Grounding test system and method and nonvolatile storage medium

Abstract

The invention discloses a grounding test system and method and a nonvolatile storage medium. The system comprises a grounding simulation platform, a three-phase large current generator, a remote control discharge device and a fault switching device, the grounding simulation platform comprises a simulation line, a fault simulation device, a monitoring system and the like, and the fault simulation device is used for simulating grounding faults and short circuit faults of preset types; the monitoring system is used for performing remote control opening and closing operation on the section switch and the interconnection switch so as to change the connection state of the analog circuit and monitor test data of each node in the analog circuit, and the test data comprises test current data and test voltage data; the grounding simulation platform further comprises a preset test position. The technical problems of low efficiency and existence of potential safety hazards caused by limited load current simulation capability of an experimental platform and manual discharge and fault switching are solved.

Description

Technical Field

[0001] The present application relates to the field of power system testing, and in particular, to a grounding test system, method and non-volatile storage medium. Background Art

[0002] To support the research on distribution network-related technologies, some units have established real distribution network laboratories that can be used to simulate the operation and fault conditions of distribution networks, including 10kV distribution network real experimental platforms. The 10kV distribution network real experimental platform has a flexible grid structure and multiple source-load access methods, and can simulate a variety of fault types, including single-phase grounding faults, two-phase and three-phase short-circuit faults. The single-phase grounding faults that can be simulated also include: metallic grounding faults, grounding faults with different resistance values ​​(0-3000Ω, group switching), arc grounding faults, and real-scene grounding faults (including gravel, mud, tree branches, water falling on the line, etc.).

[0003] Based on the distribution network real-type experimental platform, the State Grid Corporation can be supported to carry out single-phase ground fault real-type tests on the primary and secondary integrated pole-mounted circuit breaker complete sets to detect their ground fault analysis and handling performance. However, when conducting single-phase ground fault real-type tests based on the 10kV distribution network real-type experimental platform, the simulated load current is limited, and it is difficult to simulate a load current that matches the actual size; and when conducting multiple tests, it is necessary to manually change the wiring of the test equipment and manually discharge the equipment, which has low experimental efficiency and poses safety hazards.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present application provide a grounding test system, method and non-volatile storage medium to at least solve the technical problems of low efficiency and potential safety hazards caused by limited load current simulation capability of the experimental platform and manual discharge and fault switching.

[0006] According to one aspect of an embodiment of the present application, a grounding test system is provided, including a grounding simulation platform, a three-phase high current generator, a remote control discharge device, and a fault switching device, wherein the grounding simulation platform includes a simulation line, a fault simulation device, and a monitoring system, wherein the simulation line includes a section switch, a connecting switch, and a grounding transformer, the fault simulation device is used to simulate a preset type of grounding fault and short circuit fault, the monitoring system is used to remotely open and close the section switch and the connecting switch, thereby changing the connection state of the simulation line, and monitoring the test data of each node in the simulation line, the test data including test current data and test voltage data; the grounding simulation platform also includes a preset test position, wherein the preset test position is used to connect to the device to be tested; the three-phase high current generator is used to output a three-phase current with a phase difference of a preset phase difference between the system voltage of the grounding test system, and is used to simulate the load current flowing through the device to be tested; the remote control discharge device is used to discharge the grounding test system after a grounding test is completed; the fault switching device is used to determine the target preset fault point in the grounding test in the grounding simulation platform, wherein the target preset fault point is the preset fault point of the simulated fault occurrence position.

[0007] Optionally, the input and output ends of the three-phase high current generator are respectively connected to the two ends of the device under test to form a current loop with the device under test, wherein the device under test includes: a complete set of primary and secondary fused pole-mounted circuit breaker equipment and a complete set of primary and secondary fused ring network cabinet equipment.

