高海拔地区 GIS 现场耐压试验技术研究

Ｒesearch on GIS Field Withstand Voltage Test Technology in High Altitude Area

摘要:

以在海拔 4300 m 开展的藏中联网工程 500 kV 芒康站 500 kV GIS 耐压试验为基础，对高海拔地区 GIS 耐压试 验设备外绝缘水平确定、谐振回路参数选择、空气电晕对试验的影响等问题进行了探讨，提出了高海拔地区 GIS 交流 耐压试验参数配置流程，初步验证了以电气设备外绝缘海拔修正方法对试验设备外绝缘水平进行海拔校核是可行 的。发现在高海拔地区，回路电晕控制是试验能否成功的关键因素，强烈的局部放电会造成谐振回路参数突变而引 起输出电压大幅波动。所研究成果为后续开展高海拔地区 GIS 交流耐压试验提供了新的见解和成功借鉴。

Abstract:

Based on 500 kV GIS withstand voltage test of 500 kV Mangkang substation with altitude 4300 m in central Tibet networking project，the determination of external insulation level of GIS withstand voltage test equipment at high altitudes，the selection of resonant circuit parameters and the influence of air corona on the test are discussed． The parameter configuration process of GIS AC withstand voltage test in high altitude area is proposed． Besides，to calibrate the external insulation level of test equipment by using the altitude correction method of external insulation of electrical equipment is preliminarily proved to be feasible． During the test，it is found that the corona of test circuit is very strong which leads to the sudden change of parameters of resonant circuit and causes the output voltage to fluctuate greatly． The research results provide new insights and references for the follow － up GIS AC withstand voltage test in high altitude areas．