De: Peter L. Peres

>I have no experience with 'toys' the size you indicate

  Believe me, prior to last December I didn=B4t have the experience at al=
l, I
am in my "training year".

>but with smaller generators harmonics in the output are usually indicati=
ons
of stator
>windings shorted or open (if several parallel), or a cracked magnetic
>circuit, or saturation due to permanent magnetisation of some armatures.

  That=B4s my thought too.

>Doesn't a generator of that size have some monitoring facilities that
>detect problems before it starts an earthquake and cracks the dam ?

 That=B4s the thing: we have vibration monitors and the say nothing... It=
=B4s
like
 nothing is happening.

>With a small high speed turbine such harmonics and load imbalances
>(non-sine harmonics means non-constant and periodic shaft load and thus =
at
>least torsional vibration) would cause vibration that would destroy the
>turbine in a few minutes.

  I have seen things like that happening to scale models in some testings.

  We are beginning to focus on the TCTs and other potential transformers
that bring the references to the syncronizer and all the measurement
instruments.

  Thanks for the help, Peter.

Regards,

*Carlos*
--Guri, Venezuela--

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
---
Incoming mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.712 / Virus Database: 468 - Release Date: 27/06/04

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.712 / Virus Database: 468 - Release Date: 27/06/04

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads