PTT Delivers Power Transformer Solutions
From ​5 MVA to 750 MVA through 765kV

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 765kV, built for performance, reliability, and longevity.

Pennsylvania Transformer Technology (PTT) designs and assembles high-voltage power transformers ranging from ​5 MVA to 750 MVA through 765kV, engineered for reliable performance across utility, industrial, and grid applications. Each transformer is custom-engineered in the USA using advanced 3D modeling, finite element analysis, and precision assembly to ensure maximum efficiency, durability, and electrical integrity. With ISO 9001:2015 certified facilities and proven expertise in custom transformer design, PTT delivers power transformers that exceed ANSI, IEEE, NEMA, and CSA standards for quality and long-term reliability.

Check Out Key PTT Power Transformer Projects

Transforming the Grid: High-Voltage Power Solutions from 40 MVA to 345 kV

345kV
TRANSFORMER

PROJECT: The 345kV 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 

138kV
TRANSFORMER

PROJECT: The 138kV high-voltage power transformer from PTT provides elite-tier utility performance — offering 105/140/175 MVA capacity, dual-stage ONAN/ONAF/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

69kV
TRANSFORMER

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

69kV
​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 765kV

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 Pennsylvania and North Carolina
  • Broad Range – Medium & large core-form designs from 5 MVA - 750 MVA through 765kV.
  • 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 2400kV 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 765kV
Design Types Core-form, single or three phase
Transformer Applications Utilities, Data Centers, Renewables, BESS and Industrial Applications.
Compliance IEEE, ANSI, NEMA, CSA, ISO 9001:2015
Ask How PTT Can Deliver on Your Power Transformer Specifications