Lightning arrester on-line monitoring meter verification system and method

Abstract

The invention discloses an automatic verification system and method for an on-line monitoring meter of a lightning arrester, and the system comprises a communication gateway, a control host, and a signal source, and the communication gateway is used for building a data communication link with the on-line monitoring meter of the lightning arrester; the control host is used for remotely configuring parameters of an adjustable test signal for representing the operation state of the lightning arrester after the communication link is established; the signal source is used for generating current and voltage test signals and applying the current and voltage test signals to the on-line monitoring meter of the lightning arrester to be tested; the control host is further configured to obtain response data of the on-line monitoring meter of the measured lightning arrester through the communication gateway, and compare the response data with a standard reference value in real time to generate a verification report. According to the automatic verification system of the lightning arrester on-line monitoring meter, through integration of the above modules, automatic identification, real working condition simulation and full-process automatic verification of the multi-protocol lightning arrester on-line monitoring meter are realized, and technical support is provided for reliability of monitoring data.

Description

Technical Field

[0001] This application relates to the field of power system monitoring technology, specifically to a calibration system and method for online monitoring meters of surge arresters. Background Technology

[0002] With the continuous advancement of intelligent transformation of substations, online monitoring meters for surge arresters have been widely used in power systems, becoming an important foundation for condition monitoring and intelligent operation and maintenance. However, the practical application of this technology still faces a series of severe challenges, which restrict the full realization of its effectiveness.

[0003] Currently, due to the different hardware solutions and communication protocols adopted by various equipment manufacturers, the models of online surge arrester monitoring meters are numerous and the system compatibility is poor. This situation makes it difficult to conduct effective live-line testing on some online surge arrester monitoring meters after installation. Field operation data shows significant differences in three-phase measurement results, with insufficient consistency and reliability, posing a substantial obstacle to operation and maintenance assessment.

[0004] Further testing and comparison revealed a significant discrepancy between the data reported by the online monitoring meters of surge arresters and the results of synchronous measurements using high-precision testing instruments. This discrepancy exposes potential vulnerabilities in the initial accuracy and long-term operational stability of the online monitoring meters, necessitating systematic verification and effective management of the reliability of their monitoring data.

[0005] Furthermore, during long-term continuous operation, the internal electronic components of surge arrester online monitoring meters may gradually decrease in monitoring accuracy due to aging, performance degradation, or damage. Such performance deterioration may trigger false alarms, disrupt normal operation and maintenance, or lead to the omission of actual defects, preventing the timely identification of potential hazards. This seriously affects the accurate assessment of the surge arrester's operating status and poses a potential risk to the safe operation of the power grid.

[0006] The aforementioned problems collectively highlight the shortcomings of existing technical means in terms of the universality, automation, and comprehensiveness of online monitoring and meter verification for surge arresters. There is an urgent need for an innovative solution that can adapt to multi-protocol access, achieve full-process automatic verification, and possess comprehensive evaluation capabilities. Summary of the Invention

[0007] The technical problem to be solved by this application is to provide a verification system for online monitoring meters of surge arresters, which solves the technical problems of existing online monitoring meter verification methods, such as poor reliability due to the diversity of protocols, low efficiency due to reliance on manual operation, and incomplete verification due to the difficulty in simulating real working conditions.

[0008] This application is achieved through the following technical solution:

[0009] Firstly, this application provides a calibration system for online monitoring meters of surge arresters, comprising:

[0010] A communication gateway is used to automatically identify and adapt to online monitoring meters of surge arresters with different communication protocols in order to establish a data communication link with the online monitoring meters of surge arresters.

[0011] The control host, integrated with the communication gateway, is used to remotely configure the parameters of the adjustable test signal used to characterize the operating status of the surge arrester after the communication link is established.

[0012] A signal source, connected to the control host, is used to generate current and voltage test signals according to the configured parameters and apply them to the online monitoring meters of the surge arrester under test.

