Surge test maloperation problem point positioning system and method based on relay protection device

Abstract

The invention discloses a surge test maloperation problem point positioning system and method based on a relay protection device in the field of relay protection electromagnetic compatibility tests of a power system, and aims to solve the problem source which is difficult to quickly and systematically position when the relay protection device performs maloperation. The system comprises a surge coupling network, a relay protection tester, a relay protection device and a surge signal generator, and the relay protection tester is connected with an AE PORT port of the surge coupling network and used for outputting alternating current quantity; the relay protection device comprises a network port communication module; the relay protection device is connected with an EUT PORT port of the surge coupling network; wherein the alternating current quantity is applied to the tested relay protection device through the AE PORT port and the EUT PORT port; the surge signal generator is connected with the surge coupling network, the network port communication module is connected with the input end of the switch, and the output end of the switch is connected with the PC. According to the invention, rapid and accurate layered positioning of the surge test maloperation problem can be realized.

Description

Technical Field

[0001] This invention relates to a surge test malfunction problem location system and method based on relay protection devices, belonging to the field of electromagnetic compatibility testing technology for relay protection. Background Technology

[0002] As the "first line of defense" for the safe operation of the power system, the reliability of relay protection devices is directly related to the stability of the power grid and the security of power supply. However, in actual operation, relay protection devices often malfunction due to surge interference, leading to unnecessary power outages and economic losses.

[0003] Therefore, in the current power system industry, surge protection measures cannot completely block or suppress the interference caused by surges to products. Furthermore, the transient characteristics and accuracy requirements of AC sampling of relay protection devices are relatively high, so too many protective measures cannot be added, and surge maloperation problems are still likely to occur. Summary of the Invention

[0004] The purpose of this invention is to provide a surge test malfunction problem location system and method based on relay protection devices. When a surge malfunction occurs in an electromagnetic compatibility test, the system can quickly locate the problem point, analyze the malfunction problem at the first moment, find the problem point of the surge malfunction, determine a solution for the problem point as soon as possible, fix the surge malfunction problem, and ensure that the problem does not recur.

[0005] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution.

[0006] In a first aspect, the present invention provides a surge test malfunction problem location system based on a relay protection device, comprising: Surge coupling network; A relay protection tester, which is connected to the auxiliary equipment port of the surge coupling network, is used to output AC quantities; A relay protection device includes a network communication module, wherein the relay protection device is connected to the port of the device under test in the surge coupling network; wherein the AC quantity is applied to the relay protection device under test through the auxiliary device port and via the port of the device under test; A surge signal generator is connected to the high-voltage output port, common reference port, and protective ground port of the surge coupling network. A switch, the input of which is connected to the network port communication module; A PC is connected to the output of the switch; A high-voltage probe is used to collect the surge signal output by the surge signal generator; The comparative testing device is used to replace the modules inside the relay protection device during the positioning process and to perform surge testing.

[0007] In conjunction with the first aspect, the relay protection device further includes: An AC module, including a voltage transformer and a current transformer, is used to convert AC quantities from a relay protection tester into AC analog signals and acquire them through the voltage transformer and current transformer. The motherboard module is connected to the AC module and is used to transmit the AC analog signal to the CPU module; The CPU module includes an A / D conversion module, a field-programmable gate array (FPGA) module, a CPU module, and a network communication module. The A / D conversion module converts the AC analog signal into a digital signal. The FPGA module performs interpolation and synchronization processing on the digital signal to obtain a sampling message. The CPU module filters the sampling message to obtain noise-free and interference-free data, and determines whether to perform a protection trip operation based on the noise-free and interference-free data. The network communication module sends the sampling message to the PC.

[0008] In conjunction with the first aspect, the relay protection tester is further used to provide the relay protection device with AC current and AC voltage for testing.

[0009] In conjunction with the first aspect, the output accuracy of the AC current is -0.001A to 0.001A, and the output accuracy of the AC voltage is -0.001V to 0.001V.

