PQexplorer
Member
Hi all,
What issues or downsides will I have, if i install an step-up autotransformer(208Y/120-->480/277) of 160kVA right after the main facility transformer (13.2KV-208Y/120) of 500kvA. This is needed to supply a 160kVA UPS. Also, knowing that this 500kvA also supplies the rest of loads of the building, except the HVAC and the elevator.
If i can do so, What considerations (harmonics, transformer characteristics, etc) do i have to evaluate?
According (textually) to the IEEE 1100-1999 (emerald book)this is not a recommended practice:
"It is not recommended practice to step-up the voltage from the service entrance by means of a locally installed transformer in order to obtain a higher power system voltage for the electrical distribution system serving electronic load equipment. Although this can be done in certain cases, it is also possible that less satisfactory results can occur than if the system voltage at the service entrance was used"
thanks in advance.
What issues or downsides will I have, if i install an step-up autotransformer(208Y/120-->480/277) of 160kVA right after the main facility transformer (13.2KV-208Y/120) of 500kvA. This is needed to supply a 160kVA UPS. Also, knowing that this 500kvA also supplies the rest of loads of the building, except the HVAC and the elevator.
If i can do so, What considerations (harmonics, transformer characteristics, etc) do i have to evaluate?
According (textually) to the IEEE 1100-1999 (emerald book)this is not a recommended practice:
"It is not recommended practice to step-up the voltage from the service entrance by means of a locally installed transformer in order to obtain a higher power system voltage for the electrical distribution system serving electronic load equipment. Although this can be done in certain cases, it is also possible that less satisfactory results can occur than if the system voltage at the service entrance was used"
thanks in advance.