并联式等安匝法在GTA现场误差校验中应用

Application of Parallel and Equal Ampere Turns Method on Field Error Calibration GTA

提出了一种新的针对百万千瓦以上超临界大型发电机出口电流互感器(GTA)现场误差校验的方法——并联式等安匝法。通过理论计算和磁场仿真,分析了并联式等安匝法与传统串联式等安匝法的特点。在大亚湾核电站一号机组GTA现场误差校验中,验证了此方法比传统的串联式等安匝法有更高的测量精度,同时就现场杂散磁通对二次测差回路影响进行了计算分析。

This article presents a new measuring method of errors of current transformer at the entrance in the large generator（GTA） ： parallel and equal ampere turns method.using theoretical calculations and magnetic field simulation,the article analyzed the characteristics of parallel method which different from the traditional serial method.By field checking errors of the No.1 generating Unit current transformer in Ling Ao nuclear power plant,we verify that the parallel and equal ampere turns method has higher accuracy than the traditional serial method.In addition,by simulation,this article analyzes the influent of the stray flux of the scene on the measuring accuracy of second test circuit.