Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN: 9781305632134
Author: J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher: Cengage Learning
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A 2-wire d.c. distributor, 500 m long is fed at one of its ends. The cross-sectional area of each conductor is 3·4 cm2 and the resistivity of copper is 1·7 μΩcm. The distributor supplies 200 A at a distance of 300m from the feeding point and 100 A at the terminus. Calculate the voltage at the feeding end if the voltage at the terminus is to be 230 V.
![TUTORIAL PROBLEMS
1. What should be the minimum cross-sectional area of each conductor in a two-core cable 100 m long to
limit the total voltage drop to 4% of the declared voltage of 250V when the conductors cary 60A ? The
resistivity of the conductor is 2-845 µ2 cm.
2. A2-wire d.c. distributor, 500 m long is fed at one of its ends. The cross-sectional area of each conductor
is 3-4 cm and the resistivity of copper is 1-7 µ2cm. The distributor supplies 200 A at a distance of
300m from the feeding point and 100 A at the terminus. Calculate the voltage at the feeding end if the
voltage at the terminus is to be 230 V.
3. A 2-wire d.c. distributor AB 500 metres long is fed from point A and is loaded as under :
[0:34 cm³]
[241 V]
Distance from feeding point A (in metres)
100
300
400
500
40
Load (amperes)
If the specific resistance of copper is 1-7× 10m, what must be the cross-section of each wire in order
that the voltage drop in the distributor shall not exceed 10 volts ?
4. A 2-wire d.c. distributor is 250 m long. It is to be loaded as shown in Fig 13.10 at 50 m intervals. If the
maximum voltage drop is not to exceed 10V and the resistivity of core material is 0-7 x 2-54 µSN cm
determine the maximum cross-sectional area of each conductor.
20
40
50
[1-734 cm*]
[1-602 cm³]
Supply
End
120 A
90 A
60 A
50 A
80 A
Fig. 13.10](https://content.bartleby.com/qna-images/question/da5427b9-c766-4674-83eb-19df1e8662b3/15f843d3-0626-4e43-b26b-5dc0422055cb/9u5r3md_processed.png)
Transcribed Image Text:TUTORIAL PROBLEMS
1. What should be the minimum cross-sectional area of each conductor in a two-core cable 100 m long to
limit the total voltage drop to 4% of the declared voltage of 250V when the conductors cary 60A ? The
resistivity of the conductor is 2-845 µ2 cm.
2. A2-wire d.c. distributor, 500 m long is fed at one of its ends. The cross-sectional area of each conductor
is 3-4 cm and the resistivity of copper is 1-7 µ2cm. The distributor supplies 200 A at a distance of
300m from the feeding point and 100 A at the terminus. Calculate the voltage at the feeding end if the
voltage at the terminus is to be 230 V.
3. A 2-wire d.c. distributor AB 500 metres long is fed from point A and is loaded as under :
[0:34 cm³]
[241 V]
Distance from feeding point A (in metres)
100
300
400
500
40
Load (amperes)
If the specific resistance of copper is 1-7× 10m, what must be the cross-section of each wire in order
that the voltage drop in the distributor shall not exceed 10 volts ?
4. A 2-wire d.c. distributor is 250 m long. It is to be loaded as shown in Fig 13.10 at 50 m intervals. If the
maximum voltage drop is not to exceed 10V and the resistivity of core material is 0-7 x 2-54 µSN cm
determine the maximum cross-sectional area of each conductor.
20
40
50
[1-734 cm*]
[1-602 cm³]
Supply
End
120 A
90 A
60 A
50 A
80 A
Fig. 13.10
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