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Howard Industries liquid-filled three-phase pad-mounted transformers are an excellent choice
for any commercial or industrial underground distribution system.
Typical applications include manufacturing facilities, refineries, office buildings, schools,
hospitals, restaurants, warehouses, and retail stores.
All Howard Industries transformers are designed, built, and tested in an ISO-9001 certified
facility in accordance with applicable industry standards.
All designs feature fully enclosed tamper resistant terminal compartments and can be supplied
with dead-front or live-front construction, for loop or radial feed applications.
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| Ratings |
• KVA Ratings (65° Rise, ONAN)
45, 75, 112.5, 150, 225, 300, 500, 750, 1000, 1500, 2000,
2500, 3000, 3750, 5000, 7000, 7500, 10000
• High-Voltage Ratings (Delta or Wye)
2400 through 46000 (through 200 kV BIL)
• Low-Voltage Ratings (Delta or Wye)
120 through 8600 or 14400Y (through 110 kV BIL)
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| Standard Features |
• Meets or exceeds current ANSI, NEMA and RUS standards as applicable
• Full compliance with ANSI C57.12.28 enclosure integrity standards
• Externally clamped porcelain high-voltage bushings with eyebolt connectors
• Externally clamped low-voltage bushings with threaded stud for full-load current
through 1400 Amps, or externally clamped one-piece NEMA spade bushings
for full-load current above 1400 Amps
• Removable neutral ground strap in low-voltage compartment
(for wye connected low-voltage ratings only)
• Removable high-voltage/low-voltage neutral link, internally mounted
and accessible through tamper-resistant hand hole (Wye-Wye units only)
• Lifting provisions
• Jacking/rolling provisions
• Removable terminal compartment and bottom sill and removable doors
with stainless steel hinges
• Bolted hand hole on oil compartment top with tamper-resistant security cover
• Three-point door latching system with recessed interlocking
pentahead security bolt and padlock provision
• Tank ground provisions
• Mild steel tank and terminal compartment construction
• Mild steel high-voltage/low-voltage compartment barrier
• Domed top surfaces on
tank and terminal
compartment to prevent
water retention
• Recessed tank compartment
bottom
• Electrostatically applied powder paint finish with olive-green polyurethane
top coat (Munsell 7GY 3.29/1.5) provides excellent resistance to chipping, fading,
abrasion, and corrosion
• Oil fill/oil level plug
• Automatic pressure relief
device mounted in
terminal compartment
• Oil drain valve with
sampling device
• Electrical grade mineral
oil insulation fluid with
oxidation inhibitor
• Laser engraved anodized
aluminum nameplate
• Decal bushing
designations
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| Optional Features |
• Loadbreak high-voltage bushing inserts or externally clamped integral
(one piece) high voltage bushings for dead-front applications
• Low-voltage connectors, including various screw-on or slip-on types
• Insulated interphase barriers
• Lightning arrester mounting provisions
• Externally operable nonloadbreak high-voltage tap switch 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 highvoltage rating of 14400 (may not be available in combination
with dual high-voltage switch)
• Externally operable dual high-voltage switch (may not be available
in combination with highvoltage tap switch)
• Fault indicators or fault indicator mounting provisions only
• Internal expulsion fuses, alone or in combination with internal
backup current limiting fuses
• Draw-out expulsion fuses with isolation links, alone or in combination
with internal backup current limiting fuses
• Draw-out full-range current limiting fuses in dry-well canisters;
with or without interlocking loadbreak switch
• Internal full-range current limiting fuses
• Arc Strangler® fused disconnect switches
• MOV surge arresters, including under-oil or panel-mounted types
• Drip shields for use with draw-out expulsion fuses
• Externally operable two-position or four-position high-voltage loadbreak switch
• Internal low-voltage circuit breaker with external operating handle,
or external molded case low-voltage circuit breakers
• High capacity pressure relief device mounted on tank cover
• Drain valve with sampling device
• Total stainless steel or hybrid (mild steel/ stainless steel) construction
• Temporary access service
provision (conduit hole)
• Hexhead security bolt
(pentahead standard)
• External Watt-hour meter
base with or without
meter, or mounting
provisions
only
• External potential
transformers
• External current
transformers
• Tank ground connectors
• Cover mounted throat for
bus duct connection
• Dial type temperature
gauge
• Dial type liquid level
gauge
• Dial type pressure/
vacuum gauge
• Cooling fans or fan
mounting provisions only
• Beta, silicone or seedbased
vegetable oil
insulation fluid
• Laser engraved stainless
steel nameplate
(aluminum standard)
• Custom stenciling or
labeling
• NEMA safety labels
• Compliance with
Canadian Standards
Association (CSA)
standards
or other non-
U.S. standards
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