特高压变压器高压出线装置长时工频耐压下绝缘性能试验研究  

Research on the Insulation Performance for High Voltage Lead Exit of Ultra-high Voltage Transformers Under Long Duration Power Frequency Withstand Voltage

作　　者：李金忠[1] 孙建涛[1] 张书琦[1] 刘锐[1] 汤浩[1] 王健一[1] 孙倩[1] 吴超[1] 邓俊宇[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192

出　　处：《中国电机工程学报》2012年第34期151-157,22,共7页Proceedings of the CSEE

摘　　要：根据油纸绝缘的V-t特性,制定了特高压出线装置长时工频耐压试验方案,提出以出线装置在10h,m1.5U/3工频电压下的绝缘特性衡量出线装置的绝缘裕度。设计了特高压出线装置绝缘裕度试验系统,实现了出线装置脱离变压器或电抗器实体进行电气试验的目的。试验以局部放电为特征量,研究特高压出线装置在长时工频电压作用下的电气性能。结合两种局放测量的接线方式检测局放信号,并对局放回路进行分析,提出了区分局放产生的部位的方法,排除套管局放对系统局放结果判断的干扰。试验结果表明国产特高压出线装置在长时工频电压作用下无局放,绝缘性能良好。The test scheme was established according to the V-t characteristic of oil-filled transformer insulation.The long-term insulation property under the 10-hour and power frequency voltage was proposed as the test condition to evaluate the insulation margin of UHV lead exit.The insulation margin test system was designed and manufactured,which allows the lead exit to be tested independently from the transformer or reactor.The partial discharge（PD） level was taken as the characteristic parameter to study the electrical performance of the lead exit under long duration voltage.The two connection mode of PD test circuit was adopted.Based on the analysis of PD circuit,a method of distinguishing the PD position was presented to exclude the interference of bushing PD so as to accurately evaluate the test result.The test result shows that the self-developed UHV AC lead exit in China has good insulation performance without any partial discharge under the long duration power frequency withstand voltage.

关 键 词：特高压 变压器 出线装置 绝缘裕度 局部放电 长时工频耐压 V-t特性 

分 类 号：TM85[电气工程—高电压与绝缘技术]