14. A three-phase motor nameplate indicates a fullload current of 164 amperes. The nameplateindicates that the heaters are to be sizedfor 115% of motor full load current. Currenttransformers with a ratio of 200:5 are used toreduce the current supplied to the overloadheaters. Using the chart in Figure 4-7A,determine the size of overload heaters needed toprotect this motor. HEATERCODEMOTOR FULL LOADCURRENTLARGER HEATER.MOTOR FULL LOADCURRENTHEATERCODEMOTOR FULL LOADCURRENTHEATERCODE6.5-7.1XX351.35-1.47XX010.25-0.27XX187.2-7.8XX361.48-1.62XX020.28-0.31XX197.9-8.5XX37XX030.32-0.34XX201.63-1.788.6-9.4XX38XX040.35-0.38XX211.79-1.959.5-10.3XX39XX050.39-0.42XX221.96-2.15XX4010.4–11.3XX060.43-0.46XX232.16-2.35XX4111.4-12.4XX070.47-0.50XX242.36-2.58XX080.51-0.552.59-2.83XX4212.5–13.5XX25XX090.56-0.62XX2S2.84-3.11XX4313.6-14.9XX100.63-0.68XX273.12-3.42XX4415.0-16.3XX110.69-0.75XX283.43-3.73XX4516.4–18.0XX120.76-0.83XX293.74-4.07XX4618.1-19.8XX130.84-0.91XX304.08-4.39XX4719.9-21.7XX140.92-1.00XX314.40-4.87XX4821.8-23.9XX151.01-1.11XX324.88-5.3XX4924.0-26.2XX161.12-1.22XX335.4-5.9XX171.23-1.34XX346.0-6.4Figure 4-7A Typical overload heater chart.

Given : Name plate current, I=164A Heater to be sized at, x=115% Transformer ratio, k=200:5

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)

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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Concept explainers

Gear Motor

A gear motor is a combination of a gearbox and an electric motor. This combination of two systems is used for efficient usage of the motor. It makes a cost-effective solution for high torque, low-speed applications. These motors are used in our household as, garage door openers, alarm clocks. In commercial areas, hospital beds, cranes.

Question

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.

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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