中文说明：本文提出了局部的非线性模型，准确地代表的非线性饱和特性的一种电流互感器 （CT）。基于该模型，二次电流的饱和的部分以及不饱和部分可用于在回归过程中估计模型参数。饱和的段通常在于附近断层的成立，因此准确的参数，可获得更快相比使用仅不饱和的部分的方法。故障前剩余磁通和直流偏置，这可以显著影响电流互感器饱和，被认为在模型中，因此他们不会影响参数估计的精度。回归计算，计算量大大减少使用可分离非线性最小二乘法 （SNLLS）。这提供了实现该方法对实时的继电保护装置的可行性。该方法的性能大都在语言 PSCAD/EMTDC 仿真和现场录音与克拉一个测试获得的数据该方法还实施了在现场可编程门阵列 （FPGA）。
English Description：
This paper proposes a partial nonlinear model to accurately represent the nonlinear saturation characteristic of a current transformer (CT). Based on the model, the saturated section of the secondary current as well as the unsaturated section can be used in a regression process to estimate model parameters. The saturated section normally lies near the inception of a fault, therefore accurate parameters can be obtained faster compared with the methods using only unsaturated sections. The pre-fault remanent flux and DC-offset, which could significantly influence CT saturation, are both considered in the model, thus they do not affect the accuracy of the parameter estimation. The computational load of the regression calculation is significantly reduced by using separable nonlinear least squares (SNLLS) method. This provides the feasibility to implement the method for real-time protective relaying. The performance of the