A multi-channel synchronous testing device for high-voltage lightning arrester and its use method

Abstract

The invention relates to the technical field of high-voltage lightning arrester testing, and provides a multi-channel synchronous testing device for a high-voltage lightning arrester and a method for using the same. The multi-channel synchronous testing device for a high-voltage lightning arrester comprises a user test operating table; a fast voltage regulating power supply, the user test operating table is connected to the fast voltage regulating power supply through a control cable or an optical cable; a direct current high-voltage generator, the output end of the fast voltage regulating power supply is connected to the power input end of the direct current high-voltage generator through a power cable; a plurality of lightning arrester test pieces, the high-voltage ends of the plurality of lightning arrester test pieces are connected in parallel and electrically connected to the output end of the direct current high-voltage generator; the low-voltage ends of the plurality of lightning arrester test pieces and the grounding end of the direct current high-voltage generator are connected in parallel to ground, the low-voltage end of each lightning arrester is provided with a current sampling device, and each current sampling device is connected to the user test operating table through a collection cable. The invention aims to provide a multi-channel synchronous testing device for a high-voltage lightning arrester and a method for using the same, which can test a plurality of high-voltage lightning arresters at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage lightning arrester testing, and in particular to a multi-channel synchronous testing device for a high-voltage lightning arrester and a method for using the same. Background Art

[0002] In recent years, with the rapid construction of UHV and EHV transmission projects in China, various substations, converter stations, etc. have a wide demand for UHV and HV arresters. It is well known that arresters are very important protective devices in power equipment, especially in the process of power transmission. Whether it is operating overvoltage or lightning overvoltage, it is limited by the arrester directly or indirectly connected to the protected equipment. The protection characteristics of the arrester directly affect the selection of the impulse insulation level and air gap distance of the substation equipment, and are the basis of the insulation coordination of the substation.

[0003] High-voltage arresters are generally metal oxide arresters. During use, they have to withstand operating voltage for a long time, and the internal resistor will have a continuous current passing through it. At the same time, when the high-voltage metal oxide arrester is subjected to lightning overvoltage or operating overvoltage and is instantly turned on, it will also withstand a huge short-circuit current and easily cause the resistor to age. Therefore, in order to ensure the normal use of high-voltage metal oxide arresters, the DC leakage current in the production process is an important performance test indicator for testing metal oxide arresters. At present, my country has made significant progress in the research and development and application of high-voltage arresters, and the overall level is at the forefront of the world, but it still needs to carry out a series of research, experiments and tests on ultra-high voltage arresters. At the same time, due to the growing demand for arresters in power station line construction, the production capacity of high-voltage arresters has also been severely tested.

[0004] As the test equipment for the above-mentioned high-voltage lightning arrester scientific research units or the performance testing equipment for high-voltage lightning arrester factory production, the voltage level of the traditional test device is generally below 200kV, and the current level is generally below 5mA. Its structure is often difficult to increase the current capacity due to the excessive number of series-connected voltage-doubling circuits and structural design. As a lightning arrester test equipment, it can only test a single medium and low voltage product, and generally can only perform voltage increase and decrease operations by manually adjusting the knob. The work intensity is large and the test efficiency is extremely low, which cannot meet the needs of product batch testing. At the same time, due to the abnormal discharge of the lightning arrester test product during the high-voltage test, the ground potential is often raised, the surge current is overvoltage, etc., and the traditional lightning arrester test device control adopts single-chip microcomputer technology, which has poor surge and interference resistance, and has no built-in safety grounding switch. It is often damaged by overvoltage and overcurrent breakdown, and may also cause major safety accidents such as casualties. A high-voltage arrester test device that can simultaneously have a high voltage level of more than 500kV, a high current level of more than 15mA, and can simultaneously test multiple sets of test products is an equipment that the relevant owners are eagerly looking forward to. Especially for high-voltage arrester products above 200kV, even if a composite jacket is used, the height of the arrester body is nearly two meters, which is often higher than the height of an adult. It is very heavy and difficult to carry frequently. If a porcelain sleeve is used, the height and weight will be further increased. However, as a test item for the arrester reference voltage and leakage current, the overall pressure application time only takes less than 3 minutes. However, before the high-voltage test, various high-voltage corona-free conductors, shielded voltage-equalizing rings, control cables, and measurement and safety grounding wires need to be reliably connected. In addition, the single-unit test data recording, on-site manual grounding rod layout, and safety area inspections often take more than 30 minutes at the fastest. For high-voltage test personnel, the labor intensity is extremely high and the work efficiency is extremely low, and it is very easy to cause equipment and test product damage or major casualties due to negligent operation. Summary of the invention

[0005] The object of the present invention is to provide a multi-channel synchronous testing device for high-voltage lightning arresters and a method for using the same, which can simultaneously test the DC reference voltage and the DC leakage current at 0.75 times the reference voltage of multiple high-voltage lightning arresters.

