典型油纸绝缘缺陷在直流脉动电压下的局部放电特性  

Partial discharge characteristics of typical oil-paper insulation defects under DC pulsating voltage

作　　者：李渊 吴对平 李子彬 曲全磊 李生龙 丁宏伟 张轩瑞 LI Yuan;WU Duiping;LI Zibin;QU Quanlei;LI Shenglong;DING Hongwei;ZHANG Xuanrui(State Grid Qinghai Electric Power Research Institute,Xining 810008,China;State Grid Qinghai Electric Power Company,Xining 810008,China;School of Electrical Engineering,Xi′an Jiaotong University,Xi′an 710049,China)

机构地区：[1]国网青海省电力公司电力科学研究院,青海西宁810008 [2]国网青海省电力公司,青海西宁810008 [3]西安交通大学电气工程学院,陕西西安710049

出　　处：《绝缘材料》2025年第4期90-98,共9页Insulating Materials

摘　　要：换流变压器是高压直流输电系统的关键设备,其阀侧绕组在运行过程中承受复杂的复合电压波形,现有研究主要集中在单一电压形式或交直流复合电压下的局部放电特性。由于换流阀等电力电子器件的影响,换流变压器还会承受脉动电压。本文结合实际运行工况,研究正极性直流脉动电压对油纸绝缘局部放电的影响,获得油中尖端放电和油纸板沿面放电两种典型油纸绝缘缺陷在直流脉动电压下的局部放电特性。结果表明:直流分量只会改变局部放电的频次和幅值,对两类缺陷局部放电的影响规律相同;随着脉动分量的增大,两类缺陷的放电脉冲逐渐增多,形成脉冲簇并表现出明显的极性效应,油中尖端放电的脉冲簇集中在上升沿,而油纸板沿面放电的脉冲簇则集中在下降沿。Converter transformer is the key equipment in high-voltage direct current(HVDC)transmission system,and its valve-side windings are subjected to complex composite voltage waveforms during operation.The existing researches primarily focus on partial discharge characteristics under single voltage form or AC-DC composite voltages.However,due to the influence of power electronic devices such as converter valves,converter transformers also endure pulsating voltages.In this paper,the impact of positive polarity DC pulsating voltage on partial discharge of oil-paper insulation under actual operating conditions was studied,and the partial discharge characteristics of two typical oil-paper insulation defects,needle tips discharge in oil and surface discharges on oil-paper boards,were obtained under DC pulsating voltage.The results show that the DC component only changes the frequency and amplitude of partial discharge,and has same effect on the two types of defects.As the amplitude of the pulsating component increases,the discharge pulses of the two types of defects increase gradually,forming pulse clusters and exhibiting significant polarity effects.The pulse clusters for needle tips discharge in oil are concentrated on the rising edge,while those for surface discharges on oil-paper boards are concentrated on the falling edge.

关 键 词：油纸绝缘 局部放电 复合电压 换流变压器 

分 类 号：TM411[电气工程—电器]