Insulation defect locating method

A technology of insulation defect and angular position, applied in the direction of using re-radiation, measuring device, instrument, etc., can solve the problem of large variation of UHF signal amplitude

Active Publication Date: 2013-03-13
XI AN JIAOTONG UNIV
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Problems solved by technology

However, due to the external sensor, the UHF signal amplitude actually measured on site often changes greatly due to external interference, so this method also has certain limitations
Based on the above analysis, the traditional UHF partial discharge on-line monitoring and positioning method has certain defects.

Method used

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Embodiment Construction

[0012] In one embodiment, a method for locating insulation defects in GIS internal partial discharge on-line monitoring is provided. The technical idea is to analyze the propagation and attenuation characteristics of electromagnetic waves radiated by partial discharge in different directions, and use radial and The attenuation law of the electromagnetic wave component in the two axial directions is used to locate the discharge defect in the circumferential angle and axial direction of the GIS cavity respectively.

[0013] Specifically, the method includes the following steps:

[0014] (1) Establish the attenuation characteristic curve library of the peak-to-peak value of the UHF electromagnetic wave signal generated by partial discharge in the radial direction at different circumferential angles of the GIS cavity;

[0015] (2) By comparing the current target radial peak-to-peak attenuation characteristic curve with the attenuation characteristic curve library in (1), find simi...

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Abstract

The invention discloses an insulation defect locating method in partial discharge online monitoring inside gas insulated switchgear (GIS). The method is based on an ultra high frequency (UHF) method for partial discharge monitoring, and the circumferential angle of the defect on the GIS cross section is located through attenuation variation of peak-to-peak value of coupling electromagnetic waves on different circumferential angles in the GIS. The invention further provides a method for extracting a TM mode in UHF electromagnetic waves independently, and the defect is axially located through the attenuation variation of the coupling electromagnetic waves on the axial direction. According to the methods, the problem of difficult reading at a discharge start moment in the existing method in which the locating is performed through electromagnetic wave propagation time difference is solved, and partial discharge in the GIS can be located effectively.

Description

technical field [0001] The invention relates to the field of on-line monitoring of partial discharge inside GIS, in particular to a method for locating insulation defects applied to on-line monitoring of partial discharge inside GIS. Background technique [0002] Gas Insulated Switchgear (GIS for short) is a new type of power transmission and transformation equipment that appeared in the mid-1960s. It combines all or part of various electrical equipment in the substation except transformers in a closed metal casing. Inside, and filled with 0.4~0.5MPa SF6 gas with excellent insulation performance, in order to realize the insulation of the conductor to the fracture, between phases and between fractures. It has the advantages of small footprint, less interference from the external environment, long maintenance cycle, small on-site installation workload and short construction cycle. [0003] Although the reliability of GIS equipment operation is very high, because of its inevit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01S11/06
Inventor 王小华李天辉荣命哲刘定新
Owner XI AN JIAOTONG UNIV
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