Method for measuring partial discharge of joint with insulation defect

A technology of partial discharge and measurement method, which is applied in the direction of testing dielectric strength, etc., can solve the problems of decision-making uncertainty in cable equipment maintenance and replacement, and can not give the type of insulation defect of partial discharge discharge, etc., so as to improve the reliability of power supply , the effect of preventing sudden failure

Inactive Publication Date: 2011-04-06
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many XLPE cable partial discharge on-line detection devices developed at home and abroad. Although partial discharge can be detected, the type of insulation defect that causes partial discharge discharge cannot be given, which brings uncertainty to the decision-making of cable equipment maintenance and replacement.

Method used

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  • Method for measuring partial discharge of joint with insulation defect
  • Method for measuring partial discharge of joint with insulation defect

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with specific examples.

[0016] Such as figure 1 As shown, a partial discharge measurement method for an insulation defect joint, the method hardware includes a joint 1 with an insulation defect, a signal lead line 2, a water pipe 3, a water terminal device 4, a power frequency high voltage interface 5, and a signal sensor 6, including the following Steps to realize: 1) Connect the two ends of the joint 1 with insulation defect to the water pipe 3, and set the water terminal equipment 4 at the end of the water pipe 3; 2) Set the signal lead-out line 2 on the joint 1 with the insulation defect; 3) In the Power frequency high voltage is applied to the water terminal equipment 4 on both sides, and the signal sensor 6 collects the partial discharge signal; 4) The partial discharge signal is output through the signal lead-out line 2 . The signal sensor 6 is installed in the middle joint of the joint 1 wit...

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Abstract

The invention relates to a method for measuring the partial discharge of a joint with an insulation defect, which comprises the following steps of: 1) connecting water pipes with the two ends of the joint with the insulation defect and arranging water terminal equipment at the tail end of each water pipe; 2) arranging a signal leading-out wire on the joint with the insulation defect; 3) applying power frequency high voltage to the water terminal equipment on the two sides, and acquiring a partial discharge signal by using a signal sensor; and 4) outputting the partial discharge signal through the signal leading-out wire. Compared with the prior art, the method has the advantages of effectively judging the insulation condition, preventing the sudden failure of cable equipment, and improving the power supply reliability of a cable system.

Description

technical field [0001] The invention relates to an insulation measurement method, in particular to a partial discharge measurement method for an insulation defect joint. Background technique [0002] As high-voltage and extra-high-voltage power cables are more and more widely used in power systems, how to realize the status detection of these cable equipment and ensure the safe and reliable operation of the cable equipment has become a hot research topic at home and abroad. [0003] In the high-voltage and ultra-high-voltage cross-linked polyethylene (XLPE) power cable system, the cable accessories are all manufactured and installed manually under on-site conditions, and their insulation quality is often lower than the insulation level of the cable body, which is the weak link in the insulation of the cable system. Various insulation defects formed by poor joint construction technology make the electric field distribution in the joint uneven, resulting in partial discharge. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 姜芸罗俊华李煜赵健康李海夏荣闵红李文杰蒋晓娟王道生顾黄品
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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