With the large - scale exploitation of hydroelectric resource in the west , the effects of severely cold , high humility and high altitude on the external insulation performance of overhead transmission line insulator will more and more server 隨著水電資源的大規(guī)模開發(fā),西部高寒、高濕及高海拔對輸電線路外絕緣電氣特性的影響將更加突出。