Went outta country ! life kept me busy !!
Back on !!
So Vinoth, here is the deal !…..I didnt understand your calculations :p !! no offense bro….. just keep it simple yaar.
Bout your “breaking capacity” ….lets learn from ABC…to alpha beta….
My bro (wiki) says….: breakin capacity is the current that a fuse, circuit breaker, or other electrical apparatus is able to interrupt without being destroyed or causing an electric arc with unacceptable duration. So far so good.
NOW u gotta select the value of breaking capacity….which is dependent on
1. TRANSFORMER POWER.
2. SYSTEM VOLTAGE
So, do this
( transformer power x 1000 / 1.732 x system voltage ) = this gives your breaking capacity in kA
=> MVA x 1000/1.732 x 440 [generally the system voltage is 440 V. for LT].
Bam !! u have your breaking capacity of ACB/MCCB/SFU or wotever !! Enjoy
P.S : PLEASE CORRECT ME IF I AM SMALLEST BIT OF WRONG !!