Intelligent early warning system for operation safety of high-voltage lightning arrester

Abstract

The invention relates to the field of lightning arrester operation state monitoring, in particular to an intelligent early warning system for operation safety of a high-voltage lightning arrester. The system aims to solve the problems that the running state of the existing high-voltage lightning arrester is in a black box state due to poor monitoring, deep processing and analysis of monitoring data are lacked, and the health state of the lightning arrester cannot be observed from the overall perspective of all data. The system comprises a data acquisition module, a lightning arrester state monitoring device, a communication unit and a background workstation. Data are acquired through the data acquisition module and transmitted to the lightning arrester state monitoring device for processing, then the data are transmitted to the background work station through the communication unit, and the background work station evaluates the operation state of the lightning arrester and the damage degree after lightning stroke through comprehensive research and analysis on the transmitted information. And the lightning arresters which do not meet the operation requirements are alarmed in time to remind operation and maintenance personnel to repair and maintain in time.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of monitoring the operation state of lightning arresters, and particularly relates to a high-voltage lightning arrester operation safety intelligent early warning system. BACKGROUND

[0002] With the rapid development of power systems towards high voltage and long distance transmission, the complexity and vulnerability of power networks are increasingly highlighted. Although high-voltage lightning arresters play a key role in lightning protection and overvoltage suppression, their own operating conditions often fall into a "black box" state due to inadequate monitoring. At the same time, the traditional monitoring mode has many drawbacks:

[0003] (1) Single monitoring parameter; most rely only on leakage current, but at the initial stage of lightning arrester damage, the leakage current changes slightly, and it is difficult to detect hidden dangers by rough monitoring, which may lead to the development of faults to a serious stage before being discovered.

[0004] (2) Outdated monitoring means; the common method is to combine manual inspection with simple instrument measurement during periodic power-off maintenance, which has poor timeliness. On the one hand, manual inspection has a long interval and is difficult to capture transient abnormalities before a sudden failure; on the other hand, there is a large difference between the state of the lightning arrester during power-off and during work, and the data reliability is low, which cannot provide accurate basis for fault diagnosis.

[0005] (3) Lack of systematic analysis; isolated monitoring of each parameter, without establishing an organic connection between parameters, lacking depth processing and analysis of monitoring data, and unable to understand the health status of lightning arresters from the overall perspective of each data, ignoring the diversity and complexity of lightning arrester operating state, which is difficult to discover in time, and further causes chain reactions such as local overheating and discharge, eventually leading to power system accidents, causing immeasurable losses to the society and economy. SUMMARY

[0006] In view of the deficiencies of the prior art, the purpose of the present application is to provide a high-voltage lightning arrester operation safety intelligent early warning system, which realizes systematic and accurate judgment of the operating state of lightning arresters.

[0007] To achieve the above purpose, the technical solution provided by the present application is as follows.

[0008] The application discloses a high-voltage lightning arrester operation safety intelligent early warning system, which comprises a data acquisition module, a lightning arrester state monitoring device, a communication unit and a background workstation. Relevant information acquired through the data acquisition module is transmitted to the lightning arrester state monitoring device, and the lightning arrester state monitoring device further obtains detailed information of leakage current, resistive current, capacitive current, phase angle and lightning current related parameters when lightning occurs of each lightning arrester through operation analysis and processing. Each interval contains three lightning arrester state monitoring devices, the three lightning arrester state monitoring devices are in parallel transmission to the interval containing the communication unit in the form of RS-485 communication, the communication unit preliminarily integrates and converts the received information, and then transmits the information to the background workstation through optical fiber communication through the photoelectric conversion device, the background workstation evaluates the operation state of the lightning arrester and the damage degree after lightning through comprehensive research and analysis of the transmission information, and timely alarms the lightning arrester which does not meet the operation requirements, reminding the operation and maintenance personnel to timely repair and maintain.

[0009] Specifically, the following steps are included:

[0010] S1, data acquisition: used for acquiring operation parameters of the high-voltage lightning arrester, wherein the operation parameters include leakage current, resistive current, capacitive current, PT voltage, phase angle, lightning frequency and lightning related parameters after suffering lightning;

[0011] S2, data analysis: the lightning arrester state monitoring device further obtains detailed information of leakage current, resistive current, capacitive current, phase angle and lightning current related parameters when lightning occurs of each lightning arrester through operation analysis and processing after receiving the data transmitted by S1;

[0012] S3, data transmission and conversion: the communication unit integrates the data transmitted by S2, and converts the integrated data into optical signals through the photoelectric conversion device for transmission;

[0013] S4, background evaluation: the background workstation converts the data transmitted by S3 from optical signals into electric signals, comprehensively analyzes, evaluates and diagnoses the received signals, and integrally displays the operation state and parameters of the monitored lightning arrester in the form of a system picture, and timely pop-up alarms when the lightning arrester has an abnormal fault state.

