Development and Application of Measurement Device for DC Partial Discharge

doi:10.11930/j.issn.10.11930.2015.4.76

Abstract

Abstract: With the development of UHVDC transmission engineering in China, the safety and reliability of such electrical equipment as converter transformer is particularly important. DC partial discharge is a prominent indicator of insulation defects, and its test can help prevent dielectric breakdown of DC power transmission equipment. Based on the DC partial discharge principle, a DC partial discharge test system was established to monitor the insulation status of converter transformers. Characterized by strong anti-interference ability, and high-speed, persistent and real-time capability in data acquisition, the proposed system can record the DC partial discharge signal efficiently and entirely. The system’s performance was verified through a typical oil-paper compound insulation model. The practical results show that the proposed system can effectively and conveniently measure the DC partial discharge time-domain signal of oil-paper insulation. Time-frequency analysis and statistical analysis of DC partial discharge signal indicates that the statistical characteristic parameters in the model of same electrodes varies significantly with time and can be used to forecast the severity caused by partial discharge, and the the statistical characteristic parameters in the model of different electrodes have the similar distribution tendency and can be used to estimate the defect types. The measuring systemt is expected to be implemented widely in testing DC power transmission devices in China.

Key words: DC partial discharge, anti-interferenc capability, software and hardware design, oil-paper insulation, time-frequency analysis, statistical analysis, defect type, severity

CLC Number:

TM214

SHA Yanchao, ZHOU Yuanxiang, NIE Dexin, DENG Jiangang, LIU Zehong, LU Licheng. Development and Application of Measurement Device for DC Partial Discharge[J]. Electric Power, 2015, 48(4): 76-82.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.10.11930.2015.4.76

https://www.electricpower.com.cn/EN/Y2015/V48/I4/76

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