Analog electrode device for space charge detection of cable insulation layer

Abstract

An analog electrode device for space charge detection of a cable insulation layer is characterized by comprising a test probe mechanism, a grounding mechanism and a target cable equivalent insulationlayer sample disposed between the test probe mechanism and the grounding mechanism, wherein shielding layers are provided on both sides of the target cable equivalent insulation layer sample; the testprobe mechanism comprises a guiding rod and a pressure equalizing ball and an electrode disposed at both ends of the guiding rod, wherein the outside of the guiding rod is provided with a tetrafluoroethylene column and a metal cavity filled with epoxy resin in sequence. The analog electrode device provided by the invention can simulate the space charge distribution information of the target cableunder operating conditions according to the structural size of the cable and the selection of the insulating material before the target cable is officially produced.

Description

technical field [0001] The invention relates to a technology in the field of power transmission materials, in particular to an analog electrode device suitable for detecting space charge on an insulating layer of a coaxial cable. Background technique [0002] In order to solve the accumulation of space charge on the insulating layer of flexible DC transmission cables under operating conditions, space charge detection technologies and devices based on different charge detection principles have been widely developed, among which the application of electroacoustic pulse is the most common. The space charge detection of the existing flexible DC cable insulation layer is mainly divided into two categories, one is the insulation slice detection of the DC cable insulation layer, that is, the insulation slices at different positions of the cable insulation layer are extracted by an insulation slicer, and then the flat electrode structure is used to detect the space charge. The devic...

AI Technical Summary

Problems solved by technology

Among the two types of detection methods, the second type of detection is closest to the actual cable structure, but for the design and development of DC cables, this type of detection has two limitations: first, the factory needs to design and manufacture the target in advance based on experience. Cable samples, followed by on-site detection of cable space charge, due to the thicker cable insulation layer, higher requirements for detection equipment and site

[0003] The above two limitations lead to high cost and long detection period for the space charge detection of the actual coaxial structure cable, and it is impossible to provide space charge information for the design and development of the target cable before the official production of the DC cable

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