Analysis of very fast transient overvoltages (VFTO) from onsite measurements on 800 kV GIS

Author

Yunge Li ; Yong Shang ; Lin Zhang ; Rong Shi ; Wei Shi

Author_Institution

Shaanxi Electr. Power Res. Inst., Xi´an, China

Volume

19

Issue

6

fYear

2012

fDate

12/1/2012 12:00:00 AM

Firstpage

2102

Lastpage

2110

Abstract

In IEC 60071-1 and 62271-102, there is neither standard voltage shape nor standard peak value for very fast transient overvoltages (VFTO). Previous work by other researchers had classified VFTO into two types. A new type was identified in this paper based on an onsite test on a commercially-operated 800 kV GIS. Disconnectors were opened/closed under real operation conditions. Characteristics of the new VFTO type were analyzed, including times of the arc restrikes between the contacts of the disconnectors, trapped charge, damping time constant, magnitude, rise rate, and oscillating frequency. The results of this paper are expected to be of help for the completion of standards on VFTO.

Keywords

IEC standards; arcs (electric); gas insulated substations; gas insulated switchgear; overvoltage; transients; voltage measurement; voltage 800 kV; Gas insulation; Power transformer insulation; Standards; Surges; Transient analysis; Transmission line measurements; Voltage measurement; Digital measurements; EHV substations; disconnector switching; gas insulated switchgear; switching transients; very fast transient overvoltages;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/TDEI.2012.6396970

Filename

6396970