Transformer Repair Process
Maddox makes it easy to repair your transformer with our simple three-step process.
Extend Lifespan. Faster.
Transformer Repair & Rewinding
Maddox provides repair, rewind, and maintenance services for padmount, substation, and dry-type transformers located anywhere in North America.
Transformer Repair Services
Our technicians use state-of-the-art testing and fabrication equipment to deliver a full range of inspections, tests, and maintenance services that keep your transformer in top condition.
Fast Evaluations
Inspection report delivered in days
3 Year Warranty
Same protection as new units
800+ 5-Star Reviews
Over 28,000 satisfied customers
Maddox Repairs Transformers Fast & Hassle-Free
Don’t replace what Maddox can repair. Our straightforward repair process gives new life to aging and failing transformers, saving you time and money.
Transformer Repair Process
Comprehensive Evaluation
After a full battery of electrical and oil tests, our engineers will determine the repairs required and provide a formal quote.
Expert Repair
Our skilled technicians will follow the repair plan developed by engineering, restoring your transformer to like-new condition.
Final Testing & Delivery
Our quality control team will run final electrical tests and a 45-point review to ensure your transformer meets top performance standards.
Thousands of Units In-Stock
Transformers available for same-day delivery.
Expedited Production Slots
Build-to-spec with short lead times.
Extensive Customizations
Manufacturing capabilities for any design.
Instant Access to Experts
Helpful transformer people, not call centers.
Transformer Rewind Service
Maddox rewinds coils for dry-type and oil-filled transformers with severely damaged windings.
Expert Transformer Rewinding
Maddox offers coil replacement and rewinding for oil-filled and dry-type transformers that have experienced damage or failure from overheating, degraded insulation, internal faults, or shorting. Our rewind shop is located near Cincinnati, Ohio and services transformers nationwide.
Your Transformer Will Work (and Look) Like New Again
Maddox transformers look great after repair, but the process goes far beyond a clean finish. Every unit is rigorously tested to the highest industry standards, including NEMA, ANSI, C57, DOE, and IEEE as applicable, before final shipment.
They Needed Power Restored. Maddox Delivered Fast.
When a failed substation was costing farmers $30,000 an hour, they trusted Maddox to repair their transformer.
Get a Quote in Minutes
Fill out the form and we will get back to you as soon as possible. Our average response time during business hours is 30 minutes.
State-of-the-Art Repair Facilities
Maddox repair centers can handle all your industrial transformer repairs—from padmounts and medium voltage dry-types (300–10,000 kVA) to substations weighing 40 tons.
Transformer Repair Center Locations
Based in Greer, SC, Maddox operates nationwide with additional facilities in Ohio and Washington equipped to repair transformers of every size.
Frequently Asked Questions
Lead Time
What is the average lead time for a Maddox dry-type transformer?
In-stock dry-type transformers ship in 3–5 days. Lead times for custom units will vary. Request a quote here for spec-specific lead times.
Warranty
What is Maddox’s standard warranty for dry-type transformers?
Maddox offers the industry’s best warranty for dry-type transformers, covering new and used units for 5 years. Find Maddox’s full dry-type warranty here.
American Made
Are Maddox dry-type transformers BABA compliant?
Maddox can build your dry-types to meet “build America, Buy America” requirements. Ask for BABA compliance in your quote and learn more about BABA here.
Rentals
Can I rent a dry-type transformer from Maddox?
Yes, you can rent a dry-type from Maddox for temporary power. Find rental options here.
New vs Used
Does Maddox sell new and used dry-type transformers?
Yes, Maddox sells both new and used dry-type transformers, so you can meet the budget and deadline of any project. Shop new and used options here.
Customizations
Can Maddox build a custom dry-type transformer to meet my spec?
Yes, Maddox builds custom dry-type transformers to spec with some of the fastest lead times in the industry. Request a quote here to get pricing and lead times.
Shipping
How is shipping arranged for Maddox’s dry-type transformers?
Maddox ships dry-type transformers anywhere in North America, handling all logistics at no additional charge. Request a quote here to get specific pricing and lead times.
Autotransformers
Can I use an autotransformer for my application?
Autotransformers are cost-effective substitutes for general purpose transformers in cases when isolation from the supply line isn’t necessary. Learn more about autotransformer applications here.
Isolation Transformers
What is the difference between isolation and drive-isolation transformers?
Drive isolation transformers feature overload capacity for applications with motor drives (VFDs or VSDs). Learn more about drive isolation transformers here.
Y Service Voltage
Does my transformer need a wye primary if my service voltage is wye?
While the answer is often no, we recommend consulting a transformer expert prior to purchase. Request a quote here to speak with a Maddox representative.