[0006] The embodiments of the present invention are realized through the following technical inventions: a multi-channel synchronous test device for high-voltage lightning arresters, including a user test console; a fast voltage regulating power supply, the user test console is connected to the fast voltage regulating power supply through a control cable or an optical cable; a DC high-voltage generator, the output end of the fast voltage regulating power supply is connected to the power input end of the DC high-voltage generator through a power cable; a plurality of lightning arrester test pieces, the high-voltage ends of the plurality of lightning arrester test pieces are connected in parallel and electrically connected to the output end of the DC high-voltage generator; the low-voltage ends of the plurality of lightning arrester test pieces and the grounding end of the DC high-voltage generator are grounded in parallel, the low-voltage end of each lightning arrester is provided with a current sampling device, and each current sampling device is connected to the user test console through a collection cable.

[0007] Furthermore, the user test console includes: an industrial control computer, a first PLC logic controller, a PCI high-speed acquisition card and a PLC high-speed AD module; the fast voltage-regulating power supply includes a fast power voltage regulating device, a high-speed acquisition board and a second PLC logic control circuit; the industrial control computer and the first PLC logic controller are communicatively connected to each other; the first PLC logic controller and the PLC high-speed AD module are communicatively connected to each other; the PLC high-speed AD module collects the voltage value of the DC high-voltage generator and the sampled and summarized current values ​​of several lightning arrester specimens through voltage loop 2 and current loop 2; the output end of the second PLC logic controller is communicatively connected to the fast power voltage regulating device and the high-speed acquisition board; the input end of the PCI high-speed acquisition card collects the current sampling signals of several lightning arrester specimens; the output end of the PCI high-speed acquisition card is connected to the industrial control computer; the second PLC logic controller collects the voltage value of the DC high-voltage generator and the sampled current values ​​of several lightning arrester specimens through voltage loop 1 and current loop 1.

[0008] Furthermore, the user test console is also provided with a manual operation button panel.

[0009] Furthermore, a safety grounding switch is provided in the DC high voltage generator.

[0010] Furthermore, several arrester test pieces are connected in parallel and connected via current limiting resistors and high voltage corona-free conductors.

[0011] A method for using a multi-channel synchronous testing device for a high-voltage lightning arrester comprises the following steps:

[0012] S1: Work preparation: Connect various components, check and confirm that they are correct, then turn on the control power supply to preheat the system and prepare for testing;

[0013] S2: Before performing the boost test, you need to select the current operation mode as automatic or manual. Manual mode is operated through the manual operation button panel, while automatic mode is completed through the computer interface and the PLC logic controller completes the one-button test;

[0014] S3: Select different channels as reference test channels through manual operation buttons or computer interface;

[0015] S4: Log in with the corresponding user rights through the industrial control computer interface, and set the test parameters and product number. After the system self-checks, it will be in a waiting state;

[0016] S5: By clicking the boost test button on the industrial control computer interface or pressing the 0.75U button on the manual operation button panel, the system will automatically perform grounding switch closing and opening operations, high-voltage switch opening and closing operations, and voltage step-up and step-down operations according to the set conditions, and perform tests according to the DC reference voltage of the arrester and the leakage current test process at 0.75 times the reference voltage;

[0017] S6: During the test, the system will display the current loop status and test data in real time. If there is an abnormality, the system will indicate the faulty test product at the corresponding position of the interface through sound and light signals. If there is no abnormality and when all test contents are completed, the system will automatically record and organize various parameters, and quickly reduce the voltage. When the conditions are met, the system will perform a safe grounding operation, and prompt the completion of the test and the safe grounding state with the interface color and on-site sound and light signals;

[0018] S7: The test is now completed and the user can enter the test area to complete the next batch of test products.

