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A three-phase, 400 V ac system is connected across a delta connected load having load resistance per phase of 200 Ω. If one of the phases of the delta connected load experiences an open circuit, then power consumed by the load will be
  • a)
    2400 W    
  • b)
    1600W
  • c)
    800 W    
  • d)
    400 W
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A three-phase, 400 V ac system is connected across a delta connected l...
Initially, in closed - Δ, power consumed by the load is

= 2400W
Let, P2 be the power consumed in open delta.
then, 
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Most Upvoted Answer
A three-phase, 400 V ac system is connected across a delta connected l...
Explanation:

Given Data:
- Voltage across the load = 400 V
- Load resistance per phase = 200 Ω

Calculation:
- When one phase of the delta connected load experiences an open circuit, the load will now be effectively a star (Y) connected load.
- In a star connected load, the resistance per phase is equal to the resistance in one branch of the delta connected load.
- Therefore, the resistance per phase in the star connected load = 200 Ω

Power consumed by the load:
- Power (P) = V^2 / R
- P = 400^2 / 200
- P = 800 W
Therefore, the power consumed by the load when one phase of the delta connected load experiences an open circuit is 800 W, which corresponds to option 'B'.
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