How are UPS SC Contributions estimated? 2

[Wfg42438]

Hello Everyone,

In power system softwares i have seen that the UPS SC contributions are modeled by multiplying the FLA rating times a fixed multiplying factor.

I have seen this done to estimate the UPS SC contribution for the AC and DC outputs of the UPS.

I was wondering if anyone can shed some light on where this multiplying factor comes from?

Is this from the manufacturer or is this a rule of thumb from a standard or document perhaps?

I dont have a specific application in mind i just want to get a better understanding on how the UPS is modeled during a SC.

 

[mparenteau]

I don't usually use the presets in the software and get the info from the OEM. But also, since a UPS can only provide a relatively small amount of SC current (related to its source) before transferring to bypass to clear the downstream fault, I typically don't worry about it.

Mike

i.e. just model the system in bypass.

 

[waross]

You have to ask the manufacturer.
It depends on the amount of short time overload is allowed and/or if motor starting is provided for.

Bill
--------------------
Ohm's law
Not just a good idea;
It's the LAW!

 

[Wfg42438]

Thank you for the feedback

are there any sample data sheets anyone would be willing to share so i can see how the data is typically shown by a manufacturer?

 

[mpparent]

Here...try this link:

https://www.vertiv.com/49f28b/globa...t-nxl-operation-and-maintenance-manual_00.pdf

Page 57...

Mike

Mike

 

[NickParker]

Try the attachment

 

[Wfg42438]

Thank you for sharing these documents this is what I needed!