RECURRENT SURGE OSCILLOGRAPH
A high frequency DC step voltage impulse (12 V) is repeatedly applied using Progno RSO Pulse generator to the rotor winding at positive slipring and the reflected weaveform is recorded using Digital Oscilloscope. The RSO technique uses time domain reflectometry theory to detect faults in Rotor Winding. The process is repeated for negative slip ring and the two waveforms are superimposed to check for rotor winding abnormalities like shorted turns, earth faults, interturn faults or rotor high resistance areas. The method is largely suited for 2 pole machines for effective detection of rotor winding interturn shorts or high resistance joints.
The results will be analyzed in order to assess the Rotor winding insulation with regard to:
- INTERTURN SHORTS
- HIGH RESISTANCE JOINTS
- EARTH FAULTS