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Lightning arrester monitoring method applicable to intelligent transformer station and system

A technology for smart substations and arresters, applied in the field of smart substations, can solve the problem that the arrester monitoring system and method cannot meet the construction of smart substations, etc., and achieve the effect of large field engineering application value, reducing the influence caused by the system, and improving the accuracy.

Active Publication Date: 2015-11-11
XUJI GRP +3
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  • 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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  • Lightning arrester monitoring method applicable to intelligent transformer station and system
  • Lightning arrester monitoring method applicable to intelligent transformer station and system
  • Lightning arrester monitoring method applicable to intelligent transformer station and system

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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 discloses a lightning arrester monitoring method applicable to an intelligent transformer station and a system. The method comprises the steps of (1) obtaining a leakage electric current original sample value of the lightning arrester, (2) performing re-sampling processing on the leakage electric current and SV voltage signals, (3) utilizing Fourier transform to calculate the leakage electric current and the amplitude and the phase of the re-sampling value of SV voltage signal, (4) calculating the included angle of the leakage electric current and the SV voltage signal according to the phase of the re-sampling value of the leakage current and the SV voltage signals, and calculating the resistance current according to a fundamental wave projection method, and (5) comparing the resistance current which is processed by median filtering with a set threshold value, and if the resistance current exceeds the preset threshold, performing in-place alarming. The system disclosed by the invention comprises a collection unit and a data processing unit. The method and the system reduce the electromagnetic interference and improve the fault detection accuracy o the lightening 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 Applications(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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