Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > While a transformer is energised, the differe...
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While a transformer is energised, the differentially connected relay will
- a)mal operate
- b)not mal operate
- c)mal operate for lagging loads
- d)never mal operate
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
While a transformer is energised, the differentially connected relay w...
Understanding Differential Relays in Transformers
When a transformer is energized, the performance of differentially connected relays is crucial for system protection. Let's explore why the correct answer is that these relays will mal operate.
What is a Differential Relay?
- Differential relays are designed to detect discrepancies between the input and output currents of the transformer.
- They are typically used to identify faults and protect equipment by isolating faulty sections of the circuit.
Why Mal Operation Occurs?
- When the transformer is energized, inrush currents can occur, which are significantly higher than normal operating currents.
- This current surge can cause the differential relay to sense a difference in the input and output currents, leading to mal operation.
Inrush Current Phenomenon
- Inrush currents are transient and can last for a few cycles during the initial energization of the transformer.
- Differential relays may interpret these high currents as a fault, triggering an unnecessary trip.
Factors Contributing to Mal Operation
- Magnitude of Inrush Current: The initial surge can reach several times the rated current, overwhelming the relay's threshold.
- Relay Settings: If the relay settings are not appropriately configured to account for inrush conditions, it will lead to mal operation.
Conclusion
In conclusion, when a transformer is energized, the differential relay may mal operate due to the high inrush currents that exceed normal operational levels. Understanding this behavior is essential for engineers to ensure proper relay settings and prevent unnecessary tripping during start-up conditions.
When a transformer is energized, the performance of differentially connected relays is crucial for system protection. Let's explore why the correct answer is that these relays will mal operate.
What is a Differential Relay?
- Differential relays are designed to detect discrepancies between the input and output currents of the transformer.
- They are typically used to identify faults and protect equipment by isolating faulty sections of the circuit.
Why Mal Operation Occurs?
- When the transformer is energized, inrush currents can occur, which are significantly higher than normal operating currents.
- This current surge can cause the differential relay to sense a difference in the input and output currents, leading to mal operation.
Inrush Current Phenomenon
- Inrush currents are transient and can last for a few cycles during the initial energization of the transformer.
- Differential relays may interpret these high currents as a fault, triggering an unnecessary trip.
Factors Contributing to Mal Operation
- Magnitude of Inrush Current: The initial surge can reach several times the rated current, overwhelming the relay's threshold.
- Relay Settings: If the relay settings are not appropriately configured to account for inrush conditions, it will lead to mal operation.
Conclusion
In conclusion, when a transformer is energized, the differential relay may mal operate due to the high inrush currents that exceed normal operational levels. Understanding this behavior is essential for engineers to ensure proper relay settings and prevent unnecessary tripping during start-up conditions.
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While a transformer is energised, the differentially connected relay w...
There will be flow of inrush current at the energization of transformer which will let relay may operate.
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While a transformer is energised, the differentially connected relay willa)mal operateb)not mal operatec)mal operate for lagging loadsd)never mal operateCorrect answer is option 'A'. 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 While a transformer is energised, the differentially connected relay willa)mal operateb)not mal operatec)mal operate for lagging loadsd)never mal operateCorrect answer is option 'A'. 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 While a transformer is energised, the differentially connected relay willa)mal operateb)not mal operatec)mal operate for lagging loadsd)never mal operateCorrect answer is option 'A'. Can you explain this answer?.
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