核电厂辅助变压器进线回路断相监测方案研究  

Study on the Open Phase Monitoring Scheme of the Incoming Circuit of the Auxiliary Transformer in Nuclear Power Plant

作　　者：魏巍 陈海龙 WEI Wei;CHEN Hailong(Hualong Nuclear Power Technology Co.,Ltd.Beijing 100037,China;XJ Electric Co.,Ltd.,Xuchang of Henan Prov.461000,China)

机构地区：[1]华龙国际核电技术有限公司,北京100037 [2]许继电气股份有限公司,河南许昌461000

出　　处：《核科学与工程》2023年第3期601-612,共12页Nuclear Science and Engineering

摘　　要：辅助变压器回路的断相故障监测是核电厂中最为关心的问题之一。断相故障可能会引起核电厂厂用电系统出现异常工况,例如母线电压不平衡、运行的设备跳闸、备用设备无法启动等。若核电厂在正常运行方式下,辅助变压器回路高压侧未能及时检测到断相故障,一旦发电机母线失去电压需切换至厂外辅助电源供电,可能会导致关键的电动机跳闸,甚至是系统安全功能丧失,以致核电厂不能安全停堆。本文针对国内常用的辅助变压器方案提出了两种监测断相故障的方案,通过对断相监测方案的分析,并运用PSCAD/EMTDC软件建模仿真,分析出两种方案的特点,得出在针对核电厂不同的辅助变压器方案时,如何选择断相监测方案才能更准确、更有效的识别出断相故障。Open phase failure monitoring in auxiliary transformer circuits is one of the most concerned issues in nuclear power plant.Open phase failure may cause abnormal conditions of the power system in a nuclear power plant,such as unbalanced bus voltage,tripping of operating equipment,failure of standby equipment to start,etc.If the high-voltage side of the auxiliary transformer circuit fails to detect the open phase failure in time under the normal operation mode of the nuclear power plant,once the generator bus loses voltage,it is necessary to switch to the auxiliary power supply outside the plant,which may lead to the tripping of key motors and even the loss of system safety function,so that the nuclear power plant cannot be shut down safely.Aiming at the commonly used auxiliary transformer schemes in China,this paper puts forward two schemes of monitoring open phase failure.Through the analysis of the open phase monitoring scheme,and using PSCAD/EMTDC software modeling and simulation,this paper analyzes the characteristics of two schemes,and obtains how to select the open phase monitoring method for different auxiliary transformer schemes of nuclear power plant in order to identify the open phase failure more accurately and effectively.

关 键 词：核电厂 辅助变压器 断相故障 监测方法 

分 类 号：TL48[核科学技术—核技术及应用]