Similar to type 2 and 3, this internal fault is between two windings of the same phase. To realize a type 6 fault (winding-winding), Rfg must be kept very large during the fault while a type7 fault, winding-winding-ground, the grounding resistor must be stepped down to a very small value.
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Type 6 and 7 Fault in a Synchronous Machine with Two Parallel Windings and Neutral Impedance