how percentage impedence effect on the size of the power
transformer?
- 2 Answers
- 6166 Views
- Bhel, I also Faced
- E-Mail Answers
Answer Posted / jaswinder
% impedence is use to determine the max fault current the
transformer is capable of delivering to a downstream short
circuit.
Fault current=FLC*100/%imp.
this fault current is use to cal fault MVA
Fault MVA = 1.732 x fault current x V.
eg: If transformer of 2000kVA,5%imp having flc of around
1200A is use to supply to a motor of same flc carrying
capacity and if the voltage drop at transformer terminal is
more than the permissible voltage drop (+- 10%)during
stating of motor then the above transformer will be of
lower rating hence we have to select the transformer rating
higher than 2000kVA eg:-3000kVA (In other words transformer
having higher SC current capability ).If voltage remain
within the rated voltage of the motor then no oversizing of
tranformer is required.
| Is This Answer Correct ? | 8 Yes | 1 No |
Post New Answer View All Answers
1600 KVA ka transformer hi aghar lt side par 800A aur voltage 420 ho to HT side ki cable ki rating keya ho gi?
IN 1000kva transformer where the oil and winding temperature sensors is connected
explain why core loss of a transformer is almost constant under different load conditions when connected across a constant voltage and constant frequency.
Why open circuit test of transformers is conducted at rated voltage??Why not any other voltage??
-How do you select cable size for a given load at a given distance from source of supply. How do you find voltage drop.
How 3 phase invertor works?
What is the difference between Generator Differential Relay and Transformer Differential Relay?
how r charge carriers produced
what mean by analog ,digital,numerical meters and relays? say the example?
I WANT BHEL PREVIOUS QUESTION
1 Ton is equal to how many watts?
what is magnetizing current test in power transformer
how to select correct size of power cable for inverter duty motor
how to select electrical equipment such as fuse,dg,transformer,motor,msb,wire,cable as per the connecting load..please mention any books to design,take licence
We have a distribution transformer of 750KVA/11kv/440v and an AVR (Servo Stabilizer) of 750KVA on the LT side of distribution transformer. Also we have an ACB of 1200A on the output of distribution transformer (that is on the input of AVR). We want to have an MCCB on the output of AVR. What should be the rating?