[0019] Furthermore, after processing, the current signal of the lightning arrester test piece generates two-way summary current and multiple leakage current test signals through photoelectric isolation. The summary current mainly completes the current loop feedback and program logic calculation, and the multiple test signals complete the reference current sampling and leakage current collection at 0.75 times the reference voltage.

[0020] Furthermore, the one-button test by the PLC logic controller in step S2 includes the following steps:

[0021] S21: When the DC leakage current of a lightning arrester test sample is collected as a preset reference current such as 1mA, the control system immediately performs voltage and current calibration and data recording. At the same time, the system continuously scans the current conditions of other channels. When they reach the reference current one by one or synchronously, the system continues to calibrate and record one by one or synchronously. When all channels are calibrated, the system calculates the 0.75 times reference voltage value corresponding to each test sample based on the data results;

[0022] S22: After analysis and sorting, the voltage is rapidly reduced one by one or synchronously in reverse according to the calibration data timestamp. When the voltage drops to 0.75 times the voltage value of a certain arrester test piece, the acquisition system recalibrates and records the voltage and leakage current value at this moment and stores and records them. The leakage current value at this moment is the leakage current value of the arrester at 0.75 times the reference voltage;

[0023] S23: Similarly, the system reduces the voltage in reverse order item by item and completes the test of the remaining products one by one or simultaneously;

[0024] S24: When all channels have completed calibration and data recording, the system will conduct a comprehensive analysis and calculation of the current loop 2 and the current acquisition data of each channel and the corresponding recorded voltage acquisition data, and correct the real-time voltage value of the high-voltage end of the lightning arrester when each target current value appears according to the summary current. Finally, after data processing and adjustment, the system will display the DC reference voltage value of each high-voltage lightning arrester, 0.75 times the reference voltage value, and the leakage current value of the test product under 0.75 times the reference voltage, etc. The test task is now completed.

[0025] The technical invention of the embodiments of the present invention has at least the following advantages and beneficial effects:

[0026] 1. The present invention can be used for the performance test of a single high-voltage lightning arrester and can also be used for the synchronous test of multiple high-voltage lightning arresters. The present invention adopts computer program control and adopts a PLC logic controller as a hardware control terminal. It can be operated manually or automatically or perform a one-key fully automatic test. The operation is simple and efficient, and can meet the needs of batch factory testing of products and computerized data recording. It is not affected by operator experience and environmental interference. The test data is analyzed and recorded by a computer and can be networked.

[0027] 2. To ensure the accurate measurement of arrester performance test parameters, the invention adopts external test current sampling boxes for each corresponding channel, which can objectively reflect the leakage current value of the arrester in the measured channel, and this value is not affected by the leakage current of the device voltage divider, manual grounding rod and other stray currents. At the same time, because it is at the ground potential end and uses photoelectric isolation computer remote collection, data reading is efficient and reliable, and it has high operational safety for high-voltage measurement and control environments.

[0028] 3. During the high-voltage test, abnormal discharge of the lightning arrester test piece often causes ground potential rise and surge overvoltage. This test device uses a highly reliable programmable logic controller PLC as the hardware control terminal and adopts photoelectric isolation acquisition control. It has good surge resistance and interference suppression capabilities, which can avoid control equipment breakdown and damage due to overvoltage and overcurrent, and can also avoid major safety accidents such as high-voltage electric shock casualties.

[0029] 4. The device of the present invention is designed with a safety grounding switch inside. The switch is controlled by the control system logic intelligence, which can realize the interlocking of various operating functions and automatic protective grounding in emergency situations, thereby avoiding major safety accidents such as misoperation by personnel or casualties or equipment damage caused by improper operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical invention of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic diagram of equipment connection of a multi-channel synchronous test device for high-voltage lightning arresters provided by the present invention;

[0032] Figure 2 A schematic diagram of partial circuit connections of a multi-channel synchronous test device for high-voltage lightning arresters provided by the present invention;

[0033] Figure 3 A test logic diagram of a multi-channel synchronous test device for a high-voltage lightning arrester provided by the present invention;

[0034] Icons: 10-User test operation table, 11-Industrial control computer, 12-Quick control button, 13-Computer interface, 14-Leakage current collection box, 20-Quick voltage regulating power supply, 21-Control cable, 22-Power cable, 30-DC high voltage generator, 31-Current limiting resistor, 32-Corona-free high voltage lead, 33-Grounding switch, 34-DC voltage divider unit, 35-DC voltage doubler unit, 36-Transformer, 41-No. 1 lightning arrester test piece, 42-No. 2 lightning arrester test piece, 43-No. 3 lightning arrester test piece, 44-Lightning arrester test insulation seat, 61-1 channel measurement cable, 62-1 channel collection cable, 71-2 channel measurement cable, 72-2 channel collection cable, 81-3 channel measurement cable, 82-3 channel collection cable, 90-Sampling box. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical invention and advantages of the embodiments of the present invention clearer, the technical invention in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the invented product is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Example