[0010] In conjunction with the first aspect, the high-voltage output port, common reference port, and protective ground port of the surge coupling network are respectively connected to the high-voltage output port, common reference port, and protective ground port of the surge generator; The L, N, and PE ports of the device under test in the surge coupling network are connected to the L, N, and PE ports of the relay protection device; the L, N, and PE ports of the auxiliary device in the surge coupling network are connected to the L, N, and PE ports of the relay protection tester. The AC voltage and AC current output by the relay protection tester are applied to the relay protection device under test through the auxiliary equipment port and the device port on the side.

[0011] In conjunction with the first aspect, the surge coupling network further integrates coupling elements; The surge signal generator is used to output a surge interference signal, which is coupled to the port of the device under test of the surge coupling network via the high-voltage output port and common reference port of the surge coupling network through the coupling element.

[0012] In conjunction with the first aspect, the high-voltage probe is further used to collect and attenuate the surge interference signal, and the high-voltage probe can attenuate the surge interference signal proportionally.

[0013] In conjunction with the first aspect, the comparative test device further includes a spare AC module, a spare motherboard module, and a spare CPU module, used to replace the corresponding original module in the relay protection device.

[0014] Secondly, a method for locating the problem point of surge test malfunction based on relay protection devices includes: Step S1: Use a high-voltage probe to collect the output waveform of the surge signal generator and check whether the waveform meets the specification requirements. If the waveform meets the specification requirements, set up a surge test environment for the relay protection device, surge signal generator and relay protection tester, and ensure that the relay protection device, switch and PC are interconnected. Step S2: Replace the corresponding original modules in the relay protection device sequentially with the tested and confirmed normal spare AC module, spare motherboard module, and spare CPU module, and perform a surge test after each replacement. The surge test includes: If the surge tripping problem no longer recurs after replacing the spare AC module, it is preliminarily determined that the problem lies in the AC module. If the surge tripping problem no longer recurs after replacing the spare motherboard module, it is preliminarily determined that the problem lies in the motherboard module. If the surge tripping problem no longer recurs after replacing the spare CPU module, it is preliminarily determined that the problem lies in the CPU module. Step S3: If the surge malfunction problem still recurs after all modules in step S2 have been replaced, it is preliminarily determined that the surge malfunction problem is a systemic defect, and the process is transferred to hardware system optimization analysis. Step S4: If the systemic defect problem is still not resolved after the hardware system optimization analysis in step S3, the sampling software filtering algorithm optimizes the protection algorithm program in the relay protection device to accurately identify and filter out the surge interference signal.

[0015] In conjunction with the second aspect, further, the preliminary judgment that the problem lies in the communication module includes: Replace the voltage / current transformer with a brand new one of the same brand and model and test it. If the surge tripping problem disappears after replacement, it is determined to be an individual defect of the voltage / current transformer, and the voltage / current transformer is analyzed. If the malfunction persists after replacement, replace with a compatible transformer from another brand and test again. If the surge malfunction disappears after replacement, it is determined that the voltage / current transformer of this brand, model, and batch has a performance defect. If the surge tripping problem persists after the voltage / current transformer is replaced, the corresponding protective device is welded to the reserved hole of the protective device in the AC module and a comparative test is performed.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: This invention proposes a dedicated testing environment comprising a surge coupling network, a signal generator, a tester, and a data recording unit. This environment enables real-time data acquisition and monitoring of relay protection devices under surge interference. The system employs a comparative testing method combining modular insertion and step-by-step component replacement. This allows for rapid and accurate localization of malfunctions from the device system level down to specific faulty modules (such as AC modules, motherboard modules, or CPU modules), and further down to core components (such as voltage / current transformers, A / D conversion modules) or protection circuits, significantly improving the efficiency and accuracy of troubleshooting. Simultaneously, through switch isolation and PC waveform analysis, the system can completely preserve the trend of sampled data changes during testing, providing direct evidence for hardware optimization and software filtering algorithm improvement. This forms a closed-loop solution of "test-location-analysis-optimization," effectively shortening the R&D and rectification cycle and improving the reliability and stability of relay protection devices in complex electromagnetic environments. Attached Figure Description

