摘要
采用电磁检测方法借助重复脉冲电压参数可调的高压脉冲电源构建脉冲电压下的绝缘局部放电检测平台,研究重复方波电压的频率变化对变频电机单点和多点匝间绝缘放电模型局部放电统计特性的影响规律。结果表明:随着频率增加,绝缘单点和多点放电幅值均显著减小,这可能是由放电后绝缘表面残留电荷分布特性发生改变、激发初始电子概率增加及表面温升增加等综合因素引起。根据研究结果,在进行电机绝缘放电检测时应仔细考虑方波脉冲电压频率对局部放电脉冲的影响,选择合适的电压频率以提升测试灵敏度和准确性。
A detection platform of insulation partial discharge(PD)under pulse voltage was constructed by using electromagnetic detection method with the help of a high-voltage pulse power source with adjustable voltage parameters of repetitive pulse.The influence law of frequency variation of repetitive square wave voltage on the PD statistical characteristics of single point and multipoint interturn insulation discharge model for inverter-fed motor was studied.The results show that with the increase of frequency,the amplitude of both insulation single point and multipoint discharge decrease significantly.This may be caused by composite factors such as the change of residual charge distribution on insulation surface,the increase of the excitation probability of initial electron,and the increase of surface temperature after discharge.According to the research results,the influence of square wave pulse voltage frequency on the PD pulse should be carefully considered in the PD detection of motor insulation,and the appropriate voltage frequency should be selected to improve the sensitivity and test accuracy.
作者
周进
王鹏
马世金
ZHOU Jin;WANG Peng;MA Shijin(Dongfang Electric Machinery Co.,Ltd.,Deyang 618000,China;College of Electrical Engineering,Sichuan University,Chengdu 610065,China)
出处
《绝缘材料》
CAS
北大核心
2021年第7期88-94,共7页
Insulating Materials
基金
国家自然科学基金资助项目(51977134)。
关键词
变频电机
匝间绝缘
局部放电
重复方波
频率
variable frequency motor
interturn insulation
partial discharge
repetitive square wave
frequency