[0013] The control host is further configured to acquire the response data of the online monitoring meter of the surge arrester under test to the test signal through the communication gateway, compare the response data with the standard reference value in real time, and automatically generate a verification report based on the built-in compliance criteria. A further optimization is that the signal source is an AC power source with an output accuracy better than a preset accuracy threshold.

[0014] A further optimization is that the signal source has a harmonic injection function, which can output a composite waveform test signal containing harmonic components of a specific order.

[0015] A further optimization is that the communication gateway supports standard industrial protocols based on serial communication and specific IoT protocols based on wireless transmission.

[0016] A further optimization scheme is to set different allowable error thresholds for the total current parameter and resistive current parameter in the surge arrester monitoring, respectively, based on the built-in compliance criteria.

[0017] A further optimization scheme is that the phase relationship between the current signal and the voltage signal output by the signal source can be set to a typical phase difference that simulates the actual power grid operation scenario.

[0018] Secondly, this application provides a method for verifying online monitoring meters for surge arresters, using the verification system for online monitoring meters of surge arresters as described above. The method includes the following steps:

[0019] Establish a communication connection between the control host, the signal source, and the communication gateway;

[0020] Test parameters are set on the control host and sent to the signal source;

[0021] The signal source is controlled to output a test signal, and the measurement data of the online monitoring meter of the surge arrester under test is collected through the communication gateway.

[0022] The collected measurement data is compared and analyzed with the standard reference values, and a verification conclusion is automatically generated based on the compliance criteria.

[0023] A further optimized solution includes the following steps before establishing the communication connection between the control host, the signal source, and the communication gateway:

[0024] The communication gateway automatically detects and negotiates with the online monitoring meter of the surge arrester under test to establish a communication connection.

[0025] A further optimization scheme is to set the phase parameter in the test parameter settings to simulate the typical phase relationship between the leakage current and the bus voltage of the surge arrester under normal operating conditions.

[0026] A further optimization scheme is that, in the step of comparing and analyzing the collected measurement data with the standard reference value, for online monitoring meters of surge arresters that do not support direct output of resistive current, their monitoring performance is indirectly evaluated by analyzing their harmonic measurement results.

[0027] Compared with the prior art, this application has the following advantages and beneficial effects:

[0028] An automated verification system was built by integrating a signal source, a control host, and a communication gateway. This system automates and intelligently operates the verification process: the communication gateway can automatically identify and adapt to multiple communication protocols, solving the problem of connecting online monitoring meters for surge arresters due to protocol differences, and supporting compatibility testing for equipment from different manufacturers and models.

[0029] The control host can remotely control standard signal sources, flexibly adjust parameters such as amplitude, phase and frequency of output signals, simulate various actual operating conditions, and provide near-realistic test conditions for a comprehensive evaluation of the performance of online monitoring meters of surge arresters.

[0030] By automatically collecting the response data of the online monitoring meters of the surge arrester and comparing and analyzing them with the standard reference values ​​in real time, and generating verification conclusions based on preset criteria, the errors that may be introduced in the traditional manual operation mode are reduced, and the standardization of the verification process and the consistency of the results are improved.

[0031] It helps improve the accuracy and efficiency of online monitoring meter calibration for surge arresters, expands the calibration coverage, and provides technical support for the reliability of monitoring data. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the exemplary embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0033] Figure 1 Functional block diagram of the calibration system for online monitoring meters of surge arresters provided in the embodiments of this application;

[0034] Figure 2 This is a schematic diagram of the automated calibration system for online monitoring meters of surge arresters, which is provided as an embodiment of this application. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this application are only for explaining this application and are not intended to limit this application.

[0036] This application provides a verification system and method for online monitoring meters of surge arresters, aiming to solve technical problems such as poor verification compatibility due to the large number of online monitoring meter manufacturers and different protocols, low efficiency due to reliance on manual labor, and difficulty in simulating real working conditions for comprehensive evaluation.