[0008] Optionally, the three-phase high current generator includes a three-phase high current generating station and a control station, which are connected to each other through a communication line, wherein each phase body of the three-phase high current generating station includes two high-voltage bushings for connecting high-voltage cable connectors, and the current flows out from the high-voltage bushing on one side and flows into the high-voltage bushing on the other side; the control station is used to collect the voltage signal at the point where the three-phase high current generating station is connected to the grounding simulation platform, and control the three-phase high current generating station to generate a three-phase current with a preset phase difference from the phase of the voltage signal according to the voltage signal.

[0009] Optionally, controlling a three-phase large current generating station according to a voltage signal to generate a three-phase current having a phase difference with the voltage signal that is a preset phase difference includes: generating a control instruction according to the voltage signal, wherein the control instruction includes three-phase current waveform data having a phase difference with the voltage signal that is a preset phase difference; sending the control instruction to the three-phase large current generating station via a communication line, and each phase station in the three-phase large current generating station generates a time-synchronized current according to the control instruction, thereby generating a three-phase current.

[0010] Optionally, the remote control discharge device is also used to: after the incoming power supply of the grounding test system is disconnected, control the closing of the discharge device contactor in the grounding simulation platform through the monitoring system to discharge the cables and capacitors in the grounding test system.

[0011] Optionally, the fault switching device is provided with four common busbars representing the three phases A, B, and C and the earth, and a plurality of branches are respectively led out from the four busbars, each branch being connected to an external incoming line through four single-phase contactors; the grounding simulation platform includes a plurality of preset fault points, and each preset fault point is connected to a group (4) of single-phase contactors of the fault switching device through four cables, wherein the single-phase contactor is used to control the connection status between each phase of the preset fault point and the equivalent earth impedance and the common busbar in the fault switching device; the single-phase grounding fault simulation device and the short-circuit fault simulation device in the grounding simulation platform are also connected to the common busbar in the fault switching device through cables, wherein the single-phase grounding fault simulation device is connected to the common busbar through four single-phase contactors, and the tail ends of the three single-phase contactors of phase A, phase B, and phase C are connected in parallel, and only one can be turned on at any time.

[0012] Optionally, the grounding test system also includes an adjustable capacitor cabinet, wherein the adjustable capacitor cabinet is used to simulate the three-phase capacitor current in the system.

[0013] According to another aspect of an embodiment of the present application, a grounding test method is also provided, which is applicable to the above-mentioned grounding test system, including: after the device to be tested is connected to the grounding simulation platform, a high current generator is connected to the device to be tested, wherein the high current generator is used to simulate the load current flowing through the device to be tested; setting the protection configuration and protection setting of each level of circuit breakers on the simulated line in the grounding simulation platform; controlling the closing of each level of circuit breakers in the grounding simulation platform and powering on the grounding test system, and controlling the high current generator to output a three-phase current of preset size and phase as the load current; selecting a target preset fault point from multiple preset fault points, and simulating a preset grounding fault at the target preset fault point; in the process of simulating the preset grounding fault, confirming whether the switch of the device to be tested is actuated, and obtaining the recorded waveform information of the grounding simulation platform through the monitoring system, and generating fault judgment information based on the recorded waveform information, wherein the fault judgment information includes fault type information and fault range information.

[0014] Optionally, the grounding test method further includes: after simulating a preset grounding fault, cutting off the incoming power supply of the grounding test system, and discharging the capacitors and cables in the grounding test system through a remote control discharge device.

[0015] According to another aspect of an embodiment of the present application, a non-volatile storage medium is provided, in which a program is stored, wherein when the program is executed, a device where the non-volatile storage medium is located is controlled to execute a grounding test method.

