Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1989-07-06
1990-06-12
Jennings, Derek S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 63, 361 67, 307 64, 307113, 307115, H02H 208
Patent
active
049338021
ABSTRACT:
A gas insulated switchgear system having two gas insulated switchgear equipments, each of which consists of first disconnecting switches, circuit breakers, and second disconnecting switches, three phase gas insulated buses which are respectively connected to the first disconnecting switches of the two gas insulated switchgear equipments in every three phases thereof, a single phase reserve buses which are commonly connected to all of the second disconnecting switches of the two gas insulated switchgear equipments, and an operating device for opening the circuit breakers and the first disconnecting switches in only one phase of the gas insulated switchgear equipments and closing the second disconnecting switch in only the one phase. A gas insulated switchgear system having single phase reserve bus is economical and switches one of the three phase main buses to the single reserve bus without forming short circuit.
REFERENCES:
patent: 3714452 (1973-01-01), Williamson
patent: 4042968 (1977-08-01), Kyprcos et al.
patent: 4562359 (1985-12-01), Herzig
Fujiya Shigeru
Haginoya Mitsuga
Honda Haruo
Tsubaki Tohru
Hitachi , Ltd.
Jennings Derek S.
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