ A 、φ B 、φ C ) are stored in a circular queue manner in the memory, that is, when it is full, it is circularly stored from the first position, saving storage resource consumption.

[0111] In this embodiment, the detection host calculates the amplitude and included angle of the current signal and the reference current signal once per second, and the reference current signal is the current signal of phase A, phase B, or phase C in the three-phase current signal;

[0112] Specifically, since the reference signal can be referenced by phase A, phase B, or phase C, it is determined according to the actual situation on site, and it needs to be converted before using the included angle data. That is:

[0113] If(240°>φ 测量值 >120°)φ 转换值 =φ 测量值 -120°

[0114] If(360°>φ 测量值 >240°)φ 转换值 =φ 测量值 -240°

[0115] Calculate the minute average value of the amplitude and included angle of the corresponding current signals of the three phases once per minute, so as to calculate the hourly average value and daily average value of each phase through the minute average value of the amplitude and included angle of the current signal. The specific implementation method is:

[0116] Calculate the minute average value of the current amplitude from 60 second data per minute, that is:

[0117] I 分钟平均值 =avg(I(t)),, t = 1, 2,..., 60, where avg is the average value function.

[0118] Calculate the average value of the included angle per minute from 60 second data per minute, that is:

[0119] φ 分钟平均值 = avg(φ(t)), t = 1, 2,..., 60, where avg is the average value function.

[0120] The main control chip stores the average value per minute into the memory, storing 60 points.

[0121] Calculate the average value per hour from the average value per minute, that is:

[0122] I 小时平均值 = avg(I 分钟平均值 (t)), t = 1, 2,..., 60 where avg is the average value function.

[0123] Calculate the average value of the included angle per hour from the average data per minute, that is:

[0124] φ 小时平均值 = avg(φ 分钟平均值 (t)), t = 1, 2,..., 60. Where avg is the average value function.

[0125] The main control chip stores the average value per hour into the FALSH, storing 24 points per day.

[0126] Calculate the average value per day from the average value per hour, that is:

[0127] I 日平均值 = avg(I 小时平均值 (t)), t = 1, 2,..., 24 where avg is the average value function.

[0128] Calculate the average value of the included angle per day from the average data per hour, that is:

[0129] φ 日平均值 = avg(φ 小时平均值 (t)), t = 1, 2,..., 24. Where avg is the average value function.

[0130] The main control chip stores the average value per hour into the FALSH, storing 1 point per day.

[0131] In this embodiment, it is also necessary to calculate the initial daily maximum and minimum values of the amplitude and included angle of each phase current signal, and update the daily maximum and minimum values by using the slip calculation method to obtain the new current daily maximum and minimum values;

[0132] Perform leakage detection on the zinc oxide arrester according to the daily average value, the updated current daily maximum and minimum values;

[0133] The update method of the daily maximum value is as follows:

[0134] Taking the seconds of a fixed time as the unit, calculate the average value of its recent 60 second signal data to obtain the corresponding second slip difference. Calculate the second slip differences at multiple fixed times, and then compare the maximum value of the multiple slip differences with the initial daily maximum value. If the maximum value of the slip difference is larger than the initial daily maximum value, it becomes the new daily maximum value; otherwise, the daily maximum value remains the initial daily maximum value;

[0135] The update method of the daily minimum value is as follows:

[0136] Taking the seconds of a fixed time as the unit, calculate the average value of its recent 60 second signal data to obtain the corresponding second slip difference. Calculate the second slip differences at multiple fixed times, and then compare the minimum value of the multiple slip differences with the initial daily minimum value. If the minimum value of the slip difference is smaller than the initial daily minimum value, it becomes the new daily minimum value; otherwise, the daily minimum value remains the initial daily minimum value.

[0137] In this embodiment, the initial daily maximum value and the initial daily minimum value adopt a natural day, that is, from zero o'clock to twenty-four o'clock, the maximum value and the minimum value among the average values of each hour in 24 hours. Therefore, the maximum value can be expressed as: max{I 1avera , I 2avera ,..., I 24avera}, where I 1avera is the average value of the current signal amplitude of the first hour, and so on. I 24avera is the average value of the current signal amplitude of the 24th hour. And the corresponding minimum value is expressed as: min{I 1avera , I 2avera ,..., I 24avera}.

[0138] In this embodiment, another method can also be used to obtain the initial daily maximum value and the initial daily minimum value, that is, using the maximum value and the minimum value in the collected second data. For example, if the amplitude of the current signal corresponding to a certain second in a natural day is the largest, it is used as the initial daily maximum value. Correspondingly, the minimum value is used as the initial daily minimum value.

