RMS calculation circuit for digital circuit interrupters

Details RMS calculation circuit for digital circuit interrupters RMS calculation circuit for digital circuit interrupters

1985-06-10

1987-04-14

Paschall, M. H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 85, 361 87, 361 93, H02H 326

Patent

active

046583238

ABSTRACT:
The root mean square value of sensed current within a protected circuit is used to determine the occurrence of an overcurrent condition. A frequency multiplying circuit produces a pulse stream having a frequency proportional to the square of the amplitude of an analog signal representation of the circuit current. A root mean square value over a prescribed interval is developed from the squared current value. The RMS value is processed within an integrated circuit trip unit to determine an overcurrent condition and to operate a pair of separable contacts to interrupt the circuit current.

REFERENCES:
patent: 3739156 (1973-06-01), Gebelein, Jr. et al.
patent: 4034269 (1977-07-01), Wilkinson
patent: 4038695 (1977-07-01), De Puy
patent: 4056774 (1977-11-01), Shum
patent: 4079434 (1978-03-01), Elmore
patent: 4250449 (1981-02-01), Shum
patent: 4339722 (1982-07-01), Sydor et al.

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