Corona discharge monitor system

Details Corona discharge monitor system Corona discharge monitor system

H - Electricity

02

K

324/17

H02K 11/00 (2006.01) G01R 31/34 (2006.01) H02H 7/06 (2006.01)

Patent

CA 1078017

ABSTRACT OF THE DISCLOSURE A corona discharge monitor system for a dynamo- electric 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 persistance 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.

282831

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