Motor protection relay using thermal models

Details Motor protection relay using thermal models Motor protection relay using thermal models

1993-08-11

1995-07-25

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 27, 361103, H02H 708

Patent

active

054367840

ABSTRACT:
The motor relay includes thermal models representing the start and run conditions of a motor. The thermal models are implemented using measured current values and certain known operating parameters available from the manufacturer, specifically full load current, locked rotor thermal time and rated service factor. The thermal model information is compared with threshold thermal model values to determine when an overload condition has been reached.

REFERENCES:
patent: 4547826 (1985-10-01), Premerlani
patent: 4743818 (1988-05-01), Quayle et al.

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