Impact large-current test system for 10kV lightning arrester

Abstract

According to the 10kV lightning arrester impact large current test system, the pulse capacitors are arranged in a lying mode instead of being arranged vertically and are divided into two layers, meanwhile, the pulse capacitors are connected in parallel in multiple paths, and the pulse capacitors in each path are connected through two capacitor cathodes. Wherein one positive electrode is connected with a resistor disc and then connected to the high-voltage capacitor side conductive disc, and the other positive electrode is connected to the zero potential conductive disc. The anode of the charging circuit is connected with the high-voltage capacitor side conductive disc, and the cathode is connected with the zero-potential conductive disc. The high-voltage capacitor side conductive disc and the zero potential conductive disc are connected to the two ends of the spherical discharge device respectively, and the spherical discharge device discharges up and down at the same time, so that the problems of non-uniform energy release, unstable current and easy explosion in the lightning arrester test process during the impact large current test are solved, and the accuracy and reliability of the test result are improved. According to the invention, the energy consumption during system testing can be effectively reduced.

Description

Technical Field

[0001] The invention belongs to the field of impulse overcurrent test, in particular to a 10kV lightning arrester impulse high current test system. Background Art

[0002] Lightning arresters play an important role in power systems and can effectively protect power equipment from external interference such as lightning strikes. With the continuous development of power systems and the increasing requirements for power supply reliability, higher requirements are placed on the performance and reliability of lightning arresters. The arrester impulse high current test mainly simulates the working state of the arrester under extreme conditions such as lightning strikes. As a common performance evaluation method, the impulse high current test is widely used to test the tolerance of lightning arresters under various electrical fault conditions. Past studies have shown that impulse high current tests can help determine the tolerance and discharge performance of lightning arresters, providing an important reference for their application in actual work. However, the current impulse current generator cannot achieve multiple tests on the entire arrester. When a single arrester is tested multiple times, it needs to be installed in different systems. Summary of the invention

[0003] In order to realize multiple tests of the entire lightning arrester in one impulse high current test system, the present invention provides a 10kV lightning arrester impulse high current test system. Through the present invention, not only can the impulse high current test requirements of the 10kV lightning arrester be met, but also the generation of multiple impulse current waveforms can be achieved, thus saving equipment investment and floor space, simplifying the test process and operation steps, and improving the test efficiency and work benefits.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A 10kV arrester impulse large current test system comprises a charging module, an energy storage module, a spherical discharge device and a test module, wherein the energy storage module is composed of one or more capacitor groups connected in parallel; each capacitor group has two pulse capacitors connected in a negative pole-to-negative manner, one of which is connected to a high-voltage capacitor side conductive disk via a resistor, and the other is connected to a zero-potential conductive disk; the high-voltage capacitor side conductive disk is connected to one hemisphere of the spherical discharge device, the other hemisphere of the spherical discharge device is connected to one end of an adjustable inductor, the movable end of the adjustable inductor is connected to one end of a lightning arrester to be tested, and the other end of the lightning arrester to be tested is connected to the zero-potential conductive disk; the zero-potential conductive disk is grounded;

[0006] The test module includes a residual voltage divider and a Rogowski coil; one end of the residual voltage divider is connected between the adjustable inductor and the arrester to be tested, and the other end of the residual voltage divider is connected to the zero-potential conductive disk; the Rogowski coil is arranged on the connection line between the arrester to be tested and the zero-potential conductive disk; the outputs of the residual voltage divider and the Rogowski coil are connected to an oscilloscope;

[0007] The positive pole of the charging module is connected to the conductive disk on the high-voltage capacitor side, and the negative pole of the charging module is connected to the zero-potential conductive disk.

[0008] The charging module includes a charging transformer, a charging capacitor, a voltage divider and a charging protection resistor, and the specific connection relationship is as follows: one end of the charging transformer is connected to the charging capacitor, the output of the charging capacitor is connected to the rectifier, the rectifier output is connected to the high-voltage side of the voltage divider, and the high-voltage side of the voltage divider is connected to the charging protection resistor; the charging protection resistor is connected to the conductive disk on the high-voltage capacitor side; and the low-voltage side of the voltage divider is connected to the voltage acquisition system.