[0016] In the embodiment of the present application, a grounding test system is used, including a grounding simulation platform, a three-phase high current generator, a remote control discharge device, and a fault switching device, wherein:

[0017] The grounding simulation platform includes a simulation line, a fault simulation device and a monitoring system, wherein the simulation line includes a section switch, a connecting switch and a grounding transformer, the fault simulation device is used to simulate a preset type of grounding fault and short circuit fault, and the monitoring system is used to remotely open and close the section switch and the connecting switch, thereby changing the connection state of the simulation line, and monitoring the test data of each node in the simulation line, the test data including test current data and test voltage data; the grounding simulation platform also includes a preset test position, wherein the preset test position is used to connect the device to be tested; a three-phase high current generator is used to output a three-phase current with a phase difference of a preset phase difference with the system voltage of the grounding test system, and is used to simulate the current flowing through the device to be tested load current; a remote control discharge device, used to discharge the grounding test system after a grounding test is completed; a fault switching device, used to determine the target preset fault point in the grounding test in the grounding simulation platform, wherein the target preset fault point is a preset fault point at the location where the simulated fault occurs. By integrating the grounding simulation platform, the three-phase large current generator, the remote control discharge device and the fault switching device in the distribution network real experiment platform, the simulated load current range, the automatic discharge operation and the rapid switching of the fault point are expanded, thereby achieving the technical effect of improving the efficiency and safety of grounding fault simulation and detection, and further solving the technical problems of low efficiency and potential safety hazards caused by the limited load current simulation capacity of the experimental platform and the manual operation of discharge and fault switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 It is a logical structure diagram of a grounding test system provided according to an embodiment of the present application;

[0020] Figure 2 is a structural schematic diagram of a grounding test system provided according to an embodiment of the present application;

[0021] Figure 3 is a structural schematic diagram of a three-phase high current generator provided according to an embodiment of the present application;

[0022] Figure 4 is a structural schematic diagram of a remote control discharge device provided according to an embodiment of the present application;

[0023] Figure 5It is a structural schematic diagram of a fault switching device provided according to an embodiment of the present application;

[0024] Figure 6 It is a structural schematic diagram of a computer terminal (mobile device) provided according to an embodiment of the present application;

[0025] Figure 7 It is a flow chart of a grounding test method provided according to an embodiment of the present application;

[0026] Figure 8 This is a schematic diagram of connecting a high current generator and a device under test according to an embodiment of the present application;

[0027] Fig. 9 It is a schematic diagram of the structure of a high current generator access experimental platform provided according to an embodiment of the present application;

[0028] Fig.10 It is a schematic diagram of the structure of a high current generator access experimental platform provided according to an embodiment of the present application;

[0029] Fig.11 It is a schematic diagram of connecting a high current generator and a device under test according to an embodiment of the present application.

[0030] The components in the figure are:

[0031] 01. Simulation platform; 02. Three-phase high current generator; 03. Remote control discharge device; 04. Fault switching device; 05. Simulation line; 06. Fault simulation device; 07. Monitoring system; 08. Section switch; 09. Contact switch; 10. Grounding transformer; 11. Three-phase high current generator; 12. Control console; 13. Equipment to be tested (including complete set of primary and secondary fusion pole-mounted circuit breakers, complete set of primary and secondary fusion ring network cabinets, etc.); 14. Single-phase contactor; 15. High current generator. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] In the related art, the load current simulation of the experimental platform is limited, and it is difficult to simulate the load current that matches the actual current size; and when conducting tests at different fault points and multiple tests, it is necessary to manually change the wiring of the test equipment and manually discharge the equipment, which is time-consuming and labor-intensive, and has low experimental efficiency. At the same time, there are also problems such as loose contact of the connecting hardware and the connection cables often dragging back and forth between different fault points, which poses a major safety hazard and poor aesthetics. In order to solve the above problems, the embodiments of the present application provide relevant solutions, which are described in detail below.

