MIL-HDBK-1004/10
Features now available on most units include:
6.5.3.1
Available Features.
a)
Constant voltage or current output
b)
Multiple circuits in the same enclosure
c)
Air cooled or oil immersed
d)
Any commercial input voltage
e)
Three phase or single phase
f)
Center tap or bridge
g)
Wide range of output currents and voltages
h)
Efficiency filters to reduce ac ripple
i)
Interference noise filters
j)
Explosion proof enclosures
k)
Small arms proof enclosures
l)
Lightning protection on both ac input and dc output
m)
Surge protection on both ac input and dc output
n)
Silicon diodes or selenium stacks
o)
Painted or galvanized cases
p)
Various mounting legs or brackets
q)
Units designed for direct burial
r)
External "on-off" indicators
s)
Variety of price, quality and warranty
t)
Maintenance free anodized aluminum enclosure
Factors that should be considered in selecting appropriate features for a
specific application are given below.
Air Cooled Versus Oil Immersed. Rectifiers can be supplied as
6.5.3.2
either entirely air cooled, entirely oil immersed or with the stacks only oil
immersed. Air-cooled units are lowest in cost and easiest to install and
repair. However, oil-cooled units should be specified where corrosive or
dirty atmospheric conditions are encountered or where explosive gasses may be
present. The controls should not be immersed in the oil. Air-cooled units
require more frequent maintenance to clean the air screens and other
components and are also susceptible to damage by insects an other pests.
Older oil-cooled units were supplied with oils containing polychlorinated
biphenyls (PCBs) which have been determined to be carcenogenic and are no
longer supplied with new units. Units containing PCBs should be treated
according to current policy regarding PCBs.
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