中国电力2016，Vol.49Issue(7)：1-8,8.DOI:10.11930/j.issn.1004-9649.2016.07.001.08
1100kV GIS中VFTC的暂态特性研究
Study on Transient Characteristics of VFTC in 1 100 kV GIS Substation
摘要
Abstract
The very fast transient current (VFTC) occurring in GIS is mainly caused by SF6 gas discharge due to disconnector operation.This phenomena will not only destroy the insulation of GIS equipment,but also cause a series of electromagnetic interference problems on the secondary equipment.However,current research mostly focuses on very fast transient overvoltage (VFTO) and ignores the effect of VFTC.Transient characteristics of VFTC in UHV (Ultra High Voltage) level are studied.A segment model is adopted in high frequency discharge model of SF6 based on impedance change in different discharging stages.This new model is applied to simulate VFTC during disconnector operation in a UHV GIS substation.For better understanding the transient characteristics of VFTC,decay time is defined to describe VFTC transient characteristics.Restrain effect of damping resistor on VFTC is also discussed.From research results,VFTC under UHV level has characteristics of high amplitude (up to several thousand amperes),high frequency,broad dominant frequency distribution (0～25 MHz) and long decay time (1O0 microseconds).The damping resistor can greatly improve VFTC decaying rate,but has small influence on distribution of dominant frequency.关键词
GIS/隔离开关/VFTC/SF6气体放电Key words
GIS/disconnector/VFTC/SF6 gas discharge分类
信息技术与安全科学引用本文复制引用
魏梅芳,吴细秀,余光召,田芸,吴士普..1100kV GIS中VFTC的暂态特性研究[J].中国电力,2016,49(7):1-8,8.基金项目
国家自然科学基金资助项目(51107093) （51107093）
湖南省教育厅科学研究资助项目(12C0916)This work is supported by National Science Foundation of China(No.51107093) （12C0916）
Scientific Research Project of the Education Department of Hunan Province(No.12C0916). （No.12C0916）
