1. Repeat Example 4.2, parts (a) and (b), assuming a three-phase 34.5 kV wye-grounded feeder main that has 350 kcmil 19-strand copper conductors with an equivalent spacing of 37 in between phase conductors and a lagging-load power factor of 0.9. K=3.5935 ×10-5 [%VD/KVA-mi]Below attached image is for example 4.2 from Table A-1 for 50°C and 60 HzExample 4-2 Assume that the feeder shown in Fig. 4-22 has the same charac-from Table A-10 for 60 Hz and 37-inch spacingSOLUTION(r cos 0 + x sin 0)G x 1000)V,V.(a) From Eq. (4-77),pu vNL = , + x, = 0.7456 2/miX, = 0.609 Q miX = 0.1366 /micos 0 = 0.9, laggingV = V, = 2400 V, line-to-neutral voltagewhere r = 1.503 /mifrom Table A-1 for 60 HzTherefore the per unit voltage drop per kilovoltampere-mile i(1.503 x 0.9 + 0.7456 x 0.4359)G x 1000240022 0.0001 VD/(k VA mi)orK= 0.01 % VD/(k VA mi)(b) From Fig. 4-17, the K constant for #4 copper conductors isK = 0.01 % VD/(kVA mi)which is the same as the one found in part a.teristics as the one in Example 4-1 and a lumped-sum load of 500 kVA wi.lagging-load power factor of 0.9 is connected at the end of a l-mi-long feedmain. Calculate the percent voltage drop in the main.SOLUTION The percent voltage drop in the main is% VD = x K x S,= 1.0 mi x 0.01% VD/(kVA · mi) x 500 kVA= 5.0%S= = 1 mi# 4 copperD = 37AVLL = 4.16 kV500 kVAPF = 0.9 lagFigure 4-22

PArt a and part b of Example 4.2 is repeated for the following data as shown below

1. Repeat Example 4.2, parts (a) and (b), assuming a three-phase 34.5 kV wye-grounded feeder main that has 350 kcmil 19-strand copper conductors with an equivalent spacing of 37 in between phase conductors and a lagging-load power factor of 0.9. K=3.5935 ×10-5 [%VD/KVA-mi] Below attached image is for example 4.2

1. Repeat Example 4.2, parts (a) and (b), assuming a three-phase 34.5 kV wye-grounded feeder main that has 350 kcmil 19-strand copper conductors with an equivalent spacing of 37 in between phase conductors and a lagging-load power factor of 0.9. K=3.5935 ×10-5 [%VD/KVA-mi] Below attached image is for example 4.2

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter21: Resistive-capacitive Series Circuits

Section: Chapter Questions

Problem 6RQ: A 15-F AC capacitor is connected in series with a 50 resistor. The capacitor has a voltage rating...

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