[0041] like Figure 1-2 As shown, a multi-channel synchronous test device for high-voltage lightning arresters includes a user test operation table 10, a fast voltage regulating power supply 20, a DC high voltage generator 30 and three high-voltage lightning arrester test pieces.

[0042] The user test console 10 is connected to the fast voltage regulating power supply 20 through the control cable or optical cable 21. The operator controls the working state of the fast voltage regulating power supply 20 through the user test console 10, and the fast voltage regulating power supply 20 feeds back voltage and current signals in real time. Specifically, the user test console 10 is used as a user terminal for equipment operation, and is displayed using but not limited to LED display screens and digital meters. It can set test parameters, display measurement data and status in real time, and exchange control information with the main body fast voltage regulating power supply 20 in real time, and display the status of each part of the system in the form of animation, icons or text in real time. The console is provided with high-voltage on and off buttons for starting the high-voltage power supply, the voltage up and down buttons are used to adjust the output voltage, the channel selection button is used to select the multi-channel test mode, the 0.75U button is used for automatic and rapid testing of the arrester parameters, and the manual automatic button is used for manual automatic function selection conversion. The control panel is provided with a voltmeter and an ammeter, and a multi-channel test product current digital display table is provided for the multi-channel test of the arrester, which can facilitate the tester to pay attention to the leakage current value of each channel of the arrester in real time.

[0043] The output end of the fast voltage regulating power supply 20 is connected to the power input end of the DC high-voltage generator 30 through a power cable 22 to provide initial power input; the high-voltage ends of several lightning arrester samples are connected in parallel and electrically connected to the output end of the DC high-voltage generator 30 through a current limiting resistor 31 and a high-voltage corona-free conductor; the low-voltage ends of several lightning arrester samples and the grounding end of the DC high-voltage generator 30 are grounded in parallel, and each lightning arrester low-voltage end is provided with a current sampling device, and each current sampling device is connected to the user test operating table 10 through a collection cable. A safety grounding switch 33 is provided in the DC high-voltage generator 30, and the discharge grounding at the end of the test or the automatic protection grounding in related emergency situations is realized through the safety grounding switch. The specific safety grounding switch 33 adopts the existing technology, such as the safety grounding switch 33 recorded in a special high voltage grounding switch 33 system disclosed in the Chinese patent application number CN201120501631.3.

[0044] Furthermore, the user test console 10 includes: a manual operation button panel, an industrial control computer 11, a first PLC logic controller, a PCI high-speed acquisition card and a PLC high-speed AD module; the fast voltage-regulating power supply 20 includes a fast power voltage regulating device, a high-speed acquisition board and a second PLC logic control circuit; the industrial control computer and the first PLC logic controller are communicatively connected to each other; the first PLC logic controller and the PLC high-speed AD module are communicatively connected to each other; the input and output ends of the PLC high-speed AD module collect the current summary signals of several lightning arrester test products; the output end of the second PLC logic controller is communicatively connected to the fast power voltage regulating device and the high-speed acquisition board; the input end of the PLC high-speed acquisition card collects the current sampling signals of several lightning arrester test products; the output end of the PLC high-speed AD module is connected to the fast voltage-regulating power supply phase-shift trigger adjustment control board; the PLC high-speed AD module collects the voltage value of the DC high-voltage generator 30 and the sample current values ​​of several lightning arrester test products through the voltage loop 2 and the current loop 2; the second PLC logic controller collects the voltage value of the DC high-voltage generator 30 and the sample current values ​​of several lightning arrester test products through the voltage loop 1 and the current loop 1.

