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Transformer Sales


Greenville Transformers Company supplies the industrial, utility, and commercial communities with high-quality transformer units and systems. With more than 55 years of experience, our customers have come to rely on Greenville Transformer Company for matching their unique needs to the best possible product for their success. Choose from hundreds of new, surplus, and reconditioned units that are in-stock and ready to ship.

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Transformer Rental


Greenville Transformer Company is here to help you 24/7 for your entire electrical rental needs! A short list of the equipment that we provide includes.

  • All Types of Transformers – 5 to 10,000 kVA - 120 volt to 35,000 volt
  • Substation
  • Padmounts
  • Polemounts
  • Dry-Type
  • Multi-Tap
We Cater Primarily To:
  • Generator Distributors/Dealers
  • Equipment Rental Companies - Especially those specializing in power, pump, HVAC, and more...
  • Contractors
  • End Users
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Transformer Testing


The Power Transformer Subcommittee of the Institute of Electrical and Electronics Engineers, (IEEE), representing both manufactures and users, has established and documented standard transformer test procedures. These test procedures are described in the American National Standards Institute, (ANSI) Standard ANSI C57.12.90 for liquid filled transformers and C57.12.91 for dry type transformers. General requirements are documented in ANSI C57.12.00 and C57.12.01 respectively. Additional information is documented in the National Electrical Manufacturers' Association (NEMA) Standards Publication No. TR-1.

Our testing capabilities include:
  • Resistance (DLRO)
  • Ratio
  • Polarity and Phase Relation
  • No-load Losses
  • Excitation Current
  • Impedance Voltage
  • Load Losses
  • Induced Voltage
  • Insulation Resistance (Megger)
  • Oil Dielectric
  • Transformer Tank Pressure Test
  • Doble Power Factor
  • Up to 50 KV Hypot

*For further information on transformer testing, Greenville Transformer Company’s sales or design engineers can be contacted or reference can be made to the National Standards noted.

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Transformer Rewinds


Save and time and money with a coil rewind!

In certain cases, transformer inoperability is a result of a failed coil due to an external cause, such as a lightning strike, or moisture or some other contaminant in the tank. While the coil has failed, everything else is viable and can be reused, including the core, tank, head frame, and bushings.

In the event of a coil failure, Sunbelt fully inspects your transformer to determine winding material and to quote a cost. From there, our skilled technicians will:

  • Disassemble the coil
  • Reverse engineer to determine coil size, voltage, and kVA
  • Design, wind, and install the new coil
  • Perform a full electrical test
  • Recondition your transformer, including bushings, gauges, and cabinet down to a new coat of paint

Coil rewinds are more time-efficient, with lead times as quick as four to six weeks, compared to the 14 to 16 weeks it takes to build new. It also provides a more turnkey re-installation process with NO added work at your job site.

Coil rewind is also ideal for off-the-shelf retrofits.

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Field Testing


Not all repairs need to be done in-house. Greenville Transformer Company is within a day’s drive of most of our customer locations. We can complete several repairs at your jobsite, keeping your transformer in service and saving you money on rental fees, disassembly, and transportation.

Field repair services can include:
  • Leak repair and gasket replacement on Distribution and Power Class Units
  • Complete oil analysis and processing
  • Complete transformer testing
  • Custom buss modification and close coupling of gear
  • Component replacement:
  • Tap changers
  • Bushings
  • Gauges
  • Fans
  • Bay-o-net
  • Inserts
  • Etc.
  • Retrofilling of non-PCB units
  • Turnkey fitting:
  • Rigging
  • Testing
  • Installation
  • Disposal of old unit
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