Recent technology of size-reduction and large interrupting performance in development of gas circuit breakers
- Toshiba Corp., Kawasaki (Japan)
With puffer-type SF{sub 6} gas circuit breakers (GCB) in Japan, practical use at the rated voltage of 72kV was achieved in the latter half of the 1960s. Since then development has been promoted toward ever higher voltages and capacities. In the mid-1970s, 550kV 4-break GCBs came into practical use and GCBs have become the predominant high-voltage circuit breakers, covering all rated voltages. However, growing demand for electric energy and greater compactness led to the need for a higher interrupting performance per break. On the other hand, because of its high reliability and advantage of enabling substations to be much smaller, gas insulated switchgear (GIS) prevailed rapidly in Japan where it is difficult to acquire land for substations. In urban areas in particular, where substations must be constructed underground, there is demand for smaller GIS. To reduce the size of a GIS unit, studies are reviewing specifications such as temperature rise and insulation level or remodeling components into composites. Since the size of the GCB as the principal component of the GIS unit has a great effect on the entire GIS unit, when reducing the size of a GIS unit, it seems to be effective to make GCB smaller. GCB size can possibly be reduced by increasing the interrupting capacity per GCB break and by housing the 3-phase interrupting chamber in one tank, and this is further likely to help produce a compact GIS unit with the bus size greatly reduced if the GIS unit is designed skillfully. The GCB having the highest performance per break, at present, is the 550kV-63kA 1-break GCB. Three-phase common enclosed GCB up to a rated voltage of 300kV has been made practical. These GCBs enable GIS installation areas to be reduced to about 60% and 75% respectively. This paper presents the latest technologies employed for 550kV 1-break GCB and 300kV 3-phase common enclosed GCB to achieve higher performance and greater compactness.
- OSTI ID:
- 433850
- Report Number(s):
- CONF-951136-; ISBN 0-7803-2981-3; TRN: IM9709%%284
- Resource Relation:
- Conference: 1995 International conference on energy management and power delivery, Singapore (Singapore), 21-23 Nov 1995; Other Information: PBD: 1995; Related Information: Is Part Of 1995 international conference on energy management and power delivery: Proceedings. Volume 1; PB: 479 p.
- Country of Publication:
- United States
- Language:
- English
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