1996-2009 Operation Technology, Inc. Workshop Notes
!hort-"irc#it I$"Short-Circuit AnalysisIEC Standard1996-2009
Operation Technology, Inc. Workshop Notes !hort-"irc#it I$" !li%e
2CORTO CIRCUITO$st&n%ar %e 'N!I(I$$$ )
I$".'n&lisis%e*allastransitorias +I$"
61,6,-.$*ecto%e'rco+N./'00$-2000-Integra%oconcoor%inaci1n%e
%ispositi2os %e protecci1n.$2al#aci1na#to3&tica%e
%ispositi2os.Caractersticas principales:1996-2009 Operation
Technology, Inc. Workshop Notes !hort-"irc#it I$" !li%e ,Purpose of
Short-Circuit Studies4' !hort-"irc#it !t#%y can 5e #se% to
%eter3ine any or all o* the *ollo6ing7eri*y protecti2e %e2ice close
an% latch capa5ility7eri*y protecti2e %e2ice interr#pting
capa5ility/rotect e8#ip3ent *ro3 large 3echanical *orces +3a9i3#3
*a#lt k'-I2t protection *or e8#ip3ent +ther3al stress-!electing
ratings or settings *or relay coor%inationTypes of Short-Circuit
Faults1996-2009 Operation Technology, Inc. Workshop Notes
!hort-"irc#it I$" !li%e :1996-2009 Operation Technology, Inc.
Workshop Notes !hort-"irc#it I$" !li%e ;Types of SC
Faults4Three-/hase -= C I,-phase is rare. Typically I>-= .B0 D
I,-phase 4In an in%#strial syste3, the three-phase *a#lt con%ition
is *re8#ently the only one consi%ere%, since this type o* *a#lt
generally res#lts in Ea9i3#3 c#rrent.Types of Short-Circuit
Faults1996-2009 Operation Technology, Inc. Workshop Notes
!hort-"irc#it I$" !li%e 6) t Sin( Vm v(t) + =i(t) v(t)Short-Circuit
Phenomenon1996-2009 Operation Technology, Inc. Workshop Notes
!hort-"irc#it I$" !li%e 0 Offset) (DCTransient State Steadyt) -
sin(ZVm) - t sin(ZVmi(t)(1) ) tSin( VmdtdiL Ri v(t)LR-e + + =+ = +
= expression following the yields 1 equationSolvingi(t)v(t)DC
CurrentAC Current Symmetrical! "ith #o AC Decay1996-2009 Operation
Technology, Inc. Workshop Notes !hort-"irc#it I$" !li%e BAC Fault
Current Includin$ the DC Offset #o AC Decay!1996-2009 Operation
Technology, Inc. Workshop Notes !hort-"irc#it I$" !li%e 91996-2009
Operation Technology, Inc. Workshop Notes !hort-"irc#it I$" !li%e
10%achine Reactance& ' ( I !AC Decay Current 1996-2009
Operation Technology, Inc. Workshop Notes !hort-"irc#it I$" !li%e
11Fault Current Includin$ AC ) DC Decay 1996-2009 Operation
Technology, Inc. Workshop Notes !hort-"irc#it I$" !li%e 12IEC
Short-Circuit Calculation IEC *+*!4Initial !y33etrical
!hort-"irc#it "#rrent +IFk-4/eak !hort-"irc#it "#rrent
+ip-4!y33etrical !hort-"irc#it Greaking "#rrent +I5-4!tea%y-!tate
!hort-"irc#it "#rrent +Ik-1996-2009 Operation Technology, Inc.
Workshop Notes !hort-"irc#it I$" !li%e 1,IEC Short-Circuit
Calculation %ethod4IkH I $8#i2alent 7 J *a#lt location %i2i%e% 5y
e8#i2alent K4$8#i2alent 7 is 5ase% 5#s no3inal k7 an% c *[email protected]
an% 3achine K a%M#ste% 5ase% on c3a9, co3ponent K ) operating
con%itions1996-2009 Operation Technology, Inc. Workshop Notes
!hort-"irc#it I$" !li%e 1:Transformer , Ad-ustment4 NT -- Net6ork
@.EL4 N!,N!O
