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Influence of Switching Conditions on the VFTO Magnitudes in a GIS

Kumar, Vinod V and Thomas, Joy M and Naidu, MS (2001) Influence of Switching Conditions on the VFTO Magnitudes in a GIS. In: IEEE Transactions On Power Delivery, 16 (4). pp. 539-544.


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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.

Item Type: Journal Article
Publication: IEEE Transactions On Power Delivery
Publisher: IEEE
Additional Information: ©2001 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: Disconnector switch;EMTP;Gas insulated substation;Trapped charge;very fast transient overvoltages
Department/Centre: Division of Electrical Sciences > High Voltage Engineering (merged with EE)
Date Deposited: 22 Aug 2008
Last Modified: 19 Sep 2010 04:16
URI: http://eprints.iisc.ac.in/id/eprint/1918

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