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.
Howard Industries manufactures a complete line of transformers, all designed with increased margins of safety and reliability. Contact your distributor or factory representative for availability of other kVA sizes, voltage ratings, features, accessories and design standards not listed.
Talk to us about filling a custom order that best fits your needs.
| 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) |
| Meets or exceeds current IEEE, NEMA, RUS, and DOE 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 |
| 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 | |
| • Four 2.5% taps below normal | |
| • Two 2.5% taps above and two 2.5% taps below normal | |
| • Taps at 13800/13200/12870/12540 for transformers with a nominal high voltage 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 high voltage 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 | |
| Amorphous Metal Core | |
| Seed-based 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 |
