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-   -   3 Phase power questions (http://www.homebrewtalk.com/f170/3-phase-power-questions-348783/)

_swede_ 08-20-2012 08:40 PM

2 Attachment(s)

Sorry, I don't mean to offend Huntb, but that is entirely incorrect. You are showing single phase wiring, and it's incorrectly labeled.

Cruelkix, I've built three phase control panels before, and it's not that hard to do. A fully variable controller with individual element selectivity and control and PID integration is as complicated as I've built yet, but it works. One thing you will need to do is run three elements per 3ph circuit. You state you want to run 6 5.5kw elements, where would each element be?

If you are interested in what a 3 phase panel could look like, here's one I built not long ago.


_swede_ 08-20-2012 08:40 PM

2 Attachment(s)

Sorry, I don't mean to offend Huntb, but that is entirely incorrect. You are showing single phase wiring, and it's incorrectly labeled.

Cruelkix, I've built three phase control panels before, and it's not that hard to do. A fully variable controller with individual element selectivity and control and PID integration is as complicated as I've built yet, but it works. One thing you will need to do is run three elements per 3ph circuit. You state you want to run 6 5.5kw elements, where would each element be?

If you are interested in what a 3 phase panel could look like, here's one I built not long ago.


_swede_ 08-21-2012 03:31 PM

1 Attachment(s)

This might help you out, disregard the inaccuracy of the SSR's, you know what they do. This should help you set up a sys that will work individually as well. Each element has 2 pole circuit protection here, remove it if you don't want it.

The line load on each phase will calculated according to the appropriate formula, each element will draw 23a @ 5500w. You may want to increase the breaker capacity to a 32a instead of a 25a to stay under 80% if you wish. The 40a rated ssr's I recommended will be fine.


DeafSmith 08-25-2012 05:55 AM

1 Attachment(s)

Here's what I think are the voltage and currents. Notice how the line current and element current is 30 degrees out of phase. Also the terminal voltage to "neutral" multiplied by line current is the same as the element voltage multiplied by the element current (same power) as it of course must be.

EDIT: This is for the elements connected in a delta configuration, 240 v line to line.

Attachment 73076


P-J 08-25-2012 03:27 PM

1 Attachment(s)

All,

I'm still confused beyond belief.

I just put the original diagram back in place (page 2).

I drew the diagram for using 240V 3-phase power (240V Delta transformer) as the system input.

When I illustrated the wiring within the controller, the elements are connected in a 'Y' configuration. This resulted in the actual voltage presented to each element as 208V. The elements chosen for the diagram are 5500W-240V.

Now after doing days of digging through my mess, I think I understand that I will need 40A breakers instead of the 30A shown. Each element will be drawing 19.95A, so for the set of 3 elements they will draw a total 34.34A per line from the 240V Delta power input.

I think.

Damn... I'm still confused.....

I'm have one hell of a time wrapping my mind around it all.




P-J



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