Current-squared-time (i.sup.2 t) protection system

Details Current-squared-time (i.sup.2 t) protection system Current-squared-time (i.sup.2 t) protection system

1983-01-31

1985-04-23

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 96, 361 31, H02H 3093

Patent

active

045133425

ABSTRACT:
A system for protecting an electrical component, drawing current from a power source, utilizes a sensor providing an output signal proportional to the square of the load component current. The squared-current signal, when greater than a squared-normal-current signal, is integrated and compared to a current squared-time value. A system output is enabled if the load component instantaneous i.sup.2 t value is greater than the current squared-time value set at the comparator, to remove the current flow to the protected component.

REFERENCES:
patent: 3846675 (1974-11-01), Shimp
patent: 3944890 (1976-03-01), Little
patent: 3968410 (1976-07-01), Graham
patent: 3997839 (1976-12-01), Dreyfus et al.
patent: 4012669 (1977-03-01), Gelfand et al.
patent: 4345288 (1982-08-01), Kampf et al.

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