[0017] Figure 1 The diagram shown is a structural layout of the rapid location system for surge testing malfunctions of AC modules in relay protection devices provided in an embodiment of the present invention. Figure 2 The flowchart shown is a method for rapidly locating the fault point of surge testing of AC module of relay protection device provided in an embodiment of the present invention. Figure 3 The diagram shows a flowchart of the AC module testing problem location method provided in an embodiment of the present invention; Figure 4 The diagram shows a flowchart of the motherboard module test problem point location method provided in an embodiment of the present invention; Figure 5 The diagram shows a flowchart of the CPU module testing problem location method provided in an embodiment of the present invention; In the diagram: 1. Relay protection device; 2. Relay protection tester; 3. Surge signal generator; 4. Surge coupling network; 5. Switch; 6. PC; 7. Network communication module; 8. AC module. Detailed Implementation

[0018] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations thereof. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other. Example 1

[0019] See Figure 1 This embodiment introduces a surge test malfunction problem location system based on a relay protection device, including a relay protection device 1, a relay protection tester 2, a surge signal generator 3, a surge coupling network 4, a switch 5, a PC 6, and a network communication module 7. Except for the connection between the relay protection device 1 under test and the switch 5, and between the PC 6 and the switch 5, which are connected via Ethernet twisted-pair cables, all other connections use standard EMC test cables.

[0020] The relay protection tester 2 is used to output AC quantities, that is, to provide the relay protection device 1 with AC current and AC voltage quantities for testing. In this embodiment of the invention, the accuracy range of the AC current and AC voltage quantities is -0.001A~0.001A and -0.001V~0.001V, respectively. In this embodiment of the invention, the accuracy of the AC current and AC voltage quantities is controlled at 0.001A and 0.001V.

[0021] The relay protection device 1 includes an AC module 8, a motherboard module, and a CPU module. The AC module 8 includes a voltage transformer and a current transformer, used to convert the AC quantities from the relay protection tester 2 into AC analog signals for acquisition. For example, if the relay protection tester 2 outputs a 100V voltage and a 1A current, the voltage transformer and current transformer will convert these into voltage signals that can be acquired by an AD chip from 0-5V.

[0022] The motherboard module is used to connect the various modules in the relay protection device 1, that is, the motherboard module is connected to the AC module 8 and the CPU module respectively, thereby transmitting the AC analog signal collected by the AC module 8 to the CPU module; the CPU module includes an A / D conversion module, an FPGA (Field Programmable Gate Array) module, a CPU module, and a network communication module 7. The A / D conversion module is used to convert the AC analog signal into a digital signal, and then send the converted digital signal to the FPGA and CPU modules for processing in sequence. The specific processing includes: In the FPGA module, the digital signal is interpolated and synchronized to obtain the sampling message; In the CPU module, the sampled messages are filtered to obtain noise-free and interference-free data, and the system determines whether to perform a protection trip operation based on the noise-free and interference-free data.

[0023] Finally, the network communication module 7 transmits the sampling message to the PC 6 in the form of a Layer 2 Ethernet packet.

[0024] The surge signal generator 3 is equipped with HV (high voltage output), COM (common reference), and PE (protective ground) ports. The surge signal generator 3 can generate a standard level 4 surge interference signal, which is applied to the relay protection device 1 under test through a 42Ω surge coupling network 4, thereby generating a standard-compliant surge interference signal. The surge coupling network 4 includes an AEPORT (auxiliary device) port, an EUT PORT (device under test) port, and HV, COM, and PE ports. The HV, COM, and PE ports of the surge coupling network 4 are respectively connected to the HV, COM, and PE ports of the surge generator. The L, N, and PE ports of the EUTPORT port of the surge coupling network 4 are respectively connected to the L, N, and PE ports of the relay protection device 1. The L, N, and PE ports of the AEPORT port of the surge coupling network 4 are respectively connected to the L, N, and PE ports of the power protection tester 2.

