Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1979-05-15
1980-12-09
Moose, Jr., Harry E.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
322 99, 324 52, 361 20, G01R 3134
Patent
active
042387337
ABSTRACT:
A corona discharge monitor system for a dynamoelectric machine, particularly for large salient pole generators, has an antenna mounted on a rotor pole. The antenna sweeps over the stator slots and picks up radio frequency signals produced by corona activity occurring in the structure of the stator bars. A rotary coupler, having a rotating portion fixed to the shaft of the machine and a fixed portion adjacent to the rotating portion, couples the signal to a signal conditioner. A trigger signal synchronized with the rotor rotation and with a known reference to antenna position and derived from the power system line frequency, is used as one input to a storage device such as a variable persistence oscilloscope. A first output of the signal conditioner represents the peak amplitude of the corona discharge and a second output represents the number of corona occurrences and these are applied to the storage device. A display is provided with reference to the trigger signal in such a way as to associate the first or second output with each slot, or if not a particular slot, at least within a limited number of slots.
REFERENCES:
patent: 4156846 (1979-05-01), Harrold et al.
patent: 4164705 (1979-08-01), Whitney et al.
"Airborne Scanner Detects Transmission Line Problems", Transmission and Distribution, vol. 24, No. 4, 4/72 324/52.
Canadian General Electric Company Limited
Eckersley R. A.
Moose Jr. Harry E.
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