What type of Delta?

klvn

What type of Delta hook-up gives up a high leg?

emolatur

"high-leg delta".

emolatur

No joke. That's what it's called... or "center-grounded delta" but that name irritates me since the center of a triangle is just a void.

http://en.wikipedia.org/wiki/High_leg_delta

nap

it's the center of one of the windings that is grounded. That is why it is called center grounded or center tapped.

.

frenchelectrican

4 wire high leg delta system.


I know it sound little funny but really the high leg is actally 208 volts from wild leg to netural and not often used in resdentail beside few older spots still have it but commercal / industrail still used them but not really widespread anymore due the safety issue with 4 wire delta system and this kind of set up is genrally not a DIY item at all if you are not aware with the connections.

That one thing many POCO are dropping it out going with full Wye connection.

Yeah there is other delta system out there but right now I am not going to list it for now unless you request it.

Merci.
Marc

emolatur

? I know this. It's the system the OP was originally asking about.

I know what the term means - I just don't like it.

nap

Just trying to toss some explanation into the situation. Your statement about the center of a triangle and all was likely a bit confusing to the OP. I know what you meant but it is likely the OP didn't.

emolatur

True dat.

AllanJ

To put a neutral in the center of the triangle we use the wye system as opposed to the delta system. Then we get the 120/208 and 277/480 volt systems.

Theoretically each of the three transformer windings producing one delta 3 phase system can be center tapped allowing balanced 120/240 volt loads on each of the AB, BC, and CA leg pairs. But in practice this can never be done because only one of those neutrals can be grounded.

A delta system is either high-leg (usually the high leg is designated B) or does not have a fourth wire as a neutral (is 240 volt only in the case of a 240 volt system).

__________________
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emolatur

Ahem... corner*COUGH*grounded*HACK*

oleguy74

high leg on delta is not a corner grounded sys.

oleguy74

also with a 480 wye,you can connect any phase to N and get 277 single phase for lighting.

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emolatur

does anyone follow continuity on here?

oleguy74, I was responding to the guy I quoted. I'll leave it at that because I'm in such a mood right now that any further would result in some people learning a new vocabulary.

oleguy74

yeah,i would not want you to learn something...and put you in a bad mood.

emolatur

Wow...