most st algus 1. A three-phase load draws 720 kW from the grid with 0.8 lagging power factor. The load is balanced and star connected. For reactive power compensation, a bank of capacitors is connected in star across the load terminals. With this compensation, active power loss across the lines is reduced 10% (Meaning that If the power loss is 1 unit before compensation, power loss is 0.9 unit after compensation). Assuming that compensation does not change the load terminal voltage, calculate a) b) c) The kVAr rating of capacitors in each phase The improved power factor The new power factor if the same bank of capacitors is connected in delta Hint: The power loss across the line is proportional to the line current and hence the apparent

most st algus 1. A three-phase load draws 720 kW from the grid with 0.8 lagging power factor. The load is balanced and star connected. For reactive power compensation, a bank of capacitors is connected in star across the load terminals. With this compensation, active power loss across the lines is reduced 10% (Meaning that If the power loss is 1 unit before compensation, power loss is 0.9 unit after compensation). Assuming that compensation does not change the load terminal voltage, calculate a) b) c) The kVAr rating of capacitors in each phase The improved power factor The new power factor if the same bank of capacitors is connected in delta Hint: The power loss across the line is proportional to the line current and hence the apparent

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Single Phase AC Circuit

Alternating Current (AC) is a type of electric power in which the electric current changes, both in magnitude and direction, at regular intervals. This AC Circuits can deliver power in either a Single Phase system or a Three Phase system.

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Step 1: Given data:-

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Step 2: Calculating the reactive power:-

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Step 3: Calculating the reactive power after compensation:-

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Step 5: Part (b):-

Step 6: Part (c):-

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7.
If the load is connected to the generator thgrough an inductive line and the voltage at the load side is the same as the voltage at the terminals of the generator, which of the following must be true? O A. The reactive power is flowing from the generator to the load and from load to the generator at the same time. O B. The load is disconnected, and no power is delivered to the load. O C. The load has a poor power factor and it's absorbing too much reactive power. O D. None of the other choices are correct O E. The generator is unable to produce reactive power; therefore, the reactive power is flowing from the load to the generator.
A synchronous generator is rated 645 MVA, 24 kV, 0.9 pf lagging. It has a synchronous reactance 1.2 . The generator is feeding full load at 0.9 pf lagging at rated voltage. Calculate: (a) Excitation emf (E,) and power angle 8 (b) Reactive power drawn by the load Carry out calculations in pu form and convert the result to actual values.
There are only two generators in a power system, and these generators supply a total load of 10 MW. The no-load frequencies and droop constants for the generators are 51 Hz, 0.5Hz/MW, and 52 Hz, 1Hz/MW, respectively. What is the frequency of the combined system? What are the powers produced by individual generators? At this loading condi- tion, if the generator 1 is delivered to producc equal amount of power as the generator 2, what should be the no-load frequency of the generator 1?
If the load draws a current of 2727 A, in phase, from a generator, which of the following statement is true? O A. The reactive power is flowing from generator to the load and the real power is flowing from the load to the generator. O B. Since the current is in phase with the generator voltage, both the real and reactive power is flowing from the generator to the load. O .Since the current is leading the generator, both the real and reactive power is flowing from the load to the generator. O D. The real power is flowing from generator to the load and the reactive power is flowing from the load to the generator. O E. None of the other choices are correct
Two parallel loads are connected to a 120 volt rms, 60 Hz power line. One load absorbs 10 k watts at 0.8 power factor lagging. The second load absorbs 4 k watts at 0.9 power factor leading. Determine the real (watts) and reactive (VARS) power of the combined load.
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In the system shown in Figure 1, the transformers are connected star-star with both star points grounded and the generator is connected in star with its star points grounded. The per unit impedances of each element on a 40 MVA base are given in Table 1 and the voltage levels are given in Table 2. Z [p.u.] 0 2 tööt Generator 0.01 +j0.08 p.u. L Figure 1: A section of the distribution system Transformer T1 Line V BASE [KV] 0.04 + j 0.03 + j 0.15000000000000002 0.06000000000000000 Generator Table 1: Sequence impedances (p.u. on 40 MVA base) 3 T2 181. Line 3 10 Table 2: Voltage bases (kV) Load 1 Transformer T2 Load Current A load current of 11.316 kA is flowing with a lagging power factor of 90 %. Convert this to a current vector in per-unit. IL = 0.04 + j 0.06000000000000000