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UPS Fault Level Calculation

Semaj

Does anyone know if there is a standardised way of calculating fault levels at the output of a large UPS like IEC60909 does for transformer and generator supplied faults?

I imagine things will change between manufacturers but a good rule of thumb would be very useful as it seems that no matter the installation, downstream of the UPS the breaker settings have been poorly thought out and my concern is that these downstream circuits will not actually acheive ADS due to the fault level being too low to trip the downstream breaker because the trip settings are too high.

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    I raised a similar question last week, which has a similar issue for stand-by generators, I still haven’t got to the bottom of this, particular when a power distribution has been initially design around the supply transformer, what parameters would you use to disconnect ADS, clearly when a UPS or Stand-by generators are in circuit parameters are totally different and react so under fault conditions.

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    I raised a similar question last week, which has a similar issue for stand-by generators, I still haven’t got to the bottom of this, particular when a power distribution has been initially design around the supply transformer, what parameters would you use to disconnect ADS, clearly when a UPS or Stand-by generators are in circuit parameters are totally different and react so under fault conditions.

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