Answer / nilesh

Efficiency = Output Power/Input Power

Answer / swapnil

1]first of all to calculate output power of rectifier by
using formula P=VI*PF
2]CALCULATE THE INPUT POWER BY USING SAME FORMULA.
3]CALCULATE EFFICIENCY BY USING FORMULA

EFFICIENCY=OP/INPUT*100

Answer / stanley electrician

Dear Mr.swapnil,

you have given the formula as P=VI*PF for both
input and output.
You should remember that the pf is not considered in the
DC (output of rectifier).

MY PROBLEM IS, OUTPUT POWER OF THE RECTIFIER IS GREATER
THAN INPUT. SO THE EFFICIENCY IS MORE THAN 100%. But the
efficiency must be with in 100%.

Any way thank you for your answer.

Answer / vishvesh bhatt

here, we are getting efficiency more than 287 % therefore
pls check the numbers in the example given...

Answer / vinayak

i) input = 240 vac*5 a a.c.* 0.98 pf = 1176 watts
dc side output = 54 vdc * 62.6 a d.c =3380.4 watts
since eff. = o/p / i/p = 3380.4/1176 = 287.45 %
so it will be, instead of power losses , power producing
pl. check i ac & p.f. & o/p i dc , also 240 is i
phase or 3 phase ckt?

ii) input v ac 415 , a ac 525 ,say p.f 0.8 i/p power =
1.732*415*525*0.8=301887.6 watts
output vdc 92 , adc 2700 = 92*2700 = 248400 watts
eff. = o / i put = 248400/301887.6 = 82.28 %

Answer / sanjeev dixit

How can calculate the efficency of the rectifier, input
415V AC, Current 525 AMPS, oUTPUT IS 92 v dc, 2700 A.

Answer / maxim tellis

your given data is giving more output power than input power which is not at all possible. pls check the input and output current readings again.

Answer / shrinivas

As you are saying the input 240V, 5 Amps and the PF is

The input power becomes 1176 and for output of 54V and
62.6A...then putput power is 3380.4 therefore the Efficency
becomes (1176 / 3380.4) x 100 = 34.79%

Answer / azeeem

I have a rectifier with the following conditions. I wanted to calculate efficiency.

For AC Input:
Voltage on AC = 380
Power Factor= 0.80
Amps on Phase 1 = 9.17
Amps on Phase 2 = 9.50
Amps on Phase 3 = 15.70

For DC Output:
VDC= 2.39
ADC= 1260

Thanks.

Answer / sam

input p=v*i cos pi

=1176W
dc p=v*i

=3380.4

eff 34.89%

Dear Mr B C pal...Can you plz. put some light on principle of operation of Z-Ct in conjunction to its use with 1Cx1000Sqmm HT Cables & Directional Ground Fault / Over Voltage Relays...Regd..Parag v K 9899115632

0 Answers  

What are factors to be considered while we selecting the Core Balance Current Transformer for Earth fault protection

0 Answers  

what will be project cost for 100 kv transformer connection under oyt scheme.

0 Answers  

why total tape position are odd in number in Power transformer ?

1 Answers  

why current coil has less number of turns compared to pressure coil?

8 Answers   Airtel,

What can be a rating of a transformer(KVA) if the load is about 1000KW?illustrate by showing formula?

2 Answers  

a 650 KVA diesel generator is 1500 rpm, voltage is 415V n full load amps is 805 something,when are applied load more than 400 amps it's voltage is dropping, what is the reasons...?

4 Answers  

What are reasond for high wattage in single phase induction motors

0 Answers  

Hello to all, Please someone can send me HPCL ELECTRICAL Engg. Sample papers to me? Its urjent....my email address is.... raviasiapacific@gmail.com

0 Answers   HPCL,

can we use engine degreaser for electrical motors?

0 Answers  

what is star delta starter? how it works? give its control and power diagram.

0 Answers   Bhel, Point to Point Solution, Star Wire,

why rating of generator is kva but motor is kw ?

4 Answers