The distribution network shown in Figure below is to supply two factories A & B with load curves indicated in Fig. Assume that both factories have a lagging power factor of 0.8. a) Select the required sizes of transformers for substation supplying both factories such that in the case of a failure in one transformer the overload on the remaining ones should not exceed 12%.
The distribution network shown in Figure below is to supply two factories A & B with load curves indicated in Fig. Assume that both factories have a lagging power factor of 0.8. a) Select the required sizes of transformers for substation supplying both factories such that in the case of a failure in one transformer the overload on the remaining ones should not exceed 12%.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Sub:electrical distribution
Transcribed Image Text:The distribution network shown in Figure below is to supply two factories
A & B with load curves indicated in Fig. Assume that both factories have
a lagging power factor of 0.8.
a) Select the required sizes of transformers for substation supplying
both factories such that in the case of a failure in one transformer
the overload on the remaining ones should not exceed 12%.
b)Calculate the annual energy losses in the transformers. Assuming
that transformers are in operation continuously
c) Select the required sizes of fuses to be installed at both sides of
transformers.
d)Select the required size of the 11 kV, XLPE cable for section S1, if
the cable is to be laid direct in ground with a maximum ground
temperature of 30° C.
e) Calculate the maximum expected voltage drop in section S1.
1
400V
11KV, XLPE Cable
Multi-Core Copper
S
4 Km
S (KVA)
S (KVA)
400
400
300
300-
200
200
100
100
Time (hr)
Time (hr)
24
6.
12
18
6.
12
18
24
Load curve of Factory (A)
Load curve of Factory (B)
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