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

In convertor can we use rectifier thyristor in place of invertor thyristor with explain.

0 Answers  

what is the function of RMU?

4 Answers  

what is the meaning of elecrical.

31 Answers   Infosys,

why the colour of insultor stack , petticoat is brown. Is it has some technical reason.

0 Answers  

which type motor r use in the celling fan.....

6 Answers  

phase association of 3PH L&T static CT meter is wrong. means 1PH & 1 CT connected properly and other 2 voltage and CT's inter changed. what would be the impact in the reading?

3 Answers   KSEB,

2. The heaviest and lightest strings on a certain violin have linear densities of 3.0 and 0.29 g/m. What is the ratio of the diameter of the heaviest string to that of the lightest string, assuming that the strings are of the same material?

1 Answers  

What is the winding resistsnce need to be in a 1000kva, 11kv/415v transformer, between ht winding to lt winding, ht winding to earth, lt winding to earth.?

1 Answers   Trident,

Is it required to lay 2 runs of GI wires along with armoured cables from one power DB Machines of higher rating?

0 Answers  

What is power distribution criteria for converting single phase unbalanced residential load to 3 phase star connected balance system. Does total KW converted to 3 Phase. Means Divided by root 3.

0 Answers  

could anybody able 2 send me jindal steels previous papers fr electrical steam....pls send 2 my id if possible....sirisha.shaik@gmail.com

0 Answers  

For 300MW and over a distance 250 km, what voltage be selected? and no. of circuit?

5 Answers   DPL, NTPC,