用于铁磁谐振过电压计算的电压互感器模型

根据电磁式电压互感器(PT)等效电路模型的特点,首先给出了PT的等效电路模型和各个参数的计算方法,推导出了PT励磁支路非线性参数的计算过程。然后在Matlab编程环境下使用M语言编制程序来计算PT励磁支路非线性电阻的伏安特性曲线和非线性电感的励磁特性曲线。此后以10 kV电压互感器为例测试了其低压绕组的伏安特性和损耗功率值,对测试结果进行了分析后用编制的程序计算了励磁支路非线性电阻的伏安特性曲线和非线性电感的励磁特性曲线。最后给出了计算励磁特性时需要的注意事项。

Potential Transformer Model for Ferroresonance Overvoltage Calculation

According to the equivalent circuit model' characteristic of the potential transformer(PT),Firstly it is presented the equivalent circuit model and the method of calculating all the parameters for the potential transformer,deduced the procedure of calculating the nonlinear parameters in the excitation branch for the potential transformer.And then programed in the MATLAB programming environment via using the M language to calculate the nonlinear resistor' volt-ampere characteristic curve and the nonlinear inductance' excitation characteristic curve in excitation branch of potential transformer.Proceed from 10kV potential transformers by testing the volt-ampere characteristic and loss power,the experimental data has been analyzed and used to calculate the nonlinear resistor' volt-ampere characteristic curve and the nonlinear inductance' excitation characteristic curve.Finally,it is given some necessary precautions to calculate the excitation characteristic.