Posted by Paul from MI on November 04, 2011 at 14:49:22 from (204.106.241.145):
In Reply to: Re: OT generator posted by buickanddeere on November 04, 2011 at 13:38:43:
I worked for many years in a plant with 240 volt three phase systems. In one building we had an old 240 volt delta system, with no mid-point tap for 120 volt. We used step down single phase transformers to create 120 volts. Essentially they were 1:1 transformers, with a center tap on the secondary for 120 volts, single phase. The other building had a "Red-leg delta" system, which was a 240 volt, 4 wire, three phase delta system where the center point of one phase was tapped to provide 240/120 volt single phase power. These are not uncommon systems in industry where 120 volt loads are low compared to three phase loads. The 208/120 three phase wye systems are usually used in applications where 120 volt loads are relatively higher, although we used that system in on are with a high concentration of Japanese machines which were 200 volt three phase. The 208/120 system kept the three phase voltage within 10% of nominal for those machines and avoided step down transformers. It was also within 10% of our American 240 volt three phase machine, so it worked well for us. Just a thought.
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