[0045] In this embodiment, a method for using a multi-channel synchronous testing device for a high-voltage lightning arrester is also included, comprising the following steps:

[0046] 1. First, distribute the high-voltage lightning arresters to be tested on one side of the device, place the low-voltage end of each high-voltage lightning arrester on the lightning arrester test insulation seat 44, connect the corresponding sampling box 90 and the measurement and collection cable, and reliably connect the grounding end of each sampling box 90 and the grounding end of the DC high-voltage generator 30 to the grounding column of the test hall through the bus, use a special corona-free high-voltage wire and a voltage-equalizing ring to connect the high-voltage end of each high-voltage lightning arrester to the current-limiting resistor 31 end of the DC high-voltage generator 30, connect the user test console 10 control cable or optical cable 21 to the PLC-controlled fast voltage-regulating power supply 20 box, connect each channel collection cable to the leakage current collection box in the user test console 10, connect the fast voltage-regulating power supply 20 box to the corresponding input terminal of the DC voltage doubler body through the power cable 22, set a high-voltage live warning line (the system is equipped with door interlocking detection, and voltage can only be applied when the warning line or the test area door is locked), and then check and confirm that there is no error, then turn on the control power supply to preheat the system and prepare for testing.

[0047] 2. Before performing the boost test, you need to select the current operating mode as automatic or manual. Manual mode is operated through the aforementioned panel buttons, while automatic mode can complete a one-button intelligent test through a computer.

[0048] 3. Different channels can be selected as reference test channels through the aforementioned channel buttons. The purpose is that users can choose the test order at will, or the system can assign it.

[0049] 4. Log in with the corresponding user authority through the computer interface 13, and set the test parameters and product number. After the system self-checks, it will be in a waiting state.

[0050] 5. At this time, the user can directly click the boost test button on the interface or press the 0.75U button on the panel. The system will automatically perform the grounding switch 33 closing and opening operations, the high-voltage switch opening and closing operations, and the automatic voltage increase and decrease actions according to the set conditions, and perform the test according to the DC reference voltage of the lightning arrester and the leakage current test process under 0.75 times the reference voltage.

[0051] 6. During the test, the system will display the current circuit status and test data in real time. If there is any abnormality, the system will indicate the faulty test product at the corresponding position of the interface through sound and light signals. If there is no abnormality and when all test contents are completed, the system will automatically record and organize various parameters, and quickly reduce the voltage. When the conditions are met, the system will perform a safe grounding operation, and use the interface color and on-site sound and light signals to indicate that the test is completed and in a safe grounding state.

[0052] 7. The test is now complete and the user can enter the test area to complete the next batch of test products.

[0053] Since high-voltage lightning arresters, especially metal oxide lightning arresters, have excellent nonlinear volt-ampere characteristics, they are used as important equipment for overvoltage protection in power grids. Simply put, their resistance value is very large under normal working voltage, and the leakage current is very small, only a few μA, while the breakdown region has good nonlinearity, and the resistance value is very small, and the impact current that can be sustained is very large, almost nearly 100 kA, and the parameters of each product itself are not consistent, so it will become extremely difficult to test them simultaneously; the present invention is comprehensively designed from the aspects of the sensitivity of the measurement and control system, the response time of the operating system, the feedback loop of the voltage regulating power supply and the adjustment action time, the voltage doubling body structure and large-capacity design of the DC high-voltage device, and the non-interference connection of multiple test products to obtain the following method for realizing the simultaneous testing of multiple high-voltage lightning arresters, as follows.

[0054] like Figure 3 As shown, when multiple channels are tested simultaneously, the current changes will become nonlinear and show an exponential upward trend during the measurement process. The system adopts computer program control and uses PLC logic controller as the hardware control terminal. All modules use ultra-high-speed modules with a response time of μS level. The fast power supply adjustment part adopts independent ultra-high-speed PLC for logic control, and can perform voltage stabilization and current limiting operations in advance according to the test product conditions; after processing, the lightning arrester test product current signal generates two-way summary current and multiple-way leakage current test signals through photoelectric isolation. The summary current mainly completes the current loop feedback and program logic calculation, and the multiple test signals complete the DC reference current of each channel and the leakage current collection under 0.75 times the reference voltage. Specifically, when the test starts, each test product is pressurized at the same time. In this process, since the load current is very small, the device mainly participates in the work of voltage loop 2 to detect whether the voltage value of the fast voltage regulating power supply 20 is boosted in place through voltage loop 2. At this moment, the voltage is relatively stable. When the voltage is further increased until a certain test product reaches the reference voltage (usually the voltage corresponding to 1 mA of the test product), due to the characteristics of the lightning arrester, the current will fluctuate greatly at this time. At this moment, the voltage loop 1 and the current loop 1 participate in the work for negative feedback, and transmit the feedback data to the fast voltage regulating power supply 20. The fast voltage regulating power supply 20 stabilizes the voltage and current. At this moment, the current loop 2 is mainly used by the computer to perform comprehensive analysis and calculation on the current collection data of each channel and the corresponding recorded voltage collection data, and to correct the real-time voltage value of the high-voltage end of the lightning arrester when each target current value appears according to the summary current.

