/Dry-Type Transformers/
Heavy-Duty Liquid-Immersed Power Distribution.
Dry-type transformers from Magnetics Design deliver ultimate environmental safety and structural reliability. Engineered with premium solid-dielectric insulation, these units eliminate fire hazards and fluid leaks—making them the ideal choice for high-density commercial, indoor industrial, and sensitive utility installations.
Same-Day Quotes
3-Year Warranty
USA-Made Options
/The Magnetics Design Advantage/
Engineered for maximum environmental safety and durability.
Operating severe electrical loads generates localized core heat. Our liquid-immersed transformers utilize premium-grade mineral oil or bio-degradable ester fluids paired with robust mechanical clamping to counter thermal fatigue and sudden short-circuit dynamics.
Up to XXX MVA
Indoor / Outdoor
Oil & Dry Type
01
Superior Heat Sinking
Liquid-immersion delivers far greater thermal cooling capacity than dry-type insulation, preventing hot spots and allowing safe short-term overloads.
02
Self-Healing Insulation
Unlike solid dielectrics, high-grade transformer oils provide self-healing liquid insulation that completely recovers properties after minor voltage surges.
03
Environmental Sealing
Completely sealed tank geometries prevent internal moisture ingestion, guarding the active core-and-coil assembly from outdoor corrosive ambient air.
04
Extended Service Life
No fluid samples to draw, no dissolved gas analysis (DGA) tests required—just standard, periodic dust removal for decades of operation.
Standards & Specifications
/Standards & Specifications/
Engineered for High-Performance Power Systems
Magnetics Design oil-filled transformers are mathematically calculated, built, and evaluated in strict compliance with IEEE C57.12.00 (Standard General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers) along with international IEC 60076 regulations.
Whether configuring a network pad-mounted layout, a primary electrical substation infrastructure, or specialized industrial heavy-machinery distribution, our team based in Illinois designs optimized magnetic solutions customized for your exact field conditions.
/Product Scope/
Base Rating
300–100,000 kVA
Voltage Class
Up to 115 kV
Configurations
ONAN, ONAF, KNAN, KNAF
Insulation Systems
Mineral Oil / FR3 Bio-Ester
Test Standard
IEEE C57.12.00 / IEC 60076
Specify your oil-filled requirements.
Provide your target kVA size, primary line-side voltage, secondary distribution voltage, fluid preference, and outdoor placement rules. Our engineering sales group in Illinois will rapidly evaluate your documentation and respond with an uncompromised project proposal.
What Our Clients Say
by Magnetics Design substations.
Advanced transformer solutions designed to improve power quality, reduce harmonics, and maximize system performance.
We were struggling with severe harmonic distortion on our main drive lineup. Magnetics Design engineered a 24-pulse phase shifting unit that dropped our THD well below IEEE 519 limits.
Brian John
My Client
Magnetics Design turned around a quote for a custom 18-pulse transformer the same day. The build quality was exceptional, and it arrived right on schedule for our shutdown window.
Felix Chou
My Client
The VFD isolation properties on these units are bulletproof. We source all our specialty phase shift transformers from the Magnetics Design team because they get the specs right the first time.
Anna Choux
My Client
Questions engineers ask
What are the key cooling classes available for liquid-immersed transformers?
We provide multiple standard configurations depending on design demands: ONAN (Oil Natural Air Natural) relies entirely on fluid convection and ambient airflow; ONAF (Oil Natural Air Forced) adds specialized external cooling fans to boost capacity. For installations prioritizing fire safety, we engineer KNAN and KNAF systems using high-flashpoint ester fluids like Cargill FR3.
What are the primary benefits of choosing oil-filled over dry-type configurations?
Oil-filled transformers offer superior thermal capacity, a smaller overall structural physical footprint at high-voltage ratings, higher energy efficiency ratings, and robust protection from outdoor weather. Additionally, liquid dielectrics possess self-healing insulation parameters that minimize localized failures during high-voltage grid switching surges.
What typical lead times and logistics arrangements can I expect?
Lead times correspond directly to your choice between a pre-engineered stock frame or a fully customized engineered-to-order project. We pride ourselves on rapid engineering responses and can often deliver comprehensive proposals on the exact same business day. Finished equipment ships safely coordinated with specialized transport fleets straight from our factories to your concrete pad.
Are Magnetics Design liquid-insulated transformers built inside the United States?
Yes. Magnetics Design operates as an Illinois-based manufacturer. We build and technically evaluate all of our equipment domestically, easily allowing our clients to fulfill strict federal procurement frameworks such as the Buy American Act (BAA). Ensure you communicate these compliance demands to your designated project engineer.
What kind of preventive maintenance do these transformers require?
To preserve a 30+ year lifespan, we recommend basic routine testing, including visual gauge inspections, gasket verification, and annual oil sampling for Dissolved Gas Analysis (DGA). DGA serves as an early-warning system that detects internal tracking or insulation breakdown without taking the transformer offline. Every unit we sell is fully supported by our comprehensive 3-year factory warranty.