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Solved Problems-20

Problems-20
A symmetrical 440V, 3-phase system supplies a star-connected load. The branch impedances are Description: 7021.png. Assuming the neutral of the supply to be earthed, calculate the voltage to earth of the star point. Assume the phase sequence RYB.
 
Solution
Here, line voltages are,
Description: 7000.png
 
∴ Phase voltages are
 
Description: 7031.png
 
Phase admittances are,
 
Description: 7037.png
 
By Millman’s theorem, the voltage of the load star point with respect to earth is,
 
Description: 7043.png 




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