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Used basic in USA

  • SQUARE D 9070EL2D9 INDUSTRIAL CONTROL

    SQUARE D 9070EL2D9 INDUSTRIAL CONTROL TRANSFORMER. 1-E9

    • Manufacturer: Square D

    Items are spares/engineering demo hookups that were pulled from an industrial working environment. We repair all types of industrial automation including AC Servo Drives, Servo Motors, Operator Interface Panels, ...

    $95 USD
    Duncan, SC
  • Square D 9070TF5D1 240V/480V Control

    Square D 9070TF5D1 240V/480V Control Transformer TF75D1 (9.3.3)

    • Manufacturer: Square D

    Square D 9070TF5D1 240V/480V Control Transformer New open Box*** Each*** Palmetto Automation Inc. of Duncan SC specializes in buying, selling, and repairing obsolete Used, Refurbished, and New industrial electron...

    $59 USD
    Duncan, SC
  • SquareD 250SV1B GP Transformer 60Hz

    SquareD 250SV1B GP Transformer 60Hz Pri 240/480 Sec 120/240 (4D–29)

    • Manufacturer: Square D

    SquareD 250SV1B GP Transformer 60Hz Pri 240/480 Sec 120/240 new open box – spare part from a project – seated on the shelf for a long time EACH** Palmetto Automation Inc. of Duncan SC specializes in buying, selli...

    $110 USD
    Duncan, SC
  • Square D 9070TF300D1 Transformer. Loc4D-24

    Square D 9070TF300D1 Transformer. Loc4D-24

    • Manufacturer: Square D

    Square D 9070TF300D1 Transformer. Loc4D-24* We repair all types of industrial automation including AC Servo Drives, Servo Motors, Operator Interface Panels, PLC's, Sensors, Process Controls and Timers. Palm...

    $291 USD
    Duncan, SC
  • Square D 9070TF50D23 Control Transformer

    Square D 9070TF50D23 Control Transformer 0.05 kVA Quick-Connect Term Mod. 4E-3

    • Manufacturer: Square D

    Square D 9070TF50D23 Control Transformer 0.50 KVA PRI 120/240 VAC 24 VAC SEC. OEM spares from a brewery/ bottling plant maintenance room's canceled expansion project tool crib. We repair all types of industri...

    $70 USD
    Duncan, SC

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.