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Which of the following relay is used for the protection of feeders and large busbars?
- a)Under frequency relay
- b)Buchholz relay
- c)Distance relay
- d)Differential relay
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Which of the following relay is used for the protection of feeders and...
Differential relay:
- Differential relay operation depends on the phase difference of two or more electrical quantities.
- It works on the principle of comparison between the phase angle and the magnitude of the same electrical quantities.
- The differential relay is used for the protection of the feeder, large busbars, etc.
Distance relay:
- Distance relay is widely used for the protection of high-voltage AC transmission line and distribution lines.
- Distance protection schemes are commonly employed for providing the primary or main protection and backup protection for AC transmission line and distribution line against three-phase faults, phase-to-phase faults, and phase-to-ground faults.
Under frequency relay:
- Under frequency relay is used to protect the alternator when the frequency drops below the operating frequency.
- It is a backup protection for over fluxing (V/F) protection.
- Under frequency occurs due to turbine low speed, grid frequency fluctuation, etc.
- The generator can tolerate moderate under frequency operation provided voltage is within an acceptable limit.
Buchholz relay:
- Buchholz relay protects the transformer from internal faults.
- It is the gas actuated relay.
- The Buchholz relay is placed between the main tank and the conservator.
- Buchholz relay is used in the transformer having a rating higher than 500KVA.
- It is not used in a small transformer because of economic considerations.
Most Upvoted Answer
Which of the following relay is used for the protection of feeders and...
Understanding Differential Relays
Differential relays are essential in protecting feeders and large busbars in electrical systems. Here’s a detailed explanation of why they are the correct choice for this application:
Principle of Operation
- Differential relays operate on the principle of comparing the current entering and leaving a particular section of the electrical network.
- Any difference in current signifies a fault, such as a short circuit, within that section.
Protection Scope
- They provide fast and selective protection, ensuring that only the faulty section is isolated from the rest of the system.
- This capability minimizes downtime and prevents damage to equipment.
Application in Feeders and Busbars
- In feeders, differential relays monitor the current at both ends, ensuring any disparity triggers an alarm or trip mechanism.
- For large busbars, they safeguard against internal faults which may not be detected by other forms of protection, providing a higher level of security.
Comparison with Other Relays
- Under Frequency Relay: Primarily protects against frequency drops, not effective for current faults.
- Buchholz Relay: Used for transformers, detecting gas buildup but not for feeders or busbars.
- Distance Relay: Primarily used for line protection, not specifically tailored for busbars.
Conclusion
- The differential relay is uniquely suited for the protection of feeders and large busbars due to its ability to detect internal faults quickly and accurately, ensuring system reliability and safety.
By choosing differential relays, electrical systems can achieve optimal protection and operational efficiency.
Differential relays are essential in protecting feeders and large busbars in electrical systems. Here’s a detailed explanation of why they are the correct choice for this application:
Principle of Operation
- Differential relays operate on the principle of comparing the current entering and leaving a particular section of the electrical network.
- Any difference in current signifies a fault, such as a short circuit, within that section.
Protection Scope
- They provide fast and selective protection, ensuring that only the faulty section is isolated from the rest of the system.
- This capability minimizes downtime and prevents damage to equipment.
Application in Feeders and Busbars
- In feeders, differential relays monitor the current at both ends, ensuring any disparity triggers an alarm or trip mechanism.
- For large busbars, they safeguard against internal faults which may not be detected by other forms of protection, providing a higher level of security.
Comparison with Other Relays
- Under Frequency Relay: Primarily protects against frequency drops, not effective for current faults.
- Buchholz Relay: Used for transformers, detecting gas buildup but not for feeders or busbars.
- Distance Relay: Primarily used for line protection, not specifically tailored for busbars.
Conclusion
- The differential relay is uniquely suited for the protection of feeders and large busbars due to its ability to detect internal faults quickly and accurately, ensuring system reliability and safety.
By choosing differential relays, electrical systems can achieve optimal protection and operational efficiency.
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Which of the following relay is used for the protection of feeders and large busbars?a)Under frequency relayb)Buchholz relayc)Distance relayd)Differential relayCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about Which of the following relay is used for the protection of feeders and large busbars?a)Under frequency relayb)Buchholz relayc)Distance relayd)Differential relayCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following relay is used for the protection of feeders and large busbars?a)Under frequency relayb)Buchholz relayc)Distance relayd)Differential relayCorrect answer is option 'D'. Can you explain this answer?.
Which of the following relay is used for the protection of feeders and large busbars?a)Under frequency relayb)Buchholz relayc)Distance relayd)Differential relayCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about Which of the following relay is used for the protection of feeders and large busbars?a)Under frequency relayb)Buchholz relayc)Distance relayd)Differential relayCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following relay is used for the protection of feeders and large busbars?a)Under frequency relayb)Buchholz relayc)Distance relayd)Differential relayCorrect answer is option 'D'. Can you explain this answer?.
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