连续方波脉冲下局部放电信号测量与绝缘老化分析

研制了连续脉冲电压下局部放电信号的测量系统，并对连续脉冲电压下绝缘老化特征参量进行研究。通过不同铁心材料传感器的频率响应特性和实际测量PD信号对比，认为NiZn铁心更适合用于脉冲电压下的PD传感器。在此基础上，定义了方波脉冲电压下局部放电信号的相对时间，得到放电谱图。最后，对样本老化时间和统计参量的关系进行了分析，认为偏斜度的变化和老化时间存在一定联系，而匝间绝缘和对地绝缘的不对称度随老化时间的增加表现出不同的特征。

Measurement for Partial Discharge and Analysis on Insulation Aging Under Continuous Square Pulse Voltage

A partial discharge(PD)signal measurement system is presented and the statistical characteristic of PD with aging time for twist pair is investigated under continuous square pulse voltage.According to comparison of responses of sensors made of different core material,the sensor made of the NiZn ferrite is more suitable for transferring PD signal under pulse voltage than that made of the MnZn ferrite.Based on that,a statistical method is discussed to obtain different statistical parameters and charts.Characteristics of statistical parameters with the aging time,have been analyzed.In particular,a relation between the aging time and skewness of specimens is observed,and kurtosis and asymmetry of specimens for interturn insulation and grounding insulation embody different characteristics.