10kV电网TV铁磁谐振过电压数字仿真及研究

The Digital Simulation and Study of TV Ferroresonance Over Voltage in 10 kV Power Network

结合南京供电局萨家湾变电站 10kV配电系统的实际情况 ,通过计算机数字仿真 ,对配电网电源中性点经阻抗接地方式和TV高压侧中性点经非线性电阻接地对电磁式电压互感器饱和引起的铁磁谐振的影响作了详细计算与分析。认为配电网电源中性点经阻抗接地方式不仅能抑制弧光接地过电压 ,而且能有效抑制铁磁谐振过电压 ;

With Sajiawan 110 kV substation as an example and through digital simulation on computer ,the influence on ferroresonance is calculated and analyzed in detail,which is caused by the electromagnetic TV saturation. Where the neutral point of the network is grounded through impedance and the neutral point of the TV high voltage side is grounded through non linear resistance.The impedance grounding can effectively restains the over voltage from both arc grounding and ferroresonance. The TV neutral point grounded through a nonlinear resistance is also one of the measures that check the ferroresonance over voltage.