Motor protection device

Details Motor protection device Motor protection device

1979-08-28

1982-03-09

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 27, 361 44, H02H 708

Patent

active

043192980

ABSTRACT:
A motor protection device is provided that monitors motor currents and motor temperatures and provides protective functions whose characteristics are based on field settable data and motor operating conditions. The protective functions provided are overtemperature, overload, instantaneous overcurrent, ground fault, phase unbalance, and phase reversal. Field settable data is entered by means of a keyboard and consists of motor trip points for the protective functions, and motor and system parameters.

REFERENCES:
patent: 3845354 (1974-10-01), Boothman et al.
patent: 3848160 (1974-11-01), Boothman et al.
patent: 3979657 (1976-09-01), Yorksie
patent: 3984737 (1976-10-01), Okamura et al.
patent: 4041540 (1977-09-01), Kampf et al.
patent: 4097790 (1978-06-01), Wilson
patent: 4219858 (1980-08-01), De Puy et al.
"Thermal Tracking-A Rational Approach to Motor Protection"-Boothman et al., IEEE Paper T 74 029-5.

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