[0009] The charging module is also provided with a positive and negative polarity module, and the positive and negative polarity module is arranged between the charging transformer and the conductive disk on the high-voltage capacitor side.

[0010] The adjustable inductor is formed by connecting a plurality of fixed inductors in series and parallel, and the inductance is adjusted by adjusting the inductance of the series and parallel inductors.

[0011] Each group of capacitors is fixed by a rack respectively, each rack is divided into two layers, the upper and lower layers, and the pulse capacitors are arranged flat.

[0012] A protective shell is arranged outside the tested arrester, and a movable door is arranged on the protective shell.

[0013] The adjustable inductance has an adjustment range of 1.5-500 μH.

[0014] The pulse capacitor has a capacity of 2-20 μF.

[0015] The beneficial effects obtained by the present invention are:

[0016] Traditional impulse high current test systems can often only meet the test requirements of specific types of lightning arresters, and require different types of test equipment to support multiple tests, resulting in repeated investment in equipment and waste of resources. The lightning arrester impulse high current test system of the present invention realizes the test function of one device with multiple functions, and has obvious application advantages. Through the optimized design and functional integration of the system, the test requirements for different types of lightning arresters can be met. This not only saves equipment investment and floor space, but also simplifies the test process and operating steps, and improves test efficiency and work efficiency. At the same time, the realization of the test function of one device with multiple functions also provides users with a more flexible and convenient test solution, which can meet the personalized needs of different users and improve the applicability of the system.

[0017] Another application advantage is to reduce costs and improve economic benefits in the design and optimization of the 10kV arrester impulse high current test system. Due to the uniform energy release, the current released by the arrester is more stable, and the system does not need additional energy to compensate for the impact of unevenness, thereby reducing the energy consumption of the system. While improving the test efficiency and accuracy, it effectively reduces the test cost and has obvious economic benefits.

[0018] Saving equipment investment and floor space, reducing equipment procurement and maintenance costs, is achieved through the test function of one device with multiple functions. The optimized design and functional integration of the system simplify the test process and operation steps, reduce the test costs and operating costs, and reduce human resource investment. Improving test efficiency and work efficiency, the high performance and reliability of the system create more economic value and profit for users. Cost reduction and economic benefit improvement are the important application advantages of the 10kV lightning arrester impulse high current test system to provide users with a more economical and sustainable test solution with broad market prospects and application potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the arrester impulse high current test system of the present invention.

[0020] Figure 2 The present invention is a schematic diagram of the circuit structure of the arrester impulse high current test system.

[0021] Figure 3 This is the schematic diagram of the arrester impulse high current test system before improvement.

[0022] Figure 4 It is the schematic diagram of the main discharge circuit of the impulse current device.

[0023] Figure 5 Yes ω, ω 0 The relationship diagram of δ.

[0024] Figure 6 It is a graph showing the relationship between the wavefront time of lightning current and the damping coefficient.

[0025] Figure 7 It is a graph showing the relationship between the ratio of the half-peak time of lightning current to the wavefront time and the damping coefficient.

[0026] Figure 8 It is a graph showing the relationship between the peak value of lightning current and the damping coefficient.

[0027] Fig. 9 It is a reverse polarity oscillation and ξ relationship curve.

[0028] Fig.10 This is the waveform diagram of the arrester's high current impulse system before improvement.

[0029] Fig.11 It is a waveform diagram of the arrester impulse high current test system of the present invention.

[0030] In the figure, there are resistor sheet 1, pulse capacitor 2, adjustable inductor 3, charging transformer 4, control unit 5, rectifier 6, charging resistor 7, voltage divider 8, lightning arrester 9, charging protection resistor 10, residual voltage divider 11, copper sheet 12, rectifier 13, and conductive disk 14 on the high-voltage capacitor side. DETAILED DESCRIPTION

[0031] The present invention will be described below in conjunction with the accompanying drawings.

