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Research on Influencing Factors of Very Fast Transient Overvoltage in EHV GIS

Ruming Feng,Chuanqiang Che,Jianli Zhao, Qiong Wang,Lei Zhao,Wenliang Yang

ieee international conference on high voltage engineering and application（2020）

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Abstract
The influence factors of VFTO when the disconnector operating of GIS are obtained, the methods of suppressor VFTO of UHV GIS are put forward. based on construction and operating mode of 550kV GIS VFTO at different operating mode are calculated, the effects of VFTO on transformer insulation, the breaker capacitance, residual charge voltage and bus wave impedance on VFTO are analyzed. Aiming at the transmission and transformation system, measures to suppress VFTO are proposed, thus providing a reference for the production and operation of EHV GIS equipment.
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Key words
gas insulated switchgear,very fast transient overvoltage,disconnector,transformer,surge arrester,EHV GIS
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