Three phase UPS system
Three phase UPS system
(OP)
We are installing a ups with an output of 208volts three phase and neutral ie 120 volts phase to neutral.
The system is rated at 80kVA. The system will be supplying critical instrumentation on a petro-chem complex. The supplies to the loads will be 3 x 120 Volt line-neutral.
My question (very basic I know!):
What will be the power available in each leg?
Is it 80kVA / 3 (ie 26.7kVA), OR 80kVA / 1.732 (ie 46.7kVA).
Regards,
TC
The system is rated at 80kVA. The system will be supplying critical instrumentation on a petro-chem complex. The supplies to the loads will be 3 x 120 Volt line-neutral.
My question (very basic I know!):
What will be the power available in each leg?
Is it 80kVA / 3 (ie 26.7kVA), OR 80kVA / 1.732 (ie 46.7kVA).
Regards,
TC






RE: Three phase UPS system
Mike
RE: Three phase UPS system
yours
RE: Three phase UPS system
RE: Three phase UPS system
If the UPS goes into operation you may ahve the output freewheel and then if you at that moment go into a manual bypass external with no reference to the UPS then you get some large currents flowing.
Usually on the larger UPS units there is some sort of internal electronic bypass - once that is in then you can put in the manual bypass and remove the UPS from service.
Got to watch as UPS's dont like the output linked to the input - if the power fails at this time you are in effect feeding the output to the input and you get some wierd results.....
Just my tuppenny's worth.
Rugged
RE: Three phase UPS system
Mike
RE: Three phase UPS system