A balanced load with ZR = ZB = ZY = ……<00 Ω was supplied a three phase 50 Hz, 100 V between line (balanced source). A fault on phase ‘B’ causes an open circuit, which unbalanced the load as shown in Figure 4. Similarly, a fault on the load of phase ‘Y’ cause a short-circuit, which unbalanced the load as shown in Figure 5. Using complex notation determine and analyse the individual phase currents and the neutral current in both figure.

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
Chapter8: Symmetrical Components
Section: Chapter Questions
Problem 8.15P
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  1. A balanced load with ZR = ZB = ZY = ……<00 Ω was supplied a three phase 50 Hz, 100 V between line (balanced source). A fault on phase ‘B’ causes an open circuit, which unbalanced the load as shown in Figure 4. Similarly, a fault on the load of phase ‘Y’ cause a short-circuit, which unbalanced the load as shown in Figure 5. Using complex notation determine and analyse the individual phase currents and the neutral current in both figure.
R
20
B
Y
R
20
400V, 60Hz
B
IR
ZB = 55 < 0° 0
Figure 4: Star Unbalanced Load
IR
ZR
IB
ZY
ZR = 30 < 0° 0
Fault
Zy17 <0°02
A balanced load with ZR = ZB = Zy = ......<00 Q was supplied a three phase 50 Hz, 100 V
between line (balanced source). A fault on phase 'B' causes an open circuit, which unbalanced
the load as shown in Figure 4. Similarly, a fault on the load of phase 'Y' cause a short-circuit,
which unbalanced the load as shown in Figure 5. Using complex notation determine and
analyse the individual phase currents and the neutral current in both figure.
Transcribed Image Text:R 20 B Y R 20 400V, 60Hz B IR ZB = 55 < 0° 0 Figure 4: Star Unbalanced Load IR ZR IB ZY ZR = 30 < 0° 0 Fault Zy17 <0°02 A balanced load with ZR = ZB = Zy = ......<00 Q was supplied a three phase 50 Hz, 100 V between line (balanced source). A fault on phase 'B' causes an open circuit, which unbalanced the load as shown in Figure 4. Similarly, a fault on the load of phase 'Y' cause a short-circuit, which unbalanced the load as shown in Figure 5. Using complex notation determine and analyse the individual phase currents and the neutral current in both figure.
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