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Alternate current/direct current (AC/DC) superimposed system for detecting particles in gas insulated switchgear (GIS)

An AC/DC and microparticle technology, which is applied in the analysis of materials, instruments, etc., can solve the problems that metal particles are not well resolved, metal particles jumping phenomenon, etc.

Active Publication Date: 2014-09-17
YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST +1
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  • Claims
  • Application Information

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Problems solved by technology

However, these methods mainly have their own characteristics, and there is still no good solution for the detection of metal particles, because the usual partial discharge detection methods include pulse current method, ultrasonic detection method and ultra-high frequency detection method. When the initial field strength of partial discharge and the initial electron collapse, this kind of defect will not produce partial discharge, because the pulse current and ultra-high frequency detection method does not have its obvious advantages, but the metal particles can be detected under the action of the electric field and the rubber hammer When hitting the GIS shell, metal particles will jump and release ultrasonic mechanical vibration signals. Even if there is no partial discharge phenomenon, the ultrasonic detection method has high sensitivity to the metal conductive particles inside the GIS.

Method used

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  • Alternate current/direct current (AC/DC) superimposed system for detecting particles in gas insulated switchgear (GIS)

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Embodiment Construction

[0013] See figure 1 , a system for superimposing AC and DC to detect particles in GIS, the present invention is characterized in that: the system includes three parts of DC voltage doubler cylinder 1, AC voltage generator 2 and ultrasonic partial discharge testing device 3, and its connection structure is:

[0014] The DC voltage doubler cylinder 1 is composed of a high-voltage silicon stack for the DC voltage doubler cylinder, a voltage doubler capacitor 14, a filter capacitor 15, a voltage regulator 4 for the DC voltage doubler cylinder, and a step-up transformer 5 for the DC voltage doubler cylinder; The silicon stack A 13 end is connected to the water resistor A16 and one way is connected to the lead sleeve 20 through the DC conversion switch 17, and the other way is connected to the water resistance B 19 through the AC conversion switch 18, and the water resistance B 19 is connected to the AC voltage generator 2; The lead bushing 20 is connected to the high-voltage conduc...

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Abstract

The invention provides an alternate current / direct current (AC / DC) superimposed system for detecting particles in a gas insulated switchgear (GIS). The AC / DC superimposed system comprises a direct current (DC) voltage voltage-multiplying cylinder (1), an alternate current (AC) voltage generator (2) and an ultrasound local-discharge test device (3). The AC / DC superimposed system provides a method for detecting metal particles in the GIS through superimposed AC / DC, and has the advantages of simple test, obvious effect, and the like.

Description

technical field [0001] The invention relates to the technical field of AC / DC high voltage superimposed partial discharge signal measurement and diagnosis for GIS defect diagnosis. Background technique [0002] Due to its key role in the power system, GIS (Gas Insulated Switchgear) is often used in important fields that require high reliability and high power supply continuity, so it takes on this important responsibility. At the same time, GIS is considered to be a maintenance-free product, but in the actual application of power production, it is found that GIS is not as effective as people imagined, and insulation problems often occur, and even cause GIS to malfunction. Therefore, electric power researchers hope to obtain substantive evidence of GIS internal insulation problems through a non-destructive testing method, and then notify the power supply department to perform switching operations in advance, safely trip this line, isolate insulation equipment faults, and perfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/00
Inventor 谭向宇杨卓赵现平王达达王科彭晶张少泉马仪陈磊徐肖伟刘红文
Owner YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST
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