[0139] It should be noted that a natural day in this embodiment can be the data of the previous day or a certain day, or the predicted values of multiple days' data obtained according to neural networks or machine learning.

[0140] Based on the obtained initial daily maximum value and minimum value, in order to improve the accuracy of the data, slip difference calculation is used to update them to avoid data errors and omissions. To more conveniently understand the above update method, the following detailed description is made in this embodiment. Taking the update method of the daily maximum value as an example:

[0141] Taking the seconds of a fixed time as the unit, calculate the average value of its recent 60 second signal data to obtain the corresponding second slip difference. For example, taking a certain time point before in a day as the fixed time, such as 13:20:20 as the fixed time, calculate the amplitude of the current signal collected in the recent 60 seconds at this time and take its average value. In this embodiment, the recent 60 seconds can be 30 seconds before and after, or 20 seconds before and 40 seconds after, 60 seconds before, etc., as long as the total time span is 60 seconds. And in this embodiment, there is no complete restriction on this fixed time, it can be a time before this day, or a time not on the current day, or it can also be relevant data obtained after the detection host has learned through machine learning or neural network.

[0142] On this basis, calculate the second slip differences at multiple fixed times, and then compare the maximum value of the multiple slip differences with the initial day maximum value. If the maximum value of the slip difference is larger than the initial day maximum value, it becomes the new current day maximum value; otherwise, the current day maximum value remains the initial day maximum value.

[0143] For example, in the following update method, calculate with a 1-minute slip every day, that is: every 1 second, calculate the average value of the recent 60 second data, and then compare it with the current day maximum value and minimum value to obtain the current day maximum value and minimum value. That is, if the slip difference is larger than the current day maximum value, it becomes the new current day maximum value; if it is smaller than the current day minimum value, it becomes the new current day minimum value.

[0144] I 日最大值 = max(I 滑差值 (t)), t = 1, 2,..., 1440 where max is the maximum value function.

[0145] φ 日最大值 = max(φ 滑差值 (t)), t = 1, 2,..., 1440 where max is the maximum value function.

[0146] I 日最小值 = min(I 滑差值 (t)), t = 1, 2,..., 1440 where min is the minimum value function.

[0147] φ 日最小值 = min(φ 滑差值 (t)), t = 1, 2,..., 1440 where min is the minimum value function.

[0148] In this embodiment, the multiple fixed times are more than two fixed times, and the time difference between adjacent fixed times is greater than 1 minute, so that the calculation is more accurate and effective. Therefore, the maximum value of multiple sliding differences is used to update the new daily maximum value. The data update method using sliding differences can effectively smooth the data and reduce the influence of sudden fluctuations in the collected data, thereby improving the calculation efficiency and the accuracy of trend judgment.

[0149] The normal maximum passing current amplitude of the zinc oxide lightning arrester is I 上限值。 When the zinc oxide lightning arrester is in a normal working state, it should satisfy:

[0150] , otherwise, the zinc oxide lightning arrester is in a faulty state.

[0151] The normal minimum current angle of the zinc oxide lightning arrester is φ 下限值。 When the zinc oxide lightning arrester is in a normal working state, it should satisfy:

[0152] , otherwise, the zinc oxide lightning arrester is in a faulty state.

[0153] Therefore, according to the hourly average value, daily average value, daily maximum value and daily minimum value of the amplitude and included angle of the first current signal, the zinc oxide lightning arrester is detected. Thus, the zinc oxide lightning arrester can be fault-detected without power outage of the transmission line, reducing the loss of power outage of the transmission line, and the operation is simple and convenient.

[0154] The detection method in this embodiment also includes considering the effectiveness of the reference current signal value. One method used is: the amplitude of the reference current signal collected at the current moment is compared with the corresponding data of the previous second respectively. If the difference between the data at the current moment and the corresponding data of the previous second is within an acceptable range, they are all valid data; otherwise, the data at the current moment is recorded as preliminary abnormal data;

[0155] The preliminary abnormal data is compared with the amplitude of the current signal collected by the current transformer at this moment, that is, the amplitude of the real-time current signal collected by the first current transformer, the second current transformer or the third current transformer in this embodiment. If it is within an acceptable range, then according to the state of the amplitude of the corresponding real-time current signal, that is, if the amplitude of the collected real-time current signal is greater than the maximum value of the current amplitude, it is in a faulty state, otherwise, it is in a normal state, and the validity of the amplitude of the current reference signal at the current moment is judged accordingly; otherwise,

[0156] If the difference between the preliminary abnormal data and the amplitude of the current signal collected by the current transformer at this moment is not within an acceptable range, it is further determined whether it is a problem of the preliminary abnormal data or a problem of the collected signal.

