Abstract
A compact 550 kV gas-insulated substation (GIS) is developed by applying new single break gas circuit breaker (GCB). The interrupter for the single break GCB has to cope with nearly twice the voltage compared with the double break GCB. This paper discusses mainly the development of the single break 550 kV GCB which had its focal point on the interrupter design and the arrangement of the resistor unit. Furthermore, discussions are made on the various advantages of employing the single break GCB on the layout of 550 kV GIS.
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