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Table 2 Torque limits of the occurrence of Georges phenomenon

From: Dynamic investigation of Georges phenomenon related to three-phase wound-rotor induction motor

Rotor connectionInstant of faultThe value of load torqueGorges phenomenon
Isolated neutral starStarting with opening one phaseUp to full loadOccurs
Opening one phase during normal operation< 67% of its full loadDoes not occur
Standard delta connection with external open phaseStarting with opening one phaseUp to full loadOccurs
Opening one phase during normal operation< 67% of its full loadDoes not occur
Standard delta connection with internal open phaseStarting with opening one phase< 87.5% of its full loadDoes not occur
Opening one phase during normal operationUp to full loadDoes not occur
Delta connection with reversed one phase and external open circuitStarting with opening one phaseUp to full loadDoes not occur
Opening one phase during normal operationUp to full loadDoes not occur