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Grounding Brush or Ground has lost continuity. |
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Stator core lamination shorting in an electrical generator. |
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Self-excitation or compounding of shaft voltages and grounding currents from shorted rotor coil. |
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Shaft Rubs at bearings, seals due to oil whip, coupling misalignment, thermal growth, loss of lubrication, impurities in the oil, etc. |
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Loss of or Shorting of Insulation at Bearings, Seals and Coupling, etc. |
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Diode Failure in Generator Excitation |
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Excessive Sparking at Collector Ring Brushes. |
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Intermittent Rotor Winding Ground Fault. |
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Excessive transients in pulse width modulated rotor and/or stator electrical supply. |
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Dry Steam conditions at the inlet of the turbine with partial admission, caused charge separation and spark discharge. |
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Wet steam conditions at the exhaust end of the turbine causing charge separation with possible blade erosion and cavitation. |
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