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Howard Industries offers a complete line of pad-mounted distribution transformers that are ideal for use on any residential or commercial distribution system, all designed to satisfy the most demanding requirements for safety, reliability and aesthetics.
Beginning January 1, 2010, transformers designs within the scope of DOE's final rule on transformer efficiency will meet the required minimum standards. Amorphous metal core transformers are now
available for those customers wanting to take advantage of super-high efficiency designs.
Contact your distributor or factory representative for availability of other kVA sizes, voltage ratings, features, accessories and design standards not listed.
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| Ratings |
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• KVA Ratings (65° Rise)
5, 10, 15, 25, 37.5, 50, 75, 100, 167, 250, 333, 500
• High-Voltage Ratings
4160GrdY/2400 through 34500GrdY/19920 or
2400/4160Y through 19920/34500Y
(60kV through 150kV BIL)
• Low-Voltage Ratings
240/120, with 3 low-voltage bushings
120/240, with 4 low-voltage bushings
480/240, with 3 low-voltage bushings
240/480, with 4 low-voltage bushings
120, with 2 low-voltage bushings
240, with 2 low-voltage bushings
277, with 2 low-voltage bushings
480, with 2 low-voltage bushings
(30kV BIL)
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| Standard Features |
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• Meets or exceeds current ANSI and NEMA standards
• Meets DOE efficiency standards (units covered by the DOE final rule and
manufactured beginning January 1, 2010)
• Full compliance with ANSI C57.12.28 enclosure integrity standards
• Two externally clamped universal high-voltage bushing wells
for loop feed operation or one externally clamped bushing well
for radial feed operation
• Three externally clamped low-voltage bushings with threaded copper studs,
including a fully insulated neutral terminal with removable ground strap
removable ground strap standard on 240/120 and 480/240 ratings only)
• Embossed bushing mounts
• Threaded, flush mounted stainless steel lifting provisions
• Automatic pressure relief device
• Electrical grade mineral oil with oxidation inhibitor
• Removable hood with corrosion resistant stainless steel hinge pins and barrels
• Mild steel enclosure and detachable sill fastened with stainless steel hardware
• Recessed oil compartment bottom
• Electrostatically applied powder paint finish with polyurethane top coat
for excellent resistance to chipping, fading, abrasion and corrosion
• Front panel accessory mounting bracket
• Domed top surfaces on hood and oil compartment to prevent water retention
• Oil fill/oil level plug
• Oil drain plug
• Tank grounding provisions
• Corrosion resistant locking assembly with captive penta-head
security bolt, floating nut and padlock provision
• Decal or stenciled bushing designations
• Laser engraved anodized aluminum nameplate
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| Optional Features |
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• Total stainless steel or hybrid (mild steel/ stainless steel) enclosure;
hybrid enclosure may have stainless steel applied to any of the
following components: hood, sill, oil-compartment riser, bottom/front panel,
and high-voltage bushing clamps. Available grades of stainless steel
include 409, 304 and 304L
• High density polyethylene protector strips on bottom contact surfaces
to prevent paint damage during storage and installation
• Molded polymer Pad/Pallet® serves as both shipping pallet and permanent
mounting pad; can be factory mounted to transformers through 50 kVA
• Temporary service access provision (conduit hole)
• High-voltage, load break on/off or sectionalizing switch
• Fault indicator or Fault indicator provision only
• Load break high-voltage bushing inserts
• Removable low-voltage ground strap (standard for 240/120 and 480/240 ratings)
• Low-voltage terminals, including various screw-on spades or slip-fit connectors
• Internally mounted expulsion fuse (alone or in combination with internally
mounted, partial-range current limiting fuse)
• Draw-out expulsion fuse in combination with internally mounted partial-range
current limiting fuse or isolation link
• Draw-out (dry well) full-range current limiting fuse
• Drip shield for use with draw-out expulsion fuse
• Internally mounted full-range current limiting fuse
• Low-voltage circuit breaker with or without emergency overload lever
• MOV high-voltage lightning arrester: external plug-in elbow type,
or under-oil mounted with or without external disconnect
• High-voltage tap switch with operating handle in the terminating compartment
with one of the following tap ranges: four 2.5% taps above normal;
or four 2.5% taps below normal;
or two 2.5% taps above and two 2.5% taps below normal;
or taps at 13800/13200/12870/12540 for transformers with a
nominal high-voltage rating of 14400 (high-voltage taps may not be
available in combination with dual high-voltage ratings)
• Dual high-voltage switch with operating handle in the terminating compartment
(may not be available in combination with high-voltage tap switch)
• Interlaced low-voltage windings
• Drain valve with or without sampling device
• Temperature gauge
• Liquid level gauge
• Pressure/vacuum gauge
• Tank ground connectors
• Hold-down cleats
• Lifting bolts
• Custom stenciling and labeling
• Laser engraved stainless steel nameplate
• NEMA safety labels
• Seed-based dielectric fluid
• Canadian Standards Association (CSA) design standards
and other non-U. S. standards
• RUS accepted designs
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