Combining Turbine Outputs? [RE-wrenches]

[Matt Tritt]

Charlie,

Of course you're right about the variable voltage not being an issue. The
issue is actually the ultra-conservative stance adopted by many utility
employees regarding inter-connection with a private generator.

Having been a Windmatic ( as well as Bonus, Nordtank, and others) dealer at
one time I think you summed it up pretty well! Don't forget slippery ladders
and squealing brakes.

Cheers,

Matt T
----- Original Message ----- 
From: "Charlie Robb, Element Engineering" <ckr at elementengineering.com>
To: "RE Wrenches" <RE-wrenches at topica.com>
Sent: Thursday, October 23, 2003 5:19 AM
Subject: Re: Combining Turbine Outputs? [RE-wrenches]


> Hang on a minute folks, this is standard "windfarm" stuff you are talking
> about here. The turbines can all be connected direct to a single
three-phase
> cable, daisy-chained in at their incoming breakers. You don't have to
worry
> about wild a.c. or anything that applies to small battery charging
machines;
> with induction generators the turbines' output frequencies are fixed by
the
> grid, not by the turbines. Each turbine operates independently of the
others
> as a grid connected generator and there should be no control system issues
> with running multiple turbines.
>
> If appropriate (it is often done), the grid can be connected at higher
> voltage to a transformer near the first turbine, and then the windfarm
> distribution may be done at 480V. The issues of selection and protection
of
> cables,
> switchgear etc should be handled by a HV distribution/protection
specialist,
> and the utility should be involved at an early stage.
>
> Often the turbine manufacturers (if still in business) will be able to
> advise on suitable
> arrangements. If you are considering buying used Windmatics, first go
> outside on a windy day and get someone to throw buckets of oily water at
you
> while stamping on your hands with greasy boots. Then post me your wallet
and
> enjoy your last free weekend. If I can help at all at this distance please
> get in touch!
>
> Cheers
> Charlie
>
> Charlie Robb
> Element Engineering
>
> 77 Society Road
> South Queensferry
> Edinburgh
> EH30 9XP      UK
>
> Tel: 0131 331 5835
> Fax: 0131 331 5848
> Mobile: 07887 991866
>
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> ----- Original Message -----
> From: "David Blecker" <blecker at seventhgenergy.org>
> To: "RE-wrenches-topica.com" <RE-wrenches at topica.com>
> Sent: Wednesday, October 22, 2003 2:52 PM
> Subject: Combining Turbine Outputs? [RE-wrenches]
>
>
> > Windy's et al,
> >
> > I'm working on the design of a 3 wind turbine project.  Each turbine is
> > 65kW at 480V, 3-phase, 200 Amps max.  The machines will be located about
> > 700 feet from the point of interconnection (POI) and rather than bring 3
> > sets of parallel cables back to the POI, I'm thinking that it would be
> more
> > economical to combine their outputs in the field and run a single set of
> > cables back to the POI.
> >
> > Does anyone have a suggestion on what type of equipment is available to
> > establish a code-compliant 3 into 1 combiner bus? I'm imagining some
kind
> > of pad-mounted NEMA enclosure, but quite frankly, this is bigger than
> > anything I've ever done and I'm quite clueless about the options.
> >
> > Thanks to all,
> > Dave
> >
> >
> > ----------------------------------------------------------
> > David Blecker, P.E., Director
> > Seventh Generation Energy Systems
> > 608-424-1870 (ph)  424-1810 (fax)
> >
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