[0032] The basic circuit of 10kV arrester impulse high current test is as follows Figure 3 As shown. The circuit composition includes a charging circuit, an energy storage module, a control module, a waveform adjustment circuit and a test circuit. Its working principle is as follows: first, the energy storage module is charged through the charging circuit. After charging is completed, the spherical discharge device is controlled by the control module to shorten the distance between the two hemispheres of the spherical discharge device. When the distance is shortened to a certain extent, discharge is formed between the two hemispheres so that a large impact current flows through the arrester. The arrester is tested using a test circuit to obtain the test results.

[0033] The main discharge circuit of the impulse current device is as follows Figure 4 shown. Figure 4 In the figure, C is an ideal capacitor, L is the total inductance of the discharge loop, including the inductance of the switch K, the inductance of the connecting line, the inductance of the load and the modulation inductance, and R is the total resistance of the discharge loop, including the resistance of the transmission line, the equivalent resistance of the discharge switch, the resistance of the load and the waveform forming resistance.

[0034] for Figure 4 , from the circuit theory:

[0035]

[0036] This is a second-order homogeneous differential equation with constant coefficients, and its characteristic equation is:

[0037] LcP 2 +RCp+1=0 (1-2)

[0038] The characteristic roots of the equation are:

[0039]

[0040] In order to take these two roots into account, the solution of equation (1-1) is:

[0041]

[0042] p1 and p2 are characteristic roots, which are only related to the circuit parameters and structure; while the integral constants A1 and A2 are determined by the initial conditions i(0+) and Now given Figure 4 The initial conditions of the circuit are:

[0043]

[0044] According to formulas (1-4) and (1-5), we can get

[0045]

[0046] Solving (1-6) simultaneously, we can obtain constants A1 and A2:

[0047]

[0048] Substituting (1-7) into (1-4) we get:

[0049]

[0050] The following three cases are discussed according to the values ​​of the characteristic roots of p1 and p2: Case 1: Underdamped

[0051] when That is, δ<ω0, the characteristic equation has conjugate complex roots P1 and P2. If we set:

[0052]

[0053] Substituting (1-9) into (1-3), we get

[0054]

[0055] According to the relationship between ω, ω0 and δ ( Figure 5 ),have

[0056] δ=ω 0 cosθ,ω=ω 0 sinθ (1-11)

[0057] according to

[0058]

[0059] Substituting (1-10) into (1-8) and using (1-12), we get the loop current:

[0060]

[0061] Substitute (1-14) into (1-13) and let ξ be the damping coefficient of the loop:

[0062]

[0063] Formula (1-13) is transformed into

[0064]

[0065] Second case: Critical Damping Case

[0066] when When ξ=1, the characteristic root of the loop equation (1-1) is

[0067]

[0068] In this case, we still use the general solution (1-8) of the discharge process, that is,

[0069]

[0070] Then, let the characteristic root p 2 →p 1 For this 0 / 0 type, we can find the limit according to the Robert-Peter rule and get the loop current as

[0071]

[0072] The moment when the current reaches its amplitude:

[0073]

[0074] Current Amplitude:

[0075]

[0076] Assume that the time for the current to drop from 0 to the maximum value Im and then to 0.5Im is T 0.5 , from (1-17) and (1-18) we get

[0077]

[0078] According to formula (1-17),

[0079]

[0080] Substituting (1-21) into (1-20) we get

[0081]

[0082] Solve (1-22) and we get: T 0.5 / T m ≈2.68

[0083] Considering the definitions of impulse current wavefront time T1 and half-peak time T2 specified in IEC and national standards, the ratio of half-peak time T2 to wavefront time T1 is calculated as: T 2 / T 1 =3.76.

