Static overcurrent trip device to operate a circuit breaker in r

Details Static overcurrent trip device to operate a circuit breaker in r Static overcurrent trip device to operate a circuit breaker in r

1983-07-13

1986-02-18

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 97, 361 31, H02H 3093

Patent

active

045716595

ABSTRACT:
The analog electronic trip device comprises a time-lag tripping circuit formed by a non-linear function generator likely to elaborate by approximation the tripping characteristic of the circuit breaker.
The device includes an integrating amplifier comprising a negative-feedback capacitor C and two inputs in phase opposition. One of the inputs is submitted to two threshold voltages V.sub.R1, V.sub.R2 determining the mode of long-time delay or short-time delay operation of the trip device. The second threshold voltage V.sub.R2 is set by a resistive switch which determines the short delay tripping threshold.

REFERENCES:
patent: 3558978 (1971-01-01), Nye, Jr. et al.
patent: 3900785 (1975-08-01), Alric et al.
patent: 3942074 (1976-03-01), Graham
patent: 4278930 (1981-07-01), Rogers
patent: 4345288 (1982-08-01), Kampf et al.
patent: 4347541 (1982-08-01), Chen et al.

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