14. A three-phase motòr load current of 164 amperes. The nameplate indicates that the heaters are to be sized for 115% of motor full load current. Current transformers with a ratio of 200:5 are used to reduce the current supplied to the overload heaters. Using the chart in Figure 4-7A,
14. A three-phase motòr load current of 164 amperes. The nameplate indicates that the heaters are to be sized for 115% of motor full load current. Current transformers with a ratio of 200:5 are used to reduce the current supplied to the overload heaters. Using the chart in Figure 4-7A,
Introductory Circuit Analysis (13th Edition)
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Transcribed Image Text:14. A three-phase motor nameplate indicates a full
load current of 164 amperes. The nameplate
indicates that the heaters are to be sized
for 115% of motor full load current. Current
transformers with a ratio of 200:5 are used to
reduce the current supplied to the overload
heaters. Using the chart in Figure 4-7A,
determine the size of overload heaters needed to
protect this motor.
Transcribed Image Text:HEATER
CODE
MOTOR FULL LOAD
CURRENT
LARGER HEATER.
MOTOR FULL LOAD
CURRENT
HEATER
CODE
MOTOR FULL LOAD
CURRENT
HEATER
CODE
6.5-7.1
XX35
1.35-1.47
XX01
0.25-0.27
XX18
7.2-7.8
XX36
1.48-1.62
XX02
0.28-0.31
XX19
7.9-8.5
XX37
XX03
0.32-0.34
XX20
1.63-1.78
8.6-9.4
XX38
XX04
0.35-0.38
XX21
1.79-1.95
9.5-10.3
XX39
XX05
0.39-0.42
XX22
1.96-2.15
XX40
10.4–11.3
XX06
0.43-0.46
XX23
2.16-2.35
XX41
11.4-12.4
XX07
0.47-0.50
XX24
2.36-2.58
XX08
0.51-0.55
2.59-2.83
XX42
12.5–13.5
XX25
XX09
0.56-0.62
XX2S
2.84-3.11
XX43
13.6-14.9
XX10
0.63-0.68
XX27
3.12-3.42
XX44
15.0-16.3
XX11
0.69-0.75
XX28
3.43-3.73
XX45
16.4–18.0
XX12
0.76-0.83
XX29
3.74-4.07
XX46
18.1-19.8
XX13
0.84-0.91
XX30
4.08-4.39
XX47
19.9-21.7
XX14
0.92-1.00
XX31
4.40-4.87
XX48
21.8-23.9
XX15
1.01-1.11
XX32
4.88-5.3
XX49
24.0-26.2
XX16
1.12-1.22
XX33
5.4-5.9
XX17
1.23-1.34
XX34
6.0-6.4
Figure 4-7A Typical overload heater chart.
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