Terminal for partial discharge tests on stress ring-oil seal type crosslinked polyethylene power cable of 35 kV or lower

Abstract

The invention relates to a terminal for partial discharge tests on a stress ring-oil seal type crosslinked polyethylene power cable of 35 kV or lower. The terminal comprises a stress ring, a voltage-sharing sleeve and a high-voltage connecting voltage-sharing ring. The stress ring is composed of an inner ring and an outer ring. The inner ring is fixed to a cable shielding layer through screws. An insulating cable core is sleeved with the voltage-sharing sleeve, and a semi-conductive connector of the voltage-sharing sleeve is connected with the lower end of the inner ring. Five to sixteen umbrella skirts are arranged on the voltage-sharing sleeve. A cable conductor connecting end is arranged at the lower end of the voltage-sharing sleeve and connected with a wire core conductor. The cable conductor connecting end is connected with the upper end of the high-voltage connecting voltage-sharing ring. The lower end of the high-voltage connecting voltage-sharing ring is provided with a high-voltage connector connected with a high-voltage cable. Inner screws are arranged on the high-voltage connecting voltage-sharing ring and enable the high-voltage connecting voltage-sharing ring to be connected with the cable conductor connecting end. High voltage resistant oil is sealed in the voltage-sharing sleeve. The test terminal can be conveniently and rapidly installed, material consumption is low, and the terminal can be repeatedly used. The peeling and cutting length of the ends of the crosslinked polyethylene power cable is decreased, time for peeling and cutting the cable and installing the terminal is effectively shortened, and the test efficiency is improved.

Description

technical field [0001] The invention relates to a device for detecting power cables, in particular to a stress ring-oil-sealed cross-linked polyethylene power cable partial discharge testing terminal for 35KV and below. Background technique [0002] In accordance with the international standards and national standards for XLPE power cables of 35kV and below, cable manufacturers and wire and cable inspection agencies must carry out partial discharge tests for routine tests or sampling tests of XLPE power cables of 35kV and below. . [0003] Traditional partial discharge test terminals include freon terminals and oil terminals. Freon seriously damages the environment, while oil terminals are less stable. To ensure test stability, the stripping distance at both ends of the cable is longer. [0004] The publication specification of CN101609102A published on December 23, 2009 discloses the "terminal structure of power frequency withstand voltage and partial discharge test of med...

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Problems solved by technology

[0004] The publication specification of CN101609102A published on December 23, 2009 discloses the "terminal structure of power frequency withstand voltage and partial discharge test of medium and low voltage cross-linked cables". Gas can be used for partial discharge and pressure tests, and the installation of the terminal is also limited by the size of the cable. If the seal is not good, air leakage will occur when inflated, and the test cannot be carried out. It must be reinstalled to continue. Experiment, which is a waste of time, the speed of the experiment is not fast, and the installation is troublesome

[0005] The publication specification of CN102353879A published on December 15, 2012 discloses a "cable partial discharge test terminal", in which the technical solution is to inject freon or insulating oil into the terminal oil cup to perform partial discharge and withstand voltage tests , Freon is expensive, damages the environment, and is banned in the factory; the test effect of insulating oil is unstable, and the oil is easy to be damp, which will cause the terminal to discharge and cause the terminal to explode; and in the case of using insulating oil, the 91kV5min withstand voltage test cannot be carried out, that is, it cannot meet the requirements. The test requirements of GB / T12706-2008; the copper nail conductor connection used is prone to poor contact and cause discharge or signal attenuation

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