SUBSTATION TRANSFORMERS

​Product Scope

• 500 kVA - 20 MVA
• ​Voltages through 138kV

​Maddox Transformer's liquid-filled substation transformers are an excellent choice for any commercial or industrial distribution system.

All designs are UL listed*, and can be supplied with full, or partial length air terminal chambers to make installation in your lineup easy. Maddox transformers are designed, built, remanufactured and tested in accordance with industry standards including NEMA,  ANSI C.57,  DOE, and IEEE as applicable.  

With thousands of new, and reconditioned units in stock and ready-to-ship, Maddox stands ready to meet your transformer need(s). 

What are you looking for? Call our toll-free number 1-800-270-2011 or fill out the RFQ form on this page!

*Some reconditioned units are not UL listed.

TECHNICHAL SPECIFICATIONS

STANDARD FEATURES

• Reinforced Steel Plate Tank
• High-Grade Silicone-Steel Core
• Non-PCB Insulating Fluid
• Externally Clamped High and Low Voltage Bushings
• NEMA Two-Hole Ground Pad
• Stainless Steel Diagrammatic Nameplate
• Base Suitable for Rolling or Skidding
• Welded Cover with Handhole
• No-Load Tap Changer

​OPTIONAL FEATURES

• Bio-degradable Envirotemp™ FR3
• 55/65 Degree C Temperature Rise
• Air Terminal Chambers
• ​Transition Sections
• And many more! Contact us for more info.

​Included Gauges & Accessories

• Pressure Relief Device
• Pressure Vacuum Gauge
• Liquid Temp Gauge
• Liquid Level Gauge
• Drain and Sample Valve​​​​
  ​

Common Customizations

• Gauges with Contacts
• Full Fan Package
• HV Switch Close-coupled to Unit
• Bolt-on Radiators
• Skid-mounted Design
  
• Neutral Grounding Resistor
  

10 MVA substation transformer