[0035] The present application embodiment provides a grounding test system, such as Figure 1 As shown, the grounding test system includes a grounding simulation platform 01, a three-phase high current generator 02, a remote control discharge device 03, and a fault switching device 04, wherein the grounding simulation platform 01 includes a simulation line 05, a fault simulation device 06, and a monitoring system 07, wherein the simulation line 05 includes a section switch 08, a connecting switch 09, and a grounding transformer 10, the fault simulation device 06 is used to simulate a preset type of grounding fault and short circuit fault, and the monitoring system 07 is used to remotely open and close the section switch 08 and the connecting switch 09, thereby changing the connection state of the simulation line 05, and monitoring the test status of each node in the simulation line 05. The test data includes test current data and test voltage data; the grounding simulation platform 01 also includes a preset test position, wherein the preset test position is used to connect the device to be tested; a three-phase large current generator 02 is used to output a three-phase current with a phase difference of a preset phase difference between the system voltage of the grounding test system and the system voltage, so as to simulate the load current flowing through the device to be tested; a remote control discharge device 03 is used to discharge the grounding test system after a grounding test is completed; a fault switching device 04 is used to determine the target preset fault point in the grounding test in the grounding simulation platform 01, wherein the target preset fault point is the preset fault point of the simulated fault occurrence position.

[0036] Specifically, the grounding test system structure diagram is as follows: Figure 2 As shown, the system has a 10kV power supply line, a single busbar segmented structure, and the I-section busbar is connected to the grounding transformer 10, which can simulate a variety of grounding methods (such as: the neutral point of the grounding transformer 10 is connected to the arc suppression coil system, which can simulate the grounding method through the arc suppression coil); it can simulate multiple cables and overhead lines, configured with line impedances with different parameters, and multiple segment switches 08 (circuit breakers) and contact switches 09 (circuit breakers); an adjustable capacitor cabinet is used to simulate the system capacitance current, and the system three-phase capacitance current range can be simulated in the range of 0 to 150A ; It is equipped with a fault simulation device 06, which can simulate various types of single-phase grounding faults; the experimental platform is equipped with a monitoring system 07, which can remotely control the opening and closing operations of all circuit breakers (switches) on the experimental platform; the monitoring system 07 can also monitor the voltage and current of each node in the experimental platform and the status of each switch and other data and waveforms in real time; the experimental platform has a reserved test position for connecting the equipment to be tested 13 (which can be a complete set of primary and secondary integrated pole-mounted circuit breaker equipment 13, or a complete set of primary and secondary integrated ring network cabinet equipment 13) to detect it.

[0037] Specifically, the structure of the three-phase high current generator 02 is as follows: Figure 3 As shown, the three-phase high current generator 02 is composed of a three-phase high current generating platform 11 of A, B, and C and a control console 12. The control console 12 and the three-phase platform 11 are connected by optical fiber; each phase platform has two high-voltage bushings for connecting high-voltage cable connectors (elbow-shaped heads), and the current flows out from one high-voltage bushing and flows into the other high-voltage bushing. The control console 12 collects the voltage signal at the point where the three-phase platform 11 is connected to the experimental platform (that is, the device to be tested), generates three-phase high current waveform data with a certain phase difference from the three-phase voltage as required, and sends it to the three-phase platform 11 through optical fiber. Each phase platform generates a time-synchronized current waveform based on this, and outputs it to the primary and secondary fusion column-mounted circuit breaker complete set 13 to be tested through high-voltage bushings and high-voltage flexible cables. By configuring the three-phase high current generator 02, its output can be controlled to have a certain phase difference with the system voltage, and the adjustable phase current range is 0 to 700A. The input and output ends of the high current generator are respectively connected to the two ends of the device to be tested 13 (which can be a primary and secondary fused pole-mounted circuit breaker complete set 13, or a primary and secondary fused ring network cabinet complete set 13), forming a current loop. The high current generated by the high current generator only flows through this loop, thereby simulating the load current flowing through the device to be tested.

[0038] Specifically, the remote control discharge device 03 is as follows Figure 4 As shown, the remote control discharge device 03 is composed of a switch (contactor) and a discharge resistor. The resistance value of the discharge resistor can be configured according to the experimental environment, such as Figure 4As shown, it can be connected to the bus or line. After a grounding test, there will be charges in the capacitors and cables in the experimental platform, which need to be discharged. After the incoming power supply is disconnected, the system is discharged by closing the contactor of the remote control discharge device 03 in the monitoring background, thus avoiding manual discharge operation. Under the 150A system current, the discharge resistor is selected as 500Ω, and the instantaneous value of the instantaneous current of the discharge is 25A, which will not damage the system, and the electricity can be discharged in 100ms.

