基于叠加性雷击防护的灭弧方法仿真分析

Simulation Analysis of Arc-Extinguishing Method Based on Superposition of Lightning Protection

当叠加性雷击连续向输电线路放电时,将会对电网运行造成毁灭性打击。提出通过诱导固相气流全程匹配叠加性雷击放电时重复建弧的灭弧方法,将实现对所有雷击工况防护全覆盖。为了验证其灭弧方法的科学有效性,首先对灭弧原理进行了扼要分析论证;然后建立数学模型,对固相气流在灭弧腔内的作用效果进行理论分析与量化计算;提出并建立了叠加性雷击模型并用仿真软件对两种流体耦合过程进行模拟。理论分析计算与仿真结果表明:固相气流能在1L的刚性空间内维持高达131 MPa的强压2.8 ms以上;电弧能在气流正压作用时间内可靠熄灭;深度抑制叠加性雷击发生时的重复建弧。

A devastating influence will attack the power grid if the superimposed lightning strikes the transmission line. A method to realize the full coverage of lightning protection by inducing the solidair which matches the superposition of the lightning to extinguish arc is proposed. In order to verify the ef- fectiveness of arc-extinguishing method, first of all through the general objective law the are-extinguish- ing principle are briefly analyzed; then a mathematical model is established, the effectiveness of the solid-air in arc chamber expounded by theoretic analysis and quantitative calculation; A superimposed light- ning strike model is proposed, and the simulation software is used to simulate the coupling process of the two fluids. The theoretical analysis calculation and simulation results show that the solid-air in 1 L the rigid space maintained more than 131 MPa strong pressure 2.8 ms; arc are extinguished reliably within the positive pressure time; profound suppression of repeated arcing when superimposed lightning occurs.