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 |
374kvar capacitor bank connected across 600kw,6.6kv motor.what will happen if motor run at 50% , whether full kvar applied or half?
How will polarity test of Dy5 Transformer ?
what do you mean by switchgears?
5 Answers Practical Viva Questions,
pls tell what are doing the three phase motor star and delta connetion with circuit diagram and control wiring .
what is the difference between active power and reactive power and apparant power in practical as well as theoritical
How much resistance between neutral earthing and body earthing of Power transformer?
What is meant by Active and reactive power?
23 Answers College School Exams Tests, Schneider, Torrent Power,
What is mean by nominal voltage,Explain?.How much nominal voltage?.
what is upper impedance and lower impedance of a distance relay
Is it mandatory statutory requirement of transformer oil filtration annualy despite oil is withstanding required dieelectrical strenth and all others parameters
In PFI plant one stage capacitor connection is directly connected(with out megnetic contact controll). but why?
Will The Rated Capacity of 20 MVA ,220/6.6 KV, ONAN cooling Power Tranformer be increased up to 25 MVA with respect to its %Impedence by ONAF cooling with same rating..?