Research And Application On Arc-Extinguishing And Arc-Guiding Performance Of New Lightning Protection Gap Devices

Transmission line insulation flashover established frequency arc is the direct cause of tripout, where in the proportion of flashover caused by lightning strike is large, especially in the Southern China thunderbolt areas. Tripout of transmission line threat the security and stability of power system operation severely, and brought great negative impact on the industry to the national economy and people’s lives. In order to reduce the accident rate by lightning strike, researchers of power system carried out a detailed study and put forward a series of effective preventive measures, achieved some sesults. Traditional measures of lightning protection has a lot of defects.the effect is not ideal. With the rapid development of the economy, the trend of increasing pollution in many parts of the country appears, filthy conditions transmission line insulator severe compared with the past. Therefore, power frequency voltage insulator flash filthy promise has become another major factor in the power system transmission line tripout.The research group based on lines from lightning trip and possible contamination insulator flashover voltage frequency grim situation. On the basis of the traditional parallel transmission line protection gap on research and development of a new type interrupter mine clearance. The device has excellent arc-extinguing and arc-guiding function, can effectively prevent the transmission lines lightning trip and flashover trip.This paper mainly studied these things, first, the physical properties of the arc motion analysis of the situation, discuss the relationship between the energy balance of the arc. Then based on the chain arc model discuss the arc motion and development. Using this model to analyze the factors that affect the movement of the arc. As a basis for lightning protection gap upper and lower electrodes to optimize the design with gold, the simulation and test pilot selected the most outstanding performance of the arc gap electrode type. Through a lot of tests to determine the impact of new lightning protection gap in the correct extinguishing insulated with insulator strings. Finally, research on the blast of the arc extinguishing properties, carried out arc extinguishing tests.Images taken by using CCD and wave record eaveforms recorded by can clearly show the process of arc extinguishing. The results show that with the right insulation when the interrupter mine clearance quickly extinguish the arc flashover between channels,the combination of theory and practice greatly improves the correctness of trail results. New lightning protection gap in a number of transmission lines has been applied have achieved excellent results.