Open Wye 3 pot bank

New to some, but not new to all. Open Wye-3 pot bank. 120/208 Only took me about 1.5 years to finally lays my eyes on one.

It is new to me, must be an oil field thing ,so what is the advantage of it?

New to me too. What would be the need??

If you need 3 phase service 120/208 or 277/480 and all you have is two phases of primary. Climbsomemore was talking about where one of the phases on the secondary might show a little low but it's enough to fool a motor little while back.

wtdoor67 is the one who showed me where this bank was; can't remember how much experience he has with building one of these.

Top that's an open wye-open delta bank you have in your diagram.

Now there is also another configuration to what I posted utilizing two pots on a 120/208 or 277/480 service but it can only be done with a 4 external secondary bushing transformer (167kva). I have a diagram of it stashed away somewhere.

Here's a picture of a 4 bushing transformer. I believe the middle tub is a 4 bushing and the outside tubs are 3 bushing.

rcdallas wrote:If you need 3 phase service 120/208 or 277/480 and all you have is two phases of primary. Climbsomemore was talking about where one of the phases on the secondary might show a little low but it's enough to fool a motor little while back.

wtdoor67 is the one who showed me where this bank was; can't remember how much experience he has with building one of these.

I've never built one except in one of those training centers where they have the little pots to practice on.

I knew about it since the 80's but never saw one in use until I landed in Chickentown.

For the pictures, it must work, I do not think I will ever come across one in these parts, but I will keep an eye out, probably find Sasquatch first, he has been duckin me for years.

wtdoor67 wrote:
I've never built one except in one of those training centers where they have the little pots to practice on.

I knew about it since the 80's but never saw one in use until I landed in Chickentown.

If I could ever get my Ben Stein instructor back out to bring me those little pots I'd have a field day with all the things that I've learned beyond the basic bank hookups. I remember when I played with them before they do require a 3 phase hookup on them.

I tell you when I pulled over at that toll place to take those pictures I didn't know if they we're going to call the cops on me for being a little suspicious just parking and taking pictures and driving off.

Sorry to bring this back from the dead, but I would love to see a vector diagram of this if someone knows what it would look like.