A balanced wye-connected three-phase source has line-to-neutral voltages of 450

Question

A balanced wye-connected three-phase source has line-to-neutral voltages of 450 V rms. Find the rms line-to-line voltage magnitude. Express your answer to three significant figures and include the appropriate units. V_L = If this source is applied to a wye-connected load composed of three 29 ohm resistances, find the rms line-current magnitude. Express your answer to three significant figures and include the appropriate units. I_L = If this source is applied to a wye-connected load composed of three 29 ohm resistances, find the total power delivered. Express your answer to three significant figures and include the appropriate units. P =

Explanation / Answer

PART A:

RMS line to line voltage= 1.73*450 = 778.5 volt

PART B:

RMS Line current = RMS phase current

= 450/29

=15.52 A

PART C:

Total power delievered = 3*Vp*Ip

= 3*450*(450/29)

=20.948 kW

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