Prospective Method for Partial Discharge Detection in Large AC Machines using Magnetic Sensors in Low Electric Field Zones
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Prospective Method for Partial Discharge Detection in Large AC Machines using Magnetic Sensors in Low Electric Field ZonesAbstract
The aim of the paper is to present a prospective method for on-line monitoring of partial discharge (PD) in large AC motors. The principle of this system consists to measure the weak high frequency magnetic field, due to PD, in the space between the magnetic core and the external frame of large generators. Special sensor, with a bandwidth adapted to the resonance frequencies of the machine winding, can perform such weak-field measurements. With several sensors, it will be possible to localize PD activities corresponding to insulation weaknesses.
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