Solid state circuit protection system and method

Details Solid state circuit protection system and method Solid state circuit protection system and method

1982-04-05

1983-12-27

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 87, 361 97, 364483, H02H 308

Patent

active

044234597

ABSTRACT:
A control for an AC circuit protection system which is capable of monitoring either single phase or polyphase current flow. The composite current envelope is periodically sampled and the sample values converted into digital form. Succeeding current signals are tested to determine whether they deviate from previous samples by a given amount. Non-deviant samples increment a first counter, while deviant samples increment a second counter. The ratio of the counts is used to recognize current imbalance and control system parameters are adjusted to compensate for the imbalance.

REFERENCES:
patent: 4180842 (1979-12-01), Keeney
patent: 4219858 (1980-08-01), DePuy et al.
patent: 4219860 (1980-08-01), DePuy
patent: 4241410 (1980-12-01), DePuy
patent: 4291355 (1981-09-01), Dinger
patent: 4354216 (1982-10-01), Volta
"G.E. Lod-Trab II Solid State Motor Protection Instructions", pp. 62-64, Aug. 1979.
"Programmable AC Motor Protection", Davis et al.
"Thermal Tracking-A Rational Approach to Motor Protection", Boothman et al. IEEE Transactions Paper T74029-5.

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