The transformers you are looking for exist: https://www.grainger.com/product/ACME-ELECTRIC-General-Purpose-Transformer-49NT19?s_pp=false&picUrl=//static.grainger.com/rp/s/is/image/Grainger/49NR92_AS01?$smthumb$ Of course a used one is preferrable.
I'm assuming you've done the research to make sure it needs both 400VAC and 240 to common. I know at least one machine I have here says it needs 240V, but there isn't actually anything 240V on it - it really only needs 120V, admittedly at twice the amperage. I've also seen gear which only needs the leg-to-leg voltage, and doesn't use the leg-to-ground voltage. On Fri, Nov 25, 2016 at 1:26 PM, <[email protected]> wrote: > So what I shoulda bought was a 240:480 and fed it with 208 for 416 out. > > -----Original Message----- From: [email protected] Sent: Friday, November > 25, 2016 1:15 PM To: [email protected] Subject: Re: [AFMUG] OT 3 phase > transformers > I didn't think the saturation would happen without a load. > Was only considering transformation ratio, dang. > Never a problem with small signals... > > Still need to make 400 volts Y. > I guess I am going to have to do some kind of boost or buck arrangement. > -----Original Message----- From: Seth Mattinen Sent: Friday, November 25, > 2016 1:10 PM To: [email protected] Subject: Re: [AFMUG] OT 3 phase > transformers > On 11/25/16 11:49, [email protected] wrote: > >> I purchased a used 30 KVA 208/240 2 phase transformer. 208Y 240 delta. >> > > > You're feeding 480 into a general purpose transformer that is rated for > 240 (+-10% typical)? You're saturating the core and it's ceasing to be a > transformer. Even if the breaker doesn't trip it'll probably overheat and > burn with that much overvoltage. > > ~Seth > -- *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 [email protected] | http://www.packetflux.com <http://www.linkedin.com/in/fwchristian> <http://facebook.com/packetflux> <http://twitter.com/@packetflux>
