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WIRE
By 2windy, Section Homebrewed Electricity Posted on Tue Jul 25, 2006 at 02:15:24 PM MST
Tower Wires

I was just reading Zubbly post on his 7.5 conversion. Nice job by the way. My question is that I read that he is running 6 wires down the tower. I wanted to do the same but was told here that it would be to much of lost voltage with 6 AC wires coming all the way down the tower, I would be better off rectifying it at the genny then just running 2 DC wires down. I don't plan on producing 240 volts like Zubbly, I only have 50 to 60 volts. Dose that make a difference?

WIRE | 6 comments (6 topical)

Re: WIRE (3.00 / 0) (#1)
by Flux on Tue Jul 25, 2006 at 09:02:13 AM MST

Zubbly needs 6 wires for the star/delta switch.

Unless you use a star/delta switch there is no point in bringing down 6 wires unless you have 2 parallel circuits.

It is cheaper on wire to bring down 2 wires with dc rather than 3 wires with ac.

you need an extra wire to do it with ac for the same volt drop.

Without knowing what your 6 wires are it is not possible to comment, but it would be silly to bring down the star point unless you intended to do a star/delta change.

Flux

Re: WIRE (3.00 / 0) (#2)
by 2windy on Tue Jul 25, 2006 at 09:09:19 AM MST

Thank you for clearing my mind, I have a 3 phase conversion and thought maybe I should bring the 3 seperate coils down to my bridge rectifiers at the base of the tower.

[ Parent ]

Re: WIRE (3.00 / 0) (#3)
by Flux on Tue Jul 25, 2006 at 09:43:23 AM MST

In your case there would be little point in bringing down more than 3 ac leads. Sometimes it is more convenient to have the bridge at ground level but if you don't mind it being in the air it is cheaper on wires to run the dc.

The problem is quite serious at 12v but at higher voltages the cable issue is not usually a significant problem and I doubt you would notice any real difference in loss with 3 ac wires or 2 dc, using the same cost of wire.
Flux

[ Parent ]

Re: WIRE (3.00 / 0) (#4)
by 2windy on Tue Jul 25, 2006 at 11:22:10 AM MST

The reason I am bringing 6 wires out is because I have 3 bridge rectifiers , one for each coil, then I am hooking the the + and - in series to get more voltage. Does this make any sense?

[ Parent ]

Re: WIRE (3.00 / 0) (#5)
by Flux on Tue Jul 25, 2006 at 11:32:21 AM MST

Yes it makes sense. The snag is that to get that scheme to work properly you need capacitors across the bridges and it would not seem a very good place for them up the tower.

This series connection only works reasonably for small machines and at low current the line loss is not likely to be a big issue.

If you can get what you want without the capacitors then keeping the bridge on top would be easier.

Without capacitors you may be as well off with a normal 3 phase bridge and star connection, only experiment will find you the best way.
Flux

[ Parent ]

Re: WIRE (3.00 / 0) (#6)
by wooferhound on Tue Jul 25, 2006 at 01:55:54 PM MST

W o o f -={(

[ Parent ]

WIRE | 6 comments (6 topical)

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