[0157] This embodiment can be further judged in the following manner:

[0158] Compare the amplitude of the reference current signal in the previous second with the amplitude of the current signal collected by the current transformer at the current moment. If the two are the same or within an acceptable range, it is determined that the amplitude of the reference current signal at this moment is abnormal data. Otherwise, if the two are not within the acceptable range, it is determined that the currently collected signal is in a fault state, and the amplitude of the reference current signal at this moment is also abnormal data.

[0159] If the judged reference current signal is abnormal data, it is necessary to perform fault diagnosis on it, investigate the cause, and replace it in time. The above-mentioned acceptable range or unacceptable range in this embodiment can be data set by skilled technicians based on experience, or more accurate data obtained through big data learning. This embodiment does not make any restrictions again.

[0160] It should be noted that the above method is only one implementation manner. There are reasons to choose other simpler and more effective ways to judge the effective value of the reference current signal. There are similar judgment methods for the amplitude and angle of the current signal. For the sake of brevity, this application will not elaborate. And it is obvious that the detection host needs to collect relevant data values in real time, so this embodiment will not elaborate here.

[0161] And the zinc oxide arrester fault detection device proposed by the present invention mainly detects the zinc oxide arrester according to the hourly average value, daily average value, daily maximum value and daily minimum value of the amplitude and included angle of the first current signal, as well as the change of the current amplitude increment. By calculating with a slip of 1 minute every day, that is: every 1 second, calculate the average value of the latest 60 second data, and then compare it with the daily maximum value and minimum value to obtain the current daily maximum value and minimum value. The slip calculation can effectively smooth the data and reduce the influence of the sudden fluctuation of the collected data, thereby improving the calculation efficiency and the accuracy of trend judgment.

[0162] In addition, in the embodiment of the present invention, it is proposed to perform discrete wavelet transform on the second curve of the leakage current amplitude of the arrester to find out the characteristics of the accelerated aging of the zinc oxide arrester. When the characteristic value reaches above the set threshold, a prompt message is obtained. This zinc oxide arrester is included in the pre-plan scope. Take corresponding maintenance measures to ensure the safe operation of the power system.

[0163] Specifically, judging the aging trend of the zinc oxide arrester to be detected according to the second data curve of the current signal includes:

[0164] Perform discrete wavelet transform on the second data curve of the current signal to find out the characteristics of the accelerated aging of the zinc oxide arrester. When the characteristic value reaches above 60%, a prompt message is obtained. This zinc oxide arrester is included in the pre-plan scope.

[0165] Perform discrete wavelet transform on the current signal second data curve, that is:

[0166] Features = WAVECONV(signal, wavelet, level = 60%);

[0167] Where Features is the eigenvalue, WAVECONV is the discrete wavelet transform function, signal is the current signal second data curve, and wavelet is the aging characteristic waveform.

[0168] It should be noted that the current signal second data here obviously includes multiple monitoring data such as amplitude and angle, and only the implementation method of one phase, such as phase A, is described in the previous part of this application. The monitoring methods of other phases are similar and will not be elaborated here.

[0169] Moreover, it should be emphasized here that the above is only one way of fault detection and can be implemented. For example, the detection host constructs a historical data model and trains the model until it is optimal. On the basis of this model, the current data is predicted, which is a preferred implementation method of this embodiment. The above is only an elaboration of the detection method and not all implementation forms.

[0170] Embodiment 2

[0171] For the zinc oxide arrester fault detection device in the above embodiment, the present invention also proposes a zinc oxide arrester fault detection method.

[0172] As Figure 2 shown, it includes the following steps:

[0173] S1. Connect the reference current transformer to the zinc oxide arrester.

[0174] S2. Use an insulating rod to clamp the split current transformer in the reference current transformer to the cable insulation layer grounding wire.

[0175] S3. Use an insulating rod to clamp the first current transformer in the zinc oxide arrester detection host to the grounding wire of the zinc oxide arrester.

[0176] S4. Obtain the first current signal of the zinc oxide arrester according to the zinc oxide arrester detection host.

[0177] S5. Obtain the reference current signal according to the reference current transformer.

