Interested to Buy Any Domain ? << Click Here >> for more details...
how percentage impedence effect on the size of the power
transformer?
- 2 Answers
- 7147 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
What is the maximum number of swithes that can be connected in series up to down stream point in an LV Distribution system?
What is the voltage gain or transfer function of amplifier?
WHAT IS VCB SAFETY
What is difference between YNyn0 and YNyn ??
what is the main difference between power devices and signal devices
what are carbondioxide and dcp used in fire extinguishers
Discuss about gear cutting machines.
How is efficiency of DG set calculated? At many places I found the efficiency to be mentioned in percentage. But at some other places I found kWH/ litres. I want to know how dimensionless percentage value is arrived at?
I have made a 3 phase thyristor full bridge rectifier. But at the moment it is working only for the half bridge operation. Both the half bridges are on operation separately but when i put it into full bridge operation the oscilloscope output is zero. I rechecked that the pulses are correct for each thyristor. what could be the possible reason for this?
Whata are the types of Cables?
Starting Time of LT & HT Motor
how can we select the type of wire.what factors we have to look on it , do we have some formula to calculate it. please guide me on it
15hp motor wound by 0.9mm & 0.95mm magnet wire. at no load test it draw 4.2A current. Another motor with same condition draw 9.2A current. How can that occur? pls help
what is charger supervision and control supervision?
What are safety device in vcb and acb?
