Title :
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
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;
Conference_Titel :
Circuit, Power and Computing Technologies (ICCPCT), 2014 International Conference on
Print_ISBN :
978-1-4799-2395-3
DOI :
10.1109/ICCPCT.2014.7054803
