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Dry Type Transformer VPI Type

Dry Type Transformer VPI Type

Dry Type Transformer VPI Type

Vacuum pressure impregnated transformer (VPI) is a type of dry type transformer that uses class H polyester resin to impregnate its windings under vacuum and pressure. This eliminates any air gaps or voids in the insulation, enhancing its mechanical strength, dielectric strength, and thermal stability.

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A VPI is suitable for outdoor installations, seismic events, and temperature fluctuations because it has a robust construction, a moisture-resistant enclosure, and a low thermal expansion coefficient. It also has easy maintenance, low fire risk, and high resistance to short circuit current.

Applications:

Environmentally sentitive area: dry type transformer use air as the insulation medium, no oil leakage risks, 

Fire-risk area: such as indoor substations, underground substations, hospitals, schools, hotels, shopping malls, etc.

Oil&gas industry: dry type transformer non-flammable, no danger of combustion and explosion

Main Features and Benefits:

  • Fire resistant /Self-extinguishing
  • Environmental friendly
  • Maintenance free
  • Cost-effective option than CRT (cast resin type)
  • Lower installation costs

General Specifications

Power 100kVA-10MVA
Primary Voltage(kV) 4.16, 6, 12.47, 13.2, 15, 20, 24.94, OR OTHERS
Secondary Voltage(V) 208, 240, 400, 480, 2400, 4160 OR OTHERS
Standards IEC60076-1-5; IEEE C57.12.01 
Cooling Type AN/AF
Accessories Temperature controller, Cooling fans

Enclosure Options:

  • Stainless-steel 
  • Mild steel 
  • NEMA 3R or others
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