Question

A 3-phose 480-Volt circuit has a positive-sequence Y-connected source and supplies a delta-connected load. The impedance of the lines between the source and load is negligible. The angle of V2 is O and the phase impedance of the loed is 20−j8 Chms.

a) Draw the circuit. Label the value of the phose voltoges at the source. Label nodes A,B, and c Lobel the line currents Is,Iu, and Ie, Label the L-L voltages at the load: VAa ,VN, and Ve at Lobel the phase currents at the lood: Ik, Ik, and Ia.
b) Determine the phasor values of the L-L voltages at the lead. Drew the closed voltage phasor diagram for the system, showing all L-L and L-N voltages.
c) Determine the phesor value of the line currents.
d) Determine the phasor value of the phase currents in the source and the lood. e) Celculate the camplex power S that is corsumed by the lood and draw the pewer triengle. f) What is the power factor of the lood?

Answer 1

For the given circuit, a 3-phase 480-Volt positive-sequence Y-connected source supplies a delta-connected load with negligible line impedance. You need to draw the circuit, determine phasor values, calculate complex power, and determine the power factor of the load.

Step-by-step explanation:

For the given circuit, a 3-phase 480-Volt positive-sequence Y-connected source supplies a delta-connected load with negligible line impedance. The phase impedance of the load is 20-j8 ohms. To answer the question:

a) Draw the circuit as per the given diagram, label the values of phase voltages, line currents, L-L voltages, and phase currents at the load.

b) Determine the phasor values of the L-L voltages at the load and draw the closed voltage phasor diagram for the system.

c) Determine the phasor value of the line currents.

d) Determine the phasor value of the phase currents in the source and the load.

e) Calculate the complex power S consumed by the load and draw the power triangle.

f) Determine the power factor of the load.