[0025] The AC voltage and AC current output by the relay protection tester 2 are applied to the relay protection device 1 under test via the EUT PORT port through the AE PORT port.

[0026] The surge coupling network 4 integrates coupling elements such as a 40Ω resistor and a 0.5μF capacitor. The surge signal generator 3 can output a surge interference signal, which enters through the HV and COM ports of the surge coupling network 4, is coupled to the EUT PORT port of the surge coupling network 4 through the 40Ω resistor and the 0.5μF capacitor, and is connected to the relay protection device 1 under test through the EUTPORT port.

[0027] The high-voltage probe is used to collect and attenuate the surge interference signal, and can attenuate it proportionally with an attenuation ratio of 1000:1, which is used to linearly convert the surge interference signal of up to 4000V into a 4V voltage signal that can be collected within the range of the oscilloscope.

[0028] To protect PC 6 from surge interference signals and ensure data accuracy, an optoelectronic switching module is integrated inside switch 5 to switch the direct connection between surge interference signals and PC 6. PC 6 includes a data receiving and processing module and a data storage module, used to process the interpolated and synchronized sampling message packets sent by the relay protection device 1 under test into waveform recordings and display them on the PC.

[0029] The comparative test device includes a test device that is compatible with the hardware module of the relay protection device 1 under test and is used to replace the corresponding original module inside it. The test range is specifically selected from one or more of the following: A spare AC module, spare motherboard module, and spare CPU module that are compatible with and functionally compatible with the relay protection device 1 under test are used to troubleshoot problems step by step. Compatible with current / voltage transformers used in AC module 8, for replacement testing of current / voltage transformers of this brand or other brands; Compatible with A / D conversion modules (A / D converters) used in CPU modules, for replacement testing of A / D conversion modules of this brand or other brands. Example 2

[0030] See Figure 2 A method for locating surge test malfunctions based on relay protection devices includes the following steps: Step S1: Use a high-voltage probe to collect the output waveform of the surge signal generator 3 and check whether the waveform meets the specification requirements. If the waveform meets the specification requirements, set up the surge test environment of the relay protection device 1, the surge signal generator 3 and the relay protection tester 2, and ensure that the relay protection device 1, the switch 5 and the PC 6 are interconnected. Specifically, during the setup process, it is necessary to ensure that standard test leads are used for wiring, the screws of the relay protection device 1 under test are tightened, and the temperature and humidity of the test environment meet the test requirements. Furthermore, the relay protection device 1 under test should not be moved during the test to avoid interference from other factors.

[0031] Step S2: Replace the corresponding original modules in the relay protection device sequentially with the tested and confirmed normal spare AC module, spare motherboard module, and spare CPU module, and perform a surge test after each replacement. See [link to relevant documentation] Figure 3 The process of performing a surge test includes: Step S21: If the surge tripping problem no longer recurs after replacing the spare AC module, the problem is preliminarily determined to be located in AC module 8, and the AC module 8 testing process is initiated. a. Replace with a brand new voltage / current transformer of the same brand and model and test. If the surge tripping problem disappears after replacement, it is determined to be an individual defect of the voltage / current transformer, and the voltage / current transformer is analyzed. b. If the surge tripping problem persists after replacement, replace with a compatible transformer from another brand and test again. If the tripping problem disappears after replacement, it is determined that the voltage / current transformer of this brand, model, and batch has a performance defect, and the manufacturer needs to be contacted for joint analysis. c. If the malfunction still exists after replacing the voltage / current transformer, the protection circuit should be optimized. Under the premise of ensuring that the sampling transient characteristics and accuracy of the device are not affected, the AC module 8 should be compared, analyzed and optimized. That is, the corresponding protection device should be welded to the reserved hole of the protection device in the AC module 8 and a comparative test should be performed.

