QI. Power and Power Factor Correction A factory has the following five major loads: Load 1: A motor rated at 4 Hp,0.85 pf lagging ( 1 hp = 0.7457kW) Load 2: A heater rated 3 kW at unity power factor Load 3: A synchronous motor rated at 3kVar, 0.85 pf leading Load 4: Thirtyty - 100-W lightbulbs Load 5: A motor rated 2.5 Hp at 0.85 pf leading a) Calculate the total real, reactive and apparent power. b) Find the overall power factor. c) the Kvar rating and capacitance required to improve the power factor to unity. d.) the current drawn from the supply under the new power factor conditions.

QI. Power and Power Factor Correction A factory has the following five major loads: Load 1: A motor rated at 4 Hp,0.85 pf lagging ( 1 hp = 0.7457kW) Load 2: A heater rated 3 kW at unity power factor Load 3: A synchronous motor rated at 3kVar, 0.85 pf leading Load 4: Thirtyty - 100-W lightbulbs Load 5: A motor rated 2.5 Hp at 0.85 pf leading a) Calculate the total real, reactive and apparent power. b) Find the overall power factor. c) the Kvar rating and capacitance required to improve the power factor to unity. d.) the current drawn from the supply under the new power factor conditions.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter26: Three-phase Circuits

Section: Chapter Questions

Problem 3PA: You are an electrician working in an industrial plant. A 30-hp three-phase induction motor has a...

See similar textbooks

Similar questions

Q/Fore the d.c series motor loaded by d.c. generator, when the load resistance is high then the speed of the motor Ans/ low high Remain constant None of the mentioned
ings of a 40 kVA, 6 m respectively. The le- ate (i) the primary vol ced (ii) the full-load re
Q-18a.
10 kW, 230 V, d.c shunt generator is operating at rated condition with 80% efficiency. Input power and the total loss are respectively
A power station has the following daily load cycle: Time (Hours) 0-6 6-10 10 - 12 12 – 16 | 16– 20 20 – 24 Load (MW) 40 50 60 50 70 40 Draw the load curve and find (i) Base Load (ii) Peak Load (iii Peak Time (iv) Off-Peak Time and (v) Load
What will be the value of the twiddle factor: W42
18 The incremental cost characteristics of two generators delivering 200 MW are as follows: dF dP2 dF = 2.0+0.01 P, dP, = 1.6+0.02P2 %3D For economic operation the generation P, and P2 should be (a) 100 MW and 100 MW (b) 80 MW and 120 MW (c) 200 MW and 100 MW (d) 120 MW and 80 MW
Which of the following is true for the power factor in a circuit with high magnetizing current flow?
A 3-phase squirrel cage induction motor draws 10 kW from mains when loaded at a slip of 0.05. The stator losses and mechanical losses are 1 kW and 550 W respectively. Its efficiency is
45. A 3-phase, 5 kW induction motor has a p.f. of 0-75 lagging. A bank of capacitors is connected in delta across the supply termi- nals and p.f. raised to 0-9 lagging. The KVAR rating of capacitors connected in each phase is (i) 1.672 kVAR (ii) 0-578 kVAR (iii) 0-663 kVAR (iv) 3-728 kVAR
The conversion of an AC to DC Source is by using the A) Commulator B) None of these C Round ring D) Slip ring
You are an electrician working in an industrial plant. A 30-hp three-phase induction motor has a current draw of 36 amperes at full load. The motor is connected to a 480-volt line. A three-phase wattmeter indicates a true power of 22 kW. Determine the power factor of the motor and the amount of capacitance needed to correct the power factor to 95. Also determine the minimum voltage rating of the capacitors. The capacitors are to be connected in wye.