低气压下开关柜空气间隙工频放电特性

发布时间：2018-07-05 16:06

本文选题：开关柜 + 空气间隙　；参考：《电网技术》2017年12期

【摘要】：开关柜内裸露的导体之间易形成各种空气间隙,其工频放电特性对开关柜的绝缘性能有很大的影响。为得到开关柜内不同空气间隙类型在高海拔下的工频放电特性及其影响因素,以40.5 kV开关柜母线室存在的4种典型的空气间隙及棒-板间隙为研究对象,在人工气候实验室进行了海拔232~3000 m下的低气压工频放电特性试验。结果表明:开关柜内不同空气间隙类型的放电电压U明显不同,放电电压U随气压P下降的趋势也不同;在开关柜空气间隙海拔校正时,湿度h对间隙放电电压的影响较小,仅简单考虑气压是可行的;开关柜空气间隙的电场分布比棒-板间隙更不均匀,其放电电压U可能比棒-板间隙更低;此外,开关柜空气间隙在间隙距离d小于400 mm时放电电压U与距离d呈非线性关系。
[Abstract]:The air gap is easily formed between the bare conductors in the switchgear, and its power frequency discharge characteristics have a great influence on the insulation performance of the switchgear. In order to obtain the power frequency discharge characteristics of different air gap types in switchgear at high altitude and their influencing factors, four typical air gaps and rod-plate gaps in the bus room of 40.5 kV switchgear cabinet were studied. The characteristics of low pressure power frequency discharge at an altitude of 232 ~ 3000m have been tested in an artificial climate laboratory. The results show that the discharge voltage U of different air gap types in the switchgear is obviously different, and the trend of the discharge voltage U decreases with the air pressure P, and the humidity has little effect on the gap discharge voltage when the air gap of the switchgear is corrected above sea level. It is feasible to simply consider the air pressure, the electric field distribution in the air gap of the switchgear is more uneven than that in the rod-plate gap, and the discharge voltage U may be lower than that of the rod-plate gap. There is a nonlinear relationship between the discharge voltage U and the distance d when the gap distance is less than 400 mm.
【作者单位】：输配电装备及系统安全与新技术国家重点实验室(重庆大学);重庆广仁铁塔制造有限公司;
【基金】：“电力设备电气绝缘国家重点实验室开放课题(EIPE16207)”项目资助
【分类号】：TM591

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