励磁变压器CT参数核算与选型设计

CT Parameter Accounting and Type Selection Design of Excitation Transformer

通过计算秦一厂主系统和励磁变参数,对系统进行等效处理和网络变换,在此基础上展开参数核算和设备选型,并根据参数核算进行现场二次电缆线径的调整和确认,现场结果表明,励磁变压器CT选型及核算保证了秦一厂OLE项目励磁变CT对系统的适用性,保障了保护测量的准确性,提高了CT抗饱和能力。

Based on the calculation of the parameters of the main system and the excitation transformer in Qinshan NPP,the equivalent treatment and network upgrading of the system are carried out.On this basis,the rated current and the secondary capacity of the CT are selected.Finally,the cable diameter of the secondary cable is adjusted and confirmed according to the parameter calculation.The field results show that the selection of the excitation transformer,and calculation of the CT of the voltage transformer ensure the applicability of the CT of the excitation transformer to the system,the accuracy of the protection measurement,and the anti saturation ability of the CT.