智能变电站3/2接线方式中电流互感器配置分析

针对“通用设计”中 330 kV 变电站电流互感器的配置方案存在保护死区的问题,通过分析电流互感器的工作特性,提出在 1 个半断路器接线(3/2 接线)方式中,增加电流互感器绕组数量和主变压器保护采用 TPY 级电流互感器等项改进措施。结果表明:改进措施能够有效防止事故范围进一步扩大,保障电网安全稳定运行,减少电网企业和用户的经济损失。

Configuration analysis of current transformer in 3/2 connection mode of smart substation

Aiming at the problem of protection blind area existing in configuration schemes ofcurrent transformer of 330 kV substation in general design,by analyzing the characteristics ofcurrent transformer,puts forward improvement measures such as to increase number of currenttransformer winding,adopt TPY level current transformer for the main transformer protection in oneand a half circuit breaker connection (3/2 connection) mode,etc. The result shows that theimprovement measures can effectively prevent the accident scope spreading,guarantee the powergrid safe and reliable operation,reduce economic loss of power grid enterprises and customers.