VFT performance of a 180/110 mm co-axial gap in SF6 up to 4 bar absolute

Nielsen, Shawn, Jan, Reynders, & Jandrell, Ian (1999) VFT performance of a 180/110 mm co-axial gap in SF6 up to 4 bar absolute. In 11th International Symposium on High-Voltage Engineering (ISH 99), Institution Of Electrical Engineers, Stakis Metropole Hotel, London, United Kingdom, pp. 1-201.

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Abstract

Disconnector switch operation in GIS generates VFT voltages in the system. It is important, for insulation co-ordination purposes, to obtain accurate VFT V-t data for typical gap geometries found in GIS. This paper presents experimentally obtained VFT V-t data for a 180/1 lOmm co-axial gap. The VFT has a time to first peak of 35 ns and a oscillation frequency of 13,6 MHz. Due to the location of the voltage divider in a compartment adjacent to the gap, a correction factor of 1.1 is used to relate the measured breakdown voltage to that in the gap. Positive polarity VFT V-t data is presented for 1, 2, 3 and 4 bar absolute and negative polarity VFT data for 3 and 4 bar absolute. Two methods of generating the VFT's are used. The first is to power up the test transformer at power frequency. The second is to generate a switching impulse by discharging a capacitor into the primary of the test transformer.

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ID Code: 86676
Item Type: Conference Paper
Refereed: No
Additional Information: (Conf. Publ. No. 467), Volume: 1
Keywords: VFT performance, insulation co-ordination purposes, disconnector switch operation
DOI: 10.1049/cp:19990542
ISBN: 9780852967195
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 1999 Please consult the author.
Deposited On: 20 Aug 2015 05:15
Last Modified: 23 Aug 2015 11:40

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