A lightning arrester monitoring method and system suitable for smart substations

一种智能变电站、监测系统的技术，应用在智能变电站领域，能够解决避雷器监测系统及方法不能满足智能变电站建设等问题，达到大现场工程应用价值、提高精确度、解决电压和电流信号的同步的效果

Active Publication Date: 2018-12-04
XUJI GRP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a lightning arrester monitoring method and system suitable for intelligent substations to solve the problem that the current lightning arrester monitoring system and method cannot satisfy the construction of intelligent substations

Method used

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  • A lightning arrester monitoring method and system suitable for smart substations
  • A lightning arrester monitoring method and system suitable for smart substations
  • A lightning arrester monitoring method and system suitable for smart substations

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Embodiment Construction

[0034] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0035] Embodiment of lightning arrester monitoring method applicable to smart substation

[0036] Such as figure 1 As shown, the implementation steps of the method include:

[0037] 1) Obtain the original sampling value of the leakage current of the arrester through the current sensor;

[0038] 2) Resampling the leakage current and the SV voltage signal sent by the merging unit to obtain the resampling values ​​of the leakage current and the SV voltage signal respectively;

[0039] 3) performing Fourier transform on the resampled values ​​of the leakage current and the SV voltage signal to obtain the amplitude and phase of the resampled values ​​of the leakage current and the SV voltage signal;

[0040] 4) Calculate the angle between the leakage current and the SV voltage signal according to the phase of the leakage current and the resamp...

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Abstract

The invention relates to a lightning arrester monitoring method and system suitable for intelligent substations. The method includes the following steps: 1) obtaining the original sampling value of the leakage current of the lightning arrester; 2) resampling the leakage current and the SV voltage signal; 3) using the Fu Calculate the amplitude and phase of the resampled value of the leakage current and the SV voltage signal through Lie transform; 4) Calculate the angle between the leakage current and the SV voltage signal according to the phase of the resampled value of the leakage current and the SV voltage signal. The wave projection method is used to calculate the resistive current; 5) The resistive current after the median filtering process is compared with the set threshold to judge, and if the set threshold is exceeded, an on-site early warning is given. The system includes an acquisition unit and a data processing unit. The method and system of the invention reduce the electromagnetic interference and improve the fault detection accuracy of the lightning arrester.

Description

technical field [0001] The invention relates to the field of intelligent substations, in particular to a method and system for monitoring lightning arresters suitable for intelligent substations. Background technique [0002] Zinc oxide surge arresters are important electrical components in power systems, and the normal operation of their equipment is an important guarantee for the safe and reliable operation of other electrical equipment. On-line monitoring and on-site diagnosis and analysis of zinc oxide arresters can detect potential faults of arresters in time, effectively eliminate faults, and ensure the safe and stable operation of arresters and the entire power system. [0003] The monitoring parameters of the zinc oxide arrester are mainly leakage current, resistive current, capacitive current and number of lightning strikes, among which the resistive current is the main parameter reflecting the degree of deterioration of the arrester equipment. Resistive current is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/1236G01R31/14H02H9/042H02H9/04
Inventor 雍明超梁武民路光辉王伟杰周水斌曾国辉龚东武庄益诗吕侠杨芳卢声周钟牧继清郭旭王志成
Owner XUJI GRP
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