Howard Substation Transformers - Manual (Page 9)

Copyright © 2013 Howard Industries, Inc. Howard Industries, Inc.
Laurel, MS 39440
www.howardtransformers.com
Document No. 2.4.18
Revision: 2
Issued: October, 2013
9
Medium Power Substation Transformers
34-10
TANK
Howard transformer tanks are
rectangular all-welded steel construc-
tion and are designed for strength,
durability, and compact form. Tank
corners are folded with welds made
six inches from corners (no corner
welds). Tanks are reinforced with
external enclosed-box bracing to
provide the necessary strength and
rigidity.
Cover-mounted lifting lugs are
provided for lifting the transformer
cover. Additional lifting lugs are
provided for safely lifting the
completely assembled transformer.
Copper or stainless-steel ground
pads are located on tank sides near
ground level. Transformer covers are
constructed of a heavy steel plate
that is internally braced and welded
to the tank. Bolted and gasketed
manhole covers are provided to
allow convenient access to the main
tank interior. Covers are supplied
with provision for a post-type fall
protection device. Other fall-protection
provisions or systems are available as
options.
The standard tank base is construct-
ed of a heavy plate steel that is
suitable for rolling or skidding in all
directions. Jacking pads are provided
on all four corners of the tank to allow
for jacking of the completely
assembled transformer.
Tank surfaces are sand blasted and
coated with a rust inhibiting primer.
After assembly and before shipping,
completed transformers are leak
tested, washed and then finished
with a durable polyurethane topcoat.
Tank interiors are painted white. Tank
covers have a slip-resistant surface
finish.
RADIATORS
Panel-type radiators provide
additional cooling to supplement heat
radiation from the transformer tank
(Figure 13). The number and size of
radiators is determined by the design.
Radiators are typically detachable
and are provided with individual
shutoff valves. Standard radiators are
made of cold-rolled mild steel that is
primed and finished with a durable
polyurethane top coat. Stainless steel
and galvanized radiators are available
as options.
OTHER FEATURES AND
ACCESSORIES
Contact the factory for other features
and accessories that are not dis-
cussed here but may beavailable as
options.
Figure 23: OLTC control