Periodic energy injection test device and method for lightning arrester performance test

Abstract

The invention provides a periodic energy injection test device and method for lightning arrester performance test. The periodic energy injection test device comprises a tested lightning arrester unit and a multi-time energy injection structure, the multi-time energy injection structure comprises a power supply, a plurality of groups of capacitors, a plurality of switches, a plurality of thyristor valves and an inductor, wherein each group of capacitors respectively corresponds to one switch and one thyristor valve; the thyristor valve is periodically opened, each group of capacitors discharge to the inductor and the tested lightning arrester unit, resonance current generated by the capacitors and the inductor is injected into the tested lightning arrester unit after the action voltage of the tested lightning arrester unit is reached, and the performance of the tested lightning arrester unit is analyzed based on the state of the tested lightning arrester unit after receiving the resonance current; the endurance capability of the lightning arrester under different injection energy and action times can be simulated by adjusting capacitance and inductance parameters and charging voltage; the thyristor valve is periodically opened, so that the capacitor and the inductor generate a resonance current source to perform multi-cycle energy injection on the lightning arrester, and the continuous energy absorption level of the lightning arrester is assessed.

Description

Technical Field

[0001] The present invention relates to the technical field of arrester performance testing, and specifically to a periodic energy injection test device and method for arrester performance testing. Background Art

[0002] With the wide application of UHV DC transmission technology, it is crucial for the converter valve, as the core equipment of this technology, to operate reliably for a long time. A parallel arrester is adopted at both ends of the series semiconductor devices of the converter valve to protect the semiconductor devices from breakdown due to overvoltage faults. If the arrester fails as a whole and is short-circuited during operation, the semiconductor components in parallel with it will be short-circuited, resulting in system shutdown. Generally, multiple arrester discs are connected in series and then in parallel. If a disc in one of the series columns undergoes flashover short-circuit, the leakage current operating voltage of this series column will decrease, causing more than 90% of the leakage current to flow through this series column. At this time, a single series column bears the heat of other columns in parallel with it, and its power increases exponentially, far greater than the rated design power, leading to a high-energy explosion. That is, the current method of solving the arrester failure problem by connecting multiple columns of discs in parallel in engineering cannot completely eliminate the hidden danger of arrester failure.

[0003] Therefore, for the assessment of the energy test and protection performance of large-capacity arresters, it is a key test item to effectively verify the reliable protection of multi-cycle energy injection of arresters. This test not only needs to verify the continuous energy absorption capacity of the arrester under actual working conditions, but also assess whether the arrester can reliably protect against explosion risks when a fault occurs in the internal discs.

[0004] The existing technical solutions usually adopt the method of single injection of square-wave energy to assess the energy absorption level of arresters, which is not suitable for assessing the continuous energy absorption level of large-capacity arresters used in existing DC equipment. Summary of the Invention

[0005] To overcome the above-mentioned deficiencies of the prior art, the present invention provides a periodic energy injection test device for arrester performance testing, including: a test arrester unit and a multi-energy injection structure;

[0006] The multi-energy injection structure includes: a power supply, multiple groups of capacitors, multiple switches, multiple thyristor valves, and an inductor. Each group of capacitors corresponds to one switch and one thyristor valve respectively; the power supply is connected to the corresponding capacitor through each switch to form a charging circuit for each group of capacitors; each group of capacitors is connected in series with the inductor and the test arrester unit through the corresponding thyristor valve to form multiple groups of resonant current injection circuits for the test arrester unit;

[0007] Close multiple of the switches, and charge each group of the capacitors by using the power supply; by periodically turning on each thyristor valve, discharge each charged group of the capacitors to the inductor and the test arrester unit. After the test arrester unit reaches the operating voltage, a resonant current is generated by the capacitor and the inductor and injected into the test arrester unit. Based on the state of the test arrester unit after receiving the resonant current, analyze the performance of the test arrester unit.

[0008] Optionally, the test arrester unit is a qualified arrester unit or an arrester unit containing defective varistors.

[0009] Optionally, the device further includes a control unit respectively connected to each of the switches and each of the thyristor valves;

[0010] The control unit controls the charging of each capacitor corresponding to each switch by controlling the on / off of each switch through periodically sending control timings to each switch and each thyristor valve, and controls the periodic turning on of each thyristor valve.

