Online power cable partial discharge monitoring system based on electromagnetic waves and high-frequency current transformer (CT)

A power cable and partial discharge technology, applied in the direction of testing dielectric strength, etc., can solve the problems of XLPE cable insulation aging and imperfect detection technology, reduce sudden accidents, ensure safe and reliable operation, and have a simple structure Effect

Inactive Publication Date: 2012-06-13
STATE GRID SHANDONG ELECTRIC POWER
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the research on the partial discharge detection method of cable insulation has been carried out in foreign countries since the 1960s, and lo

Method used

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  • Online power cable partial discharge monitoring system based on electromagnetic waves and high-frequency current transformer (CT)
  • Online power cable partial discharge monitoring system based on electromagnetic waves and high-frequency current transformer (CT)
  • Online power cable partial discharge monitoring system based on electromagnetic waves and high-frequency current transformer (CT)

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Embodiment Construction

[0037] Further illustrate structure of the present invention below in conjunction with accompanying drawing:

[0038]As shown in the figure, the power cable partial discharge on-line monitoring system based on electromagnetic wave and high-frequency CT includes broadband Rogowski coil current transformer 1 distributed at each monitoring position of the cable, broadband Rogowski coil current transformer 1 and corresponding signal The amplification module 2 is connected, and the signal amplification module 2 is connected with the data acquisition card 4 through the transmission optical fiber 3, and the data acquisition card 4 is connected with the computer 5 equipped with the background expert analysis system. The data acquisition card 4 is a multi-channel high-speed data acquisition card. The broadband Rogowski coil current transformer 1 is installed at the cable joint, the body or the grounding wire to induce partial discharge pulse signals. The signal amplification module 2 ...

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Abstract

The invention discloses an online power cable partial discharge monitoring system based on electromagnetic waves and a high-frequency current transformer (CT). The online power cable partial discharge monitoring system comprises broad frequency band Rogowski coil current mutual inductors which are distributed at respective monitoring positions of a cable, wherein the broad frequency band Rogowski coil current mutual inductors are connected with corresponding signal amplifying modules; the signal amplifying modules are connected with a data acquisition card through transmission optical fibers; and the data acquisition card is connected with a computer with a background expert analysis system. An insulation condition of a power cable is judged in real time and accurately by the combination of an optical fiber communication system and an expert recognition system, so that the effectiveness of the online power distribution cable partial discharge monitoring system is checked; therefore, the safety of a power supply network is improved, accidents of network lines are avoided, the using cost of the network lines is reduced, and the online power cable partial discharge monitoring system is an ideal online partial discharge monitoring device special for monitoring partial discharge of the power cable.

Description

[0001] technical field [0002] The invention relates to the on-line monitoring technology of the power supply network, and more specifically relates to the on-line partial discharge monitoring system of the power cable based on electromagnetic wave and high-frequency CT for real-time monitoring of the power cable in the power supply network. Background technique [0003] With the further acceleration of the transformation and upgrading of my country's urban power grids, more and more power cables are used in transmission lines and distribution networks of various voltage levels. After being put into operation, due to the introduction of impurities, air bubbles, burrs, protrusions and other defects during the production, transportation, installation and operation of the cable, or the long-term erosion and penetration of moisture, moisture, and chemical substances, the cable insulation is aging and the operating life of the cable is affected. . At present, domestic high-volt...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 赵生传时翔陈志勇江川齐蔚海王华广董啸孙晓斌张利群蔡健徐强兰显明郝代涛庄立生张永强郭英雷
Owner STATE GRID SHANDONG ELECTRIC POWER
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