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

Journal of Electrical Systems and Information Technology

Table 2 Torque limits of the occurrence of Georges phenomenon

Rotor connection	Instant of fault	The value of load torque	Gorges phenomenon
Isolated neutral star	Starting with opening one phase	Up to full load	Occurs
Isolated neutral star	Opening one phase during normal operation	< 67% of its full load	Does not occur
Standard delta connection with external open phase	Starting with opening one phase	Up to full load	Occurs
Standard delta connection with external open phase	Opening one phase during normal operation	< 67% of its full load	Does not occur
Standard delta connection with internal open phase	Starting with opening one phase	< 87.5% of its full load	Does not occur
Standard delta connection with internal open phase	Opening one phase during normal operation	Up to full load	Does not occur
Delta connection with reversed one phase and external open circuit	Starting with opening one phase	Up to full load	Does not occur
	Opening one phase during normal operation	Up to full load	Does not occur