[0011] Optionally, the device further includes: a current-limiting arrester unit connected in series between the inductor and the test arrester unit;

[0012] The current-limiting arrester unit is used to prevent an excessive resonant current from being generated when multiple groups of the capacitors discharge to the inductor after the test arrester unit is short-circuited.

[0013] Optionally, the current-limiting arrester unit includes a plurality of parallel varistors, and the number of the varistors is determined based on the energy absorption requirement of the current-limiting arrester unit.

[0014] Optionally, a bypass switch is connected in parallel at both ends of the test arrester unit, which is used to prevent explosion due to excessive energy when the test arrester unit is short-circuited.

[0015] Optionally, the power supply is a high-voltage DC charging power supply.

[0016] Based on the above inventive concept, the present invention provides a periodic energy injection test method for arrester performance testing, including:

[0017] Based on a preset control timing, control the closing of the switch between the power supply and multiple groups of capacitors, and charge multiple groups of the capacitors to a preset time by using the power supply to obtain multiple charged groups of the capacitors;

[0018] Based on the control timing, each thyristor valve is periodically turned on, so that each group of the charged capacitors discharges to the inductor and the test arrester unit. After the test arrester unit reaches the operating voltage, a resonant current is generated by the capacitors and the inductor and injected into the test arrester unit.

[0019] Based on the state of the test arrester unit after receiving the resonant current, the performance of the test arrester unit is analyzed.

[0020] Optionally, the step of based on the control timing, each thyristor valve is periodically turned on, so that each group of the charged capacitors discharges to the inductor and the test arrester unit. After the test arrester unit reaches the operating voltage, a resonant current is generated by the capacitors and the inductor and injected into the test arrester unit includes:

[0021] Based on the control timing, the first thyristor valve is turned on, so that the capacitor corresponding to the first thyristor valve discharges to the inductor and the test arrester unit. After the test arrester unit reaches the operating voltage, a resonant current is generated by the capacitors and the inductor and injected into the test arrester unit.

[0022] Based on the control timing, the second thyristor valve is turned on, so that the capacitor corresponding to the second thyristor valve discharges to the inductor and the test arrester unit. After the test arrester unit reaches the operating voltage, a resonant current is generated by the capacitors and the inductor and injected into the test arrester unit.

[0023] Based on the control timing, the third thyristor valve is turned on, and so on until the number of thyristor valves to be turned on required for the test is reached.

[0024] Optionally, after generating a resonant current by the capacitors and the inductor and injecting the resonant current into the test arrester unit, the method further includes:

[0025] Closing the switch in the discharge circuit of each group of the capacitors to discharge each group of the capacitors.

[0026] Grounding each group of the discharged capacitors.

[0027] On the other hand, the present application further provides an electronic device, including: at least one processor and a memory; the memory and the processor are connected by a bus;

[0028] The memory is configured to store one or more programs.

[0029] When the one or more programs are executed by the at least one processor, the periodic energy injection test method for arrester performance testing as described above is implemented.

[0030] In another aspect, the present application also provides a computer-readable storage medium with an executable program stored thereon. When the executable program is executed, it implements the periodic energy injection test method for arrester performance testing as described above.

[0031] Compared with the closest prior art, the beneficial effects of the present invention are as follows:

[0032] The periodic energy injection test device and method for arrester performance testing provided by the present invention include: a test arrester unit and a multi-time energy injection structure; the multi-time energy injection structure includes: a power supply, multiple groups of capacitors, multiple switches, multiple thyristor valves, and an inductor. Each group of capacitors corresponds to one of the switches and one of the thyristor valves; the power supply is connected to the corresponding capacitor through each switch to form a charging circuit for each group of capacitors; each group of capacitors is sequentially connected in series with the inductor and the test arrester unit through the corresponding thyristor valve to form multiple groups of resonant current injection circuits for the test arrester unit; closing multiple switches, using the power supply to charge each group of capacitors; by periodically turning on each thyristor valve, enabling the charged capacitors in each group to discharge to the inductor and the test arrester unit. After the test arrester unit reaches the operating voltage, the capacitors and the inductor generate a resonant current and inject it into the test arrester unit. Based on the state of the test arrester unit after receiving the resonant current, the performance of the test arrester unit is analyzed; in the present invention, by periodically turning on the thyristor valves, a resonant current source composed of capacitors and inductors injects energy into the test arrester unit for multiple cycles, enabling the assessment of the continuous energy absorption level of the test arrester unit; by adjusting the capacitance quantity and parameters, inductor parameters, and charging voltage, the tolerance ability of the test arrester unit under different injection energies and energy injection action times can be simulated;