[0084] It can be concluded that the linear resistance impulse current generating circuit cannot obtain standard impulse current waves such as 4 / 10μs and 8 / 20μs under critical damping conditions. 2 / T 1 =2.5. If you want to reduce T 2 / T 1 , the circuit only works in the oscillating discharge state; in the overdamped state, T 2 / T 1 >3.76, suitable for T 2 / T 1 Current waveforms with larger values, such as 1 / 20μs, 10 / 350μs impulse current waves, etc.

[0085] The third case: Overdamping

[0086] when When ξ>1, the characteristic root of equation (1-1) is

[0087]

[0088] The loop current is

[0089]

[0090] The moment when the current reaches its amplitude

[0091]

[0092] Current peak

[0093]

[0094] In general, when When When R is smaller, the current is a non-oscillating wave. The smaller the R, the greater the impact current. In the extreme case, when R = 0, the maximum impact current is when When , the maximum current is 0.368(Im)max. The larger the resistance, the smaller the maximum current value. In practical applications, the resistance cannot be zero, but it has a larger amplitude in the oscillation case. The maximum amplitude of the non-oscillation wave occurs under critical conditions, and its amplitude is only 36.8% of the maximum value of the oscillation current in the pure LC circuit.

[0095] To generate 8 / 20μs and 4 / 10μs lightning impulse current waves for arrester impulse test, the lightning current generating circuit must work in an underdamped state. At this time, the relationship between the circuit current and time is shown in formula (1-15). Assume

[0096]

[0097] In the formula, i * represents the normalized impulse current parameter, t * Represents the normalized time parameter.

[0098] Substituting (1-27) and (1-28) into (1-15), we obtain

[0099]

[0100] This results in a set of Figures 6 to 9 The relationship curve between the current waveform parameters of the loop output and the loop damping coefficient is shown.

[0101] According to IEC and national standards, Not more than 20%, by Fig. 9 The curve shows that ξ=0.455, and then from Figure 7 The corresponding curve It is 2.72, which is within the allowable range of the 8 / 20μs standard waveform.

[0102] When ξ=0.455, the normalized time parameter T 1 * =0.925, normalized current peak parameter At the same time, according to the lightning impulse current generator loop impedance of 4-6Ω, and the current peak i m For the 10kA test requirement, according to the following formula

[0103]

[0104] Will T 1 * ,ξ,T 1 andi m Substituting in, the parameters of the lightning generation circuit can be obtained as:

[0105]

[0106] Meet the requirements of 10kV whole arrester lightning impulse current test (inductance is adjustable between 1.5-500μH).

[0107] Design of 4 / 10μs, 65kA high current impulse generator circuit

[0108] For 4 / 10μs impulse current wave, according to IEC and national standards, the range of T2 / T1 is 2.05~3.06. Figure 6 Known standard 4 / 10μs The corresponding ξ should be 0.35, but according to IEC and national standards, the impulse current Should be less than 20% from Fig. 9 The curve shows that ξ is 0.47, and then from Figure 6 The corresponding curve is 2.72, which meets the waveform parameter requirements. According to the following formula, the loop parameters can be solved

[0109]

[0110] When ξ=0.47, Figure 6 and Figure 8 T 1 * =0.92 and At a known impulse current peak value i m Under the conditions of and wavefront time T1, there are four unknowns in the equation, so there are infinite solutions to the equation. Assume that the capacitor capacity C is known, and based on the lightning impulse current generator loop impedance of 4-6Ω and the current peak value i m For the test requirements of 65kA, according to the following formula

[0111]

[0112] Based on the above theoretical calculations, the impedance of the entire 10kV lightning arrester is greater than the impedance of the lightning arrester valve plate. According to the corresponding theoretical calculation requirements, the impedance of the test sample is different and the experimental equipment configuration is different, so equipment optimization and improvement are carried out.

