Abstract:

In order to analyze the main reasons 750kV transmission line partial wind trip through analytical method for the insulator gap after the partial wind at different angles from the line to find the cause of the trip the wind angle. Then use the procedure law wind angle it calculated the design wind speed 31m/s tower wind partial safety margin of only 5 degrees, scene design wind speed reaches 1.1 times the wind speed wind occur partial trip. By analyzing the scene found the scene monitoring the wind speed with a speed of up to 27.5m/s, maximum wind speed up to 40.5m/s, the main cause of air drawn partial trip for maximum wind speed exceeds the design wind speed conclusions. Finally, the need for transformation of the transmission line towers analyze the advantages and disadvantages of partial measures of wind, come 750kV transmission line is recommended pull-type wind measure wind conclusions, and the wind cable selection were analyzed. Wind through the transformation will help improve wind resistance 750kV transmission line to improve the level of safe operation of the grid.

Key words: Wind biased, tripping, hazard wind angle, standard wind speed, maximum wind speed, wind cable