Rotor Pull Proved Unnecessary Using RIV and ELCID Excerpt from”Rotor Pull Proved Unnecessary Using RIV and ELCID”, W. McDermid Company: Manitoba Hydro Machine Description: Hydrogen Cooled Synchronous Condenser, 300 MVA, 13.8 kV, 900RPM Ground Fault Detected After Repairs: A major overhaul had been completed on a 300 MVA 13.8 kV 900 rpm hydrogen cooled synchronous condenser. Three days after the machine had been returned to commercial service, a stator ground fault occurred. The ground fault was as a result of a small metallic tool had been left in the rotor during an overhaul. The object had entered the air gap and damaged the end arms of three stator bars, one of which failed. Figure 1: Stator Bar DamageThe OEM patched the three stators bars. A series of off-line electrical tests were pe

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