The department recently purchased a new 3-phase lathe, and he is required to wire the power supply. The nameplate of the motor on the lathe indicated that it is delta connected with an equivalent impedance of (5+j15) 2 per phase. The workshop has a balanced star connected supply and you measured the voltage in phase A to be 230 Đ0⁰ V. (a) Discuss three (3) advantage of using a three phase supply as opposed to a single phase supply

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The department recently purchased a new 3-phase lathe, and he is required to wire the
power supply. The nameplate of the motor on the lathe indicated that it is delta connected with
an equivalent impedance of (5 +j15) 2 per phase. The workshop has a balanced star connected
supply and you measured the voltage in phase A to be 230 Ɖ0⁰ V.
(a) Discuss three (3) advantage of using a three phase supply as opposed to a single
phase supply
(b) Draw a diagram showing a star-connected source supplying a delta-connected load.
Show clearly labelled phase voltages, line voltages, phase currents and line currents.
(c) If this balanced, star-connected source is connected to the delta-connected load,
calculate:
i) The phase voltages of the load
ii) The phase currents in the load
iii) The line currents
iv) The total apparent power supplied
Transcribed Image Text:The department recently purchased a new 3-phase lathe, and he is required to wire the power supply. The nameplate of the motor on the lathe indicated that it is delta connected with an equivalent impedance of (5 +j15) 2 per phase. The workshop has a balanced star connected supply and you measured the voltage in phase A to be 230 Ɖ0⁰ V. (a) Discuss three (3) advantage of using a three phase supply as opposed to a single phase supply (b) Draw a diagram showing a star-connected source supplying a delta-connected load. Show clearly labelled phase voltages, line voltages, phase currents and line currents. (c) If this balanced, star-connected source is connected to the delta-connected load, calculate: i) The phase voltages of the load ii) The phase currents in the load iii) The line currents iv) The total apparent power supplied
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