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
2700 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

what is the defenation of efficiency in the high pressor boiler? what is the formila of efficiency in the high pressor boiler?

3 Answers

what is the condition of transformer parallel operation ?

3 Answers BEDL,

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

3 Answers NDFL,

What is A.T.T.?

4 Answers

What is excitation current and voltage in hydro power plant ?

1 Answers ISS, Perfect Line,

Difference between electrical and electronics?

7 Answers Power Plant,

What is the over speed in turbine? What is critical speed?

3 Answers

What happens if there is no HP and LP By-pass.

5 Answers

Boiler capacity is 5ton, what will be the feed water tank capacity?

11 Answers dscl, Indiabulls, Krest, TCS,

Due to the sensitive earth fault Our Power plant Get Tripped Several Times, It happens in the morning time daily, When temperature rises that means sun rises the earth fault current get lower, in this situation What should I do to get rid of this Problem?

2 Answers

what equipment is most efficient in power plant?

4 Answers Adani,

What is MFT and when it is acted.

2 Answers HPCL,

For more Power Plant Engineering Interview Questions Click Here