9424200994 Rev N 73
Stator Ground (64G) Protection
The BE1-11g provides ground protection for 100% of the stator winding on high-impedance, grounded
generators. This protection is implemented by using the 27X element in Vx Third Harmonic mode and the
59X element in Vx Fundamental mode. The 59X element detects winding ground faults in approximately
85% of the winding. Faults closer to the generator neutral do not result in high neutral voltage but are
detected by the 27X element using third harmonic voltages. The combination of these two measuring
methods provides ground fault protection for the full winding.
Refer to the Auxiliary Undervoltage (27X) Protection and Auxiliary Overvoltage (59X) Protection chapters
for information on how to configure the Vx Third Harmonic undervoltage and Vx Fundamental overvoltage
modes of the 27X and 59X elements.
BE1-11g Stator Ground (64G) Protection
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