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An alternator rated at 10 kV is protected by the balanced circulating current system. It has its neutral grounded through a resistance of 10Ω . The protective relay is set to operate when there is an out of balanced current of 1.8 A in the pilot wires, which are connected to the secondary windings of 1000/5 ratio current transformers. What is the percent winding which remains unprotected? (Answer up to two decimal places)
    Correct answer is '62.36'. Can you explain this answer?
    Most Upvoted Answer
    An alternator rated at 10 kV is protected by the balanced circulating ...
    The phase voltage of the alternator
    = 1000√3 = 5773 volts
    Let x% be the percent winding which remains unprotected.The voltage of the unprotected portion of the winding
    Vunprotected = 5773(x/100)
    Since the resistance in the neutral 10 ohms the fault current will be
    If = 5773(x/100)(1/10) amp.
    The current in the pilot wires will be with a CT of 1000/5 amps ratio
    And this current should be equal to 1.8 amps for the operation of the relay.
    5773(x/100)(1/10)(5/1000)=1.8
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    An alternator rated at 10 kV is protected by the balanced circulating current system. It has its neutral grounded through a resistance of 10Ω . The protective relay is set to operate when there is an out of balanced current of 1.8 A in the pilot wires, which are connected to the secondary windings of 1000/5 ratio current transformers. What is the percent winding which remains unprotected? (Answer up to two decimal places)Correct answer is '62.36'. Can you explain this answer?
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    An alternator rated at 10 kV is protected by the balanced circulating current system. It has its neutral grounded through a resistance of 10Ω . The protective relay is set to operate when there is an out of balanced current of 1.8 A in the pilot wires, which are connected to the secondary windings of 1000/5 ratio current transformers. What is the percent winding which remains unprotected? (Answer up to two decimal places)Correct answer is '62.36'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about An alternator rated at 10 kV is protected by the balanced circulating current system. It has its neutral grounded through a resistance of 10Ω . The protective relay is set to operate when there is an out of balanced current of 1.8 A in the pilot wires, which are connected to the secondary windings of 1000/5 ratio current transformers. What is the percent winding which remains unprotected? (Answer up to two decimal places)Correct answer is '62.36'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An alternator rated at 10 kV is protected by the balanced circulating current system. It has its neutral grounded through a resistance of 10Ω . The protective relay is set to operate when there is an out of balanced current of 1.8 A in the pilot wires, which are connected to the secondary windings of 1000/5 ratio current transformers. What is the percent winding which remains unprotected? (Answer up to two decimal places)Correct answer is '62.36'. Can you explain this answer?.
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