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高压电器  2015 

不同频率振荡波电压下XLPE电缆局部放电特性的研究

DOI: 10.13296/j.1001-1609.hva.2015.11.021, PP. 128-133

Keywords: 不同频率,振荡波电压,XLPE电缆,局部放电,模式识别

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Abstract:

振荡波检测技术在电力电缆局部放电检测中广泛应用。测试电缆长度不同导致振荡波电压频率发生变化。为了研究不同频率振荡波电压作用下电缆缺陷的局部放电特性,文中使用自主研发的振荡波测试系统检测了热缩式电缆附件在电缆终端无应力管、中间接头错用绝缘胶带替换半导电自黏胶带、交联聚乙烯主绝缘表面由割痕导致的气隙以及主绝缘表面存在金属微粒这4种缺陷的局部放电,对比分析了局部放电起始电压、熄灭电压、放电幅值、放电次数等特征随振荡波频率的变化情况,并对4种缺陷进行模式识别。分析结果表明,局部放电特性随振荡波频率变化而存在差异,4种缺陷的统计特征区分度较大,识别效果较好,具有实际应用价值。

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