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Dry Type Xfrmr in 95% RH application

Dry Type Xfrmr in 95% RH application

Dry Type Xfrmr in 95% RH application

(OP)
Is there any special considerations to take into account for using a small transformer to step-up 208 3 phase to 230 3 phase in a very humid environment...as in 95% or so relative humidity?  It would either be an 18 kVA for powering a group of pumps or 75 kVA for powering all of the pumps (21 total).  Imagine a large aquatium and fish shop in Atlanta (hot).

RE: Dry Type Xfrmr in 95% RH application

Encapsulated cores transformers are available up through about 27 kVA.  These would be fine to use in a humid environment.  For your application, you need a autotransformer connection to boost the 208V to 230V.  This would actually be quite a small transfomer if you use an autotransformer connection, since the voltage difference is small.  

Check with GE, Cutler-Hammer and Square D.  They can probably help you out.  

RE: Dry Type Xfrmr in 95% RH application


On dpc’s suggestion, if a boost to 229V from 208V is adequate, two 120:24V 5kVA transformers in an open-delta arrangement could do it for a 75kVA load.  

An issue may be enclosure susceptibility to corrosion; requiring units not “off-the-shelf.”
  

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