Can the efficiency of transformer be measured with the help of wattmeter readi

Can the efficiency of transformer be measured with the help
of wattmeter readings taken at primary and secondary side?
Support the answer.

Question Posted / iamdon

2 Answers
5072 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

Can the efficiency of transformer be measured with the help of wattmeter readings taken at primary..

Answer / iamdon

No,Transformer efficiency measured with the help of
wattmeter can't be reliable.

The reason is
The efiiciency of transformer is very high (order of 98.5-
99+)% due to static nature of it.The error associated with
ordinary wattmeter is in the range of 1-2 % .Under this
condition the readings taken cann't be reliable.

The efiiciency is measured with the help of data taken from
two tests namely
Open circuit test--indiaction of core loss
Short circuit test--indication of copper loss.

Author:arbelectbit@yahoo.com

Is This Answer Correct ?

2 Yes

2 No

Can the efficiency of transformer be measured with the help of wattmeter readings taken at primary..

Answer / dabangg

NO . TRANSFORMER READING IS IN KVA SO WEW CANT TAKE A
READING IN WATTMETER

Is This Answer Correct ?

0 Yes

3 No

Post New Answer

More Electrical Engineering Interview Questions

This is about the recent problem that we have faced in our project site. We have 6/7.5 MVA. 66/11kV three phase star - star power transformer. The neutral was solidly connected to the earthing mat. But because of high resistance of earthing mat (130 ohm on LV and 180 ohm on HV), one day LV side neutral earthing conductor melted and we had a huge damage. Can any one plz tell me what might happen when we connect power transformer neutral to the earthing mat which has high resistance (>100 ohm ) ?????

2 Answers

What cmos is and its benefits?

0 Answers

Are you connected Transformer neutral eathing with it's body earthing or earthing met of switch yard.? Yes or No ? why ?

2 Answers

in power station power measuring unit is KW but in transformer is KVA why?

4 Answers

two generator runnig with parallel but only one NGR on And one off Why

1 Answers

What is the end effect of linear induction motor ??

0 Answers

WHAT HAPPEN WHEN A DROP OF WATER MIXED UP WITH TRANSFORMER OIL ?

4 Answers

what is S.D.F stands for ? (S.D.F unit 80 amp , TPN )

6 Answers

LET ME NOW MORE ABOUT icu and ics for circuit breaker. how we calculate the rating of circuit breaker and i c u and ics values

0 Answers

How will I know that how many batteries I should connect to my UPS unit?

3 Answers

11 kv metering is done in my factory.Meter show PF 1.000 but kvarh lag&lead show 24&94 respectively & Avg.PF is .956 .? is what i do for inproove my PF to 1.000

3 Answers

Up to how much limit of HP of electric motor the Star- Delta Starter can be used ?

1 Answers

For more Electrical Engineering Interview Questions Click Here