电子式直流电流互感器的热效应分析  

Analysis of Thermal Effect on Electronic Current Transformer Applied in HVDC

作　　者：徐雁[1] 肖霞[1] 叶妙元[1] 朱明钧[1] 张艳[2] 王建生[2] 郑军[2] 

机构地区：[1]华中科技大学电气与电子学院,湖北武汉430074 [2]西安高压电器研究所,陕西西安710077

出　　处：《高压电器》2008年第2期97-99,103,共4页High Voltage Apparatus

摘　　要：笔者介绍了用于高压直流电流测量的电子式直流电流互感器,针对其中决定测量结果的关键部分-分流器及一次联结导体,重点进行了热效应分析。理论分析得出:分流器自身和一次联结导体在直流大电流下都有热效应,而在高压直流线上谐波和阶跃响应产生的集肤效应还将导致不可忽视的附加热效应;一次联结导体的交、直流热效应共同作用将对分流器的测量产生影响。实验证明鼠笼结构的分流器可有效地抑制谐波电流的热效应,电子式直流电流互感器的热稳定性试验不宜用工频交流等效,只有采用实际直流才能真实可靠的反映其热稳定性能。The principle of electronic current transformer was described in this paper. For shunt and connecting conductor, thermal effect was analyzed. Theoretical analysis shows that shunt and connecting conductor have thermal effect in direct current, and skin effect in harmonic current would produce addition thermal. They may influence measurement result. Experiments proof that cage structure shunt can restrain the thermal effects of harmonic current effectively. Thermal stability test of electronic current transformer is inappropriate to use the frequency equivalent exchange. When the transformer works in direct current, its thermal stability is trued.

关 键 词：电子式电流互感器 分流器 热效应 集肤效应 温度 

分 类 号：TM452[电气工程—电器]