[0055] The specific working process is as follows:

[0056] S21: When the DC leakage current of a lightning arrester test sample is collected as a preset reference current such as 1mA, the control system immediately performs voltage and current calibration and data recording. At the same time, the system continuously scans the current conditions of other channels. When they reach the reference current one by one or synchronously, the system still performs calibration and recording in sequence or synchronously. When all channels are calibrated, the system calculates the 0.75 times voltage value corresponding to each test sample based on the data results;

[0057] S22: After analysis and sorting, the voltage is rapidly reduced one by one or synchronously in reverse according to the calibration data timestamp. When the voltage drops to 0.75 times the reference voltage value of a certain arrester test piece, the acquisition system recalibrates and records the voltage and leakage current value at this moment and stores and records them. The value at this moment is the leakage current value of the arrester at 0.75 times the reference voltage;

[0058] S23: Similarly, the system reduces the voltage in reverse order item by item and completes the test of the remaining products one by one or simultaneously;

[0059] S24: When all channels have completed calibration and data recording, the system will conduct a comprehensive analysis and calculation of the current loop 2 and the current acquisition data of each channel and the corresponding recorded voltage acquisition data, and correct the real-time voltage value of the high-voltage end of the lightning arrester when each target current value appears according to the summary current. Finally, after data processing and adjustment, the system will display the DC reference voltage value of each high-voltage lightning arrester, 0.75 times the reference voltage value, and the leakage current value of the test product under 0.75 times the reference voltage, etc. The test task is now completed.

[0060] Finally, it should be noted that in the present invention, there is no restriction on the type of DC high-voltage generator 30 used, as long as it meets the test requirements; however, if a large-capacity test equipment is used for architecture design, a special voltage-doubling rectifier structure is adopted, multiple voltage-equalizing measures are taken on the silicon stack, and the number of voltage-doubling stages is reduced as much as possible by increasing the stage voltage. The whole is oil-immersed or injected with inert gas to meet the insulation and heat dissipation requirements of large-capacity tests. A programmable PLC is used for rapid voltage regulation and logic operation control to meet the control reliability requirements of large-capacity high-voltage test equipment.

[0061] It should also be noted that the connection methods between components not specified in the present invention all adopt conventional high-voltage connections of existing equipment and are within the knowledge of those skilled in the art.

[0062] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-channel synchronous test device for high-voltage lightning arresters, characterized in that: include User test console; A fast voltage regulating power supply, wherein the user test operation platform is connected to the fast voltage regulating power supply via a control cable or an optical cable; A DC high voltage generator, wherein the output end of the fast voltage regulating power supply is connected to the power input end of the DC high voltage generator through a power cable; Several lightning arrester test pieces, the high-voltage ends of several lightning arrester test pieces are connected in parallel and electrically connected to the output end of the DC high-voltage generator; the low-voltage ends of several lightning arrester test pieces and the grounding end of the DC high-voltage generator are connected to the ground in parallel, each of the low-voltage ends of the lightning arrester is provided with a current sampling device, and each of the current sampling devices is connected to the user test operating table through a collection cable; The user test operation platform includes: an industrial control computer, a first PLC logic controller, a PCI high-speed acquisition card and a PLC high-speed AD module; the fast voltage-regulating power supply includes a fast power supply voltage-regulating device, a high-speed acquisition board and a second PLC logic control circuit; The industrial control computer is communicatively connected with the first PLC logic controller; The first PLC logic controller is communicatively connected with the PLC high-speed AD module; The PLC high-speed AD module collects the voltage value of the DC high-voltage generator and the aggregated current values ​​of several arrester samples through the second voltage loop and the second current loop, and is used to correct the real-time voltage value of the high-voltage end of the arrester when the arrester sample current is the target current in real time according to the aggregated current value; The output end of the second PLC logic controller is communicatively connected to the fast power supply voltage regulating device and the high-speed acquisition board; The input end of the PCI high-speed acquisition card collects current sampling signals of several lightning arrester samples; The A / D output terminal of the PCI high-speed acquisition card is connected to an industrial control computer; The second PLC logic controller collects the voltage value of the DC high-voltage generator and the total sampled current value of several lightning arrester samples through the first voltage loop and the first current loop. The total sampled current value is used to feed back to the fast voltage-regulating power supply to achieve voltage and current stabilization of the fast voltage-regulating power supply.

