特高压换流站站用电保护定值整定方案分析

Analysis of Power Protection Setting Scheme for UHV Converter Station

针对站用电系统保护跳闸故障,结合中州站站用电系统的典型配置,重点分析了换流站站用电系统继电保护定值整定工作中保护用电流互感器变比、保护功能选配问题,对互感器变比及精度选择、复压过流、备自投闭锁配置原则进行了分析,同时根据换流站站用电系统实际情况,对站用电系统10 kV进线开关保护、复压过流配置,备自投实现方式以及电流互感器准确级、变比选择等问题,给出了今后特高压直流工程站用电系统的设计建议和方案。

Aiming at the protection tripping failure of station power system,combined with the typical configuration of Zhongzhou station power system,this paper analyzes the station power system relay protection setting value setting work than become with current transformer protection,protection function matching problem,change ratio and accuracy of transformer selection,after pressure flow and prepare the cast locked-in configuration principle is analyzed.At the same time,according to the actual situation of the station power system of the converter station,the design suggestions and schemes of the station power system of the UHVDC engineering in the future are given for the protection of the 10 kV incoming line switch,the configuration of the complex voltage overcurrent,the realization mode of the standby self-switching,and the selection of the accurate grade and variable ratio of the current transformer.