I I am looking to buy a 208 to 480 transformer, would I simply buy a 480 to 208 and reverse the input and outputs? it's a 3 phase system and it is being supplied by an 80kW generator, then straight to an ATS to switch power from normal to emergency.
Yes. Just don't put much over 208 v to the 208 side. I wouldn't try using it at rated capacity though.
you can do that, the thing you have to be carefull of most transformers are rated for output Voltage / Current be sure the (primary) windings are going to handle the load your are using it for (as the secondary) without overheating the transformer.
Yes that would work.Just remember that the output current would be lower.
Yes, a transformer can be used to either step up or step down the voltage. The rating of a transformer is in KVA, so you can load it to the nameplate rating either way. One thing to consider though is your system ground. When you tie your generator feed back through your step up transformer and then to the ATS . The normal power source feeding your ATS is probably a 3 phase 4 wire grounded WYE system, and your step up transformer will probably have a 3 wire Delta primary. You need to be careful, especially if your ATS feeds any single phase loads. In that case, get a transformer with a WYE - WYE winding configuration. Make sure you follow the NEC code recommendations for a separately derived source.
