基于规化求解法的电流互感器仿真

电流互感器饱和问题一直是影响保护正确动作的关键问题,所以需要对电流互感器饱和情况进行深入的研究,分析二次电流波形。选用一种拟合直流磁化曲线的数学函数,运用规化求解的方法建立电流互感器的仿真模型,并据此比较不同性质的二次负荷、剩磁和磁滞效应对电流互感器传变的影响,分析这些传变对继电保护的危害。所提出的规化求解法方便地解决了铁磁非线性仿真问题。

Simulation of current transformer based on gauge solution

The saturation of CT has great influence on the performance of the protection.To ensure the relaying protections operating correctly under transient saturation circumstance,it is necessary to make deep research on the saturation characteristics of CT and analyze the saturated current shape.By selecting a mathematical function of fitting cocurrent magnetization curve and using gauge solution, the paper establishes a simulation model of current transformer. Based on the model, the paper makes the comparison on transformer characteristics of current transformer with different load, residual flux and hysteresis, analyzes hazards to relay protection with these transformer characteristics. Gauge solution method the paper proposed is an easy way to solute ferromagnetic non-linearity circuit simulation.