[0039] Specifically, the schematic diagram of the fault switching device 04 is as follows Figure 5 As shown, multiple preset fault points can be arbitrarily selected in the experimental platform, and each fault point is led to the common bus through four single-phase contactors 14. The A phase, B phase, C phase and equivalent earth impedance of any fault point are connected to the common bus through the opening and closing of the single-phase contactor 14. The original single-phase grounding fault simulation device 06 is also connected to the common bus, wherein the single-phase grounding fault generator is connected to the common bus through four single-phase contactors 14, and the tail ends of the three single-phase contactors 14 of phase A, phase B and phase C are connected in parallel, and only one can be turned on at any time to prevent metallic short circuit.

[0040] In some embodiments of the present application, the device to be tested 13 (switch) is connected to the distribution network real-type experimental platform, and the large current generator is connected to simulate the load current flowing through the switch; the protection configuration and protection setting of each level of circuit breakers on the test line are set; the circuit breakers at each level are remotely controlled to close and the system is powered on; the controller of the large current generator is remotely controlled to output the current of the specified size and phase; the first fault point is selected, and the corresponding circuit breaker of the fault simulation device 06 is remotely controlled by the monitoring platform to close the ground fault test to see whether the device to be tested 13 (switch) can trip; the monitoring platform checks the recorded waveform file, analyzes the fault type and fault range, etc.; after the test, the remote discharge operation is performed. The system is powered on again, and the size and phase of the output current of the large current generator are adjusted to verify the influence of different load currents on the fault handling performance of the switch to be tested; the second fault point can also be selected, and the corresponding circuit breaker of the fault simulation device 06 is remotely controlled by the monitoring platform to close the ground fault test to see whether the device to be tested 13 (switch) can trip.

[0041] According to an embodiment of the present application, a method embodiment of a grounding test method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0042] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Figure 6FIG. 1 shows a hardware structure block diagram of a computer terminal (or mobile device) for implementing a grounding test method. Figure 6 As shown, the computer terminal 60 (or mobile device 60) may include one or more (602a, 602b, ..., 602n are used to illustrate) processors 602 (the processor 602 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 604 for storing data, and a transmission module 606 for communication functions. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the BUS bus), a network interface, a power supply and / or a camera. It can be understood by those skilled in the art that Figure 6 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 6 More or fewer components as shown, or with Figure 6 Different configurations are shown.

[0043] It should be noted that the one or more processors 602 and / or other data processing circuits described above may generally be referred to herein as "data processing circuits". The data processing circuits may be embodied in whole or in part as software, hardware, firmware, or any other combination thereof. In addition, the data processing circuit may be a single independent processing module, or may be incorporated in whole or in part into any of the other components in the computer terminal 60 (or mobile device). As described in the embodiments of the present application, the data processing circuit acts as a processor control (e.g., selection of a variable resistor terminal path connected to an interface).

[0044] The memory 604 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the grounding test method in the embodiment of the present application. The processor 602 executes various functional applications and data processing by running the software programs and modules stored in the memory 604, that is, to implement the vulnerability detection method of the above-mentioned application. The memory 604 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 604 may further include a memory remotely arranged relative to the processor 602, and these remote memories may be connected to the computer terminal 60 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0045] The transmission device 606 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the computer terminal 60. In one example, the transmission device 606 includes a network adapter (Network Interface Controller, NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 606 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0046] The display may be, for example, a touch screen liquid crystal display (LCD) that enables a user to interact with a user interface of the computer terminal 60 (or mobile device).

