直流预压时间对直流叠加冲击电压下XLPE中电树枝引发特性的影响  

Effect of DC Pre-stress Time on Initiation Characteristics of Electrical Tree in XLPE Under DC Superimposed Impulse Voltage

作　　者：刘贺晨[1] 徐晓彬 刘云鹏[1,2] 蒙绍新 郭展鹏 张铭嘉 LIU Hechen;XU Xiaobin;LIU Yu npeng;MENG Shaoxin;GUO Zhanpeng;ZHANG Mingjia(Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense,North China Electric Power University,Baoding 071003,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;State Key Laboratory of Power Grid Environmental Protection,China Electric Power Research Institute,Wuhan 430074,China)

机构地区：[1]华北电力大学河北省输变电设备安全防御重点实验室,保定071003 [2]华北电力大学新能源电力系统国家重点实验室,北京102206 [3]中国电力科学研究院有限公司电网环境保护国家重点实验室,武汉430074

出　　处：《高电压技术》2021年第2期671-678,共8页High Voltage Engineering

基　　金：电网环境保护国家重点实验室开发基金(GYW51201901087);河北省自然科学基金(E2018502133);中央高校基本科研业务费专项资金(2018MS079);国家重点研发计划(2016YFB0900705)。

摘　　要：为探究直流预压时间对直流叠加冲击电压下电树枝引发特性的影响,在幅值为0、±10 kV预压时间为1、10、60、180min的直流偏置电压下分别叠加±50k V的雷电冲击电压。此外,利用双极性载流子输运模型对复合电压下针尖附近空间电荷及电场分布进行了仿真分析。试验及仿真结果指出,随着直流电压作用时间的增加,复合电压下的电树枝引发长度逐渐增加,介质内部空间电荷浓度及分布范围有所增加,且复合电压下电树枝引发长度与空间电荷浓度、注入深度以及流注发展过程有关。复合电压作用下电树枝引发长度以及直流电压下空间电荷分布特性与所加电压的极性存在紧密联系,正极性冲击电压下电树枝引发长度明显大于负极性;当直流预压时间及幅值相同时,负极性直流预压下空间电荷浓度及分布范围均大于正极性。In order to study the influence of DC pre-stress time on the characteristics of electrical tree initiation under DC superimposed impulse voltage,±50 kV lightning impulse voltage is superimposed to DC bias voltage with amplitude of 0 k V,±10 kV pre-stress time of 1 min,10 min,60 min and 180 min,respectively.In addition,the bipolar charge transport model is used to simulate the space charge and electric field distribution near the needle tip under composite voltage.The results show that,with increasing DC pre-stress time,the electrical tree initiation length increases gradually under a DC superimposed impulse voltage,and the concentration and distribution range of space charge increase.Moreover,the initiation length of electrical tree is related to the concentration of space charges,injection depth of space charges,and the development process of streamer.The results show that the electrical tree initiation length under the composite voltage and the space charge distribution under the DC pre-stress have an obvious polarity effect.The electrical tree initiation length under the positive impulse voltage is significantly longer than that under the negative.When the DC pre-stress time and amplitude are the same,the space charge concentration and distribution range of negative DC pre-stress are larger than those of positive DC pre-stress.

关 键 词：直流叠加冲击电压 电树枝引发特性 空间电荷仿真 极性效应 交联聚乙烯 

分 类 号：TM247[一般工业技术—材料科学与工程]