Electronic overload relay for mains-fed induction motors

Details Electronic overload relay for mains-fed induction motors Electronic overload relay for mains-fed induction motors

2005-05-09

2009-08-04

Hollington, Jermele (Department: 2829)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

Reexamination Certificate

active

07570074

ABSTRACT:
An induction motor having a rotor and a stator is protected during running overloads by connecting the motor to an overload protection relay that can be tripped to interrupt power to the motor in the event of an overload, tracking the stator winding temperature of the motor during running overloads with a hybrid thermal model by online adjustment in the hybrid thermal model, and tripping the overload protection relay in response to a predetermined running overload condition represented by the tracked stator winding temperature. In one embodiment of the invention, the stator winding temperature is tracked by use of an online hybrid thermal model that uses the resistance of the rotor as an indicator of rotor temperature and thus of the thermal operating conditions of the motor. The hybrid thermal model incorporates rotor losses and heat transfer between the rotor and the stator, and approximates the thermal characteristics of the rotor and stator.

REFERENCES:
patent: 4319298 (1982-03-01), Davis et al.
patent: 4413325 (1983-11-01), Elfner et al.
patent: 4914386 (1990-04-01), Zocholl
patent: 4980624 (1990-12-01), Bernhardt
patent: 4987674 (1991-01-01), Denk
patent: 5283708 (1994-02-01), Waltz
patent: 5436784 (1995-07-01), Schweitzer, III et al.
patent: 5761018 (1998-06-01), Blakely
patent: 6621291 (2003-09-01), Lee et al.
patent: 6847187 (2005-01-01), Kumar
patent: 2004/0206341 (2004-10-01), Clarkson et al.
patent: 2006/0176005 (2006-08-01), Ta et al.
Sang-Bin Lee, Thomas G. Habetler, Ronald G. Harley, David J. Gritter; An Evaluation of Model-Based Stator Resistance Estimation for Induction Motor Stator Winding Temperature Monitoring; Mar. 2002; IEEE Transactions on Energy Conversion, vol. 17, No. 1.
Hurst K D et al.: “A Thermal Monitoring and Parameter Tuning Scheme for Induction Machines” IEEE Industry Applications Conference, 1997. New Orleans, LA, USA, Conference Record of the 1997 IEEE , Oct. 5-9, 1997, NY,NY, vol. 1, pp. 136-142.
Kral C et al: “Rotor Temperature Estimation of Squirrel Cage Induction Motors by Means of a Combined Scheme of Parameter Estimation and a Thermal Equivalent Model” Electric Machines & Drives Conference 2003. IEMDC '03. IEEE Jun. 1-4, 2003, vol. 2, pp. 931-937.
Beguenane R et al: “Induction Motors Thermal Monitoring by Means of Rotor Resistance Identification” IEEE Transactions on Energy Conversion, IEEE Service Center Piscataway, NJ vol. 14, No. 3, Sep. 1999, pp. 566-570.
Gao Z et al: “An Online Adaptive Stator Winding Temperature Estimator Based on a Hybrid Thermal Model for Induction Machines” Electric Machines and Drives, 2005 IEEE Conf. Piscataway, NJ, USA, May 15, 2005, pp. 754-761.

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