高压并联电容器用放电线圈瞬态特性研究

Research on Transient Characteristics of Discharge Coils for High Voltage Shunt Capacitors

为了深入研究影响高压并联电容器用放电线圈放电速度和饱和速度的因素,提出一种电路与磁路时域耦合的计算方法,考虑到铁心材料的非线性饱和特性,建立电容器组与放电线圈串联的放电电路的计算模型,以反映外部电路元件的时域特性及放电线圈内部磁通链的耦合关系。在多台不同规格的放电线圈上,进行电容器组残压释放瞬态过程的仿真计算与试验研究,计算结果和试验结果基本吻合,表明所提计算方法能够有效地应用于高压并联电容器放电线圈瞬态特性的研究。通过计算研究了高压并联电容器放电线圈电气和结构参数对其饱和速度、放电速度及振荡电路第一个负半波的峰值电压产生的影响,为放电线圈的参数优化提出建议。

To study the factors of influencing the discharge rate and saturated velocity of discharge coil for high voltage shunt capacitors,an electric circuit and magnetic circuit coupled model of discharge circuit,which consists of discharge coil in series with the shunt capacitor in the time-domain,was presented. Considering the nonlinear saturated characteristic of core material,simulated calculation and experimental research on some different discharge coils were conducted to reflect effectively the characteristics of the external circuit element time-domain and the magnetic flux linking in discharge coil. The experimental results and the calculated results are basically consistent,which proves that this method can be effectively applied to the analysis of discharge coils＇ transient characteristics for high voltage shunt capacitors. Additionally,the effects of electrical and structural parameters of the discharge coil on its saturated velocity,discharge rate and peak voltage of the first negative half wave of the oscillation circuit were analyzed. Finally,some suggestions are put forward for optimizing parameters of discharge coils.