Answer / ashish patel

My dear friends,

First of all i want to introduce myself as transformer engr
having 12 years of experience in transformer field. Now in
reply of your question, if u r asking about Name Plate of
transformer, VA = 1.732 * V * Amp
Suppose In Name Plate,
HV Volts mentioned 11000 V, HV rated current mentioned 5.25
Amp, Than Transformer capacity is
1.732 * 11000 * 5.25 = 100023 VA = 100 KVA.

In the same name plate,
LV Volts mentioned 433 V, LV rated current mentioned 133.34
Amp, So Transformer capacity is
1.732 * 433 * 133.34 = 99999 VA = 100 KVA.


If you are asking about to decide transformer capacity, u
hv to calculate your total load + future expansion load.
Than you can take decision about ur required transformer
capacity.

Answer / satya

the kva rating can be determined using the formula
kva=power supplied(in KW)/power factor.
so if the transformer is feeding a load of 100MW industrial
load. then the KVA rating of transformer to be used has to be
100/.85=117.647mva
we haver assumed the power factor for industrial load to be .85

Answer / m.ulaganathan

the kva of an transformer also depends on form factors.
the usage of kva 11,33,66kva all depends on form factor
as 1.11.

Answer / ddbtechee

First Calculate Kw Load of the plant or system which is connected to that transformer.Load is not directly calculated but calculated accordingly as per plant requirement like Continuous,Intermittent & Standby. After calculating the total load of the System in Kw.For calculate KVA of the transformer we use the Formula
KVA Load of the Tranformer - Total Plant Load Connected to transformer ( In Kw) / Power Factor

For Easy calculation ,we take PF value as 0.8.

Answer / saravanakumar

This is the formulae for that, KVA=KW/P.F (At the time of
load calculations we should considered the power factor is
0.8 only.)

Answer / mallikarjuna

it is very simple by knowing the formula is kva=kw/pf then
applying the formula where kw=1oo thne pf is normaly is
0.85
therefore kva=100/0.85
117.647M VA

A commercial Building is designed with 14th floor levels with indoor substation of three phase transformer with rated capacity of 1000 Kva.The transformer delivered 65% of its rated capacity at 0.67 power factor lagging.Because of low power factor, the power customer was penalized and certain cost was charged accordingly based on every point percentage lower than 85%.This situation may repeatedly happen on the succeding energy bills of power customer.The power customer is desired to improve its historical power factor of 0.67 lagging and no further penalty be impose by the local power company on the next bill. Q: Identify the appropriate solution you want to offer to Client?.Justify SCIENTIFICALLY and MATHEMATICALLY the principles behind the solution.

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