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Short circuit calculation
3

Short circuit calculation

Short circuit calculation

(OP)
Hi

What is the difference between IEEE and IEC short circuit calculations

RE: Short circuit calculation

Ok...I'll bite.  Do you mean "the difference between the ANSI and the IEC methods" of SS calculations?  I don't believe IEEE has a method.

Mike

RE: Short circuit calculation

(OP)
Yes I mean IEEE/ANSI method
I ask this question because I want to know how the ETAP software calculate the short circuit with method
http://etap.com/shortcircuit.htm
Thanks

RE: Short circuit calculation

I believe the difference is in how the device interrupting ratings are determined and compared to the calculated fault currents.

RE: Short circuit calculation

(OP)
In the ETAP software the value of the short circuit with IEE/ANSI and IEC are different

RE: Short circuit calculation

Per ETAP,

"In ANSI/IEEE short circuit calculations, an equivalent voltage source at the fault location, which equals the prefault voltage at the location, replaces all external voltage sources and machine internal voltage sources."

"In IEC short circuit calculations, an equivalent voltage source at the fault location replaces all voltage sources. A voltage factor c is applied to adjust the value of the equivalent voltage source for minimum and maximum current calculations."

There are many other differences; the complete details are explained in the ETAP Help section. Look at Chapter 15 - Short-Circuit Analysis; Calculation Methods.

RE: Short circuit calculation

More appropriately I guess is...where are you?  If you're in the US, Canada, etc, you'll want to use the ANSI method.  If you're in Europe for example, IEC.

Mike

RE: Short circuit calculation

Try to obtain a copy of Conrad St Pierre's book: A Practical Guide to Short Circuit Calculations. It contains chapters with explanations and examples of IEEE and IEC calculations. That is if you are interested in the differences between the IEC and IEEE methods.
If you want to choose between one of the two, I would agree with Mike's last comment: "where are you?"

http://www.epc-website.com/
short-circuit book

Regards
Ralph

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