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

What is the difference between XLPE & FRLS cables? Is FRLS cables is a type of XLPE cable or both r different?

5 Answers  

What is principal to reduce earth leakage current with isolation transformer? When isolation transformer is installed in input stage of system, earth leakage current is reduced. the reason is why the leakage current of 2nd stage of isolation transformer does not affect the 1st stage's leakage current. I would like to know the reason. As you know, earth leakage current is a kind of AC. So, How to reduce earth leakage current in case that isolation transformer is used?

2 Answers  

I have seen 1 video in which a person getting shock while standing at top of a train,i have 1 question? why the people sitting in the train doesn't get shock while that man getting shock from top of the train? How the earthing of train works?

17 Answers   Bhel,

have u any web site who can give all electrical sum's to solve counting easy like how to convert 1kw=?Kva.

1 Answers   Marriott,

what does a k rating in a transformer means?

0 Answers  

WHAT IS THE DG OIL SPECIFICATIONS AND WHAT IS THE DIFFERENCE BETWEEN THE DG OIL AND TRANSFORMER OIL

4 Answers  

In India the supply voltage is 230 volt A.C. During the negative half cycle phase becomes neutral and neutral become phase? or what will happen during negative half cycle? how the electrons flow during positive and negative half cycle?

0 Answers   ITI,

Which UPS (inverter) is better and why ? 12 V inverter and 24 V (two 12 V batteries in series) inverter which is better ......... which has the longer backup which has the greater charging time which has the greater discharging time thank you

2 Answers  

What will happen if the d.c. Machine is operated below rated speed?

0 Answers  

can we use NPT glands in LT panel

0 Answers  

How we can calc. the Backup time of a battery Bank???

6 Answers   Emerson,

what is transformor oil gread

0 Answers   Idea,