Answer / thakur

Simply calculate total KWH and KVH of last 24 Hrs and
Divide into-Total KWH/Total KVH=Avg PF of last 24Hrs

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

Answer / deepak

thanks, but cosider that R ph pf is 0.8,y-ph pf is 0.6,and
b ph pf is 0.7 what vlb the overall pf of three phase
unbalanced 3phase system .

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?

Answer / reddy

By using sequence components ... (+vesequence power - -ve
seq power)/VA

what is ALF and ISF in current transformer?

1 Answers  

how does we calculate the capacity of battery

1 Answers   MTS,

In aircraft,why we use 400 htz equipment.and use common earthing

1 Answers  

what is the relative size of single and three phase?

0 Answers   Student,

what is vector surge & vector shift? we have 25.3 MW(11kv) generator & 11kv/132kv transformer, connected with with 132 kv grid.vector surge relay is tripping frequentaly.what is permissible maximum limit for this.

3 Answers  

1,Building containing 25 flats how much Amp 3 pole MCCB are required? 2, For the safey of each flat how many Amp RCCB can install -loaded with A/C

1 Answers   L&T,

What is main cause of cable's terminal point burned in Lug on high temperature although lug and cable selection is ok as per stantard and also tightness is ok as per situation. so please take in deep and tell correct answer thanku.

1 Answers  

if flux and load static in dc motor and supply voltage increases 20% then what happened in speed

0 Answers  

why there is a fault occurs, if a phase wire touches ground.. and the fault not occurs when we connect a bulb between phase and ground..??

1 Answers  

for leading power factor penalty by SEB why

2 Answers  

how is positive, negative, zero sequence is happen.. how is effect on 3 phase system

0 Answers  

how to check the continuity of a cable with a megger

4 Answers   Metro,