2. The multi-channel synchronous testing device for high-voltage lightning arresters according to claim 1, characterized in that: The user test operating table is also provided with a manual operation button panel.

3. The multi-channel synchronous testing device for high-voltage lightning arresters according to claim 2, characterized in that: A safety grounding switch is arranged inside the DC high voltage generator.

4. The multi-channel synchronous testing device for high-voltage lightning arresters according to claim 3, characterized in that: A number of the arrester test pieces are connected in parallel and then connected via a current limiting resistor and a high-voltage corona-free conductor voltage-equalizing ring.

5. A method for using the multi-channel synchronous testing device for high-voltage lightning arresters according to claim 4, characterized in that: The following steps are involved: S1: Work preparation: Connect various components, check and confirm that they are correct, then turn on the control power supply to preheat the system and prepare for testing; S2: Before performing the boost test, the current operation mode needs to be selected as automatic or manual. Manual mode is operated through the manual operation button panel, while automatic mode is completed through the computer interface operation and the first PLC logic controller completes the one-button test; S3: Select different channels as reference test channels through manual operation buttons or computer interface; S4: Log in with the corresponding user rights through the industrial control computer interface, and set the test parameters and product number. After the system self-checks, it will be in a waiting state; S5: By clicking the boost test button on the industrial control computer interface or pressing the 0.75U button on the manual operation button panel, the system will automatically perform grounding switch closing and opening operations, high-voltage switch opening and closing operations, and voltage step-up and step-down operations according to the set conditions, and automatically perform tests according to the arrester reference voltage and the leakage current test process at 0.75 times the reference voltage; S6: During the test, the system will display the current loop status and test data in real time. If there is an abnormality, the system will indicate the faulty test product at the corresponding position of the interface through sound and light signals. If there is no abnormality and when all test contents are completed, the system will automatically record and organize various parameters, and quickly reduce the voltage. When the conditions are met, the system will perform a safe grounding operation, and prompt the completion of the test and the safe grounding state with the interface color and on-site sound and light signals; S7: The test is now completed and the user can enter the test area to complete the next batch of test products.

6. The method for using the multi-channel synchronous testing device for high-voltage lightning arresters according to claim 5, characterized in that: After processing, the arrester test current signal generates two-way summary current and multiple leakage current test signals through photoelectric isolation. The summary current is used to complete the current loop feedback and program logic calculation, and the multiple test signals complete the DC reference current sampling and leakage current collection at 0.75 times the reference voltage.

7. The method for using the multi-channel synchronous testing device for high-voltage lightning arresters according to claim 6, characterized in that: The one-button test by the first PLC logic controller in step S2 includes the following steps: S21: When the DC leakage current of a lightning arrester test sample is collected as the preset reference current, the control system immediately performs voltage and current calibration and data recording. At the same time, the system continuously scans the current conditions of other channels. When they reach the reference current one by one or synchronously, the system still performs calibration and recording in sequence or synchronously. When all channels are calibrated, the system calculates the 0.75 times voltage value corresponding to each test sample based on the data results; S22: After analysis and sorting, the voltage is rapidly reduced one by one or synchronously in reverse according to the calibration data timestamp. When the voltage drops to 0.75 times the voltage value of a certain arrester test piece, the acquisition system recalibrates and records the voltage and leakage current value at this moment and stores and records them. The leakage current value at this moment is the leakage current value of the arrester at 0.75 times the reference voltage; S23: Similarly, the system reduces the voltage in reverse order item by item and completes the test of the remaining products one by one or simultaneously; S24: When all channels have completed calibration and data recording, the system will conduct a comprehensive analysis and calculation on the current acquisition data of the second current loop and each channel and the corresponding recorded voltage acquisition data, and correct the real-time voltage value of the high-voltage end of the lightning arrester when each target current value appears according to the summary current. Finally, after data processing and adjustment, the system will display the DC reference voltage value, 0.75 times the voltage value and the leakage current value at 0.75 times the reference voltage of each high-voltage lightning arrester. The test task is now completed.

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