[0047] Under the above operating environment, the present application embodiment provides a grounding test method, such as Figure 7 As shown, the method comprises the following steps:

[0048] Step S702, after the device under test 13 is connected to the grounding simulation platform 01, a high current generator is connected to the device under test 13, wherein the high current generator is used to simulate the load current flowing through the device under test 13;

[0049] In some embodiments of the present application, the high current generator 15 is connected to the device under test 13, including the input and output ends of the high current generator 15 being respectively connected to the two ends of the device under test 13 (which can be a primary and secondary fusion pole-mounted circuit breaker complete set 13, or a primary and secondary fusion ring network cabinet complete set 13), to form a current loop, and the high current emitted by the high current generator 15 only flows through this loop, so as to simulate the load current flowing through the device to be tested. The high current generator 15 is connected to the device under test 13 through a flexible cable, and the output current of the high current generator 15 is output from the high-voltage bushing on one side thereof, flows into the primary and secondary fusion switch inlet terminal through the high-voltage flexible cable, and then flows out from the primary and secondary fusion switch outlet terminal, and flows into the high-voltage bushing on the other side of the high current generator 15 through the high-voltage flexible cable. Figure 8 , Fig. 9 shown.

[0050] In some embodiments of the present application, connecting the high current generator 15 to the device under test 13 includes connecting multiple devices under test 13 (device under test 13 + device under test 13, or device under test 13 + line impedance + device under test 13) to form a current loop, and the generated high current only flows through this loop to simulate the load current flowing through the device to be tested. The specific connection method is as follows Fig.10 , Fig.11 shown.

[0051] Step S604, setting the protection configuration and protection setting value of each level of circuit breakers on the simulation line 05 in the grounding simulation platform 01;

[0052] Step S606, controlling the circuit breakers of each level in the grounding simulation platform 01 to close and power on the grounding test system, and controlling the large current generator 15 to output a three-phase current of a preset magnitude and phase as a load current;

[0053] In some embodiments of the present application, the remote control discharge device 03 is composed of a switch (contactor) and a discharge resistor, which can be connected to a bus or line. After completing a grounding test, there will be charges in the capacitors and cables in the experimental platform, which need to be discharged. After disconnecting the incoming power supply, the system is discharged by monitoring the backstage remote control discharge device 03 contactor closing, thereby avoiding manual discharge operation. Under the 150A system current, the discharge resistor is selected to be 500Ω, and the instantaneous value of the instantaneous current of the discharge is 25A, which will not damage the system, and the electricity can be discharged in 100ms.

[0054] Step S608, selecting a target preset fault point from a plurality of preset fault points, and simulating a preset ground fault at the target preset fault point;

[0055] In some embodiments of the present application, multiple preset fault points can be arbitrarily selected in the experimental platform, and each fault point is led to the common bus through four single-phase contactors 14, and the A phase, B phase, C phase and equivalent earth impedance of any fault point are connected to the common bus through the opening and closing of the single-phase contactor 14. The original single-phase grounding fault simulation device 06 is also connected to the common bus, wherein the single-phase grounding fault generator is connected to the common bus through four single-phase contactors 14, and the tail ends of the three single-phase contactors 14 of phase A, phase B, and phase C are connected in parallel, and only one can be turned on at any time to prevent metallic short circuit.

[0056] Step S610, in the process of simulating a preset grounding fault, confirm whether the switch of the device under test 13 is actuated, obtain the recorded waveform information of the grounding simulation platform 01 through the monitoring system 07, and generate fault judgment information based on the recorded waveform information, wherein the fault judgment information includes fault type information and fault range information.

[0057] In some embodiments of the present application, the device to be tested 13 (switch) is connected to the distribution network real-type experimental platform, and the large current generator 15 is connected to simulate the load current flowing through the switch; the protection configuration and protection setting of each level of circuit breakers on the test line are set; the circuit breakers at each level are remotely controlled to close and the system is powered on; the controller of the large current generator 15 is used to remotely control the large current generator 15 to output a current of a specified magnitude and phase; the first fault point is selected, and the corresponding circuit breaker of the fault simulation device 06 is remotely controlled by the monitoring platform to close the ground fault test to see whether the device to be tested 13 (switch) can trip; the monitoring platform checks the recorded waveform file, analyzes the fault type and fault range, etc.; after the test, a remote discharge operation is performed. The system is powered on again, and the magnitude and phase of the output current of the large current generator 15 are adjusted to verify the influence of different load currents on the fault handling performance of the switch to be tested; the second fault point can also be selected, and the corresponding circuit breaker of the fault simulation device 06 is remotely controlled by the monitoring platform to close the ground fault test to see whether the device to be tested 13 (switch) can trip.

[0058] Through the above steps, it is possible to efficiently and safely simulate various single-phase grounding faults and equipment performance tests under load current conditions in the distribution network real-type experimental platform, significantly improving the flexibility, safety and efficiency of the test. Specifically, this application has the following advantages:

[0059] 1. A large current generator 15 is configured in the distribution network real-type experimental platform, and the output current size and phase can be adjusted; the input and output ends of the large current generator 15 are respectively connected to the two ends of the device to be tested 13 to form a current loop, and the large current generated by the large current generator 15 only flows through this loop, thereby simulating the load current flowing through the device to be tested. The large current generator 15 can be connected to one or more devices under test. This solves the problem of limited simulated load current of the current experimental platform.

[0060] 2. The test system is equipped with a remote-controlled discharge device and an automatic fault switching device. After each test, the system is discharged by closing the contactor of the remote-controlled discharge device 03 in the monitoring background, avoiding the manual discharge operation of the equipment. The fully automated simulation capability of single-phase grounding at any fault point and any phase is realized, which improves the test efficiency and reduces the workload and safety factors caused by personnel changing the wiring.

[0061] The embodiment of the present application provides a non-volatile storage medium, in which a program is stored, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following grounding test method: The grounding test method is applicable to the above-mentioned grounding test system, including: after the device under test 13 is connected to the grounding simulation platform 01, a large current generator 15 is connected to the device under test 13, wherein the large current generator 15 is used to simulate the load current flowing through the device under test 13; setting the protection configuration and protection setting value of each level of circuit breakers on the simulation line 05 in the grounding simulation platform 01; controlling the grounding The circuit breakers at all levels in the ground simulation platform 01 are closed and the grounding test system is powered on, and the high current generator 15 is controlled to output a three-phase current of a preset size and phase as the load current; a target preset fault point is selected from multiple preset fault points, and a preset grounding fault is simulated at the target preset fault point; in the process of simulating the preset grounding fault, it is confirmed whether the switch of the device under test 13 is actuated, and the recorded waveform information of the grounding simulation platform 01 is obtained through the monitoring system 07, and fault judgment information is generated based on the recorded waveform information, wherein the fault judgment information includes fault type information and fault range information.

[0062] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0063] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0064] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0065] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0066] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the relevant technology or all or part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc. Various media that can store program codes.

[0067] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A grounding test system, characterized in that: It includes a grounding simulation platform, a three-phase high current generator, a remote control discharge device, and a fault switching device, among which: The grounding simulation platform comprises a simulation line, a fault simulation device and a monitoring system, wherein the simulation line comprises a section switch, a connecting switch and a grounding transformer, the fault simulation device is used to simulate a preset type of grounding fault and short circuit fault, and the monitoring system is used to remotely open and close the section switch and the connecting switch, thereby changing the connection state of the simulation line, and monitoring the test data of each node in the simulation line and the action state of each switch, wherein the test data comprises test current data and test voltage data, and the action state of the switch comprises switch closed and switch open; The grounding simulation platform further includes a preset test position, wherein the preset test position is used to access the device to be tested; The three-phase large current generator is used to output a three-phase current having a phase difference with the system voltage of the grounding test system being a preset phase difference, so as to simulate the load current flowing through the device under test; The remote control discharge device is used to discharge the grounding test system after a grounding test is completed; The fault switching device is used to determine the target preset fault point in the grounding test in the grounding simulation platform, wherein the target preset fault point is a preset fault point at the location where the simulated fault occurs.

2. The grounding test system according to claim 1, characterized in that: The input and output ends of the three-phase high current generator are respectively connected to the two ends of the device under test to form a current loop with the device under test, wherein the device under test includes: a complete set of primary and secondary fused pole-mounted circuit breaker equipment and a complete set of primary and secondary fused ring network cabinet equipment.

