Electricity: electrical systems and devices – Safety and protection of systems and devices – Feeder protection in distribution networks
Patent
1985-07-30
1987-05-05
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Feeder protection in distribution networks
361 79, H02H 722
Patent
active
046636919
ABSTRACT:
A safety mechanism is described which is used in an electrical distributing system with a bus-bar and of branches emanating from the bus-bar and has safety relays which turn off the malfunctioning part of the system in case of error. In this safety mechanism, redundancy is increased with respect to a malfunctioning of any one of the relays while the number of safety relays remains the same. This is achieved by the fact that each of the safety relays responds to a measurement of currents and voltages of two branches and acts upon both branches via the switches separating them from the mains.
REFERENCES:
patent: 3963964 (1976-06-01), Mustaphi
patent: 4432031 (1984-02-01), Premerlani
BBC Brown Boveri & Company Limited
Pellinen A. D.
Williams H. L.
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