Small Power Open Substation

 
Howard Industries liquid-filled substation transformers are designed for a wide range of commercial, industrial and utility applications. They are an ideal choice for manufacturing facilities, chemical plants, refineries, office buildings, schools, hospitals, restaurants, banks, Internet service facilities, and shopping centers. As a result of our exceptionally high standards for desing and manufacturing, our customers can be assured of substation transformer products that meet the most exacting requirements for safety, reliability, functionality, and economy.

Four basic substation configurations are available. Primary open substations have cover mounted high-voltage and low-voltage bushings and have low-voltage ratings above 1.0 kV. Secondary open substations have cover mounted high-voltage and lowvoltage bushings and have low-voltage ratings of 1.0 kV or less. Primary unit substations have sidewall mounted high-voltage or low-voltage bushings (or both), have low-voltage ratings above 1.0 kV, and can be supplied with mounting provisions for mechanical and electrical interconnection with high-voltage and low-voltage switchgear. Secondary unit substations have sidewall mounted high-voltage or lowvoltage bushings (or both), have low-voltage ratings of 1.0 kV or less, and can be supplied with mounting provisions for mechanical and electrical interconnection with high-voltage and low-voltage switchgear.

All of these substation configurations can be designed for indoor or outdoor use. Our experienced design team can provide customized designs for new applications or for jobs requiring replacement of existing transformer equipment. A wide range of features and accessories are available to satisfy almost any requirement.

Click to enlarge
 
Ratings
Primary Substations
• KVA Ratings (65 C Rise, Self Cooled, OA)
  225, 300, 500, 750, 1000, 1500, 2000, 2500, 3000, 3500, 5000, 7500, 10000
• High-Voltage Ratings (Delta or Y)
  2400 through 69000 (through 350 kV BIL)
  (Some high-voltage and kVA combinations are not available.
  Contact factory for details.)
• Low-Voltage Ratings (Delta or Y)
  120 through 8400 or 14400Y (through 110 kV BIL)
  (Some low-voltage ratings are not available for all kVA sizes.
  Some low-voltage and high-voltage rating combinations are not available.
  Contact factory for details.)

Secondary Substations
• KVA Ratings (65 C Rise, Self Cooled, OA)
  112.5, 150, 225, 300, 500, 750, 1000, 1500, 2000, 2500, 3000
• High-Voltage Ratings (Delta or Wye)
  2400 through 69000 (through 350 kV BIL)
  (Some high-voltage and kVA combinations are not available.
  Contact factory for details.)
• Low-Voltage Ratings (Delta or Wye)
  120 through 480 (30 kV BIL)
  (Low-voltage ratings of 208Y / 120 and 240 Delta
  are available through 1000 kVA only.)

 
Standard Features
• Meets or exceeds latest ANSI and NEMA standards
• Meets DOE efficiency standards (units covered by the DOE final rule and
   manufactured beginning January 1, 2010)
• 60 Hertz operation
• 65° C average temperature rise (self-cooled, OA rating)
• Thermally upgraded insulation system
• Core / coil optimized for lowest owning cost or lowest purchase price
• Four 2 1/2 percent full-capacity high-voltage taps (two above and two below
  rated voltage with externally operated switch for de-energized operation)
  (may not be available on units with series multiple high-voltage ratings)
• Side-wall or cover-mounted high-voltage bushings
  (must be cover mounted for ratings above 34.4 kV)
• Side-wall or cover-mounted low-voltage bushings
• Welded mild steel tank construction
• Corrosion-resistant hardware
• Permanently attached cooling panels
  (when panels are necessary for proper cooling)
• Bolted hand-hole access to internal tank compartment
• Lifting hooks for balanced lifting
• Bottom drain valve with filter press connection
• Provision for top filter press connection
• Tank grounding pad
• Base suitable for jacking or rolling
• Full-height flange for side-mounted high-voltage bushings
  (high-voltage ratings of 34.4 kV and below only)
• Full-height flange for side-mounted low-voltage bushings
• Flexible conduit for control wiring
• Aluminum diagrammatic nameplate, laser engraved
• Electrostatically applied powder paint finish with polyurethane topcoat,
  ANSI 61 light gray
• Mineral oil dielectric coolant

 
Optional Features
• 50 Hertz operation
• 55° / 65° C average temperature rise
• Delta / Wye high-voltage windings with externally operated switch
  for de-energized operation (150 kV BIL and below only)
• Series multiple high-voltage windings with externally operated switch
  for de-energized operation (150 kV BIL and below only)
• Non-standard high-voltage taps with externally operated high-voltage switch
  for de-energized operation
  (may not be available on units with series multiple high-voltage ratings)
• Keyed lock for externally operated switches
• Electrostatic shields
• Full height air terminal chamber
• Secondary bus duct throat (instead of full-height flange)
• Air terminal box
• Outdoor throat adapter (for connection to switchgear in outdoor applications)
• Cover mounted buss duct throat
• External fuses
• High-voltage surge arresters
• Low-voltage surge arresters
• Internally-mounted bushing current transformer
• Neutral grounding resistor
• Provisions for future forced-air cooling system
• Forced-air cooling system
• Control power transformer
• Rigid conduit for control wiring
• Stainless steel tank construction
• Removable cooling panels
• Skid mounting
• Top filter press valve
• Tank ground connector
• Pressure / vacuum gauge (with or without alarm contacts)
• Liquid temperature gauge (with or without alarm contacts)
• Liquid level gauge (with or without alarm contacts)
• Cover-mounted pressure relief device (with or without alarm contacts)
• Rapid pressure rise relay
• Dial-type hot spot indicator
• Shock indicator for shipment
• Custom stenciling and labeling
• Stainless steel diagrammatic nameplate, laser engraved
• Special topcoat color (ANSI 70, ANSI 49, ANSI 24)
• Beta, silicone, or seed-based vegetable dielectric coolant
 
 
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