[0014] Compared with the prior art, the application has the following beneficial effects:

[0015] The application has the beneficial effects of monitoring the operation state of the high-voltage lightning arrester, capturing lightning, evaluating damage, and early warning faults, improving the operation safety and service life of the lightning arrester, reducing operation and maintenance costs, and improving the operation reliability and intelligent level of the power system through comprehensive monitoring, capturing, evaluation and early warning. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a high-voltage arrester operation safety intelligent early warning system block diagram of the present application;

[0017] Figure 2 is a high-voltage arrester operation safety intelligent early warning system working process schematic diagram of the present application;

[0018] Figure 3 is a high-voltage arrester operation safety intelligent early warning system data acquisition module principle block diagram of the present application;

[0019] Figure 4 is a high-voltage arrester operation safety intelligent early warning system data acquisition module installation position schematic diagram of the present application. DETAILED DESCRIPTION

[0020] The application will be further described below in conjunction with specific embodiments, but the embodiments of the present application include but are not limited to the scope represented by the following examples.

[0021] EMBODIMENT

[0022] As shown in the embodiment, a high-voltage arrester operation safety intelligent early warning system block diagram is provided. Figure 1

[0023] A high-voltage arrester operation safety intelligent early warning system, comprising a data acquisition module, an arrester state monitoring device, a communication unit, and a background workstation; the relevant information obtained by the data acquisition module is transmitted to the arrester state monitoring device, and the arrester state monitoring device further obtains detailed information such as leakage current, resistive current, capacitive current, phase angle, and lightning current related parameters when lightning occurs of each arrester through operation analysis and processing. Each interval contains 3 arrester state monitoring devices, and the 3 arrester state monitoring devices are transmitted in parallel in RS-485 communication to the interval containing the communication unit, the communication unit preliminarily integrates and converts the received information, and then transmits it to the background workstation through optical conversion device with optical fiber communication, the background workstation evaluates the running state of the arrester and the damage degree after lightning through comprehensive research and analysis of the transmission information; timely alarm is given to the arrester that does not meet the operation requirements, reminding the operation and maintenance personnel to repair and maintain in time.

[0024] The working principle of the data acquisition module is as follows:

[0025] ​The data acquisition module is used for acquiring the operating parameters of the high-voltage surge arrester, and the operating parameters include leakage current, resistive current, capacitive current, PT voltage, phase angle, lightning stroke times, and lightning-related parameters after suffering lightning stroke. The data acquisition module includes a new composite sensor and a PT voltage acquisition module. The new composite sensor adopts a core-penetrating design, and outputs an alternating voltage signal by sensing the leakage current signal in the measured electrical equipment; meanwhile, a lightning current waveform measurement coil is built-in, which is used for accurately capturing and recording the lightning parameters when the surge arrester suffers lightning stroke. The PT voltage acquisition module mainly acquires the output voltage signal of the line voltage transformer (PT) in the power system.

[0026] The working principle of the surge arrester state monitoring device is as follows:

[0027] The surge arrester state monitoring device is arranged at a field position close to the high-voltage surge arrester, and is used for receiving and processing the data transmitted by the data acquisition module on site, including a data storage unit, a data preprocessing module, a fault preliminary diagnosis module, and a communication interface.

[0028] The working principle of the background workstation is as follows:

[0029] The background workstation is used for receiving, storing, and deeply analyzing and processing the data transmitted by the on-site monitoring device. The background workstation receives the massive data transmitted by the surge arrester state monitoring devices, and the data includes the leakage current, resistive current, capacitive current, PT voltage, action times, and lightning-related parameters of the high-voltage surge arrester under different time periods and different working conditions, and comprehensively judges the state of the high-voltage surge arrester based on the collected data, and performs comprehensive performance evaluation on the surge arrester in different threshold states in different state levels such as "excellent, good, medium, poor, and bad".

[0030] As shown in Figure 2 A high-voltage surge arrester operation safety intelligent early warning system includes the following steps:

[0031] S1, data acquisition: used for acquiring the operating parameters of the high-voltage surge arrester, and the operating parameters include leakage current, resistive current, capacitive current, PT voltage, phase angle, lightning stroke times, and lightning-related parameters after suffering lightning stroke;

[0032] S2, data analysis: the surge arrester state monitoring device performs operation analysis and processing after receiving the data transmitted by S1, and further obtains detailed information such as leakage current, resistive current, capacitive current, phase angle, and lightning current-related parameters when lightning stroke occurs of each surge arrester;

[0033] S3, data transmission and conversion: the communication unit integrates the data transmitted by S2, and converts the integrated data into optical signals through an optoelectronic conversion device for transmission;

[0034] S4, background evaluation: the background workstation transmits the data received in S3, converts the optical signal into an electrical signal, comprehensively analyzes, evaluates and diagnoses the received signal, and displays the monitored arrester operation state and parameters in the form of a system picture. If the arrester has an abnormal fault state, a pop-up window alarm is sent in time.

