Method for determining the state of strength of winding overhang

Details Method for determining the state of strength of winding overhang Method for determining the state of strength of winding overhang

1997-12-05

2000-04-04

Ballato, Josie

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324545, 73660, G01R 3134

Patent

active

060466022

ABSTRACT:
In a method for determining the state of strength of winding overhangs (2) of electric machines, at least one sensor (3), which is arranged on a winding end (4) of a winding overhang (2) and is connected to an evaluation unit (5) is used to determine a vibration amplitude (A) of the winding end (4), and the associated phase (.phi.). The phase (.phi.) of the vibration amplitude (A) is determined in this case with reference to a phase of an electric current flowing through the winding end (4). The quotient (.DELTA.A) of the vibration amplitude (A) and an amplitude reference (A.sub.ref) dependent on the electric current, and the quotient (.DELTA..phi.) of the phase (.phi.) of the vibration amplitude (A) and a phase reference (.phi..sub.ref) dependent on the temperature of the winding overhang (2) permit the state of strength of winding overhangs to be determined and causes to be located in the event of a change in the vibration amplitude.

REFERENCES:
patent: 4321464 (1982-03-01), Miller
patent: 5469745 (1995-11-01), Twerdochlib
patent: 5675497 (1997-10-01), Petsche et al.
patent: 5684718 (1997-11-01), Jenkins et al.
"On-Line Vibration Monitoring of End Windings by Means of a Fiber-Optic Accelerometric System", Mariottini, et al., Utility Motor and Generator Predictive Maintenance and Refurbishment, Nov. 1995.
"Modern Monitoring Used for Life Management of Generators", Huber, et al.
"Modern Monitoring used for Life Management of Generators", Albert Huber, Albert Kopp, ABB Power Generation Ltd., Conference Proceedings, "Electron", SAIEE-Journal, Sep. 1993.

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