A 100 MVA, 345 kV balanced Y connected three phase source is supplying a Y conne

Question

A 100 MVA, 345 kV balanced Y connected three phase source is supplying a Y connected 80 MVA load at 0.8 lagging power factor.

The system is shown in Figure Q6 (a).

a) Find the phase voltages Ea,Eb,Ec and load impedances at each phase Za,Zb,Zc (=Z)

b) Also calculate the active and reactive power dissipated in each impedance Za,Zb,Zc (=Z)

c) Two Watt meters are now connected between the lines of the three phase system as shown in Figure Q6 (b).

Find the readings of the two Watt meters.

d) Use your results in (b) and (c) above to prove/verify "Two Watt Meter Method" for

three phase power measurements

                                                                6(a)

                                                               6(b)

A 100 MVA, 345 kV balanced Y connected three phase source is supplying a Y connected 80 MVA load at 0.8 lagging power factor. The system is shown in Figure Q6 (a). Find the phase voltages Ea,Eb,Ec and load impedances at each phase Za,Zb,Zc (=Z) Also calculate the active and reactive power dissipated in each impedance Za,Zb,Zc (=Z) Two Watt meters are now connected between the lines of the three phase system as shown in Figure Q6 (b). Find the readings of the two Watt meters. Use your results in (b) and (c) above to prove/verify "Two Watt Meter Method" for three phase power measurements

Explanation / Answer

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