Estimation and analysis of VFTO in 420kV Gas Insulated substation

Author

Samikkannu, Reuban ; Annadurai, Santosh Kumar

Author_Institution

Dept. of High Voltage Eng., Anna Univ., Chennai, India

fYear

2014

Firstpage

165

Lastpage

172

Abstract

Very Fast Transient Overvoltages (VFTOs) which are caused mostly due to disconnector operations in Gas Insulated substations (GIS) impose several problems on the insulation of the system and also to the connected high voltage equipment. Therefore, it is important to do a VFTO study in GIS. In this paper, VFTO for switching operations in a 420kV GIS with different trapped charges are estimated. The location with the highest peak magnitude of VFTO occurrence is found and is compared with the safety margin of BIL of the substation. Possibilities for mitigation of VFTO at transformer terminal are also discussed. Computer simulations are done using EMTP-RV.

Keywords

gas insulated substations; high-voltage techniques; overvoltage; VFTO; gas insulated substation; high voltage equipment; transformer terminal; very fast transient overvoltages; voltage 420 kV; Capacitance; Circuit breakers; Gas insulation; Integrated circuit modeling; Power transformer insulation; Substations; Surges; Disconnector switch (DS); EMTP-RV; Gas Insulated substation; Trapped charges; Very fast transient overvoltages;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuit, Power and Computing Technologies (ICCPCT), 2014 International Conference on

Print_ISBN

978-1-4799-2395-3

Type

conf

DOI

10.1109/ICCPCT.2014.7054803

Filename

7054803