[0033] The test arrester unit connected in the present invention is a qualified arrester unit or an arrester unit containing defective varistors. When a qualified arrester is connected, injecting energy can verify the continuous energy absorption level of the arrester; connecting an arrester unit containing defective varistors can be used to verify the explosion-proof characteristics when a fault occurs in the varistors inside the arrester. Description of the Drawings

[0034] Figure 1 It is a schematic structural diagram of the periodic energy injection test device for arrester performance testing provided by the present invention;

[0035] Figure 2 It is a circuit structure diagram of a test arrester unit provided by the present invention;

[0036] Figure 3 It is a schematic structural diagram of a test arrester unit provided by the present invention;

[0037] Figure 4 Schematic flow chart of the periodic energy injection test method for arrester performance testing provided by the present invention;

[0038] Figure 5 Control timing diagram of the periodic energy injection test for the arrester unit under test provided by the present invention;

[0039] Figure 6 Typical voltage and current waveform diagram of energy absorption of the arrester unit under test provided by the present invention;

[0040] Figure 7 Schematic structural diagram of an electronic device provided by the present invention. Detailed implementation manners

[0041] In addition to the above-mentioned problems, the existing energy injection test cannot verify the explosion-proof characteristics when a fault occurs inside the arrester. To solve the above problems, the present invention provides a periodic energy injection test device and method for arrester performance testing.

[0042] The following further elaborates on the detailed implementation manners of the present invention with reference to the accompanying drawings.

[0043] Embodiment 1

[0044] The periodic energy injection test device for arrester performance testing provided by the present invention, as Figure 1 shown (which can also be referred to as the equivalent test circuit structure for periodic energy injection test), includes: an arrester unit under test (i.e., Figure 1 the test sample in) and a multi - energy injection structure;

[0045] The multi - energy injection structure includes: a power supply, multiple groups of capacitors, multiple switches, multiple thyristor valves, and an inductor. Each group of the capacitors corresponds to one of the switches and thyristor valves; the power supply is connected to the corresponding capacitor through each switch to form a charging circuit for each group of the capacitors; each group of the capacitors is connected in series with the inductor and the arrester unit under test through the corresponding thyristor valve to form multiple groups of resonant current injection circuits for the arrester unit under test;

[0046] Close multiple switches, charge multiple groups of capacitors using the power supply; by periodically turning on each thyristor valve, discharge the charged capacitors of each group to the inductor and the arrester unit under test. After the arrester unit under test reaches the operating voltage, the capacitors and the inductor generate resonant current and inject it into the arrester unit under test. Based on the state of the arrester unit under test after receiving the resonant current, analyze the performance of the arrester unit under test.

[0047] Specifically, in this embodiment, the power supply in the multiple energy injection structure is a high-voltage DC charging power supply, which is used to realize the equivalent test simulation of high-voltage large-capacity lightning arresters used in high-voltage DC equipment. The high-voltage DC charging power supply charges multiple groups of capacitors (C1, C2,..., C n , n≥1), and after the charging voltage reaches the target required value (U C > the operating voltage U1mA of the lightning arrester), the switch Kn in series with each group of capacitors is disconnected to isolate the impact on the high-voltage DC charging power supply during energy injection; the thyristor valve B n is turned on in groups, so that the charged capacitors discharge to the inductor and the test lightning arrester unit. When the test lightning arrester unit (reaches the operating voltage) operates, the capacitors and the inductor generate a resonant current and inject it into the test lightning arrester unit, that is, a part of the energy stored in the charged capacitors is injected into the test sample. By periodically turning on the thyristor valve in groups, multi-cycle energy injection is achieved.

