Dry-Type Transformers

JST brings safety, reliability and satisfaction to all segments of the electrical industry. JST's innovative approach allows collaboration and growth. We innovate product solutions with our customers, together!

Cast Resin Transformers

Cast epoxy resin transformers are highest on the evolutionary scale of transformer design and offer the best combination of electrical and mechanical performance factors. The robust structure achieved by casting the windings in a solid shell of epoxy provides mechanical strength unsurpassed by any other transformer available on the market. Cast resin transformers offer safety, environmental and sustainability goals set forth by many industries.

Cast Resin
  • Environmentally friendly
  • Superior dielectric properties
  • Robust structure allows protection against damage due to electrical faults and heavy electrical surges
  • Compact design
  • Low or no maintenance, which usually consists of wiping off accumulated dirt and dust
  • Self-extinguishing insulation system
  • Can be used anywhere in all different types of environments
  • Can be used up to voltage levels in the 35kV class, basic impulse levels (BIL) to 200kV and partial discharge levels to 10 pico-coulombs and below.
  • Overload capable and fans offered for extra cooling
  • Lower installation costs
  • Phase shifting version
  • Water cooled options
  • Rectifier/Traction version
  • Marine
  • Secondary unit substation
  • Primary unit substation

VPI Transformers

VPI transformers are an excellent alternative in applications which call for an environmentally friendly, economical solution. They reduce flammability concerns, require less maintenance, and are less prone to contaminating the surrounding environment than liquid filled transformers avoiding the need for catch basins during construction.

  • Voltage: Up to 15 kV​
  • BIL: Up to 110kV
  • Ratings: Up to 14.5 MVA​
  • Enclosure NEMA 1, 12, 3R, 4 & 4X​
  • Rated power:  100kVA – 14.5 MVA​
  • High Voltage: 600V - 15kV
  • Typical High Voltages (kV): 2.3, 4.16, 8.7, 12.47,13.2, 13.8,15
  • Low Voltage: 0.208, 0.24, 0.48, 2.4, 4.16

Need Help with Solutions? We're the Experts!