Influence Factor Analysis of Conductor-Plane Gap Breakdown Characteristic Under Vegetation Fire at High Altitude Condition
Vegetation fires may lead to tripping and shutdown of overhead transmission lines,thus endangering the safe and stable operation of power grids.At present,there are fewer studies on the breakdown characteristics of conductor-plane air gaps under vegetation fire environment at high altitude condition.In view of this problem,this paper carries out DC breakdown characteristic tests at 2 013 m altitude using a 4 m conductor-plane air gap breakdown characteristic test platform under different typical vegetation fire conditions,and investigates the effects of the type of vegetation,the proportion of smoke bridging,and the slope on the breakdown characteristics of the gaps.The results show that under different vegetation fire conditions,the breakdown voltage of pine flame gap is about 1.38 times of that of China fir;the breakdown voltage of the gap is positively correlated with the proportion of smoke bridging,and the influence of flame on the breakdown voltage of the gap of the transmission line is greater than that of the smoke particles.With the slope increasing to 30°,the insulating strength of the flame gap is gradually increased,and the breakdown voltage is 41.5％greater than that of the flat ground(0°),the discharge locations gradually move upward after elevation,mostly concentrated in the middle and upper part of the vegetation crib.
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