Microcomputer based reclosing relay

Details Microcomputer based reclosing relay Microcomputer based reclosing relay

1989-12-01

1991-02-19

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Automatic reclosing

361 75, 361 92, 364483, H02H 722

Patent

active

049949349

ABSTRACT:
A microcomputer based reclosing relay performs a number of sequences to generate a succession of reclosure signals for a circuit breaker at timed intervals. The digital processing unit of the relay maintains flags, counts and running times for generating the succession of timed reclosures in a volatile memory. Periodically, these flags, counts and running times are copied to a non-volatile memory such as an EEPROM. Upon restoration of power following an interruption of power which results in loss of the contents of the volatile memory, the digital processing unit recopies the flags, counts and running times saved in the non-volatile memory back into the volatile memory, so that the relay can resume generating the succession of reclosures from the point at which power was lost. The flags and counts are copied to the EEPROM only when they change state, while the running times are only saved once a second to prolong the service life of the EEPROM.

REFERENCES:
patent: 4454556 (1984-06-01), De Puy
patent: 4535409 (1985-08-01), Jindrick et al.
patent: 4670812 (1987-06-01), Doerfler et al.
patent: 4680706 (1987-07-01), Bray
patent: 4931890 (1990-06-01), Le Court

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