understanding xformer

[Toros]

hi
my client has a new industrial machine operating at 480v
and the available voltage-service in facility is 120/-240v, 4wire delta

Can I install an xformer: 480v-240v, 3-ph in reverse
(240v as primary and 480v as secondary)

or ,
I use an inverter
(240v as primary and 480v as secondary)
:?
????

Thank you

 

[xptpcrewx]

hi
my client has a new industrial machine operating at 480v
and the available voltage-service in facility is 120/-240v, 4wire delta

Can I install an xformer: 480v-240v, 3-ph in reverse
(240v as primary and 480v as secondary)

or ,
I use an inverter
(240v as primary and 480v as secondary)
:?
????

Thank you

You can get a transformer specifically made for reverse (step-up) operation.

 

[GoldDigger]

Because of potential problems with the voltage ratio under load and with the inrush current when energized, not all transformers are recommended by their manufacturer for reverse usage. Check with the manufacturer of the transformer you want to use.
In the US the NEC now requires that the transformer be marked or described as OK for reverse operation before allowing such use.

 

[jim dungar]

You can get a transformer specifically made for reverse (step-up) operation.

:thumbsup:

These units usually have 480Y/277 secondaries, so it is easy to solidly ground it instead of leaving it ungrounded or corner grounded, both of which have application issues.

 

[LarryFine]

In other words, you want a 240v delta to 480/277v wye transformer.

 

[Toros]

In other words, you want a 240v delta to 480/277v wye transformer.

YES