“棒板”间隙雷电冲击放电时高压侧预放电电流的测量

Pre-breakdown Current Measurements from High Voltage Electrode of Rod-plane Gap Under Lightning Impulse Voltage

长间隙放电机理研究是高压电工领域的基础研究。长间隙放电电流与放电机理关系密切,通过研究放电电流的变化,有助于深入研究长间隙放电的物理过程。为此,介绍了一套基于光电集成技术的无源模拟信号隔离传输系统,以光纤做为传输媒质,实现从高压电极侧测量流注鱼放电电流。对1 m棒板间隙在正极性雷电冲击电压作用下流注预放电电流进行了测量,有效将容性位移电流与流注放电形成的脉冲电流分开,流注放电形成的电流脉冲上升时间约为80 ns,脉冲宽度约为800 ns,注入电荷随施加电压增大而增大。

A passive analog signal isolation ＆ transmission system based on the electro optical integrated technology was proposed. This system with fibers as transmission medium was used to measure the streamer current from the high voltage electrode. The streamer currents of 1 m rod plane gap energized by positive lightning impulse voltages were measured, of which the displacement current and discharge current were separated. The rinsing time of the current pulses produced by streamer was 80 ns, while the pulse width was 800 ns, and the injected charge increased as the applied voltage increased.