配网自能式压缩灭弧方法仿真分析

Simulation Analysis of Arc-extinguishing Method of Self-energy Compression for Distribution Grid

配网线路防雷保护是保障电网安全运行的重要措施。由过去几十年线路运行的经验来看,采取传统防雷措施未能在根本上解决配网的雷击事故。因此本课题研究一种自能式压缩灭弧防雷方法,此方法利用冲击电弧自身能量抑制工频建弧率,工频续流电弧在暂态建弧的最初期就将受到深度抑制。通过理论分析并建立数学模型,利用fluent软件模拟灭弧气流速度与电弧温度验证其可行性。该自能式压缩灭弧方法在发生雷击时,通过利用压缩冲击电弧所形成的能量分段累积热量,产生高速自膨胀纵吹气流作用于电弧,从而切断工频电弧通道,且能在0.7ms内熄灭工频电弧。

It is an important measure to ensure the safe running of the distribution grid.According to the experience of line running in the past few decades,the adoption of traditional lightning protection measures has not fundamentally solve the lightning accident of the distribution grid.So this topic research the arc-extinguish method of self-energy compression,the method reduces the power frequency arc rate by using the impact arc energy,power frequency arc will be mostly inhibited at the beginning of arcing.Through theoretical analysis and mathematical model,the fluent software is used to simulate the airflow velocity of the arc-extinguishing and arc temperature to verify its feasibility.The self-energy compression and arc extinguishing method generates a high-speed self-expanding longitudinal airflow to act on the arc by using the energy formed by the compression impact arc to accumulate heat in the event of a lightning strike,thereby cutting off the power frequency arc channel and being able to cut the power frequency arc channel at 0.7 ms.