摘要
VFTO(Very Fast Transient Overvoltage)是由于GIS操作隔离开关使间隙发生多次预击穿和重击穿所造成的,对变电站内变压器类设备的绝缘产生影响,因而受到普遍关注。本文针对某变电站252kV GIS在不同操作方式下,隔离开关操作时引起的VFTO进行仿真计算,得到VFTO的幅值和各节点的波形图。计算结果表明出现在252 kV GIS内部的VFTO幅值虽不大,但滤去直流分量后高频分量电压频率在几十兆赫的幅值却很大,再考虑积累效应,对站内电感类设备将构成严重威胁。
VFTO （Very Fast Transient Overvoltage）produced by operating the disconnector that makes the contact preliminary breakdown and secondly breakdown may be harmful to the transformer＇s insulation. In this paper, the amplitude and the node waveform of the different way of switching operation to the VFTO is calculated by the electromagnetic transient pro- gram. The results show that the amplitude isn＇t very high . But the high frequency components is big, considering the cumulative effect, that is very harmful to the inductance equipments.
出处
《浙江水利水电专科学校学报》
2013年第3期60-64,共5页
Journal of Zhejiang Water Conservancy and Hydropower College
基金
2012年度校级科研课题(XKYYB201204)
