非标准雷电冲击电压模拟技术研究

Research on Simulation Technology for Non-standard Lightning Impulse Voltage

变电站内实际遭受的雷电冲击电压与在高压设备试验中所用的标准雷电冲击电压存在很大差异。为探讨变电站内设备实际可以承受的非标准雷电冲击电压与标准雷电冲击电压(1.2/50μs)的差异,设计了一种可以产生模拟非标准雷电暂态电压波形的电路,可对电路元件参数进行调节,研究电路中不同的元件参数对产生的非标准雷电冲击电压波形的影响。非标准雷电冲击电压波形大多是振荡型冲击电压波形,通过Matlab Simulink进行电路仿真,依据仿真设计出能够产生非标准振荡型冲击电压波形的电路。研究结果表明,仿真电路产生的电压波形与实际电路测量得到的冲击电压波形相比较基本一致。该研究为进一步探讨非标准雷电振荡型冲击电压对电介质击穿特性的试验奠定了基础。

The actual lightning impulse voltage suffered in substations is far from the standard lightning impulse voltage used in high-voltage equipment test.In order to discuss the difference between non-standard lightning impulse voltage and standard lightning impulse voltage(1.2/50μs)actually tolerated by substation equipment,a circuit which can generate non-standard lightning voltage waveform is designed,the circuit component parameters are adjusted,and the influence of different compo-nent parameters on non-standard lightning impulse voltage waveform is studied.Most of non-standard lightning impulse voltage waveform are oscillating impulse voltage waveform,the circuit simulation is carried out with Matlab Simulink,and the circuit which can generate non-standard oscillating impulse voltage waveform is designed according to the simulation.The re-sults show that the voltage waveform generated by the simulation circuit is basically consistent with the impulse voltage wave-form measured by the actual circuit.This research lays a foundation for further exploring the dielectric breakdown characteris-tics of non-standard lightning impulse voltage.