750kV GIS中VFTO现场实测波形分析  

Analysis of VFTO Waveforms on-Site Measured on 750 kV GIS

作　　者：李云阁[1] 尚勇 施荣 张琳 

机构地区：[1]陕西电力科学研究院,陕西西安710054 [2]西北电网有限公司,陕西西安710048

出　　处：《电网与清洁能源》2011年第11期25-29,共5页Power System and Clean Energy

摘　　要：介绍了在750 kV官亭变电站实测VFTO的方法,通过分析现场实测波形,得到了VFTO的持续时间、残余电荷的电压值、隔离开关触头间的电弧重燃次数、VFTO的峰值和上升速度、VFTO的频率范围。用外推法计算了最大VFTO峰值和上升速度,分别为2.46 pu和12.64 pu/μs。实测结果说明,限制由于隔离开关操作引起的VFTO的有效措施为在隔离开关中装设合/分闸电阻。This paper presents the results of VFTO measurement at Guanting substation. By analyzing the oscillograms, characteristics of VFTO are achieved, including times of the arc restrike between the contacts of disconnectors, remnant voltage caused by trapped charge, VFTO＇s duration, magnitude, rise rate, and frequency. The possible maximum of the magnitude and rise rate, estimated through an extrapolation method, are 2.46 pu and 12.64 pu/μs respectively. The research indicates that equipping closing/opening resistors in disconnectors is an effective way to suppress VFTO.

关 键 词：750 KV GIS 隔离开关 VFTO 合/分闸电阻 

分 类 号：TM886[电气工程—高电压与绝缘技术]