Answer / kannan.sj

first u should know
1,The connected load of transformer or load factor
2,Highest connected load / motor in the transformer and its
starting type
3, diversity factor
because
KVA demand at 0.8 p.f =connected load x LF x DF
-------------
efficiency X p.f
starting current of highest KW load takes 6 times of full
load current. so we to check it whether the transformer has
the capability to feed the load or not during starting. its
the important thing while considering trafo selection..

Answer / satyam

VOLTAGE & CURRENT

Answer / guest

You need to know the load type and calcuation of schort
circuit

Answer / ravi k lavu

Total connected load of plant

Answer / ahfaz

1] we have to know the KVA load required
2] we have to know the percentage of impedance in the winding
3] Indoor or Outdoor
4] Type of cooling
5] Maximum temperature required

Thanks & regards

Ahfaz

Answer / shaista

SECONDARY LOAD VOLTAGE
KVA Rating
application of use

Answer / mohammed hussain a

Load Current,Load Voltage and Load Power factor(Secondary
Side). It may 3 Phase or 1Phase.

For 3phase Power in KVA = 1.732*V*I/0.8*1000

For 1 Phase in KVA = V*I/1000.

The rating of the transformer can be identified from the
above formula.

Answer / mgm

calculate all connected load like lighting load power load
motors ahu etc, calculate the 3 phase current and multiply
it with 1.25%
we will get the transformer size

Answer / dinesh kumar

1.Load factor
2.Diversity Factor

Answer / manasa

First we have to know about the load consumption, then
diversity factor that is demand in KW and then in KVA

Why resistance is not measure in running conditions of motor

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I hv a question regarding power factor improvement just after transformer. I request you to reply me plzz. thank you sir. My friend has a small unit of fabrication. in his factory the main load is a welding machine, lathe machine, grinding machine. this load is not continuous type. now our electricity board has installed 16 KVA, 11000/433 V transformer for our factory. In the energy meter (trivector meter) at LV side of transformer, i hv seen power factor value of 0.15 only when only 3 KW load was flowing. Further electricity board has suggested to install 4 KVAR capacitor at LV side after energy meter. Now my question is that if we permanantly install and switch on 4 KVAR capacitor after energy meter, during some load on transformer and also without any load on transformer, wht will be the power factor shown in energy meter?i dont want to get any penalty by electricity board, so plz suggest me if i can permanantly install and switch on the 4 kvar capacitor or not at LV side of transformer just after energy meter? Thank you again and awaiting for ur positive reply soon.

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