Circuit breaker with digital solid-state trip unit with optional

Details Circuit breaker with digital solid-state trip unit with optional Circuit breaker with digital solid-state trip unit with optional

1986-02-10

1987-09-15

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 50, 361 42, 307 38, 307 39, 364483, H02H 308

Patent

active

046943730

ABSTRACT:
Digital solid-state trip unit designed to provide protection against phase faults, notably overloads and short-circuits and optional functions, in this case ground fault protection and load shedding and restoring functions. Two parameter input switches (72, 74) are assigned to the optional functions to display, in the ground protection option the ground protection pick-up and the ground protection time delay, and in the load shedding option, the load restoring pick-up and the load shedding pick-up. Each option has a software program stored in a non-volatile memory corresponding to it.

REFERENCES:
patent: 4291355 (1981-09-01), Dinger
patent: 4324987 (1982-04-01), Sullivan et al.
patent: 4351012 (1982-09-01), Elms et al.
patent: 4371947 (1983-02-01), Fujisawa
patent: 4377836 (1983-03-01), Elms et al.
patent: 4544982 (1985-10-01), Boothman et al.
patent: 4589052 (1986-05-01), Dougherty

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