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DC voltage discharge oil-paper insulation model of the development process

Author: YangBo
Tutor: LiChengZuo
School: North China Electric Power University (Beijing)
Course: High Voltage and Insulation Technology
Keywords: Oil-paper insulation DCPD UHF Pulse Current Equivalent time-frequency transform
CLC: TM855
Type: Master's thesis
Year: 2010
Downloads: 166
Quote: 3
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Abstract


Existing DC voltage partial discharge measurement method is not perfect , the lack of diagnostic criteria. Therefore, the study DC voltage partial discharge characteristics and discharge process can provide the basis for the discharge of diagnostic methods . We build a DC voltage oil-paper insulation partial discharge simulation systems, including discharge model , partial discharge signal detection system and the partial discharge data acquisition system. Combined method and the constant voltage boost method experimentally investigated at a constant temperature discharge discharge model , development, until the breakdown process. UHF method using conventional pulse current law and wideband pulse current method real-time measurement of the discharge in the development process of partial discharge signals , analyzes DC voltage discharge of oil-paper insulation model development process. The observed phenomenon shows : DC partial discharge frequency is very low , occasional tufted discharge ; outer applied voltage is changed, the partial discharge phenomenon will be significantly increased, then weakened . The results show that: with the development of discharge , discharge, average discharge amount , the maximum discharge volume and little change in the total discharge volume , it is difficult to identify the characteristics of the discharge phase ; broadband TF current signal spectrum can give some partial discharge type.

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CLC: > Industrial Technology > Electrotechnical > High Voltage Engineering > High - voltage insulation technology > Insulation test and inspection
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