Reliable fault tolerant power supply for a protective relay

Details Reliable fault tolerant power supply for a protective relay Reliable fault tolerant power supply for a protective relay

1998-03-16

1999-09-28

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 79, H02H 300

Patent

active

059598190

ABSTRACT:
The protective relay is primarily energized by a voltage transformer tap on the power circuit. The current transformers that provide the monitoring current to the protective relay also provide an auxiliary power input to the power supply circuit. A switching circuit monitors the input voltage and switches to the current feed to generate the relay supply voltage when the input voltage drops below a predetermined level. In one embodiment the fault tolerant power supply is provided as an optional, modular, add on unit. In a second embodiment, the power supply is an integral part of the protective relay where the current shares a common input between the monitoring and power circuit and the voltage input is common to both the power supply and any metering circuits contained within the protective relay.

REFERENCES:
patent: 4352138 (1982-09-01), Gilker
patent: 4398232 (1983-08-01), Elmore

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