Question

three 50 ohm resistors are connected in star across 400 v 3-phase supply find the phase current . if one of the resistor is disconnected , then​

Answer 1

Answer:

three 50 ohm resistors are connected in star across 400 v 3-phase supply find the phase current . if one of the resistor is disconnected , then the other will be connected

Explanation:

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Answer 2

Answer

The phase current when one resistor is disconnected is 4 A

Explanation:

Given,

         Line voltage VL = 400V

         Phase voltage V ph =  $\frac{VL}{\sqrt{3} }$  = $\frac{400}{\sqrt{3} }$  = 231V

         Phase Resistance R ph = 50Ω

         cosΦ = 1

1. The phase current when three 50Ω resistors are connected in star across 400V is ;-

• When one of the resistors is disconnected the remaining two resistors will behave as if they were connected in series across the line voltage. The circuit behaves as a single circuit.

=> Phase current (I ph) = Line current (I L)

=> I L = $\frac{V L}{R eff}$ A

         = $\frac{400}{50+50}$ A

         = 4A

So, the phase current of the circuit when one resistor is disconnected is 4A.