[0178] S6. The main control chip in the zinc oxide arrester detection host calculates the amplitude and included angle of the first current signal and the reference current signal once per second, calculates the minute average value of the amplitude and included angle of the first current signal once per minute, and calculates the hourly average value and daily average value based on the minute average value of the amplitude and included angle of the first current signal.

[0179] S7. Detect the zinc oxide arrester and judge the aging trend according to the hourly average value and daily average value of the amplitude and included angle of the first current signal, the daily maximum value and daily minimum value, and the change of the current amplitude increment.

[0180] In an embodiment of the present invention, when detecting the faults of two zinc oxide arresters, it specifically may include: clamping the split current transformer in the second current transformer to the ground wire of the second zinc oxide arrester through an insulating rod; obtaining the second current signal according to the zinc oxide arrester detection host; calculating the amplitude and included angle of the first current signal, the second current signal and the reference current signal through the main control chip in the zinc oxide arrester detection host; detecting the two zinc oxide arresters according to the amplitude and included angle of the first current signal, the second current signal and the reference current signal.

[0181] In an embodiment of the present invention, when detecting the faults of three zinc oxide arresters, it specifically may include: clamping the split current transformer in the third current transformer to the ground wire of the third zinc oxide arrester through an insulating rod; obtaining the third current signal according to the zinc oxide arrester detection host; calculating the amplitude and included angle of the first current signal, the second current signal, the third current signal and the reference current signal through the main control chip in the zinc oxide arrester detection host; detecting the three zinc oxide arresters according to the amplitude and included angle of the first current signal, the second current signal, the third current signal and the reference current signal.

[0182] In an embodiment of the present invention, the reference current signal may be connected to the metering circuit through a reference current amplification circuit as the UA voltage input signal, UB voltage input signal and UC voltage input signal in the metering circuit.

[0183] In an embodiment of the present invention, the first current signal may be connected to the metering circuit through a first current amplification circuit as the IA current input signal of the metering circuit; the second current signal may be connected to the metering circuit through a second current amplification circuit as the IB current input signal of the metering circuit; the third current signal may be connected to the metering circuit through a third current amplification circuit as the IC current input signal of the metering circuit.

[0184] In summary, in the present invention, a reference current transformer is connected to a zinc oxide arrester, and then the split-core current transformer in the reference current transformer is clamped onto the grounding wire of the cable insulation layer, and the first current transformer in the zinc oxide arrester detection host is clamped onto the grounding wire of the zinc oxide arrester. The first current signal of the zinc oxide arrester is obtained according to the zinc oxide arrester detection host, the reference current signal is obtained according to the reference current transformer, and the amplitudes and included angles of the first current signal and the reference current signal are calculated by the main control chip in the zinc oxide arrester detection host. Finally, the zinc oxide arrester is detected according to the amplitudes and included angles of the first current signal and the reference current signal. Thus, the fault detection of the zinc oxide arrester can be carried out without power outage of the transmission line, the loss caused by the power outage of the transmission line is reduced, and the operation is simple and convenient.

[0185] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. The meaning of "a plurality" is two or more unless otherwise specifically defined.

[0186] In the present invention, unless otherwise clearly defined and limited, the terms such as "installation", "connection", "connection", "fixation" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0187] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher level than the second feature in terms of horizontal height. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature in terms of horizontal height.

[0188] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0189] Any process or method description shown in the flowchart or described in other ways herein can be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a specific logical function or process, and the scope of the preferred embodiments of the present invention includes additional implementations, where the functions may be executed in a manner not shown or discussed, including in a substantially simultaneous manner or in a reverse order according to the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

[0190] The logic and / or steps represented in the flowchart or described in other ways herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical function, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or in connection with these instruction execution systems, apparatuses, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of the computer-readable medium include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or other suitable processing as necessary, and then stored in a computer memory.

