Medium Voltage Dry-Type Transformer

Unit substation dry-type transformers are designed for medium voltage power distribution where liquid-cooling is not an option, such as indoor power distribution line-ups, or outdoor areas with environmental concerns.

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the core of a medium voltage dry type transformer

    Maddox medium voltage dry-types are designed, built, and tested in accordance with the highest industry standards including NEMA, ANSI C.57, DOE, and IEEE as applicable. They can be configured for general purpose and unit substation applications and are customizable to give you greater control over your unit’s function and safety.

    Product Scope

  • 300 kVA - 5,000 kVA
  • Up to 35,000v

Technical Specs

Medium voltage dry type transformer core and coil

Standard specs

  • Self-cooled (AA)
  • Aluminum windings
  • Voltage adjustment taps
  • Impedance 5.75% (±7.5%)
  • NEMA 1 indoor enclosure
  • High-grade silicon-steel core
  • Ground pads/lugs
  • 150 degree C rise
  • VPI windings
  • Stub-up/down bus
  • Stainless steel hardware

Optional upgrades

  • Forced air cooling system (AA/FA)
  • Copper windings
  • NEMA 3R outdoor enclosure
  • Lightning arresters
  • 80C or 115C degree rise
  • Solar step-up design
  • Electrostatic shielding
  • K-rated design
  • Cast-coil windings
  • Bus to ends
  • Transition section/terminal chambers
  • Temperature monitoring system
  • Primary load-interrupter switch
  • Double-thick varnish for corruption protection
Get Started
We make it easy to get a quote and order a transformer. Follow the steps below to get started.

Request a Quote

Call or fill out the form below to get a quote. Most quotes are turned around the same or next-day.

Place your order

Send us a purchase order, or give us a credit card number, and your dedicated customer service rep will send you an order confirmation and answer any questions you may have.

Receive your transformer

We’ll handle all transportation and logistics. Maddox has the shortest lead times in the industry so you can get the power on when you need it.

"We ordered transformers to use for our industrial equipment applications due to market shortages for our standard stepdown transformers. Delivery was incredibly quick and products look and operate without issue. Priced very well in comparison to other outlets - very happy to utilize Maddox in the future for our continued needs."

Todd Griffieth, ops manager

"I have purchased dozens of Maddox transformers, both low voltage dry-types and large reconditioned medium voltage units. Always great service and quality builds, with faster than industry standard lead-times."

Eric Raybould, distributor

"Quick delivery with helpful friendly staff. Great service and highly recommended. A great company to work with on all your transformer needs."

Austin Spiegel, project manager

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Medium voltage dry type carried by a forklift