高海拔地区绝缘子串片数的选择

高海拔地区气压低、空气密度小，绝缘配合设计须进行修正，导线绝缘子片数应按工频、操作过电压及雷电过电压三种情况的安全要求来确定，通过对工频、操作过电压及雷电过电压三种工况下绝缘子片数选择的分析、计算，校验，阐述了绝缘子片数选择的计算方法，同时通过比较得出，在高海拔地区，操作过电压对绝缘子片数不起控制作用，雷电过电压也不作为绝缘子片数选择的决定因素，绝缘子片数主要由工频电压泄漏比距要求控制。

Study on selection of number of insulator strings in high - altitude area

Based on the specical natural condition of lower air density and lower air pressure in high -altitude areas, insulation coordi- nation design should be modified, and number of insulator strings of transmission lines should be corulirmed by safety requirement in such three conditions： power frequency overvoltage, switching overvoltage and lightning overvoltage. Under these conditions, by analyzing, calculating and verifying the selection of number of insulator strings, this thesis daborates the method for calculating the selection, meanwhile by comparing, has concluded that the selection of number of insuhtor strings is not up to switching and lightning overvoltage, but the power frequency overvoltage leakage- distance ratio in high -altitude areas.