[0191] It should be understood that various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits with logic gate circuits for implementing logical functions on data signals, application specific integrated circuits with appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0192] Those of ordinary skill in the art can understand that all or part of the steps carried by the method of the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0193] In addition, each functional unit in various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically alone, or two or more units can be integrated into one module. The above integrated module can be implemented in the form of hardware or in the form of a software functional module. When the above integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0194] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A zinc oxide arrester fault detection method, characterized in that: The method includes: Connecting a reference current transformer to the zinc oxide arrester to be tested; The insulating rod clamps the open current transformer in the reference current transformer to the grounding wire of the cable insulation layer; The insulating rod clamps several current transformers in the detection host to the ground wire of the corresponding zinc oxide lightning arrester to be detected, thereby obtaining the corresponding current signal; The detection host calculates the amplitude and angle of the current signal and the reference current signal once per second, and the reference current signal is the A-phase, B-phase or C-phase current signal in the three-phase current signal; Calculate the minute average values ​​of the amplitudes and angles of the current signals corresponding to the three phases once every minute, so as to calculate the hourly average value and daily average value of each phase through the minute average values ​​of the amplitudes and angles of the current signals; Calculate the initial daily maximum and daily minimum values ​​of the amplitude and angle of each phase current signal, and update the daily maximum and daily minimum values ​​using a slip calculation method to obtain new daily maximum and daily minimum values; Perform leakage detection on the zinc oxide lightning arrester according to the daily average value, the updated maximum value of the day and the minimum value of the day; The updating method of the daily maximum value is: Taking the second of the fixed time as the unit, calculate the average value of the signal data of the last 60 seconds to obtain the corresponding second slip value, calculate the second slip values ​​under multiple fixed times, and then compare the maximum value of the multiple slip values ​​with the initial daily maximum value. If the maximum value of the slip value is greater than the initial daily maximum value, it becomes the new maximum value of the day, otherwise, the maximum value of the day is still the initial daily maximum value; The daily minimum value is updated in the following way: Taking seconds of a fixed time as the unit, calculate the average value of the signal data of the last 60 seconds to obtain the corresponding second slip value, calculate the second slip values ​​under multiple fixed times, and then compare the minimum value of the multiple slip values ​​with the initial daily minimum value. If the minimum value of the slip value is smaller than the initial daily minimum value, it becomes the new daily minimum value. Otherwise, the daily minimum value remains the initial daily minimum value.

2. The zinc oxide arrester fault detection method according to claim 1, characterized in that: The hourly average value and daily average value of the amplitude and angle of the current signal include: The daily average is calculated from the hourly average, that is: I 日平均值＝ avg(I 小时平均值 (t)), t = 1, 2, ..., 24, where avg is the averaging function; The daily average angle is calculated from the hourly average data, that is: φ 日平均值＝ avg(φ 小时平均值 (t)), t = 1, 2, ..., 24, where avg is the averaging function; Among them, the hourly average is calculated from the minute average, that is: I 小时平均值＝ avg(I 分钟平均值 (t)), t = 1, 2, ..., 60, where avg is the averaging function; The hourly average value of the angle is calculated from the minute average data every hour, that is: φ 小时平均值＝ avg(φ 分钟平均值 (t)), t = 1, 2, ..., 60, where avg is the averaging function; Among them, the minute average value of the current amplitude is calculated from 60 seconds of data every minute, that is: I 分钟平均值 (t) ＝ avg(I(t)), t=1, 2, ..., 60, where avg is an averaging function and I(t) is the amplitude of the current signal obtained per second; The minute average value of the angle is calculated from 60 seconds of data every minute, that is: φ 分钟平均值＝ avg(φ(t)), t=1, 2, ..., 60, where avg is an averaging function and φ(t) is the angle value of the current signal obtained every second.

3. The zinc oxide arrester fault detection method according to claim 1, characterized in that: The method further includes: The data of the reference current signal collected at the current moment are compared with the corresponding data of the previous second. If the difference between the data at the current moment and the corresponding data of the previous second is within an acceptable range, both are valid data; otherwise, the data at the current moment is recorded as preliminary abnormal data; Comparing the preliminary abnormal data with corresponding data of the current signal collected by the current transformer at that moment, so as to further determine whether the preliminary abnormal data is abnormal data or valid data; If the reference current signal is judged to be abnormal data, a fault diagnosis needs to be performed on it.

4. The zinc oxide arrester fault detection method according to claim 2, characterized in that: The detecting of the zinc oxide arrester according to the daily average value, daily maximum value and daily minimum value of the amplitude and angle of the current signal comprises: The maximum current amplitude of the zinc oxide arrester to be tested is I 上限值 , when the zinc oxide arrester to be tested is in normal working condition, it should meet the following conditions: On the contrary, the zinc oxide arrester is in a faulty state; The normal minimum current angle of zinc oxide arrester is φ 下限值 , the zinc oxide arrester should meet the following requirements when in normal working condition: Otherwise, the zinc oxide arrester is in a fault state.

