Electricity: electrical systems and devices – Safety and protection of systems and devices – Feeder protection in distribution networks
Patent
1987-12-24
1989-11-07
Deboer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Feeder protection in distribution networks
361 66, 361 92, 361 5, 361 6, 307 64, 307 87, 364483, H02J 300
Patent
active
048796247
ABSTRACT:
A system is disclosed for sequentially disconnecting multiple phases of a first power source (12) from an electrical load (14) requiring a minimum of interruption and connecting a second power source (28) to the electrical load. A first embodiment of the invention disconnects immediately the phase in which a trip condition requiring disconnection of the first source power is detected and disconnects phases of a first power source (12) in which a trip condition is not detected upon the detection of zero current flow in those phases. In a second embodiment of the invention, each of the phases of the first power source (12) is disconnected immediately from the electrical load (14) upon the detection of a trip condition in any one of the phases requiring disconnection of the first power source. In both embodiments of the invention, the phases of the second backup power source (28) are connected upon the detection of the occurrence of zero voltage points in the respective phases. One of the features present in this system is an inhibiting signal which is created when the second backup power source, not on line, goes bad which prohibits a disconnection of the first power supply from the electrical load.
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Danby Clive M.
Jones Gregory D.
Owens William R.
Thiel Clifford G.
Deboer Todd E.
Sundstrand Corporation
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