基于气吹灭弧的输电线路防雷保护间隙的研究

Research of Lightning Protection Gap of Transmission Line Based on Airflow Blowing Arc-queching

传统输电线路防雷措施以抑制绝缘闪络为目的,由于受雷击强度、雷击类型、土壤电阻率、线路类型等多种不可控因素的限制,其防雷效果较差,性价比较低。基于气吹灭弧的新型输电线路防雷间隙,以抑制绝缘建弧率为根本目的,放弃抑制绝缘闪络,能够利用雷电流触发形成高速气流并在极短时间内熄灭工频续流电弧,从而大大降低雷击跳闸率。文章建立了气吹灭弧的数学模型,并进行了仿真分析和实验验证,以此验证了气吹灭弧防雷间隙的有效性。

This Traditional lightning protection measures aims to suppress insulator flashovering,but under the constraint of various factors including lightning strength,lightning pattern, soil resistance rate, and line type, its has got a poorer effect and lower cost performance.The novel lightning protection gap bases on airflow blowing arc-quenching aims at suppressing insulator arc-building rate,which abandons suppressing insulator flashovering,but utilizes high-speed airflow triggered by lightning current to interrupt the power frequency arc within ultrashort time , thus reduce lightning trip-out rate.This article performed the numerical model of airflow arc-quenching, and conducted simulation analysis and experimental verification, proving the validatity of airflow blowing arc-quenching lightning protection gap.