Ethylene-propylene rubber cable insulation aging simulation and evaluation method
A technology of cable insulation and ethylene-propylene rubber, which is applied in the field of ethylene-propylene rubber cable insulation aging simulation and evaluation, and can solve problems such as accelerated cable aging, shortened cable life, and no evaluation of cable aging status
Active Publication Date: 2020-01-03
SOUTHWEST JIAOTONG UNIV
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Among them, temperature and aging time are the main factors affecting cable aging. An increase in temperature and an increase in aging time will accelerate cable aging and shorten cable life. In severe cases, it will cause large-scale power outages and seriously threaten the safe operation of power systems.
[0003] At present, in the method of evaluating the insulation aging of ethylene-propylene rubber cables by using partial discharge spectrogram testing, there is no effective evaluation technology for evaluating the aging state of cables in actual operation. Test, establish a partial discharge spectrum library, test the partial discharge spectrum of the actual running cable and compare it with the partial discharge spectrum library, so as to determine the aging state of the actual running cable, and thus design a ethylene propylene rubber cable insulation aging simulation and Integrated approach to assessment
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[0046] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0047] Step 1: Build a cable insulation aging test platform
[0048] Build a cable insulation aging test platform, which is mainly composed of a constant temperature aging box (1), a high-voltage power generator (2), a PD detector (3), a No. 1 high-frequency current transformer (4), and a No. 2 high-frequency current transformer. device (5), No. 3 high-frequency current transformer (6), high-voltage test line (7), No. 1 aging sample (8), No. 2 aging sample (9), No. 3 aging sample (10), No. 1 ground wire (11), No. 2 ground wire (12), No. 3 ground wire (13), high-voltage test line inlet hole (14), ground wire outlet hole (15), host computer (16), No. 1 Composed of optical fiber (19), No. 2 optical fiber (20), No. 3 optical fiber (21), and high-frequency signal transmission line (22), the high-voltage test line (7) is connected to the high-voltage power g...
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The invention discloses an ethylene-propylene rubber cable insulation aging simulation and evaluation method. The method includes the steps of: carrying out cable insulation aging simulation, collecting a partial-discharge spectrum graph of a cable aging style, extracting a feature parameter of a cable aging test sample, calculating an aging factor of the cable aging style, and determining an insulation aging degree of the cable aging style according to the aging factor. The method has the advantages of establishing a partial-discharge spectrum graph library through partial-discharge testing on cables of different aging degrees, then carrying out extraction of the aging feature quantity and the aging factor, and determining the insulation aging degree of the cable aging style according tothe aging factor. The method can be used for partial-discharge spectrum graph testing on actually running cables and comparison with the partial-discharge spectrum graph library of aging styles to determine aging states of the actually running cables.
Description
technical field [0001] The invention belongs to the field of ethylene-propylene rubber cable insulation aging detection, and in particular relates to an ethylene-propylene rubber cable insulation aging simulation and evaluation method. Background technique [0002] The insulation aging of ethylene-propylene rubber cables is one of the important factors affecting the safe operation of power systems. During long-term operation, cables are gradually aging due to the influence of various factors such as electricity, heat, and magnetism. Among them, temperature and aging time are the main factors affecting cable aging. An increase in temperature and aging time will accelerate cable aging and shorten cable life. In severe cases, it will cause large-scale power outages and seriously threaten the safe operation of power systems. [0003] At present, in the method of evaluating the insulation aging of ethylene-propylene rubber cables by using partial discharge spectrogram testing, th...
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IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 郭蕾张靖康曹伟东杨涵邢立勐权圣威
Owner SOUTHWEST JIAOTONG UNIV
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