[0048] Among them, the test lightning arrester unit is a qualified lightning arrester unit or a lightning arrester unit containing defective varistors. Based on the state of the qualified lightning arrester unit after receiving the resonant current, the continuous energy absorption level of the qualified lightning arrester unit is analyzed and verified; based on the state of the lightning arrester unit containing defective varistors after receiving the resonant current, the fault flashover characteristics, cavity air pressure characteristics, and explosion-proof performance of the lightning arrester unit are analyzed and verified.

[0049] In this embodiment, the most basic multi-column parallel lightning arrester unit is used as the test object. Specifically, the test lightning arrester unit (test sample) is composed of x varistors connected in series (x≥2) to form 1 column, and then y columns are connected in parallel (y≥2); as Figure 1 shown, a bypass switch Kp is connected in parallel at both ends of each test lightning arrester unit MOV2, and its circuit schematic diagram is as Figure 2 shown. When there is an arc pull in the test lightning arrester unit due to varistor defects, the arc energy will trigger the bypass switch to close and short-circuit the lightning arrester unit of this unit, preventing the explosion risk caused by the over-limit energy of the lightning arrester, and is used to verify whether the lightning arrester unit containing defective varistors can reliably prevent the explosion risk.

[0050] Among them, the structure of the test lightning arrester unit is as Figure 3 shown (the example is a test lightning arrester unit with 3 varistors in series and 5 columns in parallel). The epoxy sleeve is glued together with flange 1 and flange 2 to form a cavity. 5 columns of lightning arrester varistors are stacked in the cavity. For each column of varistors, from bottom to top, there are 3 varistors, a disc spring guide, and a disc spring. Finally, the rear cover end plate is pressed on the disc spring and then fixed to flange 1 through bolts.

[0051] As Figure 1As shown in the figure, the test device (equivalent test circuit) provided by the present invention can be divided into three parts according to functional partitions. In addition to the above-mentioned (1) test sample and (2) multiple energy injection structures, it also includes (3) a current-limiting arrester unit MOV1.

[0052] The current-limiting arrester unit is connected in series between the inductor and the arrester unit under test, and is used to limit the fault current when a flashover fault occurs in the arrester unit under test, prevent the reverse voltage of the capacitor from being too high and affecting the thyristor valve, and prevent the over-limited resonant current generated by the discharge of multiple groups of capacitors to the inductor after the arrester unit under test is short-circuited.

[0053] Among them, in order to reduce the charging voltage of the capacitor, the current-limiting arrester adopts a method of z varistors connected in parallel without series connection, that is, the current-limiting arrester unit includes multiple parallel varistors, and the number of varistors is determined based on the energy absorption requirement of the current-limiting arrester unit.

[0054] The test device also includes a control unit respectively connected to each switch and each thyristor valve;

[0055] The control unit controls the on-off of each switch to charge the capacitor corresponding to each switch by periodically sending control timings to each switch and each thyristor valve, and controls the periodic turn-on of each thyristor valve, so as to transfer the energy (current) of multiple groups of capacitors to the arrester unit under test and complete the verification of the energy absorption characteristics of the arrester unit under test.

[0056] In this test device, the tolerance ability of the arrester under different matching currents and injected energies can be simulated by adjusting the capacitor parameters, inductor parameters and charging voltage. Specifically, the test current output by each group of capacitors is a sine half-wave current, which is used to equivalently simulate the energy absorbed by the actual arrester. The half-wave duration is set to Δt (Δt≥1ms). By adjusting the capacitance value and charging voltage U of the capacitor C and the inductor are used to simulate current waveforms with different amplitudes, and the values of the capacitor and the inductor are calculated according to the following formula:

[0057]

[0058] Among them, C n represents the capacitance value of the nth capacitor; I m represents the peak current borne by the arrester unit under test when the test device fails; Δt represents the half-wave duration of the current output by the capacitor; U C represents the charging voltage of the capacitor, and the charging voltage needs to be greater than the sum of the operating voltages of the arrester unit under test and the current-limiting arrester; L represents the inductor parameter.

[0059] Such as Figure 1As shown, in addition to multiple sets of LC resonant current sources (one set of resonant current sources includes a pair of capacitors and inductors connected in series) for injecting energy into the arrester unit under test in this test device, a capacitor discharge device is also included. The capacitor discharge device includes discharge circuits for multiple sets of capacitors. Each discharge circuit for a set of capacitors includes a capacitor, a switch Km, and a discharge resistor Rd connected in series in sequence.

