Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1991-04-18
1993-06-15
Stephan, Steven L.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 25, 340643, H02H 708
Patent
active
052204782
ABSTRACT:
A method and apparatus for remotely displaying information about heat in a motor having an associated motor-starting contactor with an overload relay system is provided. The apparatus includes a suitably programmed microprocessor which obtains a signal representative of current in the motor, squares the current and multiplies by time. This actual I.sup.2 t value is then used to calculate a signal representative of a relationship between the actual I.sup.2 t value and a target value at which the contacts of the motor-starting contactor will open due to an overload current situation. This relationship is preferably a percentage which is then displayed on either an LED bar type display or a digital display. The display may also include a "trip" indicator and a "reset allowed" indicator.
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patent: 4767420 (1988-07-01), Saletta et al.
patent: 4827369 (1989-05-01), Saletta et al.
patent: 4875152 (1989-10-01), Foster
Hurley Rick A.
Innes Mark E.
Moran M. J.
Stephan Steven L.
To E.
Westinghouse Electric Corp.
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