[0032] Step S22: If the surge malfunction problem no longer recurs after replacing the spare motherboard module, it is preliminarily determined that the problem point is located in the motherboard module, and the motherboard module testing process is initiated. See Figure 4 The motherboard module testing process is as follows: a. Observe whether there is physical damage or loose parts in the motherboard module. If so, repair and retest. If there is no obvious physical abnormality, adjust the protective devices. b. If the problem of malfunction persists after adjustment, the motherboard module needs to be further optimized through comparative analysis.

[0033] Step S23: If the surge malfunction problem no longer recurs after replacing the spare CPU module, it is preliminarily determined that the problem lies in the CPU module, and the CPU module testing process is initiated. See Figure 5 The CPU module testing process is as follows: a. Replace with the same brand and model A / D converter module for testing; if the malfunction disappears after replacement, it is determined to be an individual defect of the A / D converter module, and the module is then analyzed; b. If the surge triggering problem persists after replacement, try replacing it with a compatible A / D converter module from another brand. If the surge triggering problem disappears after replacement, it is determined that the A / D converter module of this brand, model, and batch has a performance defect. You need to contact the manufacturer for joint analysis. c. If the malfunction still exists after completing the above replacement test, further comparative analysis is required to locate whether it is a system-level problem such as FPGA algorithm or data transmission, as shown in steps S3-S4 below.

[0034] Step S3: If the surge malfunction problem still recurs after all modules in step S2 have been replaced, it is preliminarily determined that the surge malfunction problem is a systemic defect, and the process is transferred to hardware system optimization analysis. Step S4: If the systemic defect problem is still not resolved after the hardware system optimization analysis in step S3, the sampling software filtering algorithm optimizes the protection algorithm program in the relay protection device to accurately identify and filter out the surge interference signal.

[0035] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A surge test malfunction problem location system based on relay protection devices, characterized in that, include: Surge coupling network (4); The relay protection tester (2) is connected to the auxiliary equipment port of the surge coupling network (4) and is used to output AC quantities; The relay protection device (1) includes a network communication module (7), and the relay protection device (1) is connected to the port of the device under test of the surge coupling network (4); wherein the AC quantity is applied to the relay protection device (1) under test through the auxiliary device port via the port of the device under test. A surge signal generator (3) is connected to the high voltage output port, common reference port, and protective ground port of the surge coupling network (4); The switch (5) has its input end connected to the network communication module (7); PC (6), which is connected to the output of the switch (5); A high-voltage probe is used to collect the surge signal output by the surge signal generator (3); The comparison test device is used to replace the module in the relay protection device (1) during the positioning process and to perform surge testing.

2. The surge test malfunction problem location system based on relay protection device according to claim 1, characterized in that, The relay protection device (1) includes: The AC module (8), including a voltage transformer and a current transformer, is used to convert the AC quantity from the relay protection tester (2) into an AC analog signal and perform AC signal processing via the voltage transformer and current transformer. The motherboard module is connected to the AC module (8) and is used to transmit the AC analog signal to the CPU module; The CPU module includes an A / D conversion module, a field-programmable gate array (FPGA) module, a CPU module, and a network communication module (7). The A / D conversion module is used to convert the AC analog signal into a digital signal. The FPGA module is used to perform interpolation and synchronization processing on the digital signal to obtain a sampling message. The CPU module is used to filter the sampling message to obtain noise-free and interference-free data, and to determine whether to perform a protection trip operation based on the noise-free and interference-free data. The network communication module (7) is used to send the sampling message to the PC (6).

3. The surge test malfunction problem location system based on relay protection device according to claim 1, characterized in that, The relay protection tester (2) is used to provide the relay protection device (1) with AC current and AC voltage for testing.