[0113] Realization of overdamped state

[0114] The overdamped state refers to the state in which the vibration system, when subjected to external excitation, has a damping force large enough that the vibration cannot be sustained or decays rapidly. In the lightning impulse current test, to achieve the overdamped state, the following methods are required:

[0115] Add damping elements: By adding damping elements such as resistors and inductors, the damping force of the system can be increased, making it easier for the system to enter an over-damped state. These damping elements can be connected in series or in parallel in the test circuit, and the specific configuration needs to be determined according to the test requirements and system characteristics.

[0116] Adjust circuit parameters: By adjusting the resistance, inductance, capacitance and other parameters of the test circuit, the damping ratio of the system can be changed to achieve an over-damped state. This requires precise calculation and analysis of the circuit to ensure that the system can work stably in the required damping state.

[0117] In the over-damped state, the system can more effectively absorb and transform the energy of the impulse current, thereby reducing damage to the test equipment and test products and improving the accuracy and reliability of the test.

[0118] Realization of underdamped state

[0119] The underdamped state refers to the state where the system damping force is small and cannot completely prevent the vibration from exceeding the equilibrium position. In the lightning impulse current test, to achieve the underdamped state, the following methods are required:

[0120] Reduce damping elements: By reducing the resistance or inductance of damping elements such as resistors and inductors, the damping force of the system can be reduced, making the system more likely to enter an underdamped state. Similarly, the configuration of these damping elements needs to be determined based on test requirements and system characteristics.

[0121] Adjust the excitation signal: By adjusting the frequency, amplitude and other parameters of the excitation signal, the response characteristics of the system can be affected, thereby achieving an underdamped state. This requires precise control and adjustment of the excitation signal to ensure that the system can respond according to the expected damping state.

[0122] In the underdamped state, the system can produce more obvious oscillation phenomenon, which is helpful to observe and analyze the characteristics of the impulse current and improve the sensitivity and accuracy of the test.

[0123] In order to comprehensively consider the stability, safety and test requirements of the system, the over-damped and under-damped states will be adjusted. At the same time, the test equipment and test products are fully protected and measures are taken to ensure the accuracy of the test results.

[0124] However, even if the test is performed in the existing arrester impulse current test system according to the results of theoretical calculations, the waveform does not meet the standard test waveform and the test results are not ideal. Compared with a separate waveform test system, the arrester under test is more likely to explode during the test, resulting in inaccurate test results.

[0125] In order to realize the requirement that a set of test system can complete multiple impulse current tests of the entire lightning arrester, the present invention improves the circuit structure.

[0126] The composition and connection relationship of the arrester impulse large current test system of the present invention are as follows: Figure 1 As shown, the circuit structure diagram is as follows Figure 2As shown. The charging circuit consists of a charging transformer 4, a rectifier 6, a charging capacitor 7 and a charging protection resistor 10. The charging transformer 4 is connected to an external power supply, one end of the charging capacitor 7 is connected to the charging transformer 4, and the other end of the charging capacitor 7 is connected to one end of the rectifier 6. The rectifier 6 converts AC power into DC power. The other end of the rectifier 6 is connected to the voltage divider 8. The other end of the voltage divider 8 is connected back to the charging transformer 4. The output end of the voltage divider 8 is connected to the charging protection resistor 10. The charging protection resistor 10 is composed of two resistors in parallel. The charging protection resistor 10 is connected to the conductive disk 14 on the high-voltage capacitor side. The conductive disk 14 on the high-voltage capacitor side is connected to the resistor sheet 1, and the resistor sheet 1 is connected to the energy storage module.

[0127] The energy storage module is composed of multiple capacitor groups connected in parallel, each capacitor group has two pulse capacitors connected with negative poles, one of which is connected to the high-voltage capacitor side conductive disk through a resistor, and the other is connected to the zero-potential conductive disk; the high-voltage capacitor side conductive disk is connected to one hemisphere of the spherical discharge device, the other hemisphere of the spherical discharge device is connected to one end of the adjustable inductor, the active end of the adjustable inductor is connected to one end of the lightning arrester to be tested, and the other end of the lightning arrester to be tested is connected to the zero-potential conductive disk.