[0035] As shown in Figure 3 The module works as follows:

[0036] The data acquisition module collects data in two parts, one part is from the data collected by the composite sensor, and the other part is from the external PT voltage collected by the PT voltage signal acquisition module inside the arrester state monitoring device.

[0037] The composite sensor contains a leakage current acquisition unit and a lightning parameter capture unit. When lightning occurs, the lightning current i passes through the arrester and is discharged to the ground through the grounding bar, and the composite sensor is wrapped outside the grounding bar (i.e. the grounding bar passes through the composite sensor). In this process, the composite sensor collects leakage current and captures lightning parameters, and then transmits data to the arrester state monitoring device through serial communication.

[0038] The arrester state monitoring device also collects PT voltage, and through these two parts of data, the operating parameters of the high-voltage arrester (leakage current, resistive current, capacitive current, PT voltage, phase angle, lightning strike times and lightning-related parameters after lightning strike) can be collected.

[0039] As shown in Figure 4 The embodiment provides an installation position diagram of the data acquisition module of the high-voltage arrester operation safety intelligent early warning system.

[0040] The arrester is installed on the arrester column and grounded through the grounding wire. Under normal circumstances, an arrester counter device will be assembled on site, and this device is connected in series between the grounding wire and the ground. The newly added acquisition module of the embodiment needs to be installed before the arrester counter device, and the grounding wire passes through the center of the acquisition module.

[0041] Since the arrester state monitoring device also has the function of lightning strike counting of the arrester, if the arrester state monitoring device is installed on site, the arrester counter device can be removed, reducing the cost of the user.

[0042] The above is only a preferred embodiment of the present application, and is not used to limit the protection scope of the present application. Any equivalent transformation made by a person skilled in the art by reading the technical scheme of the present application is covered by the patent claim.

Claims

1. A high-voltage surge arrester operation safety intelligent early warning system, characterized in that, include: Data acquisition module, surge arrester status monitoring device, communication unit, and back-end workstation; The relevant information collected by the data acquisition module is transmitted to the surge arrester status monitoring device. The device then processes and analyzes the data to obtain detailed information on each surge arrester, including leakage current, resistive current, capacitive current, phase angle, and parameters related to the lightning current captured during a lightning strike. Each bay contains three surge arrester status monitoring devices. These three devices are connected in parallel via RS-485 communication and transmit data centrally to the bay containing the communication unit. The communication unit performs preliminary integration and conversion of the received information before transmitting it to the back-end workstation via fiber optic communication through a photoelectric conversion device. The back-end workstation comprehensively analyzes the transmitted information to assess the operating status of the surge arresters and the extent of damage after a lightning strike. It promptly alarms surge arresters that do not meet operating requirements, alerting maintenance personnel for timely repair and maintenance.

2. The intelligent early warning system for the safe operation of a high-voltage surge arrester according to claim 1, characterized in that: Specifically, the following steps are included: S1. Data Acquisition: Used to collect the operating parameters of the high-voltage surge arrester, including leakage current, resistive current, capacitive current, PT voltage, phase angle, number of lightning strikes, and lightning-related parameters after being struck by lightning. S2. Data Analysis: After receiving the data transmitted by S1, the surge arrester status monitoring device performs calculation and analysis to obtain detailed information such as leakage current, resistive current, capacitive current, phase angle, and relevant parameters of lightning current captured when a lightning strike occurs for each surge arrester. S3. Data transmission and conversion: The communication unit receives and integrates the data transmitted by S2, and then converts the integrated data into an optical signal for transmission through a photoelectric conversion device. S4. Back-end evaluation: The back-end workstation receives the data transmitted by S3, converts the optical signal to an electrical signal, performs comprehensive analysis, evaluation, and diagnosis of the received signal, and displays the overall operating status and parameters of the monitored surge arrester in the form of a system screen. If an abnormal fault condition is found in the surge arrester, a pop-up alarm will be triggered in time.

3. The intelligent early warning system for the safe operation of a high-voltage surge arrester according to claim 1, characterized in that: The data acquisition module in this system uses a composite sensor with two measurement ranges: microampere-level surge arrester leakage current acquisition and kiloampere-level lightning current acquisition.

4. The intelligent early warning system for the safe operation of a high-voltage surge arrester according to claim 1, characterized in that: The data acquisition module in this system uses a composite sensor for signal transmission. It samples 128 points every 20ms using a 16-bit AD converter and performs noise filtering to obtain high-precision operating parameters.

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