[0060] The capacitor discharge device is used to discharge after the capacitors complete periodic energy injection. Specifically, after multiple sets of the capacitors complete periodic energy injection, the switches in the discharge circuits of each set of the capacitors are closed to discharge each set of the capacitors, and the discharged capacitors are grounded.

[0061] The test device provided in this application can be used for the equivalent test of the protection performance of arrester proportional unit components, solves the problem of equivalent verification of the explosion-proof design of multi-column parallel arresters, and realizes the test simulation of the multi-cycle energy injection process of arresters. In this embodiment, it is mainly used for the periodic energy input test of high-voltage large-capacity arrester units. The multi-stage capacitor bank is charged by a high-voltage DC power supply, and the capacitor bank is periodically turned on by a thyristor valve to discharge to the inductor and the series test sample. After the arrester unit under test operates, a part of the energy of the capacitor bank is discharged to the arrester unit under test. To prevent a large resonant current from being generated when the capacitor bank directly discharges to the inductor after the test sample is short-circuited, a current-limiting arrester unit is connected in series in the test circuit. By adjusting the capacitor parameters, inductor parameters, and charging voltage, the tolerance ability (i.e., the energy absorption level) of the arrester under different matching currents and injected energies can be simulated, and the continuous multi-cycle operation and energy absorption of the arrester unit under test can also be simulated; at the same time, through the arrester unit with defective varistors and the bypass switch connected in parallel with it, it is verified that the internal fault flashover energy of the arrester provides key test indicators for the explosion-proof and reliable protection design of the arrester, as well as the gas characteristics in the cavity when the varistors inside the arrester fail and flash over, providing a design basis for the protection action of the arrester bypass switch. The test device can meet the test requirements for different action times, currents, and energy absorption times.

[0062] In the present invention, multiple sets of LC resonant current sources and capacitor discharge devices are built, which can realize the assessment of the energy absorption level of the arrester under test under different currents, durations, and injection action times; at the same time, through the control unit, independent or combined control of the resonant current sources and thyristor valves can be realized.

[0063] At the same time, in this test device, by adjusting the inductor parameters, the verification of the protection action response time of the bypass switch during internal faults of the arrester under different half-wave current durations Δt (i.e., the current half-wave duration) of the arrester can be simulated to meet the reliable protection of the arrester under actual working conditions;

[0064] The current-limiting arrester unit can effectively prevent the thyristor valve from being damaged by the high reverse overvoltage generated on the thyristor valve after the capacitor voltage undergoes polarity reversal.

[0065] An energy test control platform (i.e., the control unit) is established, and the control parameters (such as the number of energy absorption times, current, charging voltage, etc.) can be dynamically adjusted according to the actual working conditions to effectively verify different action times of the arrester unit under test.

[0066] Embodiment 2

[0067] Based on the above test device, the present invention also provides a periodic energy injection test method for testing the performance of the arrester, as Figure 4 shown, including:

[0068] S1. Based on a preset control timing, control the switch between the power supply and multiple groups of capacitors to close, and use the power supply to charge multiple groups of the capacitors for a preset time to obtain the charged multiple groups of capacitors.

[0069] S2. Based on the control timing, periodically turn on each thyristor valve, so that each charged group of capacitors discharges to the inductor and the arrester unit under test. When the arrester unit under test reaches the operating voltage, use the capacitors and the inductor to generate a resonant current and inject it into the arrester unit under test.

[0070] S3. Analyze the performance of the arrester unit under test based on the state of the arrester unit under test after receiving the resonant current.

[0071] In this embodiment, the specific control timing of the periodic energy injection test is as Figure 5 shown. The initial state of the test (i.e., before step S1) is that the switch Kn is closed and the thyristor valve V n is blocked;

[0072] In step S1, after a time dT1 in the control timing, control the switch Kn between the power supply and multiple groups of capacitors to close, and use the power supply to charge multiple groups of the capacitors C1, C2,..., C n After charging for a time dT2, the capacitors are charged to the required value U of the charging voltage C and then the switch Kn is opened to obtain the charged multiple groups of capacitors.

