Combining Turbine Outputs? [RE-wrenches]

[Charlie Robb, Element Engineering]

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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