Long-time and short-time overcurrent signal processor for circui

Details Long-time and short-time overcurrent signal processor for circui Long-time and short-time overcurrent signal processor for circui

1979-09-04

1981-05-05

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 94, H02H 3093

Patent

active

042662591

ABSTRACT:
An overcurrent signal is replicated by current mirrors for joint processing by a long-time trip mode network and a short-time trip mode network pursuant to initiating a circuit breaker trip function after an adjustably predetermined delay predicated on the overcurrent signal magnitude. The former network measures signal against a sloping I.sup.2 t portion of an established trip time curve, while the latter optionally measures the overcurrent signal against a second I.sup.2 t curve portion terminating in a selected one of plural fixed time delay curve portion. Short-time delay zone selective interlocking between upstream and downstream breakers and long-time delay pickup indication are also disclosed.

REFERENCES:
patent: 3317795 (1967-05-01), Steen
patent: 3666994 (1972-05-01), Watson et al.
patent: 4149210 (1979-04-01), Wilson
patent: 4209818 (1980-06-01), Zylstra et al.

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