Long delay acceleration module for an overload relay system

Details Long delay acceleration module for an overload relay system Long delay acceleration module for an overload relay system

1975-06-02

1977-01-11

Envall, Jr., R. N.

317 36TD, 317 49, 317 38, H02H 708

Patent

active

040029484

ABSTRACT:
A long acceleration module is provided for use with a current sensor which provides an output voltage which varies with load current. There is also provided an inverse time overload logic module which controls the tripping of a circuit breaker to protect the lines in which the load current flows in relationship to the output voltage of the current sensor. The long acceleration module allows motor startup when a motor is connected to the lines to be protected. The long acceleration module purposely simulates a relatively low voltage for the input to the inverse time overload logic module during the motor startup time when high but generally non-dangerous currents are drawn by the accelerating motor.

REFERENCES:
patent: 2914702 (1959-11-01), Diebold
patent: 3602783 (1971-08-01), Engle et al.
patent: 3739229 (1973-06-01), Moran

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