5. The zinc oxide arrester fault detection method according to claim 1, characterized in that: The method further includes: judging the aging trend of the zinc oxide arrester to be detected according to the obtained current signal second data curve, including: The current signal second data curve is subjected to discrete wavelet transformation to find out the accelerated aging characteristics of zinc oxide lightning arresters. When the characteristic value reaches a certain threshold, a prompt message is obtained and the zinc oxide lightning arrester to be tested is included in the scope of the emergency plan.

6. The zinc oxide arrester fault detection method according to claim 1, characterized in that: The plurality of current transformers include one, which is arranged in the detection host, recorded as a first current transformer, and realizes the detection of a single zinc oxide lightning arrester to be tested, specifically including: Connecting a reference current transformer to the zinc oxide arrester; Clamp the open current transformer in the reference current transformer onto the grounding wire of the cable insulation layer through an insulating rod; The first current transformer in the zinc oxide lightning arrester detection host is clamped to the ground wire of the zinc oxide lightning arrester through the insulating rod; Acquire a first current signal of the zinc oxide lightning arrester according to the zinc oxide lightning arrester detection host; Acquiring a reference current signal according to the reference current transformer; A single zinc oxide lightning arrester to be detected is detected according to the amplitude and angle of the first current signal and the reference current signal.

7. The zinc oxide arrester fault detection method according to claim 1, characterized in that: The plurality of current transformers include two, one is arranged in the detection host, and the other is connected to the detection host, respectively recorded as a first current transformer and a second current transformer, to realize the detection of two zinc oxide lightning arresters to be tested, specifically including: When fault detection is performed on the two zinc oxide lightning arresters, the open current transformer in the second current transformer is clamped to the ground wire of the second zinc oxide lightning arrester through the insulating rod; Acquire a second current signal according to the zinc oxide lightning arrester detection host; The amplitude and angle of the first current signal, the second current signal and the reference current signal are calculated by the main control chip in the zinc oxide lightning arrester detection host; The two zinc oxide lightning arresters are detected according to the amplitudes and angles of the first current signal, the second current signal and the reference current signal.

8. The zinc oxide arrester fault detection method according to claim 1, characterized in that: The plurality of current transformers include three, one of which is disposed in the detection host, and the other two are connected to the detection host, respectively recorded as a first current transformer, a second current transformer, and a third current transformer, to implement detection of three zinc oxide lightning arresters to be tested, specifically including: When fault detection is performed on the three zinc oxide lightning arresters, the open current transformer in the third current transformer is clamped to the ground wire of the third zinc oxide lightning arrester through the insulating rod; Acquire a third current signal according to the zinc oxide lightning arrester detection host; The main control chip in the zinc oxide lightning arrester detection host calculates the amplitude and angle of the first current signal, the second current signal, the third current signal and the reference current signal; The three zinc oxide lightning arresters are detected according to the amplitudes and angles of the first current signal, the second current signal, the third current signal and the reference current signal.

9. A zinc oxide arrester fault detection device, characterized in that: The device includes: A detection host, a reference current transformer, and several current transformers externally connected to the detection host. The detection host includes a first current transformer, a current acquisition unit, and a main control unit. The reference current transformer and several external current transformers are connected to the detection host. The current acquisition unit includes a reference current amplifying circuit, multiple current amplifying circuits, and a metering circuit. The input end of the reference current amplifying circuit is connected to the output end of the reference current transformer, and the output end of the reference current amplifying circuit is connected to the input end of the metering circuit. Multiple current amplifying circuits are connected to the first current transformer and several external current transformers of the detection host, and the outputs of the multiple current amplifying circuits are connected to the metering circuit. The main control unit is used to collect the current amplitude and angle corresponding to each current amplifying circuit, and perform detection processing.

10. The zinc oxide arrester fault detection device according to claim 9, characterized in that: The plurality of current transformers externally connected to the detection host include two, respectively denoted as a second current transformer and a third current transformer, and the plurality of current amplification circuits include three, specifically: a first current amplifying circuit, wherein an input end of the first current amplifying circuit is connected to an output end of the first current transformer, and an output end of the first current amplifying circuit is connected to an A-phase current input end of the metering circuit; a second current amplifying circuit, wherein an input end of the second current amplifying circuit is connected to an output end of the second current transformer, and an output end of the second current amplifying circuit is connected to a B-phase current input end of the metering circuit; A third current amplifying circuit, wherein the input end of the third current amplifying circuit is connected to the output end of the third current transformer, and the output end of the third current amplifying circuit is connected to the C-phase current input end of the metering circuit.

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