[0073] In step S2, after a time dT3, turn on the first thyristor valve V1, so that the charged capacitor C1 corresponding to the first thyristor valve V1 discharges to the inductor and the arrester unit under test. When the capacitor voltage reaches the operating voltage of the arrester unit under test (i.e., the arrester unit under test reaches the operating voltage), use the capacitor C1 and the inductor to generate a resonant current and inject it into the arrester unit under test.

[0074] Turn on the second thyristor valve V2 after controlling the timing sequence (selecting a 20 ms cycle in this embodiment), so that the charged capacitor C2 corresponding to the second thyristor valve V2 discharges to the inductor and the test arrester unit. When the test arrester unit reaches the operating voltage, a resonant current is generated by the capacitor C2 and the inductor and injected into the test arrester unit.

[0075] Based on the control timing sequence, turn on the third thyristor valve V3, and so on, until the number of thyristor valves to be turned on meets the test requirements, enabling the injection of multi-cycle energy. dT4 is the conduction interval of the thyristor valve (dT4 ≥ 1 ms).

[0076] In step S3, if the test arrester unit connected in the test device is a qualified arrester unit, analyze and verify the energy absorption level of the qualified arrester unit based on the state of the qualified arrester unit after receiving the resonant current.

[0077] If the test arrester unit connected in the test device is an arrester unit with defective discs, analyze and verify the fault flashover characteristics, cavity air pressure characteristics, and explosion-proof performance of the arrester unit based on the state of the arrester unit with defective discs after receiving the resonant current.

[0078] After the test is completed, that is, after the resonant current is injected into the test arrester unit, it further includes:

[0079] Close the switches in the discharge circuits of each group of capacitors to discharge each group of capacitors.

[0080] Ground each group of discharged capacitors and hang up the grounding rod.

[0081] Typical voltages and currents of the test arrester unit formed during the above test process are as Figure 6 shown, where the horizontal axis represents time t, Δt represents the half-wave duration of the capacitor output current, the lower half of the vertical axis is the current I of the test arrester unit, and I m represents the peak value of the half-wave current, that is, the peak current borne by the arrester during system faults; the upper half of the vertical axis is the voltage U of the test arrester unit, and U MOV represents the residual voltage corresponding to when the current of the test arrester unit is I m .

[0082] Embodiment 3

[0083] As Figure 7As shown in the figure, the present invention also provides an electronic device, which may be a computer device, a single-chip microcomputer device, a smart mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, the processor, and the transceiver component are connected through a bus; the memory can be used to store an execution program, and an exemplary execution program may include instructions; the processor is used to execute the instructions stored in the memory. The memory can also be used to store data, and this data can be called and / or modified when the instructions are executed.

[0084] The processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of the periodic energy injection test method for arrester performance testing in the above embodiments.

[0085] Embodiment 4

[0086] Based on the same inventive concept, the present invention also provides a readable storage medium, specifically an electronic device-readable storage medium (Memory). The electronic device-readable storage medium is a memory device in the electronic device, and is used to store programs and data. It can be understood that the storage medium here can include both the built-in storage medium in the electronic device, and of course can also include the extended storage medium supported by the electronic device. The storage medium provides a storage space, and this storage space stores the operating system of the terminal. And, one or more instructions suitable for being loaded and executed by the processor are also stored in this storage space. These instructions can be one or more execution programs (including program codes). It should be noted that the storage medium here can be a high-speed RAM memory, or a non-volatile memory, such as at least one disk memory. By the processor loading and executing one or more instructions stored in the storage medium, the steps of the periodic energy injection test method for arrester performance testing in the above embodiments can be implemented.

[0087] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0088] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices produce means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0089] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing devices to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufactured article including instruction means that implement the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0090] These computer program instructions can also be loaded onto a computer or other programmable data processing devices, such that a series of operation steps are executed on the computer or other programmable devices to produce a computer-implemented process, and thus the instructions executed on the computer or other programmable devices provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the scope of its protection. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: after reading the present invention, those skilled in the art can still make various changes, modifications, or equivalent replacements to the specific implementation manners of the application, but these changes, modifications, or equivalent replacements are all within the scope of the protection of the claims pending for approval of the application.

