CN-121978604-A - Surge test misoperation problem point positioning system and method based on relay protection device

CN121978604ACN 121978604 ACN121978604 ACN 121978604ACN-121978604-A

Abstract

The invention discloses a surge test misoperation problem point positioning system and method based on a relay protection device in the field of relay protection electromagnetic compatibility tests of power systems, and aims to solve the problem that quick and systematic positioning is difficult to cause when misoperation occurs in the relay protection device. The system comprises a surge coupling network, a relay protection tester, a relay protection device and a surge signal generator, wherein the relay protection tester is connected with an AE PORT of the surge coupling network and is used for outputting traffic, the relay protection device comprises a network PORT communication module, the relay protection device is connected with an EUT PORT of the surge coupling network, the traffic is applied to the tested relay protection device through the AE PORT and the EUT PORT, the surge signal generator is connected with the surge coupling network, the network PORT communication module is connected with an input end of a switch, and an output end of the switch is connected with a PC. The invention can realize the rapid and accurate layered positioning of the surge test misoperation problem.

Inventors

XUE LIANG
YUE FENG
SHI ZHIWEI
WU YAN
ZHANG PENG
TANG BAOWEN

Assignees

南京国电南自软件工程有限公司

Dates

Publication Date: 20260505
Application Date: 20260122

Claims (10)

1. A surge test misoperation problem point positioning system based on a relay protection device is characterized by comprising: A surge coupling network (4); The relay protection tester (2) is connected with an auxiliary equipment port of the surge coupling network (4) and is used for outputting traffic; The relay protection device (1) comprises a network port communication module (7), wherein the relay protection device (1) is connected with a tested equipment port of the surge coupling network (4), and the alternating current quantity is applied to the relay protection device (1) to be tested through the tested equipment port through the auxiliary equipment port; a surge signal generator (3) connected with a high voltage output port, a common reference port and a protection ground port of the surge coupling network (4); the input end of the switch (5) is connected with the network port communication module (7); the PC (6) is connected with the output end of the switch (5); The high-voltage probe is used for collecting the surge signals output by the surge signal generator (3); And the comparison test device is used for replacing the module in the relay protection device (1) in the positioning process and performing surge test.
2. The surge test malfunction point location system based on a relay protection device according to claim 1, wherein the relay protection device (1) comprises: An alternating current module (8) comprising a voltage transformer and a current transformer for converting alternating current from the relay protection tester (2) into alternating current analog signals and performing the same through the voltage transformer and the current transformer A motherboard module connected with the alternating current module (8) and used for transmitting the alternating current analog signal to a CPU module; The CPU module comprises an A/D conversion module, a field programmable gate array module, a CPU module and a network port communication module (7), wherein the A/D conversion module is used for converting the alternating current analog signal into a digital signal, the FPGA module is used for carrying out interpolation synchronous processing on the digital signal to obtain a sampling message, the CPU module is used for carrying out filtering processing on the sampling message to obtain noise-free and interference-free data and judging whether to carry out protection tripping operation or not based on the noise-free and interference-free data, and the network port communication module (7) is used for sending the sampling message to the PC (6).
3. The surge test malfunction point positioning system based on a relay protection device according to claim 1, wherein the relay protection tester (2) is configured to provide the relay protection device (1) with a current traffic volume and a voltage traffic volume for testing.
4. The surge test misoperation problem point positioning system based on the relay protection device according to claim 3, wherein the output precision of the current alternating current quantity is-0.001A, and the output precision of the voltage alternating current quantity is-0.001V.
5. The surge test misoperation problem point positioning system based on the relay protection device according to claim 4, wherein a high voltage output port, a common reference port and a protection ground port of the surge coupling network (4) are respectively and correspondingly connected with the high voltage output port, the common reference port and the protection ground port of the surge generator (3); the L, N, PE port of the tested equipment port of the surge coupling network (4) is correspondingly connected with the L, N, PE port of the relay protection device (1), and the L, N, PE port of the auxiliary equipment port of the surge coupling network (4) is correspondingly connected with the L, N, PE port of the relay protection tester (2); the voltage alternating current quantity and the current alternating current quantity output by the relay protection tester (2) pass through the auxiliary equipment port and are applied to the relay protection device (1) to be tested through the equipment port on the side.
6. The surge test misoperation problem point locating system based on the relay protection device according to claim 1, wherein a coupling element is integrated in the surge coupling network (4); The surge signal generator (3) is used for outputting a surge interference signal, and the surge interference signal is coupled to a tested device port of the surge coupling network (4) through the coupling element by a high-voltage output port and a common reference port of the surge coupling network (4).
7. The surge test malfunction point positioning system based on a relay protection device according to claim 6, wherein the high voltage probe is used for collecting and attenuating the surge interference signal, and the high voltage probe is capable of performing equal proportion attenuation on the surge interference signal.
8. The surge test misoperation problem point location system based on the relay protection device according to claim 6, wherein the comparison test device comprises a standby alternating current module, a standby mother board module and a standby CPU module, and is used for replacing the corresponding original module in the relay protection device (1).
9. The surge test misoperation problem point positioning method based on the relay protection device is characterized by comprising the following steps of: Step S1, acquiring an output waveform of a surge signal generator (3) by adopting a high-voltage probe, checking whether the waveform meets the standard requirement, if so, constructing a surge test environment of a relay protection device (1), the surge signal generator (3) and a relay protection tester (2), and ensuring that the relay protection device (1), a switch (5) and a PC (6) are interconnected; step S2, replacing the corresponding original module in the relay protection device by using the standby alternating current module, the standby mother board module and the standby CPU module which are confirmed to be normal through testing in sequence, and executing a surge test after each replacement, wherein the executing the surge test comprises the following steps: if the surge misoperation problem is not repeated after the standby alternating current module is replaced, primarily judging that the problem point is positioned in the alternating current module (8); If the surge misoperation problem is not repeated after the standby motherboard module is replaced, primarily judging that the problem point is positioned on the motherboard module; if the surge misoperation problem is not repeated after the standby CPU module is replaced, primarily judging that the problem point is positioned on the CPU module; Step S3, if the surge misoperation problem is still repeated after all the modules in the step S2 are replaced once, primarily judging and judging that the surge misoperation problem is a systematic defect, and transferring the systematic defect into a hardware system for optimization analysis; And S4, if the problem of systematic defects is not solved after the hardware system optimization analysis of the step S3, optimizing a protection algorithm program in the relay protection device by a sampling software filtering algorithm to accurately identify and filter the surge interference signals.
10. The surge test malfunction point positioning method based on a relay protection device according to claim 9, wherein the preliminary judgment of the malfunction point is located in the ac module, comprising: The brand and model brand new voltage/current transformers are replaced for testing, if the surge misoperation problem disappears after replacement, the voltage/current transformers are judged to be individual defects, and the voltage/current transformers are analyzed; If false operation still occurs after replacement, the other brand compatible transformers are replaced for retesting, and if the problem of false operation of surge after replacement disappears, the voltage/current transformers with the brand, the same model and the same batch are judged to have performance defects; if the problem of surge misoperation after the replacement of the voltage/current transformer still exists, reserving a hole site for welding a corresponding protection device on the protection device of the alternating current module (8), and performing a comparison test.

