Delta and Wye 3-phase circuit problem set
Question 1:
Label where each of the following electrical quantities would be found in both the "Y" and "Delta" three-phase configurations:
- •
- Phase voltage
- •
- Line voltage
- •
- Phase current
- •
- Line current
In which circuit (Y or Delta) are the phase and line currents equal?
In which circuit (Y or Delta) are the phase and line voltages equal? Explain both answers, in terms that anyone with a basic knowledge of electricity could understand.
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Question 2:
Explain the difference between a balanced polyphase system and an unbalanced polyphase system. What conditions typically cause a polyphase system to become unbalanced?
A "balanced" polyphase system is one where all line voltages are equal to each other, and all line currents are also equal to each other. Ünbalanced" conditions usually stem from unsymmetrical loads, although severe imbalances may be caused by faults in the system.
Question 3:
In a balanced Y-connected power system, calculate the phase voltage (Ephase) if the line voltage (Eline) is 480 volts.
Question 4:
Calculate all voltages, currents, and total power in this balanced Delta-Delta system
- Eline =
- Iline =
- Ephase(source) =
- Iphase(source) =
- Ephase(load) =
- Iphase(load) =
- Ptotal =
answer
