Method and apparatus for detection of rotor faults in dynamoelec

Details Method and apparatus for detection of rotor faults in dynamoelec Method and apparatus for detection of rotor faults in dynamoelec

1976-12-30

1979-01-23

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

310 68R, 324158MG, G01R 3102, G01R 3302

Patent

active

041363124

ABSTRACT:
A method and apparatus are provided for detecting rotor faults in large dynamoelectric machines, such as turbine generators. Faults in the rotor windings of such machines may occur as shorted turns or as ground faults, and in either case even harmonics are produced in the field flux waveform in the air gap of the machine. The occurrence of such faults, therefore, can be detected by monitoring the flux waveform in the air gap to detect the presence of even harmonics. This may be done by means of a search coil or coils properly disposed in the air gap of the machine.

REFERENCES:
patent: 2939074 (1960-05-01), Perrett
patent: 3373300 (1968-03-01), Sullivan
patent: 3506914 (1970-04-01), Albright et al.
patent: 3624504 (1971-11-01), Joly
patent: 3855529 (1974-12-01), Langweiler
Birch et al., "Measurement of . . . the Flux-Density in . . . Machine Air Gaps", CPEM 74 Conference on Precision Electromag. Measurement, pp. 41-43, Jul. 1974.

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