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

A technology of intermediate joints and high-voltage cables, applied in the direction of testing dielectric strength, etc., can solve problems such as the inability of contiguous sensors to penetrate, the inability to measure partial discharge signals, and the lack of space for sensors, so as to achieve a rapid testing process and avoid cross-connection. The effect of different box and link size standards

Active Publication Date: 2013-09-18
STATE GRID CORP OF CHINA +1
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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

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

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Embodiment Construction

[0020] Below in conjunction with the examples, the present invention is further described, the following examples are illustrative, not limiting, and the protection scope of the present invention cannot be limited by the following examples.

[0021] A high-voltage cable insulation intermediate joint partial discharge test device, such as figure 1 As shown, it includes three high-voltage cables 2, insulating intermediate joints 3 and cross-connection boxes 5, and three insulating intermediate joints are installed on each high-voltage cable, wherein two insulating intermediate joints are respectively connected to a cross-connection box through cables, the present invention The innovation lies in that the two connection points 6 and 7 connected to the same insulating intermediate connector of each cross-connection box are respectively connected to one end of a cable 11, and the middle part of the cable is wound into a multi-turn coil 12, and the coil is equipped with A high-frequ...

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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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Application Information

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IPC IPC(8): G01R31/12
Inventor 周凤争张东斐朱晓辉刘宝成郭勇孟峥峥齐效华王浩鸣李旭
Owner STATE GRID CORP OF CHINA
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