[0037] Firstly, such as Figure 1-2 As shown, this application provides a verification system for online monitoring meters of surge arresters, including the following modules:

[0038] Communication gateway 10 is used to automatically identify and adapt to online monitoring meters of surge arresters with different communication protocols in order to establish a data communication link with the online monitoring meters of surge arresters;

[0039] The control host 20, integrated with the communication gateway 10, is used to remotely configure the parameters of the adjustable test signal used to characterize the operating status of the surge arrester after the communication link is established.

[0040] Signal source 30, connected to the control host 20, is used to generate current and voltage test signals according to the configured parameters and apply them to the online monitoring meters of the surge arrester under test. The programmable nature of the signal source 30 means that its output parameters can be remotely controlled and flexibly set via software commands. Specifically, the signal source 30 is a high-precision single-phase AC current / voltage source. All its key output parameters, including current value, voltage value, phase, frequency, and harmonic content, can be precisely set and adjusted remotely by the control host 20 via a communication interface (such as RS485 or RS232), without requiring manual operation on the device panel.

[0041] The control host 20 is also configured to acquire the response data of the online monitoring meter of the surge arrester under test to the test signal through the communication gateway 10, compare the response data with the standard reference value in real time, and automatically generate a verification report based on the built-in compliance criteria.

[0042] This embodiment uses signal source 30 to simulate the current, voltage, and phase relationships of a surge arrester during actual operation. The system can automatically and accurately acquire the measured values ​​of the online monitoring meters of the surge arrester under test and compare them with the "standard reference values" output by signal source 30. This not only achieves quantitative verification of the accuracy of the total current and resistive current measurements of the online monitoring meters of the surge arrester, but also evaluates its harmonic analysis capability, thereby comprehensively verifying the accuracy and reliability of the online monitoring meters of the surge arrester. It effectively solves problems such as inaccurate monitoring data and false alarms caused by equipment aging and different models, providing a reliable basis for judging the operating status of the surge arrester.

[0043] In this application, the online monitoring meter for the surge arrester under test must meet the standard surge arrester online monitoring meter protocol issued by the Electric Power Research Institute or the standard MODBUS_RTU protocol for RS485 communication. There are various transmission protocols for surge arrester online monitoring meters on the market, making it difficult to meet the access and testing requirements of all protocols. This project conducts access testing on the surge arrester online monitoring meters that meet the most widely used and State Grid recommended protocols. The protocols that the access meets are shown in Table 1:

[0044] Table 1. Protocols that must be met for connecting online monitoring meters of surge arresters under test.

[0045]

[0046] In one embodiment, the communication gateway 10 serves as a protocol conversion hub connecting the online monitoring meter of the surge arrester under test (SAT) to the control host 20. Its core function is to automatically identify and adapt devices with different communication protocols to establish a stable data communication link. Specifically, the gateway supports the standard Modbus-RTU protocol based on serial communication (such as an RS485 interface), as well as the digital remote transmission online monitoring meter communication protocol for surge arresters published by the China Electric Power Research Institute (CEPRI) based on wired or wireless transmission. By design, the online monitoring meter of the surge arrester under test must meet one of the above protocols to successfully connect. This aims to solve the problem of connection and compatibility of online monitoring meters for surge arresters caused by numerous manufacturers and different protocols, providing a unified and standardized data source for subsequent automated verification.

[0047] The communication gateway 10 provided in this embodiment solves the problem of diverse communication protocols for online monitoring meters of surge arresters, realizing unified collection and uploading of data from heterogeneous devices, and providing a stable and standardized data source for the system host to perform data parsing and comparison. It is a key component in ensuring that the verification system can test mainstream online monitoring meters of surge arresters on the market.

[0048] In one embodiment, the control host 20 is the core control and data processing unit of the verification system. Specifically, the experimenter logs into the control host 20 to configure relevant information (such as communication parameters) of the online monitoring meters of the surge arrester under test, and remotely sets parameters such as current, voltage, phase, and harmonics of the signal source 30. After the settings are completed, the host controls the signal source 30 to start the corresponding channel and output a signal. Preferably, the host can automatically receive and parse the online monitoring meter data of the surge arrester under test uploaded by the communication gateway 10, and then automatically compare the online monitoring meter data of the surge arrester with the preset output "standard reference value" of the signal source 30, and give a judgment on whether it is qualified according to industry standards (such as the full current qualified range ±2% ±5uA, resistive current qualified range ±5% ±2uA).

