Find the most economical cross-section of a 3-core distributor cable 250 m long supplying a load of 80 kW at 400 V and 0.8pf lagging for 4000 hours per annum and open circuited for the remainder of the year. The cost of the cable including installation is (15a+25) per meter, where a 'is area of each conductor in cm². The interest and depreciation total 10 per cent and cost of energy wasted is 10% per unit. The resistance per km of conductor of 1 cm² cross-section is 0.173ohms.

Find the most economical cross-section of a 3-core distributor cable 250 m long supplying a load of 80 kW at 400 V and 0.8pf lagging for 4000 hours per annum and open circuited for the remainder of the year. The cost of the cable including installation is (15a+25) per meter, where a 'is area of each conductor in cm². The interest and depreciation total 10 per cent and cost of energy wasted is 10% per unit. The resistance per km of conductor of 1 cm² cross-section is 0.173ohms.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter4: Transmission Line Parameters

Section: Chapter Questions

Problem 4.1P: The Aluminum Electrical Conductor Handbook lists a dc resistance of 0.01558 ohm per 1000 ft at 20C...

See similar textbooks

Question

Find the most economical cross-section of a 3-core distributor cable 250 m long supplying a load of 80 kW
at 400 V and 0.8pf lagging for 4000 hours per annum and open circuited for the remainder of the year. The
cost of the cable including installation is (15a+25) per meter, where a 'is area of each conductor in cm².
The interest and depreciation total 10 per cent and cost of energy wasted is 10% per unit. The resistance per
km of conductor of 1 cm² cross-section is 0.173ohms.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step by step

Solved in 2 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Similar questions

H. W.: The cost of a 2-core feeder cable, including installation is (90 a + 20) per meter and the interest and depreciation charges are 10 per cent. The cable is 2 km in length and cost of energy is 4% per unit. The maximum current in the feeder is 250 A and the demand is such that the current copper loss is equivalent to what would be produced by the full flowing for 6 months. If the resistance of a conductor of 1 square cm and 1 km length is 0.173 Q, calculate the most economical cross-sectional area.
A 33 kV single core cable has a conductor diameter of 1 cm and a sheath of inside diameter 4 cm. Find the maximum and minimum stress in the insulation.
The diameter of an ACSR conductor is 1.1116 inches. The steel core has strands of diameters of 0.1291 inches each. If 54 Aluminum strands have the diameters of 0.1351 inches each, the number of Steel strands is: O A. 15 O B. None of choices are correct O C. 19 O D.7 O E. 27
i) Calculate V1 and V2 for the voltage across the string insulator having phase voltage of 33kV for transmission line using details tabulated in the Table 3(a). Table 3(a) Type of Insulator Shunt Capacitance between each unit 0.1 C String to junction Self -Capacitance of each insulator ii) With the help of a suitable schematic diagram and necessary theoretical explanation, illustrate how to improve the efficiency of the suspension insulator.
A single-core cable working on 66 kV has a conductor diameter of 2 cm and the sheath of inside diameter is 10 cm. If two metallic intersheaths of diameters 5 cm, 8 cm respectively are used for grading the cable.. If the maximum electric stress is the same for each layers. 1- Find the voltage of each metallic intersheaths. 2- Find the thickness of each layers.
A singl core cable of voltage 30 kv. The diameter of Conductor is 3 cm. The diameter of cable is 25 cm. This cable has Two layer of insulator having arelative permittivity 5-3 respectively of The ratio of maximum electric stress of maximum electric stress 8 First layer to the of second layer is 10 Find & 1- The thickness of each layers. 3- The voltage of each layers. §. Layers The saving in radius of cable if another ungrading cable has the Same maximum electric stress, Total village, Conductor diameter of grading cable.
A 2-wire d.c. distributor cable AB is 2 km long and supplies loads of 100A, 150A,200A and 50A situated 500 m, 1000 m, 1600 m and 2000 m from the feeding point A. Each conductor has a resistance of 0.01 per 1000 m. Calculate the p.d. at each load point if a p.d. of 300 V is maintained at point A.
Solve showing all the steps in detail
A 2-wire d.c. distributor cable AB is 2 km long and supplies loads of 100A, 150A,200A and 50A situated 500 m, 1000 m, 1600 m and 2000 m from the feeding point A. Each conductor has a resistance of 0-010 per 1000 m. the p.d. at each load point if a p.d. of 300 V is maintained at point A is: * O no one of the answers (a, b & c) VA=300V; VC=289V; VD=285V; VE=281V; VB=793V VA=300V; VC=270V; VD=265V; VE=260V; VB=255V VA=300V; VC=295V; VD=291V; VE=288V; VB=287.6V
9. What size THWN copper conductors are required to supply a 120/208V, three-phase panelboard with 20.5KVA of noncontinuous load and 25KVA of continuous load? a. 250 kcmil b. No. 1 C. 1/0 d. 4/0