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Two-wattmeter method is employed to measure power in a 3-phase balanced system with the current coils connected in the A and C lines. The phase sequence is ABC. If the wattmeter with its current coil in A-phase line reads zero, then the power factor of the 3-phase load will be
- a)zero lagging
- b)zero leading
- c)0.5 lagging
- d)0.5 leading
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Two-wattmeter method is employed to measure power in a 3-phase balance...
When power factor = 0.5 (φ = 60°), then one wattmeter will read zero. The load will be lagging in nature.
W1 = VLIL cos (30 + φ)
and W2 = VLIL cos (30 - φ)
For φ = 60°, W1 = 0 watt
W1 = VLIL cos (30 + φ)
and W2 = VLIL cos (30 - φ)
For φ = 60°, W1 = 0 watt
Most Upvoted Answer
Two-wattmeter method is employed to measure power in a 3-phase balance...
Explanation:
Two-wattmeter method:
- The two-wattmeter method is commonly used to measure power in a 3-phase balanced system.
- Two wattmeters are connected in the system, typically with their current coils in two of the three phase lines.
Given scenario:
- In this case, the current coils of the wattmeters are connected in the A and C lines.
- The wattmeter with its current coil in the A-phase line reads zero.
Interpretation:
- When one of the wattmeters reads zero in a 3-phase balanced system, it indicates that the power in that particular phase is zero.
- This implies that the power is being consumed by the load is coming from the other two phases.
Power factor calculation:
- In a 3-phase system with balanced loads, the power factor is typically calculated as the cosine of the phase angle between the voltage and current waveforms.
- Since the power in the A-phase line is zero, it means that the current in that phase is also zero.
- The power factor can be calculated as the power consumed in the C-phase line divided by the total power consumed by the load.
Conclusion:
- Therefore, in this scenario, the power factor of the 3-phase load will be 0.5 lagging, as the power is being supplied primarily by the C-phase line.
Two-wattmeter method:
- The two-wattmeter method is commonly used to measure power in a 3-phase balanced system.
- Two wattmeters are connected in the system, typically with their current coils in two of the three phase lines.
Given scenario:
- In this case, the current coils of the wattmeters are connected in the A and C lines.
- The wattmeter with its current coil in the A-phase line reads zero.
Interpretation:
- When one of the wattmeters reads zero in a 3-phase balanced system, it indicates that the power in that particular phase is zero.
- This implies that the power is being consumed by the load is coming from the other two phases.
Power factor calculation:
- In a 3-phase system with balanced loads, the power factor is typically calculated as the cosine of the phase angle between the voltage and current waveforms.
- Since the power in the A-phase line is zero, it means that the current in that phase is also zero.
- The power factor can be calculated as the power consumed in the C-phase line divided by the total power consumed by the load.
Conclusion:
- Therefore, in this scenario, the power factor of the 3-phase load will be 0.5 lagging, as the power is being supplied primarily by the C-phase line.
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Two-wattmeter method is employed to measure power in a 3-phase balanced system with the current coils connected in the A and C lines. The phase sequence is ABC. If the wattmeter with its current coil in A-phase line reads zero, then the power factor of the 3-phase load will bea)zero laggingb)zero leadingc)0.5 laggingd)0.5 leadingCorrect answer is option 'C'. Can you explain this answer?
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Two-wattmeter method is employed to measure power in a 3-phase balanced system with the current coils connected in the A and C lines. The phase sequence is ABC. If the wattmeter with its current coil in A-phase line reads zero, then the power factor of the 3-phase load will bea)zero laggingb)zero leadingc)0.5 laggingd)0.5 leadingCorrect answer is option 'C'. 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 Two-wattmeter method is employed to measure power in a 3-phase balanced system with the current coils connected in the A and C lines. The phase sequence is ABC. If the wattmeter with its current coil in A-phase line reads zero, then the power factor of the 3-phase load will bea)zero laggingb)zero leadingc)0.5 laggingd)0.5 leadingCorrect answer is option 'C'. 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 Two-wattmeter method is employed to measure power in a 3-phase balanced system with the current coils connected in the A and C lines. The phase sequence is ABC. If the wattmeter with its current coil in A-phase line reads zero, then the power factor of the 3-phase load will bea)zero laggingb)zero leadingc)0.5 laggingd)0.5 leadingCorrect answer is option 'C'. Can you explain this answer?.
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