How to calculate the average power factor in 3 phase
unbalanced system
Answers were Sorted based on User's Feedback
Answer / thakur
Simply calculate total KWH and KVH of last 24 Hrs and
Divide into-Total KWH/Total KVH=Avg PF of last 24Hrs
Is This Answer Correct ? | 34 Yes | 9 No |
Answer / engr.abdurrahim
Dear Deepak,
Power factor is the cosine factor of the voltage & current
phase difference. Its a short defination. But if you go
deeply, Power factor=cos@,its depend only on load, instead
of phasewise.if you connect same load in every phase it
will show same power factor value in each phase.Because
power factor is depended upon load resistance=R & its
impedance=Z,
cos@ = R/Z,
So if you are going to calcualte the power factor of all
phase, you have to calculate all resistance & impedance of
the load. Then you can calulate the avg. power factor.
R=R1+R2+R3
Z+Z1+Z2+Z3
(Where Z=R+jXL=Impedance)
cos@=R/Z
Hope my answer will satisfy you.
Best Regards,
Engr.Abdurrahim
shaikh337@rediffmail.com
Is This Answer Correct ? | 15 Yes | 7 No |
Answer / razi zainal abidin
Dear all,
This is not an answer, actually question.
In one factory, we are dificult to measure resistance,R and
impedance, Z.
What we have is only voltage supply (3phase, 420volt), and
total current flow during maximum usage using clampmeter
(including machinery, lamp, computers, etc...)
We also have info of main transformer step down because it
is in the factory area. Normally they stated value of KVA.
And some factory already install the 'capasitor bank
regulator'
So, how we can calculate the CORRECT VALUE of capasitor
need to install?
I mean, which one is the correct KW, which one is the
correct KVA, and how to calculate existing power factor IF
the factory already have 'capasitor bank regulator'....can
we switsh of the regulator?
Is This Answer Correct ? | 5 Yes | 4 No |
Answer / reddy
By using sequence components ... (+vesequence power - -ve
seq power)/VA
Is This Answer Correct ? | 0 Yes | 4 No |
In Megger which types of test we can do ? and How it works? How to use?
explain why the secondary terminal of current transformer should not be lift open circuited.
what is the difference between megger and earth tester?
28 Answers Ashok Leyland, IOCL, RRL,
What is a fuse? How does it work? What are materials used?
what is the formulae for calculating the cable size for a given voltage and current.
What is potientiometer.What is the use of it.
Why earthing is necessary for any equipment?
Basic laws governing motor and generator
what is the principle of the single phase energy meter? and,what is the advantages and disadvantages of single phase energy meter?
what are the values of VRY,VYB,VBR,Vry,Vyb,Vbr,Vrn,Vyn,Vbn for Magenetic balance test of 100 KVA and 63 KVA Distribution transformer
how the transformer stables out zone faults? Because we use non directional O/C relays .Is there any special considerations are taking into account to overtake this?
I had attend the ITC (Indian Tobacco Company) interview (For Electrical maintanance).There they was conducted me a written test.And I was passed in that.Now They are going to conduct a Practical Interview in next round.Please help me what practical test they will ask............?