4. The surge test malfunction problem location system based on relay protection device according to claim 3, characterized in that, The output accuracy of the AC current is -0.001A to 0.001A, and the output accuracy of the AC voltage is -0.001V to 0.001V.

5. The surge test malfunction problem location system based on relay protection device according to claim 4, characterized in that, The high voltage output port, common reference port, and protective ground port of the surge coupling network (4) are respectively connected to the high voltage output port, common reference port, and protective ground port of the surge generator (3); The L, N, and PE ports of the device under test in the surge coupling network (4) are connected to the L, N, and PE ports of the relay protection device (1). The L, N, and PE ports of the auxiliary equipment port of the surge coupling network (4) are connected to the L, N, and PE ports of the relay protection tester (2). The voltage AC quantity and current AC quantity output by the relay protection tester (2) are applied to the relay protection device (1) under test through the auxiliary equipment port via the side equipment port.

6. The surge test malfunction problem location system based on relay protection device according to claim 1, characterized in that, The surge coupling network (4) has an integrated coupling element inside; The surge signal generator (3) is used to output a surge interference signal. The surge interference signal is coupled to the port of the device under test of the surge coupling network (4) via the high voltage output port and common reference port of the surge coupling network (4) through the coupling element.

7. The surge test malfunction problem location system based on relay protection device according to claim 6, characterized in that, The high-voltage probe is used to collect and attenuate the surge interference signal, and the high-voltage probe can attenuate the surge interference signal proportionally.

8. The surge test malfunction problem location system based on relay protection device according to claim 6, characterized in that, The comparative test device includes a spare AC module, a spare motherboard module and a spare CPU module, which are used to replace the corresponding original module in the relay protection device (1).

9. A method for locating the problem point of surge test malfunction based on relay protection device, characterized in that, include: Step S1: Use a high-voltage probe to collect the output waveform of the surge signal generator (3) and check whether the waveform meets the specifications. If the waveform meets the specifications, then build a surge test environment for the relay protection device (1), the surge signal generator (3) and the relay protection tester (2), and ensure that the relay protection device (1), the switch (5) and the PC (6) are interconnected. Step S2: Replace the corresponding original modules in the relay protection device sequentially with the tested and confirmed normal spare AC module, spare motherboard module, and spare CPU module, and perform a surge test after each replacement. The surge test includes: If the surge tripping problem does not recur after replacing the spare AC module, it is preliminarily determined that the problem is located in the AC module (8). If the surge tripping problem no longer recurs after replacing the spare motherboard module, it is preliminarily determined that the problem lies in the motherboard module. If the surge tripping problem no longer recurs after replacing the spare CPU module, it is preliminarily determined that the problem lies in the CPU module. Step S3: If the surge malfunction problem still recurs after all modules in step S2 have been replaced, it is preliminarily determined that the surge malfunction problem is a systemic defect, and the process is transferred to hardware system optimization analysis. Step S4: If the systemic defect problem is still not resolved after the hardware system optimization analysis in step S3, the sampling software filtering algorithm optimizes the protection algorithm program in the relay protection device to accurately identify and filter out the surge interference signal.

10. The method for locating the faulty point of surge testing based on a relay protection device according to claim 9, characterized in that, The preliminary assessment indicates that the problem lies in the communication module, including: Replace the voltage / current transformer with a brand new one of the same brand and model and test it. If the surge tripping problem disappears after replacement, it is determined to be an individual defect of the voltage / current transformer, and the voltage / current transformer is analyzed. If the malfunction persists after replacement, replace with a compatible transformer from another brand and test again. If the surge malfunction disappears after replacement, it is determined that the voltage / current transformer of this brand, model, and batch has a performance defect. If the surge tripping problem still exists after the voltage / current transformer is replaced, the corresponding protective device is welded to the reserved hole of the protective device in the AC module (8) and a comparative test is performed.

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