摘要
在分析各种抗干扰措施的基础上,研究了小波分析及极性鉴别抗干扰技术在电缆接头局部放电检测中的应用,提出了以频谱分析、小波分析、设定阈值、极性鉴别为主,以相位开窗、时延鉴别等手段为辅的抗干扰方法,并通过对信号进行频谱分析,判断信号是否需要开相位窗,选用数字滤波和小波分析,最后经极性鉴别和时延鉴别的流程来进行电缆接头的局部放电测试。实验室和现场数据综合分析表明,该方法和流程适合在实验室和现场条件下进行交联聚乙烯绝缘电缆(cross-linked polyethylene insulated cable,XLPE)接头的局部放电测试。
Upon analysis of various anti-interference measures, the application of wavelet analysis and polarity discrimination to anti-interference of partial discharge（PD） detection for cable joints is studied. An anti-interference method is proposed, which is mainly based on spectrum analysis, wavelet analysis, threshold setting, polarity discrimination, and supplemented by such means as phase window and time-delay discrimination. Spectrum analysis of signal is made to judge whether the phase window is necessitated; digital filtering and wavelet analysis are chosen, followed by polarity discrimination and time- delay discrimination, thereby realizing PD detection for cable joints. Comprehensive analysis of laboratory and on-site data shows that the proposed method and procedure are suitable for PD detection of cross-linked polyethylene insulated cable （XLPE cable） joints both in laboratory and on site.
出处
《广东电力》
2010年第3期54-59,75,共7页
Guangdong Electric Power
关键词
电力电缆接头
局部放电
在线检测
抗干扰技术
power cable joint
partial discharge（PD）
on-line detection
anti-interference