[0049] The control host 20 includes processing hardware and dedicated testing software running on it. This testing software was developed specifically for the project and mainly performs three core functions: automatic detection and control of the signal source 30, automatic reception of data uploaded by the surge arrester, and automatic determination of whether the measurement data accuracy of the online monitoring meters of the surge arrester meets the requirements based on preset standards.

[0050] The control host 20 provided in this embodiment automates and automates the testing process, reducing human error. Its powerful data processing and comparison capabilities make the verification process fast and objective, and can directly output clear verification results, greatly improving the efficiency and reliability of the verification work.

[0051] In one embodiment, the signal source 30 is a high-precision AC power source, whose output signal amplitude and phase accuracy are superior to conventional industrial standards. Specifically, the power supply accuracy of the signal source 30 (such as the JH1060A type mentioned in the document) is 0.5%, and the magnitude, phase, and frequency of its output current and voltage values ​​can be precisely set according to test requirements. It provides the AC current and voltage signals required for testing, wherein the AC current and voltage signals are used to test the full current measurement unit of the surge arrester online monitoring meter, and the AC voltage signal is used to test the bus voltage monitoring unit of the surge arrester. Preferably, the phase adjustment range of the signal source 30 can reach 0°~359.999°, with an adjustment fineness of 0.001°, which can accurately simulate the working condition where the full current phase leads the bus voltage phase by about 80° during normal operation, and can be used for focused testing near this critical point. At the same time, it has the capability of outputting 2nd-51st harmonics, with a harmonic range of 0~40%, which can be used to verify the accuracy of harmonic analysis of the surge arrester online monitoring meter.

[0052] The signal source 30 provided in this embodiment serves as a reference for the test signal. Its high precision and programmability ensure the accuracy and repeatability of the test conditions. By flexibly setting the signal parameters (including the fundamental frequency and harmonics), it can comprehensively cover various working scenarios of online monitoring meters for surge arresters, providing a reliable standard reference for accuracy verification.

[0053] Signal source 30 is a high-precision single-phase AC current / voltage source with a power supply accuracy of 0.5%. The magnitude, phase, and frequency of the current and voltage values ​​can be set according to requirements. Signal source 30 settings can be manually configured via the panel or remotely controlled. Signal source 30 inputs test signals to the online monitoring meters of the surge arrester under test. Signal source 30 provides test signals for testing the online monitoring meters of the surge arrester; the test signals are divided into AC current and AC voltage. The AC current and voltage test signals are used for the total current measurement of the online monitoring meters of the surge arrester, while the AC voltage test is used for the test voltage input to the surge arrester monitoring bus voltage monitoring unit. The amplitude and phase of the test current and voltage signals provided by signal source 30 are settable and can be used to check whether the accuracy of current, total current, resistive current, and harmonic measurements of the online monitoring meters of the surge arrester meets the requirements. During actual normal operation in the field, the phase of the total current leads the phase of the bus voltage by approximately 80˚; it is recommended to test near this location whenever possible. This technical solution uses the JH1060A single-phase standard power source, and its signal source 30 technical specifications are shown in Table 2.

[0054] Table 2 Signal Source Technical Specifications

[0055]

[0056] The surge arrester online monitoring meter calibration system provided in this application mainly verifies three key parameters reflecting the operating status of the surge arrester: the number of lightning strikes, total current, and resistive current. It should be noted that different manufacturers' surge arrester online monitoring meters may only support monitoring some or all of the above parameters, and the scope of this calibration does not include monitoring the number of surge arrester operations.

[0057] The system employs differentiated calibration strategies based on the different characteristics of key measurands, such as total current, resistive current, and harmonic components.

