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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.
An oil sample and dissolved gas analysis (DGA) detects contaminants, moisture, and early signs of internal issues before they lead to catastrophic failure.
Damaged or degraded windings are carefully repaired or rewound to restore performance and extend the life of your transformer.
All sealed surfaces receive new gaskets to prevent oil leaking, protect internal components, and maintain a proper seal.
Structural damage, leaks, and corrosion are addressed to ensure the transformer tank remains secure, sealed, and fully functional.
Surfaces are cleaned, treated, and repainted to protect against corrosion and keep your transformer looking and performing like new.
Transformers undergo a comprehensive visual inspection, as well as diagnostic electrical and oil testing to ensure normal operation.
When it is not advisable to repair or rewind a transformer’s core and coil, Maddox can provide a full replacement.
Damaged or failed parts—such as bushings, gauges, and tap changers—are removed and replaced to restore the transformer’s performance.
Don’t replace what Maddox can repair. Our straightforward repair process gives new life to aging and failing transformers, saving you time and money.
Fast Evaluations
Inspection report delivered in days
3 Year Warranty
Same protection as new units
800+ 5-Star Reviews
Over 28,000 satisfied customers
Transformer Repair Process
Maddox makes it easy to repair your transformer with our simple three-step 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.
Transformer Rewind Service
Maddox rewinds coils for dry-type and oil-filled transformers with severely damaged windings.
Expert Transformer Rewinding
Experienced technicians restore damaged windings, insulation, internal faults, and shorted coils.
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 before final shipment.
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 handle padmounts, substations, and medium-voltage dry-types up to 160,000 kVA.
Full ANSI C.57 Electrical Test Lab
Comprehensive electrical testing and quality verification to industry standards.
10x10 Core & Coil Drying Oven
Controlled drying capacity for dependable insulation and winding restoration.
40 Ton Bridge Crane Capacity
Heavy lifting capacity for large transformer repair projects.
Full Fabrication Shop
In-house tank, component, and structural repairs.
14x14 Paint Booth w/ Crane Access
Protected finishing for a durable, like-new exterior.
31,000 Lb. Forklifts
On-site material handling for large and complex units.
45 Acres Outdoor, 175,000 Sq. Ft. Indoor
Space to stage, store, and service transformer projects at scale.
Fully Stocked Components Warehouses
Common replacement parts on hand to shorten turnaround time.
200,000 Gallons of Transformer Fluid
Transformer fluid inventory ready for repair and processing work.
Transformer Repair Center Locations
Battle Ground, WA
Repair support for the Pacific Northwest and western North America.
Batavia, OH
Repair support for the Midwest and surrounding markets.
Greer, SC
Repair support for the Southeast and national projects.
Simpsonville, SC
Additional repair capacity for fast nationwide service.
Frequently Asked Questions
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.