交直流复合电压下油纸绝缘针板缺陷局部放电发展过程研究  

Study on Partial Discharge Development Processes of Needle-Plate Defects in Oil-Paper Insulation Under AC-DC Compound Voltage

作　　者：祝令瑜[1] 崔彦捷 李斯盟 熊庆[1] 薛鑫[1] 李金忠[3] 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [2]山东大学电气工程学院,济南250061 [3]中国电力科学研究院,北京100192

出　　处：《绝缘材料》2017年第7期55-60,共6页Insulating Materials

基　　金：中国电力科学研究院项目(GY71-14-004)

摘　　要：通过搭建一套交直流复合电压油纸绝缘针板缺陷局部放电试验平台,对交直流复合电压下油纸绝缘针板缺陷局部放电发展过程中的局部放电参数及谱图变化进行研究分析。结果表明:根据局放特征参数随时间的变化规律,局放发展过程可分为起始阶段、发展阶段、严重阶段及预击穿阶段。平均周期放电次数在发展阶段与严重阶段增加,在预击穿阶段减少;平均放电幅值在发展阶段增加,在严重阶段与预击穿阶段下降,脉冲平均等效时间与频率在严重阶段与预击穿阶段呈现相反的变化趋势。局放特征谱图的形状变化规律可成为识别局放发展阶段的重要依据。A partial discharge （PD） test platform was built, and the variation of PD parameters and spec- trogram in development processes of needle-plate defects in oil-paper insulation under AC-DC compound voltage was studied. The results show that according to the variation trend of PD characteristic parame- ters with time, PD development processes can be divided into initial stage, developing stage, serious stage, and pre-breakdown stage. The mean PD number in a cycle increases in developing stage and seri- ous stage, and decreases in pre-breakdown stage. The mean PD amplitude increases in developing stage, and decreases in serious stage and pre-breakdown stage. The mean equivalent time and frequency show the opposite variation trend in serious stage and pre-breakdown stage. The change law of PD charateristic spectrogram proves to be the important reference for recognizing the PD development stages.

关 键 词：交直流复合电压 油纸绝缘 等效时频特性 局部放电 针板电极 阶段划分 

分 类 号：TM855[电气工程—高电压与绝缘技术]