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The neutral of the three phase 20 MVA, 11kV alternator is earthed through a resistance of 5 ohms, the relay is set to operate when there is an out of balance current of 1.5 A. The CTs have a ratio of 1000/5. What percentage of the winding is protected against L-G faults?
- a)76.4
- b)77.8
- c)73
- d)None of the mentioned
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
The neutral of the three phase 20 MVA, 11kV alternator is earthed thro...
The percentage of the winding protected against L-G faults cannot be determined with the given information.
Explanation:
- Neutral earthing resistance: The neutral of the alternator is earthed through a resistance of 5 ohms. This is done to limit the earth fault current and to maintain the voltage stability of the system.
- Relay setting: The relay is set to operate when there is an out of balance current of 1.5 A. This means that if the difference between the currents in the three phases exceeds 1.5 A, the relay will trip and isolate the faulty section.
- CT ratio: The CTs have a ratio of 100/5, which means that the secondary current is 1/20th of the primary current.
- Percentage of winding protected: The percentage of the winding protected against L-G faults depends on the type of fault, the location of the fault, and the impedance of the fault path. In this case, we do not have any information about the fault type or location.
Therefore, we cannot determine the percentage of the winding protected against L-G faults with the given information. Option D (none of the mentioned) is the correct answer.
Explanation:
- Neutral earthing resistance: The neutral of the alternator is earthed through a resistance of 5 ohms. This is done to limit the earth fault current and to maintain the voltage stability of the system.
- Relay setting: The relay is set to operate when there is an out of balance current of 1.5 A. This means that if the difference between the currents in the three phases exceeds 1.5 A, the relay will trip and isolate the faulty section.
- CT ratio: The CTs have a ratio of 100/5, which means that the secondary current is 1/20th of the primary current.
- Percentage of winding protected: The percentage of the winding protected against L-G faults depends on the type of fault, the location of the fault, and the impedance of the fault path. In this case, we do not have any information about the fault type or location.
Therefore, we cannot determine the percentage of the winding protected against L-G faults with the given information. Option D (none of the mentioned) is the correct answer.
Community Answer
The neutral of the three phase 20 MVA, 11kV alternator is earthed thro...
The given system will not protect for the LG faults, instead it will protect for earth faults.
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The neutral of the three phase 20 MVA, 11kV alternator is earthed through a resistance of 5 ohms, the relay is set to operate when there is an out of balance current of 1.5 A. The CTs have a ratio of 1000/5. What percentage of the winding is protected against L-G faults?a)76.4b)77.8c)73d)None of the mentionedCorrect answer is option 'D'. Can you explain this answer?
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The neutral of the three phase 20 MVA, 11kV alternator is earthed through a resistance of 5 ohms, the relay is set to operate when there is an out of balance current of 1.5 A. The CTs have a ratio of 1000/5. What percentage of the winding is protected against L-G faults?a)76.4b)77.8c)73d)None of the mentionedCorrect answer is option 'D'. 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 The neutral of the three phase 20 MVA, 11kV alternator is earthed through a resistance of 5 ohms, the relay is set to operate when there is an out of balance current of 1.5 A. The CTs have a ratio of 1000/5. What percentage of the winding is protected against L-G faults?a)76.4b)77.8c)73d)None of the mentionedCorrect answer is option 'D'. 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 The neutral of the three phase 20 MVA, 11kV alternator is earthed through a resistance of 5 ohms, the relay is set to operate when there is an out of balance current of 1.5 A. The CTs have a ratio of 1000/5. What percentage of the winding is protected against L-G faults?a)76.4b)77.8c)73d)None of the mentionedCorrect answer is option 'D'. Can you explain this answer?.
The neutral of the three phase 20 MVA, 11kV alternator is earthed through a resistance of 5 ohms, the relay is set to operate when there is an out of balance current of 1.5 A. The CTs have a ratio of 1000/5. What percentage of the winding is protected against L-G faults?a)76.4b)77.8c)73d)None of the mentionedCorrect answer is option 'D'. 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 The neutral of the three phase 20 MVA, 11kV alternator is earthed through a resistance of 5 ohms, the relay is set to operate when there is an out of balance current of 1.5 A. The CTs have a ratio of 1000/5. What percentage of the winding is protected against L-G faults?a)76.4b)77.8c)73d)None of the mentionedCorrect answer is option 'D'. 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 The neutral of the three phase 20 MVA, 11kV alternator is earthed through a resistance of 5 ohms, the relay is set to operate when there is an out of balance current of 1.5 A. The CTs have a ratio of 1000/5. What percentage of the winding is protected against L-G faults?a)76.4b)77.8c)73d)None of the mentionedCorrect answer is option 'D'. Can you explain this answer?.
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