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.
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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
Transformer Types
What types of transformers does Maddox repair nationwide?
We provide national transformer repair services for padmount transformers, substation transformers, and medium voltage dry-type transformers, including full rebuilds and rewinds.
Emergency Repairs
Does Maddox offer emergency transformer repair services?
Yes, we provide emergency transformer repair services nationwide to restore critical power systems quickly and minimize downtime for utilities and industrial operations.
Turnaround Time
How fast is Maddox’s transformer repair turnaround time?
Most transformer repairs are completed in a few weeks. Submit an RFQ to receive a specific timeframe for your transformer repair.
Transformer Repair Process
What is included in Maddox’s transformer repair process?
Our process includes inspection, teardown, core and coil repair or rewinding, oil processing (where applicable), new gaskets, component replacement, reassembly, and final ANSI C.57 electrical testing.
Rewinding Services
Does Maddox provide transformer rewinding services?
Yes, we perform full transformer rewinds for damaged or failed windings, restoring electrical performance and extending transformer service life.
Testing Standards
What testing standards do Maddox repaired transformers meet?
All repaired transformers are tested in a full ANSI C.57 electrical test lab to ensure compliance with industry standards for safety, efficiency, and performance.
PEARL Certification
Are Maddox’s transformer repair services PEARL certified?
Yes, our process is PEARL certified, ensuring consistent quality standards, safety compliance, and best practices for transformer repair and remanufacturing.
Power Transformers
What makes Maddox’s transformer repair facilities capable of large-scale projects?
Our facilities include 40-ton crane capacity, 31,000 lb forklifts, large indoor/outdoor storage spaces, and a full fabrication shop to handle heavy and complex transformer repairs.
Oil Processing
Does Maddox perform transformer oil processing and dehydration in-house?
Yes, we use vacuum processing oil dehydrators with up to 1,600 GPH capacity to remove moisture, gases, and contaminants from transformer oil.
Service Area
Why choose Maddox for national transformer repair services?
We combine PEARL-certified quality, ANSI C.57 testing, emergency response capability, and full in-house repair, rewind, and fabrication services to deliver fast, reliable transformer restoration nationwide.
