Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Reexamination Certificate
2006-03-28
2006-03-28
Leja, Ronald (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
Reexamination Certificate
active
07019951
ABSTRACT:
A technique is provided for controlling and protecting loads such as electric motors. In the technique, current sensing circuitry detects electrical current applied to the load. Device thermal modeling circuitry, such as circuitry for modeling heating of a motor, determines heating based upon the sensed current, and generates a first trip signal in a first range based upon the current. Conductor thermal modeling circuitry estimates heating of conductors that supply current to the load, and generates a second trip signal in a second range based upon the conductor heating. The system provides an extended range of operation for a wide range of loads by effectively modeling conventional thermal overload and instantaneous trip devices.
REFERENCES:
patent: 4544982 (1985-10-01), Boothman et al.
patent: 4573132 (1986-02-01), Boothman et al.
patent: 4967304 (1990-10-01), Dougherty
Blakely John Herman
Helton Gregory A.
Hurley Ricky A.
Innes Mark E.
Plemmons Roger Alan
Gerasimow Alexander M.
Leja Ronald
Rockwell Automation Technologies Inc.
Yoder Patrick S.
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