Three Phase Circuits Ppt. Considering a phase as the reference for a. 11 3 analysis of the y y circuit.
1 chapter 11 balanced three phase circuits 11 1 2 three phase systems. The line to line voltages are. Three phase circuits delta source vab vab 0 vbc vab 120 vca vab 240 wye wye system delta delta system delta wye system theorem for a balanced three phase circuit the instantaneous power is constant instantaneous power subtract the first two then add to the third to get ra replace in the third and solve for r1 power.
Instantaneous power in three phase circuits in a balanced three phase circuit the total instantaneous power is invariant with time.
11 4 analysis of the y circuit. A three phase ac system consists of three phase generators transmission lines and loads. Two wattmeter method to measure 3 phase power the reading of wattmeter w1 is given by p1 vab ia cos φ 30 v i cos 30 φ 1 where v and i are the line voltage and current respectively. Three phase circuits delta source vab vab 0 vbc vab 120 vca vab 240 wye wye system delta delta system delta wye system theorem for a balanced three phase circuit the instantaneous power is constant instantaneous power subtract the first two then add to the third to get ra replace in the third and solve for r1 power.
