Stress ring for partial discharge tests and high-voltage insulation tests on power cable of 10 kV or lower

Abstract

The invention relates to a stress ring for partial discharge tests and high-voltage insulation tests on a power cable of 10 kV or lower. The stress ring is a metal cylindrical hollow body. The stress ring is fixed to a cable shielding layer through screws on the stress ring. The stress ring is the cylindrical hollow body with the outer diameter of 10 mm to 100 mm. An outer opening of the lower end of the stress ring is a semicircle with the diameter R of 0.5 mm to 3 mm. The height of the stress ring ranges from 30 mm to 180 mm. Due to the stress ring, a test terminal can be conveniently and rapidly installed, material consumption is low, and the stress ring is durable in use. The field intensity of the ends of the crosslinked polyethylene power cable of 10 kV or lower or other shielded power cables of 10 kV or lower is concentric under the high voltage action, and end breakdown easily occurs; especially, discharge easily occurs between an insulator of a cable core of the crosslinked polyethylene power cable and an outer shield of the power cable, and therefore the tests or flashover or breakdown or the like is influenced.

Description

technical field [0001] The invention relates to a device for detecting power cables, in particular to a stress ring for partial discharge testing and withstand voltage testing of 10kV and below power cables. Background technique [0002] In accordance with the requirements of international standards and national standards for XLPE power cables and power cables, cable manufacturers and wire and cable testing agencies must perform withstand voltage tests on XLPE power cables and power cables for routine tests or sampling tests. , XLPE power cables are also subject to partial discharge testing. [0003] 10kV and below cross-linked polyethylene power cable partial discharge test, 10kV and below other shielded power cables under the action of high voltage (up to 30.5kV), the field strength at the end of the cable is concentrated, and the end breakdown is prone to occur, especially cross-linked It is easy to discharge between the insulation and the outer shield of the polyethylen...

AI Technical Summary

Problems solved by technology

[0003] 10kV and below cross-linked polyethylene power cable partial discharge test, 10kV and below other shielded power cables under the action of high voltage (up to 30.5kV), the field strength at the end of the cable is concentrated, and the end breakdown is prone to occur, especially cross-linked It is easy to discharge between the insulation and the outer shield of the polyethylene power cable core, which will affect the test or flashover, breakdown, etc.

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