alternator is protected by balanced system has its neutral grounded through a resistance of 12 Ohm. The protective relay is set to operate when there is an out of balance current of 0.6 A in the pilot wires which are connected to the secondary of current transformer of ratio 800/5. Calculate: A- The percentage of protected winding -B- The resistance required to decrease the unprotected percentage by 15%.

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A 6 kV alternator is protected by balanced system has its neutral grounded through
a resistance of 12 Ohm. The protective relay is set to operate when there is an out
of balance current of 0.6 A in the pilot wires which are connected to the secondary
of current transformer of ratio 800/5. Calculate: A- The percentage of protected
winding -B- The resistance required to decrease the unprotected percentage by
15%
Transcribed Image Text:Q3 A 6 kV alternator is protected by balanced system has its neutral grounded through a resistance of 12 Ohm. The protective relay is set to operate when there is an out of balance current of 0.6 A in the pilot wires which are connected to the secondary of current transformer of ratio 800/5. Calculate: A- The percentage of protected winding -B- The resistance required to decrease the unprotected percentage by 15%
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