Method for judging insulation aging degrees of alternating current (AC) cables

A technology of insulation aging and cable insulation, applied in the direction of testing dielectric strength, etc., can solve the problems of detection, can not express cable aging, can reveal the aging law of cable insulation and select aging characterization parameters without adaptation, and achieve the effect of accurate evaluation.

A technology of insulation aging and cable insulation, applied in the direction of testing dielectric strength, etc., can solve the problems of detection, can not express cable aging, can reveal the aging law of cable insulation and select aging characterization parameters without adaptation, and achieve the effect of accurate evaluation.

CN102759690AInactive Publication Date: 2012-10-31CHINA ELECTRIC POWER RES INST
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  • Method for judging insulation aging degrees of alternating current (AC) cables
  • Method for judging insulation aging degrees of alternating current (AC) cables
  • Method for judging insulation aging degrees of alternating current (AC) cables

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Embodiment Construction

[0022] Embodiments of the invention will be further described below in conjunction with the accompanying drawings: figure 1 ~ attached Figure 6 , a method for judging the aging degree of AC cable insulation in the present invention is to calculate the carbonyl index of each sample through space charge measurement and physical and chemical performance testing, and then comprehensively judge the aging degree of AC XLPE cable insulation. Wherein the space charge measurement and physical and chemical performance test, and the method of calculating the carbonyl index of each sample is carried out as follows:

[0023] (1) Firstly, from the AC XLPE cables that have not been aged, accelerated for 1 year, and have been in actual operation for 30 years, 9 insulation dielectric samples are taken from the outer, middle and inner layers along the radial direction.

[0024] (2) Place the 9 samples at the same time in a vacuum oven at 80°C for 8 hours. The accelerated aging condition of t...

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Abstract

The invention relates to a method for judging insulation aging degrees of alternating current (AC) cables. The method has the following beneficial effects: different insulation aging rules of the AC cables are obtained through space charge measurement and physico-chemical performance test and in combination with carbonyl indexes of the unaged cables, computed through comparison,,the cables aged one year and the cables operated for 30 years. The method is characterized by after drying three kinds of cable samples at different aging degrees, carrying out charge accumulation characteristic test, weightlessness percentage determination, activation energy TG value computation, infrared spectroscopic analysis and carbonyl index computation in sequence and then drawing the relation curve of the carbonyl indexes, the sampling positions and the aging time. The method has the following beneficial effect: the insulation aging degrees of the AC crosslinked polyethylene (XLPE) cables are comprehensively judged according to the obtained test data.

Description

technical field [0001] The invention relates to a method for judging the insulation aging degree of AC cables. Specifically, it adopts a method combining space charge measurement and physical and chemical performance analysis to evaluate the aging state of accelerated insulation aging cables and long-term actual operation cables, and judge XLPE AC cables. Insulation aging degree. It belongs to the technical field of power system measurement. Background technique [0002] Cross-linked polyethylene (XLPE) cables are widely used in power transmission networks. The measurement and evaluation of the cable insulation aging degree is an important content, which is conducive to making accurate suggestions for the replacement of the cable after aging. The method of measuring the space charge in the cable insulation through the action of the DC electric field is a common technique for evaluating the aging of the DC cable insulation, but it is still lacking in the evaluation of the i...

Claims

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Application Information

Patent Timeline
31 Oct 2012
Publication
CN102759690A
IPC
G01R31/12
Inventors
欧阳本红; 赵健康