基于电路仿真法的叠装电抗器雷电冲击电压分布特性研究

Research on Lightning Impulse Voltage Distribution Characteristics of Stacked Reactor Based on Circuit Simulation Method

针对叠装干式空心电抗器上、下线圈在雷电冲击电压下分压特性不同,依托于渝鄂背靠背直流联网工程,采用电路仿真分析与试验验证相结合的方法,研究叠装电抗器在雷电冲击下的冲击电压分布特性。试验结果表明:首先,叠装电抗器雷电冲击电压分布特性实测结果与仿真结果基本吻合;其次,由于电感及杂散电容影响,上、下线圈承受电压波形不同于雷电输入波,是两个衰减振荡波形,而且峰值出现时间不同;最后,单节线圈雷电冲击试验电压按总耐受电压的80%进行试验。研究成果可为后期两台或者多台电抗器串联的雷电冲击电压分布特性研究提供依据。

Aiming at the different voltage dividing characteristics of upper and lower coils of stacked dry air-core reactor under lightning impulse voltage,relying on the back-to-back DC interconnection project in Chongqing and Hubei,the impulse voltage distribution characteristics of stacked air-core reactor under lightning impulse are studied by combining circuit simulation analysis with experimental verification.The experimental results show that:firstly,the measured results of lightning impulse voltage distribution characteristics of stacked reactor basically agree with the simulation results;secondly,due to the influence of inductance and stray capacitance,the upper and lower coils withstand voltage waveforms different from the lightning input wave,which are two attenuation oscillation waveforms with different peak time;finally,the lightning impulse test voltage of single coil is based on the total withstand voltage 80%were tested.The research results can provide a basis for the study of lightning impulse voltage distribution characteristics of two or more reactors connected in series in the later stage.