[0128] In this embodiment, the energy storage module is connected in a three-in-two series manner, that is, the capacitor group is divided into three groups in a basic form of parallel connection, and each capacitor group consists of two pulse capacitors 2 connected in series. The two pulse capacitors 2 of each capacitor group are connected in a negative-to-negative manner, one of which is connected to one end of the resistor 1, and the other is connected to the zero-potential conductive disk. The other end of the resistor 1 is connected to the high-voltage capacitor side conductive disk, and the high-voltage capacitor side conductive disk is connected to one of the hemispheres of the spherical discharge device. One end of the adjustable inductor 3 is connected to the other hemisphere of the spherical discharge device, and the other end is connected to one end of the arrester to be tested, and the other end of the arrester to be tested is connected to the zero-potential conductive disk.

[0129] This special design of the energy storage module has changed the traditional 10kV lightning arrester impulse current generator setting method of using multiple capacitors directly in parallel. It can not only meet the test of the entire lightning arrester, but also adjust the inductance through the spherical discharge device to meet different waveform requirements. Compared with the traditional setting method, the lightning arrester can release current more evenly and stably during the impulse current test, which has obvious technical advantages.

[0130] Furthermore, the pulse capacitor 2 is supported by racks, each set of racks is divided into upper and lower layers, and the pulse capacitor 2 is placed flat instead of vertically, which can reduce the space occupied by the pulse capacitor 2.

[0131] A protective shell is set outside the lightning arrester under test to prevent fragments from flying everywhere when the lightning arrester explodes.

[0132] In order to illustrate the effect after the transformation, 7 100kV / 3uF pulse capacitors were used in parallel before the transformation: rated voltage: ±100kV; rated capacity: 21uF; rated energy: 100kJ.

[0133] After the transformation, 6 100kV / 3uF pulse capacitors are used in series and parallel, with a rated voltage of 200kV, a layer voltage of 100kV, two layers of the main body, and a three-group parallel structure. Rated capacity: single layer capacitor 3uf / 100kV, 1 unit per layer, two layers of capacitance 1.5uf, and a total capacitance of three parallel groups of 4.5uf; rated energy: 90kJ.

[0134] Test data comparison

[0135] Before the transformation: the test data was inaccurate, the waveform was abnormal, and the test sample was prone to explosion. The apparent wavefront time T1 and the apparent half-peak time T2 were difficult to achieve the values ​​specified in the standard, the current peak value could not meet the test requirements, and the discharge residual voltage was too large. At the same time, the data acquisition of acquisition channels CH1 and CH2 was also extremely unstable, and the equipment as a whole showed abnormal phenomena of low voltage and high energy. Fig.10 shown.

[0136] After the transformation: the test data is stable and accurate, the waveform is correct, and the test product does not explode. The apparent wavefront time T1 and the apparent half-peak time T2 can achieve the standard specified values ​​through the adjustment of the inductor and resistor, and the current peak reaches the required current peak. The discharge residual voltage meets the specified value. The acquisition channels CH1 and CH2 are accurate and stable. Fig.11 shown.

[0137] Use effect comparison

[0138] Before the transformation: The inductance and resistance adjustment were limited, the positive and negative polarity adjustment was unreliable, the residual voltage divider measurement space was narrow, and it was inconvenient to change the test sample placement. The test waveform was unstable, the acquisition channels CH1 and CH2 were extremely unstable, and the test sample was prone to explosion.

[0139] After the transformation: the whole 10kV lightning arrester can be tested for high current impact. The voltage, capacity and energy of the test equipment fully meet the requirements of the test equipment. The convenient and adjustable resistance and inductance conversion joints are added to expand the space for placing the test products. The test waveform is stable, the data is accurate, and the test products are not prone to explosion. At the same time, it can also meet the large current impact test of the lightning arrester valve plate and meet the test of different types of lightning arresters.

[0140] After comprehensive comparison, the present invention reduces the space occupied by the arrester impulse large current test system, and a set of systems can realize multiple waveform tests by changing the values ​​of resistors, capacitors, and inductors, and the test waveforms are correct, and explosions are not likely to occur during the test. The rated energy used in the test is reduced.

