一种长间隙放电步进发展计算模型

A Step-development Discharge Calculation Model for Long Air Gaps

随着电压等级的提高,输电线路间隙的最小操作冲击击穿电压不仅低于雷电波击穿电压,甚至低于工频击穿电压。因此,操作冲击下长空气间隙的放电特性成为空间间隙选择的重要依据。目前,由于长空气间隙放电理论不够完善,针对长空气间隙放电特性的研究还是以模拟实验为基础,不仅实验结果无法覆盖所有实际情况,而且耗费大量资源。因此,有必要建立长空气间隙放电特性仿真计算模型,预测操作冲击下不同电极结构的长空气间隙放电特性,这对推动长间隙放电理论发展具有重要学术意义。

With the increasing of the transmission line volatge class, switching impulse strengths of air gaps will be lower than lightning impulse strengths and even be lower than power-frequency impulse strengths. Thus, the distances of air gaps should be determined by the discharge characteristics of switching impulse. Nevertheless, researches on dicharge characteristics of long air gaps under switching impulses are now usually based on the laboratory experiments, which can ＇ t satisfy all the conditions and will dissipate many financial resources. Consequently, it is necessary to establish a model for making researches on dicharge characteristics of long air gaps under switching surge. It is of great academic significance to promote the theory development of long air-gap discharges and of great practical significance to improve the reliability of transmission systems and guarantee the economic efficiency of transmission project designs.