Leakage current detector for ground wire of high-voltage cable shielding net

Abstract

The invention relates to a leakage current detector for a ground wire of a high-voltage cable shielding net. The leakage current detector comprises an aluminium alloy shell, wherein an alternating-current and direct-current power supply device and a detection device are arranged in the aluminium alloy shell; the anode and the cathode of the alternating-current and direct-current power supply device are respectively connected with a frequency selecting circuit; a secondary side of a current sensor is connected with an I / V conversion circuit through a shielding wire; the I / V conversion circuit is respectively connected with a bidirectional analog output port and the frequency selecting circuit; the frequency selecting circuit is respectively connected with a filtering circuit and a rectifying loop; the filtering circuit is connected with the rectifying loop; the rectifying loop is connected with a peak response time selecting circuit; the peak response time selecting circuit is respectively connected with the input ends of a peak holding loop and an LCD (Liquid Crystal Display) driving loop; and the output end of the peak holding loop 318 is sequentially and electrically connected with a voltage dividing loop, the LCD driving loop and an LCD display screen. According to the leakage current detector, the problem of cable burning loss caused by untimely discovery of multipoint grinding of a grinding wire of an existing cable shielding net is solved.

Description

technical field [0001] The invention relates to a detector, in particular to a detector for leakage current of a grounding wire of a high-voltage cable shielding network. Background technique [0002] At present, the known leakage current test of the grounding wire of the shielding network of high-voltage cables has not been included in the test procedures, and there is no such test instrument in China. Contents of the invention [0003] In order to solve the problems existing in the prior art, the present invention provides a high-voltage cable shielding network grounding wire leakage current detector, which can detect the grounding current of the power cable shielding network and judge whether there is a multi-point grounding problem in the cable shielding network grounding wire , which solves the problem of cable burnout caused by multi-point grounding of the grounding wire of the existing cable shielding network. [0004] The technical scheme adopted in the present i...

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Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the present invention provides a high-voltage cable shielding network grounding wire leakage current detector, which can detect the grounding current of the power cable shielding network and judge whether there is a multi-point grounding problem in the cable shielding network grounding wire , which solves the problem of cable burnout caused by multi-point grounding of the grounding wire of the existing cable shielding network

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