Method for overcurrent protection

Details Method for overcurrent protection Method for overcurrent protection

1982-05-03

1984-02-14

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 94, 361 63, 364492, 364483, H02H 3093

Patent

active

044320310

ABSTRACT:
A method for detecting excessive current in a system and interrupting the delivery of further current thereto comprises determining actual system current, obtaining a value of a predetermined system parameter indicative of the time the actual system current can safely exist in the system, creating a dynamic history of the predetermined system parameter by repetitively modifying the predetermined system parameter in accordance with actual system current, and interrupting power to the system if the dynamic history of the predetermined system parameter exceeds a predetermined threshold. The predetermined system parameter may be quadratically extended into an undefined region in order to decrease the response time to an overload or fault condition.

REFERENCES:
European Patent Application No. 5324, published 11/1979; by Di Pietro et al., "A New Delayed Action Electrical Protection Device, Depending on an Adjusted Magnitude".
UK Patent Application No. 2,020,124, published 11/1979; by Matsumoto, "Overcurrent Protection".
UK Patent Application, No. 2,047,995, published 12/1980; by-Fujisawa "Protective Relay System".
Benmouyal, Gabriel, "A Log-Table Based Algorithm for Implementing Microprocessor Time-Overcurrent Relays", 1982 IEEE, pp. 1-5.

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