very well with one question... do u mean percentage impedance the voltage impedance since there is no percentage impedance on name plate of transformer it's percentage voltage impedance?
is this calculation same for three winding t/f because secondary side we have two windings .rating is changing for each winding then how can we caliculate
Actual value is always less than what you calculated because you have to add the cable impedence and also generator impedence which when added will limit your sc current but never the less this is a good approximation in sizing your breakers
In your formula to find the FLA, would you always multiply the kVsec by the square root of 3 (e.i., 1.73...) even if this were a single-phase system? How would this formula differ?
It should be 31373.91 A (Amperes). If you divide 31373.91 by 1,000 it would equal 31.37 KA, but both are correct. For example: 450 A = 0.45 KA See how that works? They both equal each other? This same conversion can be used for watts, ohms, volts, and many other units of measure.
Very useful. I have posted a video titled 'short circuit calculations for distribution systems' with back ground theory .Please watch for more details.
Or you can just divide your nominal voltage by the circuit Ze. Also the definition of PSCC is not what you said, either. A short circuit is the unintentional interconnection of the live conductors & you don’t double it unless it’s 3 phase.
NICE EXPLANATION SO FAR IN U TUBE THANK YOU SO MUCH
Good and simple
Can u explain how to calculate no. Of earthing pit (station) for a given soil resistivity.
Thanks
Great basic video for someone like me. Our plant has a pad mount transformer I can calculate using this.
very well with one question... do u mean percentage impedance the voltage impedance since there is no percentage impedance on name plate of transformer it's percentage voltage impedance?
Is it SC between phase to phase? What about phase to Neutral?
Same kA rating we will use for breaker also or their is Another formula for Switchgear
What if the circuit breaker is on the primary side. Are you supposed to use the primary voltage instead of the secondary
so based on this calculations we select MCCBs short circuit ratings?
This applies if the short circuit happens at the transformer secondary terminals
What if it happens at the main terminals, should I then just use the main terminal voltage?
Hi , I like your lecture
hey man, where you get the formula reference ? cz i can find anywhere
In the last calculation Isc=1804*100, where did the 100 come from?
Percentage
Super explain sir, thank u 😍
is this calculation same for three winding t/f because secondary side we have two windings .rating is changing for each winding then how can we caliculate
Actual value is always less than what you calculated because you have to add the cable impedence and also generator impedence which when added will limit your sc current but never the less this is a good approximation in sizing your breakers
It's approximate calculation.
how did you derive Isc formula?
thanks bruh
In your formula to find the FLA, would you always multiply the kVsec by the square root of 3 (e.i., 1.73...) even if this were a single-phase system? How would this formula differ?
There is no root of 3 in case of single phase.
@@saadafzal7794 That makes sense. Thank you!
Kva should be fault Kva which is Kva by impedance
FLA =31373.91 AMP OR FLA = 31373.91 KA which is correct
It should be 31373.91 A (Amperes). If you divide 31373.91 by 1,000 it would equal 31.37 KA, but both are correct.
For example: 450 A = 0.45 KA
See how that works? They both equal each other?
This same conversion can be used for watts, ohms, volts, and many other units of measure.
Hello bro how we can calculate voltage impedance of transformer if we know only h 220/66kv t/f of 160mva nd also short circuit current find
Nice explanted
Thanks boss
How to calculate short circuit current for motor?
What value is 100 at the last calculation
Impedance percentage
bhai formula conceptual nahi bataya aapne
Thank u sir
Why the voltage is 480 volts at the secondary side ...it should be 440 + or -10 not 480 ...
But nice video keep it up
JOhn Does ...because all 3 phase equipments are designed on 440 volts ...if it is more than 440 or 450 ..it may damage the equipment
all the parameters used in this calculation are assumed parameters. You will get the right parameters from the transformer nameplate. thanks
here we are not considering upstream for transformer
.480 kase hua
480 Volts secondary side pe
Very useful. I have posted a video titled 'short circuit calculations for distribution systems' with back ground theory .Please watch for more details.
pls share link
Dear Prof. Could you please share the link. Thank you!
Wrong h
Or you can just divide your nominal voltage by the circuit Ze.
Also the definition of PSCC is not what you said, either.
A short circuit is the unintentional interconnection of the live conductors & you don’t double it unless it’s 3 phase.