A 33 KV substation is to be connected to a 11 KV stepdown substation which is at a distance of 1.5 km by c under- ground cable. If the size of the transformer in the stepdown substation is 500 KVA, determine the size of the cable.
A 33 KV substation is to be connected to a 11 KV stepdown substation which is at a distance of 1.5 km by c under- ground cable. If the size of the transformer in the stepdown substation is 500 KVA, determine the size of the cable.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Please refer the given table for cable sixe
Transcribed Image Text:Nominal area of
conductor in sq.
mm.
70
95
120
150
185
240
300
Nominal area
in sq. mm.
6
10
16
25
35
50
70
95
120
150
185
225
240
300
400
500
625
Maximum Continuous Current Rating
In Ground amps. In Duct amps
150
130
170
150
200
180
240
220
265
245
320
275
360
• 320
Number and
nominal
diameter of
wires in mm
1/2.80
1/3.55
7/1.70
7/2.24
7/2.50
19/1.80
19/2.24
19/2.50
37/2.06
37/2.24
37/2.50
37/2.80
37/3.00
61/2.50
61/3.00
91/2.65
91/3.00
Maximum allow.
able resistance
per km. at 20°C
for single core
cables in ohms
4.759
2.960
1.876
1.080
0.8675
0.6176
0.3988
0.3201
0.2423
0.2049
0.1645
0.1311
0.1142
0.09979
0.06930
0.05960
0.04645
In Air amps.
125
140
165
200
215
255
290
Maximum allowable
resistance per km. at
20°C for twin and multi-
core cables in ohms
4.851
3.018
1.912
1.102
0.8843
0.6299
0.4068
0.3263
0.2470
0.2088
0.1677
0.1337
0.1165
0.1070
0.07069
Transcribed Image Text:A 33 KV substation is to be connected to a 11 KV
stepdown substation which is at a distance of 1.5 km by c under-
ground cable. If the size of the transformer in the stepdown substation
is 500 KVA, determine the size of the cable.
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