摘要
空间电荷现象在电气绝缘破坏中起着重要作用,但多年以来对空间电荷的研究主要集中于直流电压下,而针对方波电压下空间电荷的研究较少。为此对传统的电声脉冲法(pulsed electro-acoustic method,PEA)进行改进,可以同时向试样施加可调相位差的方波电压和脉冲电压,并利用该装置研究了不同波形参数(波形、极性、频率、占空比等)对空间电荷分布的影响。实验结果表明:方波电压下更易积累同极性电荷,单极性方波下的空间电荷积累远大于双极性方波,高频方波下空间电荷积累更为严重,占空比的增加也会导致积累电荷量的增加。
Space charge phenomena play an important role in dielectric breakdown,and most studies have focused on space charge accumulation characteristic under DC voltage;however,few studies have focused on space charge under square voltage.Consequently,we improved the traditional pulsed electroacoustic method(PEA)to present a new method for space charge measurement under square wave voltage.Using this method,we can measure the space charge distribution under square waveform of various waveform parameters(polarity,frequency,duty ratio,etc.).From the measurement result,it is found that homo-charge is more likely to accumulate under square wave voltage,and the space charge accumulation under unipolar square wave is much larger than that of bipolar square wave.Furthermore,a high frequency square wave will cause more serious charge accumulation,and an increase in the duty cycle will also result in an increase in the amount of accumulated charge.
作者
王霞
舒子航
段胜杰
王华楠
吴锴
WANG Xia;SHU Zihang;DUAN Shengjie;WANG Huanan;WU Kai(State Key Laboratory of Electric Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2020年第2期634-639,共6页
High Voltage Engineering
基金
国家重点研发计划(2016YFB0900700).
关键词
空间电荷
方波
电声脉冲法
频率
占空比
space charge
square wave
pulsed electroacoustic method
frequency
duty ratio
