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Comprehensive live test method of insulation defects of metal oxide arrester for electric power

A comprehensive detection and lightning arrester technology, which is applied in the direction of instruments, measuring electronics, measuring devices, etc., can solve the problems of low detection efficiency, inability to effectively and timely determine defect locations, prolongation, etc., and achieve the effect of improving work efficiency

Inactive Publication Date: 2014-04-30
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the implementation of condition-based maintenance, the power-off maintenance test period of metal oxide arresters is extended accordingly. Due to the large number of live test items, the live test of general metal oxide arresters is carried out in a single item, and abnormal phenomena found in live tests are all used. Several live test methods are used for detection, which is time-consuming and labor-intensive, and the detection efficiency is low, and the defect location cannot be effectively and timely determined

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment is aimed at reporting the three-phase unbalance of the three-phase leakage current of a 220kV line arrester for a substation arrester leakage current online monitoring device.

[0042] The on-duty personnel checked the metal oxide arrester counter on the spot and showed that the three-phase leakage current data was A phase 1.86mA, B phase 1.92mA, and C phase 2.98mA. The three-phase leakage current data of the metal oxide arrester was unbalanced; the metal oxide arrester was tested with a clamp ammeter The three-phase leakage current data of the physical arrester is A phase 1.87mA, B phase 1.90mA, and C phase 1.88mA; the three-phase leakage current data displayed by the metal oxide arrester counter is inconsistent with the three-phase leakage current data of the metal oxide arrester tested by the clamp ammeter. However, the three-phase leakage current data of the metal oxide arrester detected by the clamp ammeter is consistent, and the defect of the metal ...

Embodiment 2

[0044] This embodiment is aimed at finding that the B-phase leakage current of the 35kV No. 4 busbar metal oxide arrester in a certain substation has doubled, and the three phases are seriously unbalanced.

[0045] The metal oxide arrester counter shows that the three-phase leakage current data is A phase 0.21mA, B phase 0.4mA, and C phase 0.22mA; the clamp ammeter test arrester three-phase leakage current data is A phase 0.214mA, B phase 0.393mA, and C phase 0.225mA. The three-phase leakage current data displayed by the metal oxide arrester counter is consistent with the three-phase leakage current data of the metal oxide arrester tested by the clamp ammeter, and the defect of the metal oxide arrester counter is excluded, and it is determined that the metal oxide arrester body is defective.

Embodiment 3

[0047] First, use the arrester resistive current tester to detect the three-phase leakage current and resistive current of the metal oxide arrester.

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Abstract

The invention relates to a comprehensive live test method of insulation defects of a metal oxide arrester for electric power. The method includes the following steps that firstly, a three-phase leakage current value is detected through a tong-type ammeter; secondly, the metal oxide arrester is tested through an arrestor resistive current tester; thirdly, the metal oxide arrester is detected through an infrared thermal imager; fourthly, high-frequency partial discharge detection data of the metal oxide arrester are analyzed, and whether discharging exists in the metal oxide arrester or not is determined; fifthly, the outer insulating surface of the metal oxide arrester is subjected to corona discharge detection through an ultraviolet imager. By adopting the method, counter defects and insulating defects like inner damping or valve slice aging of the metal oxide arrester for electric power can be quickly detected and positioned, and working efficiency is improved; the method has the advantages that power failure does not exist, the structure is simple, efficiency is high, and a visual effect can be achieved.

Description

technical field [0001] The invention relates to a live comprehensive detection method for insulation defects of a metal oxide arrester for electric power. Background technique [0002] In power systems, arresters can suppress lightning or operate overvoltages to control voltage stability. At present, the application range of metal oxide arresters is gradually expanding and finally becomes the mainstream type of arrester selection in power systems. This metal oxide arrester is assembled by stacking metal oxide valve plates. For metal oxide arresters with a voltage level of 110kV and above, A shunt capacitor will be installed for voltage equalization. In order to suppress the occurrence of high-voltage partial discharge, the conventional insulating porcelain bottle or epoxy cylinder coated with vulcanized silicone rubber container will be filled with a certain pressure of SF after the valve plate and voltage equalizing capacitor are assembled. 6 For gas, metal oxide arresters...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R31/12
Inventor 胡伟涛
Owner STATE GRID CORP OF CHINA
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