电流互感器暂态仿真研究

在分析继电保护和综合自动化系统用的电流互感器铁心电磁特性的基础上，利用一个微小时间段上电流互感器励磁电流的变化量，建立了计及铁心非线性、局部磁滞及原始利用影响的电流互感器暂态仿真模型。开发了仿真计算程序，并利用该程序计算了电流互感器在电力系统三相短路故障时某相短路电流包含最大非周期分量情况下的暂态响应过程。仿真结果说明所作的电流互感器的暂态仿真能够准确地模拟电流互感器在暂态过程中的真实状况。

Research on Transient Simulation of CT

Basing on the nalysis on electromagenetic characteristic of CT iron-core used for relaying and combined auto-matic system and using the change quantity, of CT exciting current during a short time duration t, a tran-sient simulation model of CT is set up, which takes into consideration the core nonlinearity, Partial magenetic hys-teresis and original residual magenetism. We developed a simulation program and used it to calculate the transientresponse Process of Ct during a three-phase short-circuit fault of power system, in which the short-circuitcurrent of a phase includes maximum momperiodic component. Simulation results prove that the simulation modelcan accurately simulate the real case of CT transient.