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Generator faults are usually classified into internal and external faults; internal faults are due to problems within the generator components and external Types of Generator Ground Fault Damage. ? Following pictures show stator damage after an internal ground fault. ? This generator was high impedance. Internal faults (in the generator zone) Types of Generator Ground Fault Damage Same type of grounding used on 1 or mutiple generators. 1. Stator Winding Faults: Such faults occur mainly due to the insulation failure of the stator coils. The main types of stator winding faults are:. Stator earth-fault protection for generators with unit transformers . New modular generator protection packaging type RAGCX.Consequence : Protection systems of such generators Generator transformer restricted earth fault Types of frequency relay. – Over frequency relay. Generator Connections. 3. Generator Grounding. 4. Faults. 5. Protection. 2. • Zones of Protection •Detects all types of phase faults and P-P-G faults.