温度对电缆附件界面缺陷处局放引发影响机制研究

doi:10.11930/j.issn.1004-9649.202010129

中国电力 ›› 2021, Vol. 54 ›› Issue (11): 181-189.DOI: 10.11930/j.issn.1004-9649.202010129

温度对电缆附件界面缺陷处局放引发影响机制研究

李巍巍¹, 朱轲¹, 邓元实¹, 王子康², 黄永禄², 周凯²

1. 国网四川省电力公司电力科学研究院, 四川成都 610072;
2. 四川大学电气工程学院, 四川成都 610065

收稿日期:2020-10-30 修回日期:2021-09-24 出版日期:2021-11-05 发布日期:2021-11-16
作者简介:李巍巍(1984-),女,高级工程师,从事电气设备状态监测评估,电力电缆击穿、老化及故障诊断技术等研究,E-mail:liweiwei0830@163.com;王子康(1998-),男,通信作者,硕士研究生,从事电缆绝缘状态与故障监测研究,E-mail:eilliton@foxmail.com
基金资助:
国家自然科学基金资助项目（51877142）；四川省电力公司科技项目（52199718001N）。

Influence of Temperature on Initiation Mechanism of Partial Discharge at the Interface Defects of Cable Accessories

LI Weiwei¹, ZHU Ke¹, DENG Yuanshi¹, WANG Zikang², HUANG Yonglu², ZHOU Kai²

1. State Grid Sichuan Electric Power Research Institute, Chengdu 610072, China;
2. College of Electrical Engineering, Sichuan University, Chengdu 610065, China

Received:2020-10-30 Revised:2021-09-24 Online:2021-11-05 Published:2021-11-16
Supported by:
This work is supported by the National Natural Science Foundation of China (No.51877142) and Science & Technology Project of State Grid Sichuan Electric Power Company (No.52199718001N).

摘要/Abstract

摘要： 温度对局部放电(partial discharge，PD)的发展过程有着重要的影响，但温度对PD的引发机制目前尚不明确。针对温度变化对电缆附件界面缺陷处PD引发机制进行研究。首先，对电缆附件界面单元与缺陷位置进行设计与仿真，并对界面单元不同温度下气隙缺陷PD特征进行测量。然后，搭建含有半导电层突起缺陷的电缆电热老化平台，通过电流通断模拟冷热负荷对电缆运行温度的影响。对界面单元和缺陷附件的局部放电起始电压（partial discharge inception voltage，PDIV）和PD相位谱图（phase resolved partial discharge，PRPD）进行对比分析，结果表明：随着测试温度的升高，界面单元的PDIV从8.3 kV降至6.9 kV，局部放电量有大幅提升，PRPD图显示出明显的内部放电特征。真实电缆附件缺陷处PD则会在温度快速上升时出现短暂的活跃，此时局部放电量与局部放电数都会出现明显增加，温度稳定后PD逐渐被抑制。上述现象主要与温度变化导致的界面处空间电荷分布和界面材料热胀冷缩所带来的“呼吸效应”有关，研究结果表明：真实电缆附件在大温度梯度下进行局放测试可提高局放检出率，为解决传统测试对局放检出可靠性不足提供了理论依据。

关键词: 电缆附件, 界面单元, 界面缺陷, 局部放电, 温度

Abstract: Temperature has an important influence on the partial discharge (PD) development, but the effect of temperature on the PD initiation mechanism is still not fully understood. Thus, this paper investigated the influence of temperature on the PD initiation mechanism at the interface defects of cable accessories. First, the interface unit and defects of cable accessories were designed and simulated, and the PD features of air-gap defects under different temperature were measured. Then, an electrothermal aging platform for cables with semi-conductive-layer protrusion defects was constructed, simulating the influence of cooling and heating loads on the operating temperature of cables through the on-off current. Afterward, the partial discharge inception voltage (PDIV) and the phase resolved partial discharge (PRPD) spectrum of samples were analyzed comparatively. Obtained results showed that, as the test temperature applied on the unit increased, PDIV would decrease from 8.3 kV to 6.9 kV accordingly, and the PRPD spectrum presented obvious internal discharge characteristics. Meanwhile, tests on the actual defects of the cable accessory showed that when the temperature rose quickly, the temporary PD excitation occurred and the number and amplitude of PD increased significantly. When the temperature was stabilized, however, the increment slowed down. The phenomenon can be interpreted through the space charge distribution of the interface due to temperature changes and the “breathing effect” caused by the thermal expansion and contraction of the interface material. The research reveals that PD signals in the interface defect are easier to be detected when cable accessories are operating under high temperature gradient, which may provide theoretical references for the unreliability of traditional PD detection.

Key words: cable accessory, interface unit, interface defect, PD, temperature

李巍巍, 朱轲, 邓元实, 王子康, 黄永禄, 周凯. 温度对电缆附件界面缺陷处局放引发影响机制研究[J]. 中国电力, 2021, 54(11): 181-189.

LI Weiwei, ZHU Ke, DENG Yuanshi, WANG Zikang, HUANG Yonglu, ZHOU Kai. Influence of Temperature on Initiation Mechanism of Partial Discharge at the Interface Defects of Cable Accessories[J]. Electric Power, 2021, 54(11): 181-189.

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温度对电缆附件界面缺陷处局放引发影响机制研究

Influence of Temperature on Initiation Mechanism of Partial Discharge at the Interface Defects of Cable Accessories

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Influence of Temperature on Initiation Mechanism of Partial Discharge at the Interface Defects of Cable Accessories

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