Pennsylvania Transformer Technology, LLC

PTT Delivers Power Transformer Solutions From
5 MVA to 750 MVA through 500 kV

HV Power Transformer 40 MVA, 3-Phase
Built to Standards, Tailored to Your Needs

Pennsylvania Transformer Technology, LLC (PTT), a Quanta Services company, is a U.S.-owned leader in designing and assembling oil-filled power transformers for the U.S. and Canadian markets. With roots dating back to 1929, PTT delivers engineered solutions from 5 MVA to 750 MVA through 500 kV, built for performance, reliability, and longevity.

PTT’s power transformers are engineered to perform under the toughest grid conditions. Our team partners with utilities and industrial clients to deliver customized solutions that balance efficiency, reliability, and long-term value—all PTT production facilities located in the USA.

Check Out Key Power Transformer Projects

345 KV
TRANSFORMER

The 345 kV high-voltage power transformer from PTT delivers exceptional reliability and performance, offering up to 150 MVA of capacity, copper windings, dual-stage forced-air cooling, and over 99.6% efficiency for heavy-duty substation and transmission applications.

345KV 

138 KV
TRANSFORMER

The 138 kV high-voltage power transformer from PTT delivers elite-tier utility performance — offering 105/140/175 MVA capacity, dual-stage ONAN/ONAF cooling, ±10% voltage regulation via 16 tap steps, and up to 99.77% efficiency — all assembled in the USA to ISO 9001 and ANSI/IEEE standards.

138KV

40 MVA
TRANSFORMER

The 40 MVA, 69/13.8 kV three-phase power transformer from PTT pairs precision copper-wound engineering with advanced ONAN/ONAF/OFAF cooling, automatic load tap changing and full ANSI/IEEE compliance—delivering robust, efficient and dependable power for demanding substation environments.

40MVA
​MVA Ratings

Assembled With Pride and Skill in The USA

Cooling System Options

Decades of Proven Engineering Expertise & Success

Voltage Rating

Ratings from 5 MVA to 750 MVA through 500 kV

Impedance

Single And Three-Phase Core Form Designs 

Why Choose PTT’s High Voltage Power Transformers?
  • Domestic Facilities – Dual ISO 9001:2015 certified facilities in PA & NC.
  • Broad Range – Medium & large core-form designs from 5 MVA - 750 MVA through 500 kV.
  • Engineering Excellence – Backed by decades of design experience and advanced 3D modeling and finite element analysis.
  • Flexible Configurations – Available in generator step-up (GSU), autotransformer, substation, and specialty designs.
  • Superior Capabilities - Facilities include a 2400 kV impulse generator, full tank shop, vapor-phase autoclaves, and automated core cutting & stacking technology, along with dedicated fabrication and insulation departments.
  • Quality Assurance – Designed to exceed ANSI, IEEE, NEMA, & CSA standards.
  • Lifecycle Support – From engineering studies to on-site testing, commissioning, and maintenance.
Benefits to PTT Customers
  • Domestic Operations – All production facilities are located in the USA and are open for customer visits.
  • Trusted Designs – Decades of having a proven track record for product reliability.
  • Dependable Service – All service operations are located domestically, including field service technicians, installation crews and a large parts inventory. 
Typical Transformer Capabilities
Specification Capability
Power Rating Range 5 MVA – 750 MVA
Voltage Rating Through 500 kV
Design Types Core-form, single or three phase
Transformer Applications Utilities, Data Centers, BES, Industrial
Compliance IEEE, ANSI, NEMA, CSA, ISO 9001:2015
Ask How PTT Can Deliver on Your Power Transformer Specifications