High speed bus differential relay

Details High speed bus differential relay High speed bus differential relay

1977-03-04

1978-05-09

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transient nonresponsive

361 63, 361 94, H02H 328

Patent

active

040890333

ABSTRACT:
This high-speed differential protective arrangement discriminates between a fault occurring in a differentially-protected zone of a power circuit and operation of a lightning arrestor connected to the power circuit in said zone. The protective arrangement comprises a relay which operates in response to such a fault but which remains inactive despite operation of the lightning arrestor. Despite this insensitivity to lightning-arrestor operations, the relay is still able to operate relatively fast at levels of fault-produced voltage across input terminals to the protective arrangement much lower than those developed across these terminals by lightning-arrestor follow-through current.

REFERENCES:
patent: 2548625 (1951-04-01), Seeley
patent: 3259802 (1966-07-01), Steen
patent: 4025821 (1977-05-01), Lang

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