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Online monitoring device of partial discharge of high-voltage cable joint and online monitoring method thereof

A partial discharge and high-voltage cable technology, applied in the field of sensors, can solve the problems of large diameter, low sensitivity, and susceptibility to electromagnetic interference, and achieve the effect of compact structure, high sensitivity, and convenient installation

Inactive Publication Date: 2010-03-10
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This kind of sensor is easy to install and basically has no effect on the cable body 16, but its diameter is large, its sensitivity is low, and it is susceptible to electromagnetic interference.

Method used

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  • Online monitoring device of partial discharge of high-voltage cable joint and online monitoring method thereof
  • Online monitoring device of partial discharge of high-voltage cable joint and online monitoring method thereof
  • Online monitoring device of partial discharge of high-voltage cable joint and online monitoring method thereof

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Embodiment Construction

[0022] The present invention is described in further detail below in conjunction with accompanying drawing:

[0023] see figure 1 , 2 , 3, the high-voltage cable joint partial discharge on-line monitoring device based on the capacitive coupling sensor, comprising a computer 6, a data acquisition unit 5 connected to the computer 6, a first capacitive coupling sensor 1, a second capacitive coupling sensor 2, a signal conditioning unit 4 and The detection impedance 3 is characterized in that: the first capacitive coupling sensor 1 and the second capacitive coupling sensor 2 are simultaneously arranged on the cable body 16 at both ends of the cable connector 7, and the first capacitive coupling sensor 1 and the second capacitive coupling sensor 2 pass through the detection impedance 3 connections, the detection impedance 3 is sequentially connected with a signal conditioning unit 4, a data acquisition unit 5 and a computer 6, and the detection impedance 3 is used to convert the c...

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Abstract

The invention discloses an online monitoring method of the partial discharge of a high-voltage XLPE cable joint based on a capacitance coupling sensor. The method comprises the following steps: fixingmetal foil on cable bodies at both ends of a cable joint to form capacitance electrodes for coupling a partial discharge signal; converting a coupled current signal into a voltage signal by detectionresistance; and further conditioning and enabling the acquired voltage signal to enter a data acquisition system; and utilizing software for anti-interference measures, such as digital filtration, phase windowing, and the like to acquire a true and practical partial discharge signal of the cable joint 7 so as to provide effective reference for estimating the insulation conditions of the cable joint 7.

Description

Technical field: [0001] The invention belongs to the field of sensors, and relates to an on-line monitoring device for partial discharge of a high-voltage cable joint, in particular to an on-line monitoring device for partial discharge of a high-voltage cable joint based on a capacitive coupling sensor and an online monitoring method thereof. Background technique: [0002] XLPE cables play a vital role in the current power system in China and the world. In the past ten years, a large number of XLPE power cables have been used in my country's urban power grids for power transmission and distribution. According to relevant statistics, accidents of power cables in power systems mainly occur at their joints. Therefore, on-site partial discharge detection of cables and joints and effective understanding of the insulation conditions of the cable joints 7 are of great significance to the safe operation of the power system and further to economic development. [0003] Most of the ...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 徐阳胡丽斌唐玉香金甲杰
Owner XI AN JIAOTONG UNIV
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