Claims

1. A periodic energy injection test device for arrester performance testing, characterized in that: include: The arrester unit under test and the multiple energy injection structure; The multiple energy injection structure comprises: a power supply, multiple groups of capacitors, multiple switches, multiple thyristor valves and inductors, each group of the capacitors corresponds to one switch and one thyristor valve respectively; the power supply is connected to the corresponding capacitor through each switch to form a charging circuit for each group of the capacitors; each group of the capacitors is connected in series with the inductor and the tested arrester unit in sequence through the corresponding thyristor valve to form multiple groups of resonant current injection circuits for the tested arrester unit; Close a plurality of the switches and use the power supply to charge each group of the capacitors; periodically open each thyristor valve to discharge each group of the charged capacitors to the inductor and the tested lightning arrester unit; after the tested lightning arrester unit reaches the action voltage, the capacitor and the inductor generate a resonant current that is injected into the tested lightning arrester unit; based on the state of the tested lightning arrester unit after receiving the resonant current, analyze the performance of the tested lightning arrester unit.

2. The device according to claim 1, characterized in that The tested arrester unit is a qualified arrester unit or an arrester unit containing a defective valve plate.

3. The device according to claim 1, characterized in that Also included is a control unit connected to each of the switches and each of the thyristor valves respectively; The control unit periodically sends a control sequence to each switch and each thyristor valve to control the on and off of each switch to charge the capacitor corresponding to each switch, and controls the periodic opening of each thyristor valve.

4. The device according to claim 1, characterized in that Also includes: a current limiting arrester unit connected in series between the inductor and the arrester unit under test; The current limiting arrester unit is used to prevent the discharge of multiple groups of capacitors to the inductor to generate excessive resonant current after the tested arrester unit is short-circuited.

5. The device according to claim 4, characterized in that The current limiting arrester unit includes a plurality of valve plates connected in parallel, and the number of the valve plates is determined based on the energy absorption requirement of the current limiting arrester unit.

6. The device according to claim 1, characterized in that A bypass switch is connected in parallel at both ends of the tested lightning arrester unit to prevent the tested lightning arrester unit from exploding due to energy exceeding the limit when the tested lightning arrester unit is short-circuited.

7. The device according to claim 1, characterized in that The power supply is a high-voltage direct current charging power supply.

8. A periodic energy injection test method for lightning arrester performance testing, characterized in that: include: Based on a preset control timing, the switches between the power supply and the plurality of groups of capacitors are closed, and the plurality of groups of capacitors are charged by the power supply for a preset time to obtain the plurality of groups of capacitors after being charged; Based on the control timing, each thyristor valve is periodically opened to discharge each group of the charged capacitors to the inductor and the tested arrester unit. When the tested arrester unit reaches the operating voltage, the capacitor and the inductor are used to generate a resonant current to be injected into the tested arrester unit; Based on the state of the tested lightning arrester unit after receiving the resonant current, the performance of the tested lightning arrester unit is analyzed.

9. The method according to claim 8, characterized in that The method of periodically opening each thyristor valve based on the control timing so that each group of the charged capacitors discharges the inductor and the tested arrester unit, and when the tested arrester unit reaches the action voltage, using the capacitor and the inductor to generate a resonant current to be injected into the tested arrester unit comprises: Based on the control timing, the first thyristor valve is opened, so that the capacitor corresponding to the first thyristor valve discharges to the inductor and the tested arrester unit, and when the tested arrester unit reaches the action voltage, the capacitor and the inductor are used to generate a resonant current to be injected into the tested arrester unit; Based on the control timing, the second thyristor valve is turned on, so that the capacitor corresponding to the second thyristor valve discharges to the inductor and the tested arrester unit, and when the tested arrester unit reaches the action voltage, the capacitor and the inductor are used to generate a resonant current to be injected into the tested arrester unit; The third thyristor valve is opened based on the control timing, and so on, until the number of thyristor valves opened required by the test is reached.

10. The method according to claim 8, characterized in that After the resonant current is generated by the capacitor and the inductor and injected into the tested arrester unit, the method further includes: Closing the switch in the discharge circuit of each group of the capacitors to discharge each group of the capacitors; Each group of the discharged capacitors is grounded.

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