Partial discharge test device for high-voltage cable insulation middle joint and use method

Abstract

The invention relates to a partial discharge test device for a high-voltage cable insulation middle joint and a use method. The partial discharge test device is characterized in that each cross bonding link box and two connecting points connected with the same insulation middle joint are respectively connected with one end of a cable, and the middle of the cable is wound into a plurality of turns of coils; and a high frequency current sensor is reeved through the coils, and the output end of the high frequency current sensor is connected with a partial discharge measurement device. According to the partial discharge test device provided by the invention, the two connecting points connected with the insulation middle joint are connected by the cable, and the partial discharge live detection of the insulation middle joint is realized through the output of the high frequency current sensor, so that the defect that the high frequency current sensor can not be placed because the size standard of the cross bonding link boxes and connection sheets is different is overcome, and the test process is quick and very convenient.

Description

technical field [0001] The invention belongs to the field of partial discharge test devices for high-voltage cable insulation intermediate joints, in particular to a partial discharge test device for high-voltage cable insulation intermediate joints and a use method. Background technique [0002] The power industry standard DL / T5221-2005 "Technical Regulations on Design of Urban Power Cable Lines" and the State Grid Corporation of China Enterprise Standard Q / GDW512-2010 "Operation Rules for Power Cable Lines" stipulate that the selection of metal shielding grounding methods for single-core cable lines should comply with The following regulations: (1) When the cable line is short and meets the requirements of the induced voltage regulations, it can be directly grounded at one end of the line and grounded at the other end through a voltage limiter, or directly grounded at a single point in the middle and passed through a voltage limiter at both ends. grounded. (2) For cable l...

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Problems solved by technology

[0004] In the test, a high-frequency current sensor is installed on the connecting piece of the cross-connection box to detect the high-frequency partial discharge pulse current signal in the ground current, and evaluate the operation status of the cable terminal. The size of the chip is different from the standard, and there are situations where the continuous film is too wide, the sensor cannot pass through, and the box space is too small, the distance between the continuous film is too close, and no sensor space is reserved, which makes it impossible to measure the partial discharge signal.

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