Can any one advised me how we can measure the losses in a 11kV/415v power trans

Can any one advised me how we can measure the losses in a
11kV/415v power transformer? We have no access to the
incoming mains into the primary of the transformer.

Can one derive something useful by measuring temperature
rise in the transformer?

Question Posted / bharat gupta

1 Answers
3444 Views
Dexdyne, I also Faced
E-Mail Answers

Can any one advised me how we can measure the losses in a 11kV/415v power transformer? We have no ..

Answer / rk

losses in transformer are 1) core loss2) copper loss
copper loss is proportional to current . the resistance of the copper changes with temperature. approximately it is 1.2 times at 85 degree celcius as compared to 40 degree ambient.so
total power consumed by the transformer during no load conditon can be read from the wattmeter connected in the primarry. this will give the core loss which varies with the loading of transformer insignificatly lets say 1000W.

now if transformer is distribution type or generation type.

maximum efficiency is when core loss = copper loss

so total loss at 50% loading is 2000w
copper loss at 100% load will be approx 4*1.2*1000=4800w( 4 due to doubling of current , copper resistance almost increases by 20% from 40 to 85 degree celsius rise

so total loss at 100% load = 1000+4800w=5800w

Is This Answer Correct ?

0 Yes

0 No

Post New Answer

More Power Plant Engineering Interview Questions

Why high pressure turbines are single flow

3 Answers

which safety valve will open first if steam is not been supplied to turbine.

3 Answers Wartsila,

what is the relation between the grid voltage and generator voltage how to link up generator with grid

3 Answers NDFL,

Why we need to maintain furnace and secondary air dp.if it increase or decrease what happens.

1 Answers

Is it not bad to bleed steam from turbine stages before utilizing its energy.

2 Answers

can u please tell me how to calculate the concrete quantity for a under reamed pile? r=300mm,depth=3m for a cylinder and for bulb l=.750mm,width=.525

0 Answers

what is scanner air fan & how dose it work & is there any interlock in power plant

3 Answers APGenco,

What happen when the AVR of the generator fails? Will it cause power instability and total failure of the alternator?

8 Answers

what equipment is most efficient in power plant?

4 Answers Adani,

What is the the sequence/logic of burner management system in boilers. What is purging and scavenging?

2 Answers

What is definition of hydrogen cell?and were are you use?

1 Answers

procedure of how to generate power in solar plant.

0 Answers

For more Power Plant Engineering Interview Questions Click Here