基于脉冲特征参量表征划伤的XLPE电缆终端局部放电特性

项恩新; 王科; 邢立勐; 徐肖伟; 黄继盛; 李丽妮

项恩新,王科,邢立勐,徐肖伟,黄继盛,李丽妮.基于脉冲特征参量表征划伤的XLPE电缆终端局部放电特性[J].电测与仪表,2021,58(8):125-131.
XIANG Enxin,WANG Ke,XING Limeng,XU Xiaowei,HUANG Jisheng,LI lini.Characterization of Scratched XLPE Cable Terminals Based on Pulse Characteristic Parameters Partial discharge characteristics[J].Electrical Measurement & Instrumentation,2021,58(8):125-131.

基于脉冲特征参量表征划伤的XLPE电缆终端局部放电特性

Characterization of Scratched XLPE Cable Terminals Based on Pulse Characteristic Parameters Partial discharge characteristics

DOI：10.19753/j.issn1001-1390.2021.08.017

中文关键词: 划伤放电脉冲特征参量差异度功率谱

英文关键词:Scratch discharge pulse characteristic parameter difference degree power spectrum

基金项目:四川省科技计划项目（青年科技创新研究团队项目）（2020JDTD0009）

作者中文名	作者英文名	单位
项恩新	XIANG Enxin	云南电网有限责任公司电力科学研究院昆明
王科	WANG Ke	云南电网有限责任公司电力科学研究院昆明
邢立勐	XING Limeng	西南交通大学电气工程学院成都
徐肖伟	XU Xiaowei	云南电网有限责任公司电力科学研究院昆明
黄继盛	HUANG Jisheng	云南电网有限责任公司临沧供电局临沧
李丽妮	LI lini	西南交通大学电气工程学院成都

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中文摘要:

安装电缆终端附件时锋利的刀具使主绝缘留下划痕更易引发放电,对电网的安全运行造成隐患。本文在10kV下对距离截断层10mm、30mm、50mm和70mm含纵切划伤的XLPE电缆进行局部放电试验。提取放电脉冲波形并对各缺陷电缆的放电脉冲分析,分析脉冲正负波形的下降时间Tr+ 、Tr-、上升时间Tf+ 、Tf-、宽度Tw+、Tw-、持续时间Tl 、峰值绝对值p等特征量及其差异度。另外,对研究了各脉冲功率谱作归一化研究。研究结果表明,随着划伤远离截断层,正半周的放电脉冲向右偏移并且与负半周脉冲距离减小； Tr-、Tf+ 、Tw+、Tl 和p能更好地体现划伤位置及放电程度；随划伤与截断层距离增加,放电脉冲功率谱形状由“上窄下宽”向“上下较窄”演变。根据脉冲的特征参量分析局部放电特性,可为识别划伤位置及严重程度提供依据。

英文摘要:

When installing the cable terminal accessory, the sharp tool makes the main insulation leave scratches and is more likely to cause dis-charge, which poses a hidden danger to the safe operation of the power grid. In this paper, partial discharge tests were carried out on 10 cm, 10 mm, 30 mm, 50 mm and 70 mm XLPE cables with slitting scratches at 10 kV. Extract the discharge pulse waveform and analyze the discharge pulse of each defective cable, and analyze the falling time of the positive and negative pulse waveforms Tr+, Tr-, rise time Tf+, Tf-, width Tw+, Tw-, duration Tl, peak absolute value p, etc. Quantity and its difference. In addition, the normalization study of each pulse power spectrum was studied. The results show that as the scratch is away from the cut-off layer, the discharge pulse of the posi-tive half cycle shifts to the right and the pulse distance from the negative half cycle decreases; Tr-, Tf+, Tw+, Tl and p can better reflect the scratch position and discharge degree; as the distance between the scratch and the cut-off layer increases, the shape of the discharge pulse power spectrum evolves from "upper narrow and lower" to "narrower ics based on the characteristic parameters of the pulse can provide a basis for identifying the location and severity of the scratch.

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