How do we calculate short circuit current? why is short circuit current in Kilo Amp?

Short circuit KVA(MVA) divided by % impedance. At the time of short circuit  , the current will be very high due to short circuit impedance or resistance which  will be very small or Zero

The short circuit current is infinity because the resistance at this circuit is Zero 

 

by ohm law ..becouse the volte and impdans is low

MVA Method is an easy way to find short circuit Calculations. Compared to other methods that are Ohmic and Per Unit Methods. The conversion formulas used for both these methods are complex and not easy to memorize.

The calculating procedure for an example network is mentioned below please have a look

https://electengmaterials.com/short-circuit-current-calculation-mva-method/

 

Thanks for asking;

When short circuit occurs, the resistance of the circuit becomes zero allowng maximum current to flow through as there is no obstruction to electron flow

The Whole current passes through the short circuit .The current before that node is the current passes trough that short circuit.

It can be calculated using Ohm's law.

Short Circuit Current is immensely high current which arises the need of its calculation to be in large unit such as Kilo Amps, there are number of ways to calculate short circuit current one of the method is by evaluation of " M " Multiplier factor and " f " factor  where M = 1 / 1+ M   ,

f = 1.7 X Length of conductor X Current at beginning of Ckt /   no. of conductors X Conductor Constant X Voltage

 

And so Short Ckt Current = I s.c = current at beginning X M

V=RI =>I=V/R it is dangerous to measure current in short circuit i recommended not trying it since it may damage the equipment tou are using or it may hurt you since to measure current you need to connect a multimeter in series and wirh no loud the current will be infinite according to the rule and in real life it will be very high.

find out the resistance of short circuit and applied voltages then use ohm's law to find the short circuit current.

the short circuit current are in kilo ampares because there are low resistance in short circuit so low opossition to the flow of current

Short circuit current is in killoamps Because short circuit means zero resistance. I=V/R . So, anything divided by zero is infinity. As in reality, infinity cannot be defined. So, the maximum current possible will be drawn at the short circuit