[0058] Full current detection: The signal source 30 inputs constant current measurement signals to the online monitoring meter of the surge arrester under test, and the control host 20 receives the corresponding parameter signals output by the online monitoring meter of the surge arrester and compares and judges them. The industry standard and relevant State Grid specifications stipulate that the full current qualified range is: ±2% ±5uA.

[0059] Resistive current detection: A constant current measurement signal is input to the online monitoring meter of the surge arrester under test using a signal source 30, while a voltage signal is simultaneously input to the bus voltage acquisition device. The phase angle of the output current and voltage signals can be set. The control host 20 receives the corresponding parameter signals output by the online monitoring meter of the surge arrester and performs comparison and judgment. The industry standard specifies that the acceptable range for resistive current is ±5% ±2uA.

[0060] Harmonic Current Detection: Since some surge arrester online monitoring meters lack bus voltage acquisition devices, they cannot provide resistive current data, but harmonic analysis was performed (harmonic analysis can also reflect resistive current trends). This experimental platform added measurements of the 3rd and 5th harmonic parameters to verify the accuracy of harmonic analysis in the surge arrester online monitoring meters. A constant current measurement signal containing harmonics was input to the surge arrester online monitoring meter using signal source 30. The control host 20 received the corresponding parameter signals output by the surge arrester online monitoring meter and compared them. The acceptable range should refer to the requirements for harmonic measurement accuracy in relevant standards (e.g., harmonic content rate error limits).

[0061] The automated verification process for online monitoring meters of surge arresters provided in this application is as follows. Please follow these steps:

[0062] Step 1: The experimenter first reviews the technical data of the online monitoring meter of the surge arrester under test, clarifies its power-on operating conditions, measurement range, communication method and communication protocol, and verifies whether its protocol meets the testing standard requirements of this system.

[0063] Step 2: Correctly connect the surge arrester online monitoring meter that meets the communication protocol requirements to the experimental platform. Specifically, connect the current measurement unit of the surge arrester online monitoring meter to the constant current output channel of the standard signal source 30; if the surge arrester online monitoring meter is equipped with a bus voltage acquisition device, connect it to the voltage signal output terminal of the standard signal source 30 (if this device is not available, this connection can be omitted).

[0064] Step 3: The experimenter logs into the control host 20 and configures the communication parameters and other related settings of the connected online monitoring meters for surge arresters to ensure that the host can correctly identify, receive, and parse the data uploaded by the online monitoring meters for surge arresters.

[0065] Step 4: On the control host 20, the operator sets the output parameters of the standard signal source 30 according to the verification requirements, including current amplitude, voltage amplitude, phase, harmonic content, etc. After the parameters are set, the corresponding output channel of the signal source 30 is remotely activated through the host to apply a precise test signal to the online monitoring meter of the surge arrester under test.

[0066] Step 5: While the standard signal source 30 outputs the test signal, the control host 20 will automatically receive the response signal of the online monitoring meter of the surge arrester through the communication gateway 10, and use the built-in algorithm to analyze the received raw data in real time to extract the physical quantities to be verified (such as total current, resistive current, etc.).

[0067] Step Six: The control host 20 compares the parsed measurement data from the online monitoring meters of the surge arrester with the theoretical output value (i.e., the standard reference value) set by the standard signal source 30 in real time. The comparison process is based on the built-in compliance criteria (such as the qualified threshold of the recommended range of the State Grid digital remote transmission surge arrester online monitoring meters) and automatically generates a "qualified" or "unqualified" verification conclusion.

[0068] Step 7: After the experimenter confirms that the test is completed, he must first operate on the control host 20 to shut down the output channel of the standard signal source 30 and ensure that the test signal stops being output. Only then can the online monitoring meter of the surge arrester under test be safely removed.

[0069] This embodiment uses the standardized automatic verification process described above to compare the measurement data of the online monitoring meter of the surge arrester with the output value of the high-precision signal source 30, thereby effectively verifying the measurement accuracy and long-term operational reliability of the online monitoring meter of the surge arrester.