[0141] When using the arrester impulse high current test system of the present invention for testing, it is necessary to first clarify the impulse current waveform and target parameter value to be tested, select the capacity of the pulse capacitor, the resistance value of the resistor and the inductance value of the inductor according to the needs, and connect them to the circuit after adjustment to conduct the test. The values ​​of the capacitor, inductor, and resistor corresponding to the specific waveform requirements can be referred to Table 1. The parameter control of the inductance is adjusted by the adjustable inductor, the resistance value can be achieved by replacing the appropriate resistor, and the capacitance can be achieved by the parallel and series combination of the pulse capacitor. When a larger capacitance value is required, by changing the pulse capacitor from a vertical placement to a flat placement and dividing it into an upper and lower layer setting, the occupied space of the pulse capacitor can be greatly reduced, making the system space more tidy.

[0142] Table 1 Corresponding parameter values ​​when the system of the present invention performs various waveform tests

[0143]

Claims

1. A 10kV lightning arrester impulse high current test system, comprising a charging module, an energy storage module, a spherical discharge device and a test module, characterized in that: The energy storage module is composed of one or more capacitor groups connected in parallel with each other; each capacitor group has two pulse capacitors connected with negative electrodes, one of which is connected to the high-voltage capacitor side conductive disk through a resistor, and the other is connected to the zero-potential conductive disk; the high-voltage capacitor side conductive disk is connected to one hemisphere of the spherical discharge device, the other hemisphere of the spherical discharge device is connected to one end of the adjustable inductor, the movable end of the adjustable inductor is connected to one end of the arrester to be tested, and the other end of the arrester to be tested is connected to the zero-potential conductive disk; Zero potential conductive disk grounding; The test module includes a residual voltage divider and a Rogowski coil; One end of the residual voltage divider is connected between the adjustable inductor and the arrester to be tested, and the other end of the residual voltage divider is connected to the zero-potential conductive disk; the Rogowski coil is arranged on the connection line between the arrester to be tested and the zero-potential conductive disk; the outputs of the residual voltage divider and the Rogowski coil are connected to the oscilloscope; The positive pole of the charging module is connected to the conductive disk on the high-voltage capacitor side, and the negative pole of the charging module is connected to the zero-potential conductive disk.

2. The 10kV arrester impulse high current test system according to claim 1 is characterized in that: The charging module includes a charging transformer, a charging capacitor, a voltage divider and a charging protection resistor, and the specific connection relationship is as follows: one end of the charging transformer is connected to the charging capacitor, the output of the charging capacitor is connected to the rectifier, the rectifier output is connected to the high-voltage side of the voltage divider, and the high-voltage side of the voltage divider is connected to the charging protection resistor; the charging protection resistor is connected to the conductive disk on the high-voltage capacitor side; and the low-voltage side of the voltage divider is connected to the voltage acquisition system.

3. The 10kV arrester impulse high current test system according to claim 2 is characterized in that: The charging module is also provided with a positive and negative polarity module, and the positive and negative polarity module is arranged between the charging transformer and the conductive disk on the high-voltage capacitor side.

4. The 10kV arrester impulse high current test system according to claim 1 is characterized in that: The adjustable inductor is formed by connecting a plurality of fixed inductors in series and parallel, and the inductance is adjusted by adjusting the inductance of the series and parallel inductors.

5. The 10kV arrester impulse high current test system according to claim 1 is characterized in that: Each group of capacitors is fixed by a rack respectively, each rack is divided into two layers, the upper and lower layers, and the pulse capacitors are arranged flat.

6. The 10kV arrester impulse high current test system according to claim 1 is characterized in that: A protective shell is arranged outside the tested arrester, and a movable door is arranged on the protective shell.

7. The 10kV arrester impulse high current test system according to claim 1 is characterized in that: The adjustable inductance has an adjustment range of 1.5-500 μH.

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