Title :
Influence of switching conditions on the VFTO magnitudes in a GIS
Author :
Kumar, V. Vinod ; Thomas, J.M. ; Naidu, M.S.
Author_Institution :
Dept. of High Voltage Eng., Indian Inst. of Sci., Bangalore, India
fDate :
10/1/2001 12:00:00 AM
Abstract :
Estimation of very fast transient overvoltage (VFTO) has been carried out using EMTP for various switching conditions in a 420 kV gas insulated substation. The variation of VFTO peak along the GIS bus nodes for disconnector and circuit breaker switching operations as well as the variation of VFTO peak with different magnitudes of trapped charges have been studied. The results indicate a distinct pattern of variation of VFTO peak along the nodes of the GIS bus in the case of disconnector switch operation as compared to that of circuit breaker operation. It has also been noticed that the variation of VFTO peak levels are not in direct proportion to the trapped charge present on the HV bus
Keywords :
EMTP; circuit breakers; gas insulated substations; overvoltage; power system analysis computing; switching; switching transients; 420 kV; EMTP; GIS bus nodes; VFTO peak levels; circuit breaker switching; computer simulation; disconnector switching; gas insulated substation; switching conditions; trapped charges; very fast transient overvoltage; Circuit breakers; Dielectrics and electrical insulation; EMTP; Frequency; Gas insulation; Geographic Information Systems; Substations; Switches; Switchgear; Switching circuits;
Journal_Title :
Power Delivery, IEEE Transactions on
