微水对SF6气体工频击穿特性影响的实验研究
Experimental Study of the Effect of Micro-Water on the Frequency Breakdown Characteristics of SF6 Gases
李瑞 1李凯 1李峰1
作者信息
- 1. 上海电力大学 电气工程学院,上海 200090
- 折叠
摘要
运行在工频电压条件下的气体绝缘全封闭组合电器(GIS)受到微量水分侵入时会严重降低气室内SF6气体的绝缘性能,影响高压电器设备安全运行.为此,自主设计了GIS绝缘结构实验装置,并搭建了气体放电实验平台,通过控制电极微水体积分数、气压以及电极间隙距离,对SF6气体在稍不均匀电场下的工频击穿特性进行实验研究.研究发现:在稍不均匀电场中,SF6气体工频绝缘性能随微水体积分数的增大呈下降趋势;气压范围在0.4～0.6 MPa时,微水体积分数超过800 μL/L后,随着其增大SF6气体工频击穿电压下降较为明显;在相同气压下,电极间隙距离越大,微水体积分数增大对SF6气体工频绝缘性能的影响越大.根据实验结果,建议在工频电压下,设备运行温度为15℃时,0.4 MPa和0.5、0.6 MPa下气体绝缘设备中水分体积分数限值分别为450 μL/L和250 μL/L.
Abstract
When the GIS operating under industrial frequency voltage is invaded by trace water,the insulating property of SF6 gas inside the gas chamber will be seriously reduced,which will affect the safe operation of high-voltage electrical equipment.For this reason,the GIS insulation structure experimental device is designed independently,and the frequency experimental research on SF6 gas under slightly uneven electric field is carried out by constructing the gas discharge experimental platform and controlling the distance of the discharge gap,air pressure and different micro-water content.The results show in a slightly uneven electric field,the frequency insulation performance of SF6 gas decreases with the increase of micro-water content;when the gas pressure is set to 0.4～0.6 MPa,the micro-water content is more than 800 μL/L,and the frequency breakdown voltage of SF6 gas decreases more obviously;under the same gas pressure,the larger the gap distance is,the effect of micro-water content on the frequency insulation performance of SF6 gas is the more obvious.In addition,based on the experimental results,450 μL/L and 250 μL/L were suggested as the moisture control limits at 0.4 MPa,0.5 and 0.6 MPa at 15℃,respectively,under the IFV voltage.
关键词
SF6气体/微水/工频/绝缘性能/稍不均匀电场Key words
SF6 gas/micro-water/frequency performance/insulation/slightly inhomogeneous electric field引用本文复制引用
出版年
2024
NETL
NSTL
万方数据