The sum of all phase current in a star connected primary winding with no neutral connection is equal to___________?
Correct answer: D. Zero at all times
- A. Phase current
- B. Three times the phase current
- C. Three times the line current
- D. Zero at all times
Explanation
With no neutral connection, the star point has no path for current to enter or leave, so Kirchhoff’s current law requires the instantaneous sum of the three phase currents to be zero. This remains true even if the currents are not balanced.
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