Determine the most economical size of a 3-phase line which supplies the following loads at 10 kV : (1) 100 kW at 0-8 p.f. (lag) for 10 hours (ii) 500 kW at 0-9 p.f. (lag) for 8 hours (ii) 100 kW at unity p.f. for 6 hours. The above gives the daily load cycle. The cost per km of the completely erected line is Rs (8000 a 1500) where a is the area of cross-section of each conductor. The combined interest and depreciation per annum of capital cost. Cost of energy losses is 5 paise per kWh. Resistivity of conducto 10%

Determine the most economical size of a 3-phase line which supplies the following loads at 10 kV : (1) 100 kW at 0-8 p.f. (lag) for 10 hours (ii) 500 kW at 0-9 p.f. (lag) for 8 hours (ii) 100 kW at unity p.f. for 6 hours. The above gives the daily load cycle. The cost per km of the completely erected line is Rs (8000 a 1500) where a is the area of cross-section of each conductor. The combined interest and depreciation per annum of capital cost. Cost of energy losses is 5 paise per kWh. Resistivity of conducto 10%

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...

See similar textbooks

Similar questions

Answer the first and last 2 qestion Step By Step
In single phase AC distribution system, the net drop is the difference of the drop in resistance due to the inphase component and in reactance due to quadrature component of current Select one: True False
Referring to the circuit shown in Figure 1 below, solve the following problems: - i) Calculate the total impedance, ZT. ii) Determine the total current, Ir supplied by the generator iii) Determine the value of current at load impedance, I1, I2 and I3. iv) Calculate total real power, PT and reactive power, Qr supplied by the generator. v) Draw a power triangle of this circuit vi) Calculate the power factor of this circuit.
The steady-state voltage drop between the load and the sending end of the line seen in (Figure 1) is excessive Suppose that V-4950/0° V (rms). A capacitor is placed in parallel with the 192 kVA load and is adjusted until the steady-state voltage at the sending end of the line has the same magnitude as the voltage at the load end, that is, 4950 V (rms). The 192 kVA load is operating at a power factor of 0.8 lag. Part A Calculate the size of the capacitor in microfarads if the circuit is operating at 60 Hz. In selecting the capacitance, use the value that results in the lowest possible power loss in the line. Express your answer in microfarads to three significant figures. ▸ View Available Hint(s) Figure 1 of 1 202 1100 192 kVA 0.8 lag ΜΕ ΑΣΦ. 11 vec C= 22.8 Submit Previous Answers Incorrect; Try Again; 5 attempts remaining Provide Feedback ? F
3 Two units of generation maintain 132 kV and 120 kV (line) at the ends of an interconnector of inductive reactance per phase of 40V and with negligible resistance and shunt capacitance. A load of 22 MW is to be transferred from the 132 kV unit to the other end. Calculate the necessary conditions between the two ends, including the power factor of the current transmitted.
Question 1) A 154 kV transmission line has a length of 100 km. The line and the conductors are given in Figure 1. The line is operated at f= 50 Hz. For both old and new lines calculate; a. GMD and GMR. b. Inductance of the line in Henries (H). c. Series Impedance (Z) of the line in Ohms. d. *Compare the results for both lines and comment on the results. e. *If the distance between the two neighbouring conductors is increase from 13 meters to 15 meters what would be the parameters in part a.,b. and c. comment on the results. New Line's Conductors 13 m 13 m Old Line's Conductors d r = 2 cm d = 40 cm r = 2 cm Figure 1
Q2: The constants of a 275 KV transmission line are A = 0.8525° and B = 200275° 0/phase. Draw the circle diagram to determine the power and power angle at unity power factor that can be received if the voltage profile at each end is to be maintained at 275 KV. What type a rating of compensating equipment will be required if the load is 150 MW at unity power factor with same voltage profile. (5.5 mark)
For the system shown in figure, voltages V2, V3 and angles 82, 83 are calculated using Newton-Raphson method. shunt line charging admittances are neglected. All the values are given in per unit on 100MVA base. Calculate the complex power flows S12 and S32 in actual units. 1) Z12 = 0.01+ j0.02 Z3 = 0.02+ j0.04 PL G QL Slack bus V2 = 0.96L -1.67° V3 = 0.884 - 5.48° Vi=1.0/0° (estimated time to answer this question: 13 minutes)
في دائرة 12 و i1 أحسب تیارات الشبكة /Q2 الشکل 9Ω ww ww 12 Ω 12 V E 8 V ww 4Ω ww 3Ω اضف ملف ww
Answer the first and last 2 qestion Step By Step
Q1. Transmission and distribution lines are important components of any power system study. (A) In relation to high voltage overhead ac transmission lines, Discuss the choice of materials for the conductors in terms of their electrical/mechanical properties and the costs involved. Discuss the factors that determine the distance (D) between phase conductors and explain the impact of the distance D on the inductance and capacitance values of the line at different voltage levels. Support your arguments with relevant equations where appropriate. Discuss the impact of the radius of the conductors on phase capacitance and inductance values and why bundles are used at very high voltages.