Fungus Proofing and Tropicalization of motor windings

[desmondzzz3]

Hello...

I ran a Search here at eng-tips and only came across a brief exchange of the above topic, without solution - in my case..
I am trying to learn more about the tropicalization methods / materials that one can apply to an electric motor. In this application (diesel-fired genset alternator) I have a gentleman who references his "tropical" as the "green stuff".. And he doesn't have a spec...
Can anyone make suggestions to a site or link where I can learn more about tropicalization? Pros & Cons?

Thanks very much,

Desmond

 

[7anoter4]

See:
thread237-216369
MIL-F-13927A, MILITARY SPECIFICATION, FUNGUS RESISTANCE TEST

http://www.everyspec.com/MIL-SPECS/MIL+SPECS+(MIL-F)/MIL-F-13927A_8035/

http://npic.orst.edu/RMPP/rmpp_ch15.pdf

http://www.energy.siemens.com/hq/po...wnloads/GEAFOL_cast-resin_transformers_EN.pdf

Tropicalizing that means:
50°C ambient, weatherproof per IEEE 45
'Tropicalized' motor option - electrical components are sealed against humid conditions
This refers to the resin used to coat the generator windings. Tropicalized windings are coated with a resin that protects the winding from adverse weather conditions and salt air.
Insulation: Mixture of epoxy resin and quartz powder makes the transformer nearly maintenance-free, moisture-proof, tropicalized, flame resistant...

 

[motorman]

Tropicalization, refers to treating the windings to inhibit fungus and mildew growth. It is a common requirement for electrical equipment that is shipped to remote tropical areas that will not be immediately energized. I seen some awful thick fungus growth on windings appear in just a couple weeks at a site.

The pros- can help control organic growth and is cheap and easy to apply. Simply mix the fungicide additive in with the varnish used to coat the windings.

The cons – It doesn’t last all that long. Manufactures claim up to three years protection but I would be afraid to trust it more then a year in a rain forest area. Another thing is that after it is applied, since it is a paint additive, it is hard to see if there really is any protection there. So look for an additive that can be seen under a UV light [glows greenish-yellow which may be where your customer came up with “that green stuff”]so you can check adequacy of the coverage.

Try doing an internet search on paint additives to control mildew

 

[Hoxton]

I am no historian (just old), but did not the requiremt for "tropicalisation" come from the days of Class A insulation, which was paper based (1950's). Now we have class F, which is epoxy resin based, what can the bugs eat? Yes, you can get fungus growth, but what effect does that have?