3. The grounding test system according to claim 1, characterized in that: The three-phase high current generator includes a three-phase high current generating station and a control station, and the three-phase high current generating station and the control station are connected via a communication line, wherein: Each phase body of the three-phase high current generating station includes two high-voltage bushings for connecting high-voltage cable connectors, and the current flows out from the high-voltage bushing on one side and flows into the high-voltage bushing on the other side; The console is used to collect the voltage signal at the point where the three-phase large current generating station is connected to the ground simulation platform, and control the three-phase large current generating station to generate a three-phase current with a phase difference of the preset phase from the voltage signal according to the voltage signal.

4. The grounding test system according to claim 3, characterized in that: Controlling the three-phase large current generating station to generate a three-phase current having a phase difference with the voltage signal being the preset phase difference according to the voltage signal comprises: Generate a control instruction according to the voltage signal, wherein the control instruction includes three-phase current waveform data whose phase difference with the voltage signal is the preset phase difference; The control instruction is sent to the three-phase large current generating station through the communication line, and each phase station in the three-phase large current generating station generates a time-synchronized current according to the control instruction, thereby generating the three-phase current.

5. The grounding test system according to claim 1, characterized in that: The remote control discharge device is also used for: After the incoming power supply of the grounding test system is disconnected, the monitoring system controls the contactor of the discharge device in the grounding simulation platform to close to discharge the cables and capacitors in the grounding test system.

6. The grounding test system according to claim 1, characterized in that: The fault switching device is provided with 4 common busbars representing the three phases A, B, C and the earth respectively, and multiple branches are led out from the 4 busbars respectively, and each branch is connected to the external incoming line through 4 single-phase contactors respectively; The grounding simulation platform includes a plurality of the preset fault points, and each of the preset fault points is connected to a group (4) of single-phase contactors of the fault switching device through 4 cables, wherein the single-phase contactors are used to control the connection state between each phase of the preset fault point and the equivalent earth impedance and the common bus in the fault switching device; The single-phase grounding fault simulation device and the short-circuit fault simulation device in the grounding simulation platform are also connected to the common bus in the fault switching device through cables, wherein the single-phase grounding fault simulation device is connected to the common bus through four single-phase contactors, and the tail ends of the three single-phase contactors of phase A, phase B, and phase C are connected in parallel, and only one can be turned on at any time.

7. The grounding test system according to claim 1, characterized in that: The grounding test system also includes an adjustable capacitor cabinet, wherein the adjustable capacitor cabinet is used to simulate the three-phase capacitor current in the system.

8. A grounding test method, characterized in that: The grounding test system according to any one of claims 1 to 7 comprises: After the device under test is connected to the grounding simulation platform, the high current generator is connected to the device under test, wherein the high current generator is used to simulate the load current flowing through the device under test; Setting the protection configuration and protection setting value of each level of circuit breakers on the simulated line in the grounding simulation platform; Controlling the circuit breakers of each level in the grounding simulation platform to close and power on the grounding test system, and controlling the high current generator to output a three-phase current of a preset magnitude and phase as the load current; Selecting the target preset fault point from a plurality of preset fault points, and simulating a preset grounding fault at the target preset fault point; In the process of simulating the preset grounding fault, confirm whether the switch of the equipment under test is actuated, obtain the recorded waveform information of the grounding simulation platform through the monitoring system, and generate fault judgment information based on the recorded waveform information, wherein the fault judgment information includes fault type information and fault range information.

9. The grounding test method according to claim 8, characterized in that: The grounding test method further comprises: After simulating the preset grounding fault, the incoming power supply of the grounding test system is cut off, and the capacitors and cables in the grounding test system are discharged through the remote control discharge device.

10. A non-volatile storage medium, characterized in that: The non-volatile storage medium stores a program, wherein when the program is executed, the device where the non-volatile storage medium is located is controlled to execute the grounding test method according to any one of claims 8 to 9.

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