how to calculate the KVAr for an motor for improving the PF

Question Posted / nellai sankar

3 Answers
18842 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

how to calculate the KVAr for an motor for improving the PF..

Answer / guest

Example:Calculation of the kVAR rating for 1750kW Motor

Motor Data:
Rating of Motor: 1750kW
System voltage: 6.6kV
Power factor of the motor when running at 75% of full
load : 0.84

(Power factor of the motor is considered at 75% of full
load, assuming that the motor will be loaded at an average
of 75%)

Target Power factor : 0.95 lag ( To improve the power
factor from 0.84 to 0.95, after adding the capacitor bank
in the motor circuit)

Required kVAR of the Capacitor Bank to
achieve the target power factor.

KVAr = KW ((TanQ1- TanQ2)

where
Q1= Cosinsverse(P.F1)Initial Power Factor Angle
Q2= Cosinsverse(P.F2)Target Power Factor Angle

So, required kVAR
=0.75*1750*(tan (cos-1 (0.84)) - tan (cos-1 (0.95)))

= 416kVAR

Is This Answer Correct ?

65 Yes

10 No

how to calculate the KVAr for an motor for improving the PF..

Answer / ashok chodankar

Same as calculated above

Is This Answer Correct ?

7 Yes

1 No

how to calculate the KVAr for an motor for improving the PF..

Answer / balamurugan.r

presen load and pf

Is This Answer Correct ?

5 Yes

2 No

Post New Answer

More Electrical Engineering Interview Questions

What is the difference between circuit and network.

15 Answers Jadavpur University, Sail, TCS,

What are the various types of BUSBAR Schemes? explain each

1 Answers NTPC,

State the frequency for rc phase shift oscillator?

0 Answers

What are the different methods for calculating Short Circuit Curren?

3 Answers

what are the types of control systems to control the speed of the motor??

1 Answers

What is reason of rating of transmission line multi pal of 11 like as 11/33/66/220 ? Why not use 75 kv 23 kv line in power system ?

1 Answers Apollo, Balco, Bhel, Vardhman,

why h parameter are called as hybrid parameter?

0 Answers

Does the dg syncronization sucessful in practical.

2 Answers

what is the diff between VCB & ABCB breaker in substaions? explain the operating priciples of VCB & ABCB

1 Answers

any one please tell taht what type questions will be asked in BHEL interview, i am having interview on 24th Dec, please send this to mail pradeepsistam@yahoo.co.in

0 Answers Bhel,

what is the Space heater? why using in Electrical motor?

3 Answers

difrence bitwin boost charge and float chargeing

1 Answers

For more Electrical Engineering Interview Questions Click Here