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Used Dongan Power Transformers in Ohio, USA

  • DONGAN,33-025,TRANSFORMER NOS

    DONGAN,33-025,TRANSFORMER NOS

    • Manufacturer: Dongan

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $45 USD
    Galion, OH
  • DONGAN,53-05,TRANSFORMER 50 VA NOS

    DONGAN,53-05,TRANSFORMER 50 VA NOS

    • Manufacturer: Dongan

    DONGAN,53-05,TRANSFORMER 50 VA NOS What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included ...

    $60 USD
    Galion, OH
  • Dongan,36-05-N,Transformer .050 KVA 60 HZ

    Dongan,36-05-N,Transformer .050 KVA 60 HZ

    • Manufacturer: Dongan

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $20 USD
    Galion, OH
  • Dongan,85-3045SH,Transformer

    Dongan,85-3045SH,Transformer

    • Manufacturer: Dongan

    Used and in good condition. Please see pictures for details and condition. You will receive what’s in the pictures. If we have multiples of the same item, the pictures may differ. Please review the pictures to ma...

    $170 USD
    Galion, OH
  • Dongan,35-M015,120/240V .15KVA Transformer

    Dongan,35-M015,120/240V .15KVA Transformer

    • Manufacturer: Dongan

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $24 USD
    Galion, OH
  • Dongan,IC-1000-107,Transformer kVA 1 50/60 HZ

    Dongan,IC-1000-107,Transformer kVA 1 50/60 HZ

    • Manufacturer: Dongan

    Used. Part was pulled from operation upon factory shutdown. Please see pictures for details and condition. Please check out our eBay store to view additional listings. We hope to deal with you very soon! Room 3 S...

    $52 USD
    Galion, OH
  • DONGAN,N10-LF3X-NB,INDUSTRIAL IGNITION TRANSFORMER 480V 60HZ

    DONGAN,N10-LF3X-NB,INDUSTRIAL IGNITION TRANSFORMER 480V 60HZ NEW

    • Manufacturer: Dongan

    New in original box. Please see pictures for details and condition. You will receive what’s in the pictures. If we have multiples of the same item, the pictures may differ. Please review the pictures to make sure...

    $250 USD
    Galion, OH

Overview

Power transformers transfer electrical energy between voltage levels for utilities, substations, and large industrial plants. These heavy, high-capacity units come in oil-filled or dry-type designs, with cooling classes (ONAN, ONAF, etc.), on-load tap changers, bushings and protection gear. Buyers must match voltage class, impedance, capacity (kVA/MVA), and cooling to system needs, and plan for foundation, handling, transport and commissioning.

FAQ

What specifications should I check when buying a used power transformer?

Confirm voltage ratios, kVA/MVA rating, impedance, cooling type, phase configuration, on-load tap changer condition, bushing types and insulation class, and recent test reports (DGA, insulation resistance, turns ratio).

How do I verify a used transformer's condition before purchase?

Request factory and maintenance records, Dissolved Gas Analysis (DGA), insulation resistance, power factor tests, sweep-frequency response (SFRA) and a visual inspection report for leaks, rust and bushing integrity.

What are the key shipping considerations for heavy power transformers?

Plan for specialized heavy-haul transport, load lifting equipment, route permits, weight/axle limits, skidding or cradling, draining oil if required by regulations, and coordination with local authorities for oversized loads.

What site preparations are needed before delivery and installation?

Prepare a level, rated foundation or skid with proper anchoring, ensure crane access and pad capacity, verify cable entry, grounding, oil containment for liquid-filled units, and arrange for qualified rigging and electrical commissioning crews.

What ongoing maintenance keeps a power transformer reliable?

Perform regular DGA, insulation resistance and oil quality tests, thermographic inspections, tap changer maintenance, bushing checks, cooling system inspections and timely repairs. Follow manufacturer intervals and keep detailed service records.