±800 kV换流站直流断路器内置光学电流互感器方案研究

Research on Configuration Scheme of Optical Current Transformer in DC Breaker of±800 kV Converter Station

针对±800 kV换流站直流断路器内光学电流互感器(OCT)配置方案,简述了OCT原理并以送端换流站为例,详述了其配置方案,为配合换流站直流保护系统的三重化,同时考虑冗余1套备用,每台OCT共配置4个光纤传感环及4个采集单元,最后指出应用OCT注意事项,包括不要拉拽这些光纤光缆,OCT安装到位后不要随意拆卸或改变,处理与OCT二次采集单元或合并单元等装置连接的通信光纤时,避免其弯折或弯曲半径过小等,建议直接将直流断路器OCT测量接口屏通过尾缆接至极测量接口屏和阀组测量接口屏,不通过其他屏转接信息,减少中间环节。

According to the configuration scheme of optical current transformer(OCT)in DC circuit breaker of±800,kV converter station,the principle of OCT is briefly described.Taking the converter station at the sending end as an example,the configuration scheme is introduced.In order to coordinate with the tripling of DC protection system in converter station,one set of redundant standby is considered.Each OCT is equipped with 4 optical fiber sensing rings and 4 acquisition units.Finally,it points out the precautions in the application of OCT,including not pulling these optical fibers and cables,not dismantling or changing them at will after installing OCT in place,and avoiding bending or too small bending radius when processing communication optical fibers connected with OCT secondary acquisition unit or merging unit.It is suggested that the OCT measurement interface panel of DC circuit breaker be directly connected to the pole measurement interface panel and valve group measurement interface panel through the cable tail,without transferring information through other screens,so as to reduce the intermediate links.