Answer / pravin sathalpara

it is depend upon the load beacause trasformer equistion
is
kva=VICOS
SO,OUR VOLTAGE AND CURRENT(LOAD) IS DECIDE FIRST

Answer / bhagaban barik

KW=KVA*P.f
i.e- KVA=KW/p.f

It also depends on Utilisation factor & maintenance factor

we have to consider 30% margin for future expansion

Answer / papuraj

Its purely depends upon your maximum demand nothing else.For an example if you have the connected load is 700kva and maximum demand is only 350kva, hence we could select 500kva transformer to be with 20% future additional load.

Answer / rajani

SIZE OF TRANSFORMER DEPENDS THE FOLLOWING


CONNECTED LOAD EX:2500KVA
MAXIMUM DEMAND EX:1500KVA
STARTING LOAD EX: 500KVA
LOAD FACTOR EX:0.9
FUTURE LOADS EX: 20% EXTRA TO MAXIMUMDEMAND

SO TRANSFORMER SIZE IS (1500+500+20%(1500))*0.9=2070KVA
SO 2200KVA TRANSFORMER IS ADEQUATE FOR MAX DEMAND OF
1500KVA LOAD.

Answer / abhishek ranjan

transmer size can be calculated according to load.
its also depend on the material used.
if we use HRS in the place of CRGOS then its size will increse

Answer / mitul

Transformer size ,we can consider what is the maximum load and for future expansion 25% shall be considered

Answer / v v s reddy

Check the following conitions

1. Rating of transformer is sufficient to totao load
2. Thermal loading on the transformer during motor starting
3.Voltage available at motor terminal during motor starting
4.Voltage available at bus during motor starting

Answer / vladimir tutulaku

WE HAVE A OLD TRANSFORMER WITHOUT TARGET
HOW WE CAN DECIDE THE POWER OF TRANSFORMER

Answer / u.chandarasekar

It is Very Very Simple take one Measurment Tape

Answer / rajesh

Transformer size is decided based on the following factor.
--> Load details
--> Load factor
--> coincidence factor
--> BKW value
--> Other than this it required power factor of the loads.

By using the following formulas we can calculate the
kva rating.
cosф * KW = KVAr

(KVA)2 =( KW)2 +( KVAr)2

suppose if oil in transformer is not used than what constructional change you will do,for insulation and cooling?

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