Final answer:
The question deals with creating a per-phase schematic for a balanced three-phase electrical system supplying a load. It requires representing the line impedance and calculating the load impedance using the power factor, line impedance, and system voltage provided.
Step-by-step explanation:
The student's question involves calculating the schematic for a balanced three-phase load in an electrical engineering scenario. Since the load is balanced, only one of the three phases needs to be represented in the schematic. The per-phase power is 112 kVA divided by √3, given the three-phase system, and the voltage per phase is 1 kV.
The power factor is given as 0.9 lagging, which indicates the angle by which the current lags the voltage. Using the power factor, we can calculate the real and reactive power per phase. The impedance provided is 0.8+j3.0Ω, which shows that there is both resistance (0.8Ω) and inductive reactance (3.0Ω) in the line.
For the schematic, represent the source voltage (1 kV) as an ideal AC voltage source. The line impedance can be shown with a series combination of a resistor and inductor, with the values given. The load can be shown as a generic branch element with an impedance that can be calculated using the per-phase power, voltage, and power factor.