IEC60909 or IEC 61363-1

[Murlinor]

Hello.

I am working with short circuit calculations on subsea electrical installations. Which standard IEC shall be applied IEC60909 or IEC 61363-1?

Thank you.

Best Regards
Murli

 

[7anoter4]

If your Electrical Installations are for Ships or Mobile or fixed offshore Units IEC 61363-1 is indicate to follow since IEC 61363-1 it is:
IEC 61363-1 "Electrical Installations of Ships and Mobile and Fixed offshore Units - Part 1: Procedures for Calculating Short-Circuit Currents in Three-Phase a.c." See:

http://electronics.ihs.com/document/abstract/XDOZCAAAAAAAAAAA

 

[Murlinor]

Hello friend.

That means short circuit calculations for subsea installations, one should use IEC60909. Since IEC61363 only covers electrical Installations of Ships and Mobile and Fixed offshore Units.

Please advice

BR

 

[7anoter4]

IEC 60909 classify the fault current according to their magnitude (maximum or minimum) and fault distance from the source (far or near). Far from source and near to source classification will determine whether to include the decay of the AC component of the fault current.
In IEC 60909, an equivalent voltage source at the fault location will replace ALL VOLTAGE SOURCES. A voltage factor will adjust the value of the equivalent voltage source for the maximum and minimum fault current calculations.
If the subsea electrical installations are more or less like a usual substation or power station interconnected, on mainland, you may follow the IEC 60909 procedure. But if there are distributed generators like DG or other included here, so the "far from the source" is not clear as the "main source" is outside and may be "far away".
IEC 61363-1 calculation methods are for use on unmeshed three-phase alternating current systems, but will take into consideration all source independently.

 

[PrebenJakobsen]

IEC61363 only calculates the symetrical short circuit current. If you want to calculate unsymetrical currents you might use IEC60909

Best Regards
Preben Jakobsen

 

[7anoter4]

You are right,PrebenJakobsen.Thanks!