智能变电站电流互感器极性配置的研究

Discussion on Polar Wiring Method of Current Transformers in Smart Substation

阐述了智能变电站电流互感器的正极性接法与反极性接法;讨论智能变电站常规互感器加合并单元接线形式的二次回路原理;通过对比常规变电站和智能变电站电流互感器的典型配置,分别描述线路保护、母线保护以及变压器保护原理,并解释当电流互感器的电流同时供给两个保护装置时,电流互感器的极性如何配置。

This paper elaborated methods of both positive wiring and the negative wiring of current transformers （CTs） in smart substation ; discussed the principle of the secondary circuit according to the connection form of ＇ Cir- cuit Transformer ＋ Merging Unit＇ in digitized substation. By comparing the typical structures of conventional substa- tion and smart substation, the principles of transmission line protection, bus bar protection and power transformer pro- tection were described respectively. It is significant to how to apply the polar wiring of CTs when one CT supplies current for two protection devices.