由悬浮放电引发的绝缘放电缺陷带电检测及局放源定位分析
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摘要
针对1起由穿心电流互感器等电位屏蔽悬浮放电引发的绝缘放电缺陷进行了局放图谱定性分析和局放源精确定位。在此基础上,经设备停电检查,确认该柜内穿心电流互感器等电位屏蔽为金属铜带,粘于穿心电流互感器内表面,等电位屏蔽与电流互感器内表面间存在气隙,属设计缺陷。该缺陷导致穿心电流互感器运行中产生局部放电,给设备的安全稳定运行带来了隐患。
In this paper, the qualitative analysis of PD pattern and accurate localization of PD source were carried out for an insulating discharge defect caused by isopotential shielded suspension discharge of current transformer. On this basis, through the power failure inspection of equipment, it was confirmed that the current transformer equipotential shielding was made of metal copper tape and adhered to the inner surface of current transformer. There was air gap between the equipotential shielding and the current transformer inner surface, which was a design defect. This defect led to partial discharge during the operation of through-the-cabinet current transformer, which brought hidden trouble to the safe and stable operation of the equipment.
In this paper, the qualitative analysis of PD pattern and accurate localization of PD source were carried out for an insulating discharge defect caused by isopotential shielded suspension discharge of current transformer. On this basis, through the power failure inspection of equipment, it was confirmed that the current transformer equipotential shielding was made of metal copper tape and adhered to the inner surface of current transformer. There was air gap between the equipotential shielding and the current transformer inner surface, which was a design defect. This defect led to partial discharge during the operation of through-the-cabinet current transformer, which brought hidden trouble to the safe and stable operation of the equipment.
引文
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[6]李海德.基于TEV与超声波的高压开关柜局部放电检测方法研究[D].北京:华北电力大学,2013.
[7]曹飞翔.基于TEV、超声波联合检测的开关柜局部放电诊断研究[D].北京:华北电力大学,2017.
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[10]丁薇,彭晶,宁威.一起35 kV开关柜典型故障的局放带电检测及原因分析[J].云南电力技术,2016,44(3):92-95.
[2] Wensheng G, Weidong Liu. Propagation Attenuation Properties of Partial Discharge in Typical In-Field GIS Strutaures[J]. IEEE Transataions on power delivery,2014, 28(4):2540-2549.
[3] Wang H, Huang C J, et al.On-line partial discharge monitoring system and data processing using WTST-NST filter for high voltage power cable[J].WSEAS Transataions on Circuits and Systems, 2009, 8(7):609-619.
[4]王辉,黄成军,姚林朋,等.利用重排分布理论的GIS局放信号时频分析[J].高电压技术,2010,36(9):2236-2241.
[5]张灿华.基于特高频、超声波、TEV局部放电检测技术的应用及研究[D].济南:山东大学,2015.
[6]李海德.基于TEV与超声波的高压开关柜局部放电检测方法研究[D].北京:华北电力大学,2013.
[7]曹飞翔.基于TEV、超声波联合检测的开关柜局部放电诊断研究[D].北京:华北电力大学,2017.
[8]王流火,吕鸿,王增彬,等.开关柜局部放电检测技术的应用研究[J].广东电力,2014,27(4):91-94.
[9]黄世龙,王晓辉,郭旭敏,等.采用TEV传感器的开关柜局部放电检测技术研究与实现[J].高压电器,2016,52(10):19-26.
[10]丁薇,彭晶,宁威.一起35 kV开关柜典型故障的局放带电检测及原因分析[J].云南电力技术,2016,44(3):92-95.