Abstract
In order to effectively reduce lightning stroke outage rate, effect of lightning protection with surge arrester on transmission line has been generally acknowledged relative to other lightning protection measures. This article introduces in such aspects as the working principle of line surge arrester and effect of lightning protection, and also explores application for lightning arrester of distribution network to achieve difference lightning protection and improve the lightning protection performance of distribution network.
Highlights
According to operational experience at home and abroad, lightning stroke is the main reason to cause line tripping and service interruption, according to the statistical report of interruption of service in china, 40%~70% of the accident in the power system are caused by lightning which has brought a great loss to national economy.In general, the methods which include improving the insulation level of line, decreasing grounding resistance, decreasing protection angle and so on have been used in cutting down lightning accidents
Through analysis of lightning disturbance among past years, combined with the line being struck by lightning frequency and geographic location characteristics, it is effective to install line surge arresters without gaps in parallel with insulator for protecting the insulator and substation equipment, it can improve lightning withstand level of transmission lines and reduce lightning accident rate
Effect of lightning protection with surge arrester on transmission line has been generally acknowledged relative to other lightning protection measures
Summary
According to operational experience at home and abroad, lightning stroke is the main reason to cause line tripping and service interruption, according to the statistical report of interruption of service in china, 40%~70% of the accident in the power system are caused by lightning which has brought a great loss to national economy. Operational experience has proved that surge arrester which used in strong lightning activity or high soil resistivity areas can effectively improve lines lightning withstand level. Lightning withstand level associates with four important factors, such as 50% discharge voltage of the insulator string, lightning current, overhead ground wire and impulse grounding resistance of the tower. Lightning current associated with location and atmospheric conditions, reducing grounding resistance of tower is main measures for improve lightning withstand. Surge arrester have a good holding potential role to ensure insulator string flashover not to occur, achieve the goal which prevent transmission line lightning trip
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