Techniques for the protection of gas-insulated substation to cable interfaces

Journal Article · Sat Oct 01 04:00:00 EDT 1988 · IEEE Trans. Power Del.; (United States)

DOI:https://doi.org/10.1109/61.193967· OSTI ID:6495523

Fujimoto, N; Croall, S J; Foty, S M ^[1]

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1. Ontario Hydro, Toronto, Ontario (CA)

Line-to-ground faults in gas-insulated substations (GIS) generate fast nanosecond risetime transients which cause sparkovers across the insulated flange of high pressure oil filled cable/GIS interfaces. The ionized path formed by the sparkovers creates a low-impedance path for power frequency fault current, resulting in flange damage with potentially serious consequences. Various techniques for protecting the insulating flange from such damage are investigated and discussed, both in terms of new designs and in terms of retrofits for existing installations. In order to be effective, each protection scheme must adequately deal with the fast transients generated by breakdown in the GIS. As the frequencies of these transients are 1 to 2 orders of magnitude higher than for ''conventional'' power system transients, special considerations are necessary in the protection scheme chosen.

• OSTI ID: 6495523
• Journal Information: IEEE Trans. Power Del.; (United States), Journal Name: IEEE Trans. Power Del.; (United States) Vol. 3:4; ISSN ITPDE
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200104* -- Fossil-Fueled Power Plants-- Components
200300 -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
BREAKDOWN
CABLES
CONDUCTOR DEVICES
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
ELECTRICAL FAULTS
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
GAS-INSULATED SUBSTATIONS
HIGH PRESSURE
POWER SUBSTATIONS