VPI Systems
VPI Systems
(OP)
Dear All,
Merry Christmas and Happy New 2011
Best Wishes for every body and many thanks for the received help.
I'm starting to analyze the VPI process and resins. Probably we are going to build our VPI system
Based in your experiences is better epoxy or polyester resins?
Pro and Cons?
Regards
Carlos
Merry Christmas and Happy New 2011
Best Wishes for every body and many thanks for the received help.
I'm starting to analyze the VPI process and resins. Probably we are going to build our VPI system
Based in your experiences is better epoxy or polyester resins?
Pro and Cons?
Regards
Carlos





RE: VPI Systems
RE: VPI Systems
=====================================
(2B)+(2B)' ?
RE: VPI Systems
http://w
=====================================
(2B)+(2B)' ?
RE: VPI Systems
Epoxy is not economically suited to a low through-put process because of shelf life considerations.... that is the reason many shops opt for epoxy. As a customer I would prefer epoxy all other things being equal, but we don't specify it.
should have been:
Epoxy is not economically suited to a low through-put process because of shelf life considerations.... that is the reason many shops opt for polyester. As a customer I would prefer epoxy all other things being equal, but we don't specify it.
Also here is a quote from EPRI 5036 Volume 17 (Insulation Systems) highlighting some desirable properties of epoxy
The solventless are the so-called 100% solids resins. I think those are the cadillac of resins. One could argue there is less chance of void in a resin which does not give off gases during curing.
=====================================
(2B)+(2B)' ?
RE: VPI Systems
So perhaps the shelf-life issue I was referring to early is more associated with 100% solids resins. 100% solids resins are typically epoxies. I don't know if there are any commonly used epoxy resins which are not 100% solids, but I think most Polyester resins are not 100% solids.
=====================================
(2B)+(2B)' ?
RE: VPI Systems
Stator winding bars impregnated with polyester resin were suffering from a certain expansion, this resulting in internal discharge activities. Modern VPI insulation based on epoxy resin practically doesn't expand, thus increasing service life of stator windings considerably.
Wolf
www.hydropower-consult.com