Three Phase Circuits Tuesday, September 13 th, 2005.

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Presentation transcript:

Three Phase Circuits Tuesday, September 13 th, 2005

Today Single-Phase Three-Wire Systems Three-Phase Wye-Wye Systems Delta Connection Wye-Delta Transformations

Single Phase Three-Wire Systems

+ or

Example Find I 1, I 2 and I nN !

The determinant is Solving by matrix inversion

Three-Phase Wye-Wye Systems Positive or abc sequence Negative or acb sequence



Delta Connection

Wye-Delta Transformations

Find the currents I aA, I bB, and I nN in this symetric single phase three wire systems. Sketch in phasor diagram !

In the Wye-Delta system shown, the source is positive sequence with Van = 100  0 Vrms and the phase impedance is Zp = 3 – j4 . Find the line voltage VL, the line current IL and the power delivered to the load !