[0070] Thirdly, embodiments of this application provide a calibration device for an online monitoring meter of a surge arrester. The calibration device for the online monitoring meter of a surge arrester can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0071] In this embodiment of the application, the calibration device for the online monitoring meter of the surge arrester may include a processor, a memory, a communication interface, and a communication bus.

[0072] The communication bus can be of any type and is used to interconnect the processor, memory, and communication interface.

[0073] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces used for interconnecting internal components of the calibration equipment for online surge arrester monitoring meters, as well as interfaces used for interconnecting the calibration equipment for online surge arrester monitoring meters with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0074] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0075] The processor can be a general-purpose processor, which can call the verification program for the online monitoring meter of the surge arrester stored in the memory and execute the verification method for the online monitoring meter of the surge arrester provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the verification program for the online monitoring meter of the surge arrester is called can refer to the various embodiments of the verification method for the online monitoring meter of the surge arrester in this application, and will not be repeated here.

[0076] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above description is only a specific embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A calibration system for online monitoring meters of surge arresters, characterized in that, include: A communication gateway is used to automatically identify and adapt to online monitoring meters of surge arresters with different communication protocols in order to establish a data communication link with the online monitoring meters of surge arresters. The control host, integrated with the communication gateway, is used to remotely configure the parameters of the adjustable test signal used to characterize the operating status of the surge arrester after the communication link is established. A signal source, connected to the control host, is used to generate current and voltage test signals according to the configured parameters and apply them to the online monitoring meters of the surge arrester under test. The control host is also configured to acquire the response data of the online monitoring meter of the surge arrester under test to the test signal through the communication gateway, compare the response data with the standard reference value in real time, and automatically generate a verification report based on the built-in compliance criteria.

2. The calibration system for online monitoring meters of surge arresters according to claim 1, characterized in that, The signal source is an AC power source with an output accuracy better than a preset accuracy threshold.

3. The calibration system for online monitoring meters of surge arresters according to claim 2, characterized in that, The signal source has a harmonic injection function and can output a composite waveform test signal containing harmonic components of a specific order.

4. The calibration system for online monitoring meters of surge arresters according to claim 1, characterized in that, The communication gateway supports standard industrial protocols based on serial communication and specific IoT protocols based on wireless transmission.

5. The calibration system for online monitoring meters of surge arresters according to claim 1, characterized in that, The built-in compliance criteria set different permissible error thresholds for the total current parameter and resistive current parameter in surge arrester monitoring.

6. The calibration system for online monitoring meters of surge arresters according to claim 1, characterized in that, The phase relationship between the current signal and the voltage signal output by the signal source can be set to a typical phase difference that simulates the actual power grid operation scenario.

7. A method for verifying online monitoring meters for surge arresters, characterized in that, The calibration system for online monitoring meters of surge arresters as described in any one of claims 1 to 6, the method comprising the following steps: Establish a communication connection between the control host, the signal source, and the communication gateway; Test parameters are set on the control host and sent to the signal source; The signal source is controlled to output a test signal, and the measurement data of the online monitoring meter of the surge arrester under test is collected through the communication gateway. The collected measurement data is compared and analyzed with the standard reference values, and a verification conclusion is automatically generated based on the compliance criteria.

8. The verification method for online monitoring meters of surge arresters according to claim 7, characterized in that, Before the step of establishing the communication connection between the control host, the signal source, and the communication gateway, the following steps are also included: The communication gateway automatically detects and negotiates with the online monitoring meter of the surge arrester under test to establish a communication connection.

9. The verification method for online monitoring meters of surge arresters according to claim 7, characterized in that, The phase parameter set in the test settings is used to simulate the typical phase relationship between the leakage current and the bus voltage of the surge arrester under normal operating conditions.

10. The verification method for online monitoring meters of surge arresters according to claim 7, characterized in that, In the step of comparing and analyzing the collected measurement data with the standard reference value, for online monitoring meters of surge arresters that do not support direct output of resistive current, their monitoring performance is indirectly evaluated by analyzing their harmonic measurement results.

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