Description

Surge test misoperation problem point positioning system and method based on relay protection device Technical Field The invention relates to a surge test misoperation problem point positioning system and method based on a relay protection device, and belongs to the technical field of relay protection electromagnetic compatibility tests. Background The relay protection device is used as a first defense line for safe operation of the power system, and the reliability of the relay protection device is directly related to the stability and the power supply safety of the power grid. However, in actual operation, the relay protection device often generates malfunction due to surge interference, resulting in unnecessary power failure accidents and economic losses. Therefore, in the current power system industry, the protection measures aiming at the surge interference cannot completely block or inhibit the interference of the surge on the product, the transient characteristic and the precision requirement of the alternating current sampling of the relay protection device are high, too many protection measures cannot be added, and the problem of surge misoperation still occurs easily. Disclosure of Invention The invention aims to provide a surge test misoperation problem point positioning system and method based on a relay protection device, which can solve the problem of quick positioning of the problem point when the relay protection device generates surge misoperation in an electromagnetic compatibility test, and analyze the misoperation problem at the first time to find out the problem point of the surge misoperation, so that a solution is determined for the problem point as soon as possible, the surge misoperation problem is repaired, and the problem is ensured not to be repeated. In order to solve the technical problems, the invention is realized by adopting the following technical scheme. In a first aspect, the present invention provides a surge test malfunction problem point positioning system based on a relay protection device, including: a surge coupling network; the relay protection tester is connected with an auxiliary equipment port of the surge coupling network and is used for outputting traffic; the relay protection device comprises a network port communication module, wherein the relay protection device is connected with a tested equipment port of the surge coupling network, and the alternating current quantity is applied to the tested relay protection device through the tested equipment port by the auxiliary equipment port; a surge signal generator connected with a high voltage output port, a common reference port and a protection ground port of the surge coupling network; the input end of the switch is connected with the network port communication module; the PC is connected with the output end of the switch; The high-voltage probe is used for collecting the surge signals output by the surge signal generator; And the comparison test device is used for replacing the module in the relay protection device in the positioning process and carrying out surge test. With reference to the first aspect, further, the relay protection device includes: the alternating current module comprises a voltage transformer and a current transformer and is used for converting alternating current quantity from the relay protection tester into alternating current quantity analog signals through the voltage transformer and the current transformer and collecting the alternating current quantity analog signals; the motherboard module is connected with the alternating current module and is used for transmitting the alternating current analog signal to the CPU module; The CPU module comprises an A/D conversion module, a field programmable gate array module, a CPU module and a network port communication module, wherein the A/D conversion module is used for converting the alternating current analog signal into a digital signal, the FPGA module is used for carrying out interpolation synchronous processing on the digital signal to obtain a sampling message, the CPU module is used for carrying out filtering processing on the sampling message to obtain noise-free and interference-free data and judging whether protection tripping operation is carried out or not based on the noise-free and interference-free data, and the network port communication module is used for sending the sampling message to the PC. With reference to the first aspect, further, the relay protection tester is configured to provide the current traffic and the voltage traffic for testing to the relay protection device. With reference to the first aspect, further, the output precision of the current alternating current is-0.001 a to 0.001a, and the output precision of the voltage alternating current is-0.001v to 0.001v. With reference to the first aspect, further, the high voltage output port, the common reference port and the protection ground port of the surge coup