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Subject: TWL: Transformer expertise?
From: Steve Darden (steve@XXX.XXX)
Date: Sun Sep 02 2001 - 04:30:46 EDT
Dear List,
We have a 9kW 230VAC isolation transform in Adagio's machinery room. When we
are on shorepower we have a serious heat problem in that space due to waste
heat from the transformer. I've just designed a dual-muffin fan ventilator
that exhausts thru bulkhead into anchor locker (thence thru big overhead
hatch in vent position).
Before we cut holes in bulkhead, I would like to know if this is normal for
this type of transformer. Our electronics tech here in Hobart says he
wouldn't expect anything like the waste heat of this unit, even if it was
running at full capacity.
E.g., right now at ambient of 50F, the top of transformer case temp is 152
°F. That's with an 8A load, but isn't any cooler at 2A load.
The transformer design is simple - it has two primary windings 1:1 and 1:2,
plus over/undervoltage taps. We are running on the 1:1 winding, the 1:2 is
when we encounter 115VAC shore power.
I guess I'm hoping that we have a bad transformer execution. I would rather
replace the transformer than install the ventilator.
PS - on ship's power we don't have a heat problem as the genset combustion
air intake force-ventilates the space.
Many thanks,
Steve Darden
s/v Adagio
GPO 2046
Hobart, TAS 7001
Australia
0415/782-305
http://www.adagiomarine.com
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