Test method for insulation detection of distribution cables

A technology of distribution cables and test methods, which is applied in the direction of testing dielectric strength, measuring electricity, measuring devices, etc., can solve the problems of low detection efficiency and long testing time of ultra-low frequency field tests, so as to improve test efficiency and shorten time Effect

Active Publication Date: 2020-08-11
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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Problems solved by technology

[0005] The purpose of the present invention is to provide a distribution cable insulation detection test method to solve the technical problem of low detection efficiency caused by the long time of ultra-low frequency field test in the prior art

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  • Test method for insulation detection of distribution cables
  • Test method for insulation detection of distribution cables
  • Test method for insulation detection of distribution cables

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Embodiment Construction

[0046] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0047] Please refer to figure 1 , figure 1 It is a schematic flow chart of a distribution cable insulation detection test method provided by an embodiment of the present invention. The method includes:

[0048] S101: Using a square wave generator to generate ultra-low frequency cosine high voltage square waves of different frequencies.

[0049] The schematic diagram of the square wave generator is as follows: figure 2 As shown, it mainly includes a positive polarity DC source, a negative polarity DC source, an electronic switch, a diode, and an L-C circuit. Th...

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Abstract

The invention provides a test method for insulation detection of a distribution cable. The test method is applied to the field of safe operation of distribution cables. The test method comprises the following steps: generating ultra-low frequency cosine high-voltage square waves of different frequencies by utilizing a square-wave generator; preparing water tree defects by adopting water tree acceleration test; measuring the growth situations of the water tree defects under the action of the ultra-low frequency cosine high-voltage square waves to obtain original data; performing data analysis on the original data to obtain the optimal ultra-low frequency cosine square wave frequency for water tree growth; performing parameter configuration on a fast ultra-low frequency test device accordingto the optimal ultra-low frequency cosine square wave frequency; performing fast ultra-low frequency test on the distribution cable by using the fast ultra-low frequency test device; determining theinsulation grade of the distribution cable according to test results. The test method for the insulation detection of the distribution cable, provided by the invention, can shorten the detection timeand improve the detection efficiency.

Description

technical field [0001] The invention belongs to the technical field of safe operation of power distribution cables, and more specifically relates to a method for detecting and testing the insulation of power distribution cables. Background technique [0002] Power cables have the advantages of being less affected by the external environment and high reliability of power supply, and their proportion in power grids, especially urban power grids, is getting higher and higher. Among them, the reliability of cable power supply is closely related to factors such as the manufacturing process of intermediate connectors, terminals and other accessories, the operating environment of the cable, and the service life. Several major accidents in power grids at home and abroad were caused by cable defects, resulting in huge economic losses and serious social impacts. At this stage, 10kV distribution cables are used in the largest amount in the power grid, the operating environment is the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/20G01R31/12
CPCG01R31/1272G01R31/20
Inventor 魏力强贾伯岩齐锦涛马天祥杜旭浩刘振李雪松
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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