(b) An unbalanced three-phase, delta connected load is connected to a three-phase star connected supply of 240 Vrms per phase. The phase sequence is positive. The loads is given as below: Taking VRY as reference. (i) (iii) ZRY=30/0° ZYB40236.87° ZBR=452-10° 2 Sketch and completely label the full circuit. Determine the line currents. Determine total apparent power (S), active power (P) and reactive power (Q) delivered by the source.

Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter3: Power Transformers
Section: Chapter Questions
Problem 3.25P: Consider a single-phase electric system shown in Figure 3.33. Transformers are rated as follows:...
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(b) An unbalanced three-phase, delta connected load is connected to a three-phase
star connected supply of 240 Vrms per phase. The phase sequence is positive.
The loads is given as below:
Taking VRY as reference.
(i)
(ii)
(iii)
(iv)
(v)
ZRY=3040° 2
ZYB=40236.87° 2
ZBR=452-10°
Sketch and completely label the full circuit.
Determine the line currents.
Determine total apparent power (S), active power (P) and reactive
power (Q) delivered by the source.
Two wattmeters are used to measure the total active power received
by the loads. Draw the connection of the two wattmeters if their
current coils are in line R and B respectively.
What is the total power measured by the two wattmeters? Compare
your answer with Q.1 (b) (iii).
(vi) Why not use three wattmeters connection?
Transcribed Image Text:(b) An unbalanced three-phase, delta connected load is connected to a three-phase star connected supply of 240 Vrms per phase. The phase sequence is positive. The loads is given as below: Taking VRY as reference. (i) (ii) (iii) (iv) (v) ZRY=3040° 2 ZYB=40236.87° 2 ZBR=452-10° Sketch and completely label the full circuit. Determine the line currents. Determine total apparent power (S), active power (P) and reactive power (Q) delivered by the source. Two wattmeters are used to measure the total active power received by the loads. Draw the connection of the two wattmeters if their current coils are in line R and B respectively. What is the total power measured by the two wattmeters? Compare your answer with Q.1 (b) (iii). (vi) Why not use three wattmeters connection?
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