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In the system shown in the figure, a static three-phase capacitor of reactance 1 pu per phase is connected through a switch at motor bus bar. The internal voltage and reactances are specified. The steady state power limits when the switch is open and closed respectively are
  • a)
    0.4 pu, 0.5 pu
  • b)
    0.5 pu, 0.4 pu
  • c)
    0.5 pu, 0.76 pu
  • d)
    0.4 pu, 1.58 pu
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
In the system shown in the figure, a static three-phase capacitor of r...
When switch is open, the reactance diagram is

xeq = j1 + j0.4 + j0.2 + j1 = j3.0 pu
Steady state power limit = 
= 0.4 pu
When switch is closed, the reactance diagram is

By converting star in to delta,


= 0.76 pu
Steady state power limit = 
= 1.58 pu
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Most Upvoted Answer
In the system shown in the figure, a static three-phase capacitor of r...
When switch is open, the reactance diagram is

xeq = j1 + j0.4 + j0.2 + j1 = j3.0 pu
Steady state power limit = 
= 0.4 pu
When switch is closed, the reactance diagram is

By converting star in to delta,


= 0.76 pu
Steady state power limit = 
= 1.58 pu
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Community Answer
In the system shown in the figure, a static three-phase capacitor of r...
When switch is open, the reactance diagram is

xeq = j1 + j0.4 + j0.2 + j1 = j3.0 pu
Steady state power limit = 
= 0.4 pu
When switch is closed, the reactance diagram is

By converting star in to delta,


= 0.76 pu
Steady state power limit = 
= 1.58 pu
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