Induction machine protection device

Details Induction machine protection device Induction machine protection device

1996-06-12

1997-07-01

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 78, 361 23, 318802, 318805, H02H 504

Patent

active

056444583

ABSTRACT:
A device and apparatus for monitoring faults in a three phase induction machine are disclosed herein. The device and method utilize values of the currents in the three phases and the voltages of the three phases to estimate a current portion which is not substantially affected by the load torque effects of the machine. This current portion is related to the unacceptable magnetic fields present in the machine. These fields are typically caused by electrical or mechanical problems in the machine, and when the current portion exceeds a predetermined limit, operation of the machine can be discontinued.

REFERENCES:
patent: 3845354 (1974-10-01), Boothman et al.
patent: 4319298 (1982-03-01), Davis et al.
patent: 4647825 (1987-03-01), Profio et al.
patent: 4939437 (1990-07-01), Farag et al.
patent: 5345158 (1994-09-01), Kliman et al.
patent: 5570256 (1996-10-01), Schoen et al.
IQ-1000 Motor Protection System User's Manual, 1987, Control Division, Westinghouse Electric Corporation.
IQ-2000 Motor Command System: A New Concept in Motor Command, Dennis Mueller, Sr. Engineer, General Control Div., Westinghouse Electric Corporation.

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