Pennsylvania Transformer Technology, LLC (PTT), a Quanta Services company, designs and assembles oil-filled power transformers for utilities, data centers, renewable energy, battery storage and industrial applications. Our U.S. operations support custom transformer projects for customers in the United States and Canada, backed by engineering experience dating to 1929.
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.
345kVTRANSFORMER
PROJECT: This 345 kV power transformer project supports substation and transmission applications with 90/120/150 MVA ratings across ONAN/ONAF/ONAF cooling stages. Copper windings and staged cooling are configured for the project’s operating requirements.
138kVTRANSFORMER
PROJECT: This 138 kV power transformer project provides 105/140/175 MVA ratings across ONAN/ONAF/ONAF cooling stages. The design includes load tap changing for voltage regulation, with the detailed project page outlining its electrical configuration and operating features.
69kVTRANSFORMER
PROJECT: This 69 kV, 40 MVA power transformer combines a three-phase, copper-wound design with staged cooling and automatic load tap changing for substation applications. Review the project specifications to understand its configuration and suitability for your system.
Assembled With Pride and Skill in The USA
Decades of Proven Engineering Expertise & Success
Ratings from 5 MVA to 750 MVA through 765kV
Single And Three-Phase Core Form Designs
Find answers about PTT transformer ratings, custom EHV designs, standards and project requirements.
PTT’s power transformer portfolio spans 5 to 750 MVA, with voltage capabilities through 765 kV. These are overall portfolio limits; the available voltage and MVA combination depends on the transformer design and project requirements. Contact PTT to review a specific 765 kV transformer or 750 MVA transformer application.
Discuss your transformer ratings.
MVA measures apparent power capacity, while kV measures voltage. A 750 MVA transformer rating describes capacity; a 765 kV rating describes a voltage level. Both are needed, along with the other winding voltages and cooling requirements, to define a transformer specification. For scale, 750 MVA equals 750,000 kVA.
The featured PTT 345 kV power transformer has 90/120/150 MVA ratings across ONAN/ONAF/ONAF cooling stages for substation and transmission applications. ONAN uses natural oil and natural air cooling; ONAF adds forced-air cooling. These ratings describe this project, rather than every 345 kV transformer PTT can configure.
Explore the 345 kV project.
Yes. PTT custom-engineers extra-high-voltage (EHV) transformers around the project’s electrical and site requirements. Design inputs include winding voltages, MVA ratings, insulation levels, impedance, cooling, tap changing, loss requirements and transportation limits. PTT offers core-form designs in single-phase and three-phase configurations, depending on the application.
Review PTT transformer products.
The applicable ANSI, IEEE, NEMA and CSA requirements are established in the project specification and technical agreement. PTT reviews these requirements as part of the custom design process. Ask the engineering team to identify the standards, editions and tests applicable to your transformer, and document any project-specific requirements in the quotation.
Discuss standards with PTT.
PTT operates U.S. production facilities in Canonsburg, Pennsylvania, and Raeford, North Carolina, under ISO 9001:2015 quality management processes. ISO 9001 addresses the quality management system; product design requirements and acceptance tests are specified separately for each transformer. Review PTT’s current certificate for the covered facilities and activities.
View the current ISO certificate.
Yes. PTT designs transformers for utilities, data centers, renewable energy projects, battery energy storage systems (BESS) and industrial facilities. Available configurations include substation transformers, generator step-up transformers, autotransformers and specialty designs. Selection depends on the connection voltage, capacity, load profile and operating conditions.
Explore transformer products.
Share the application, primary and secondary voltages, any tertiary voltage, MVA ratings by cooling stage, frequency, insulation level, impedance and tap-changing requirements. Include site conditions, fluid preferences, loss and noise limits, footprint and shipping constraints, and the required delivery date. PTT’s sales and engineering teams can help clarify incomplete specifications.
Request a transformer quote.
We utilize third party tracking technologies (described in the "Preferences" link) that collects your data (e.g., device, site activity, & IP address) when you interact with our website and further shares this data with third party social media, analytics, and/or marketing providers for user personalization, data analytics, and marketing purposes (including targeted ads). By accessing our website and clicking the "Accept All" button or making your preference selections using the Preferences link, you CONSENT to the above activities as further described in our Privacy Policy. Exercising your consent options will not prevent you from purchasing our products or services.
Manage your cookie preferences below:
Essential cookies enable basic functions and are necessary for the proper function of the website.
These cookies are needed for adding comments on this website.
Google reCAPTCHA helps protect websites from spam and abuse by verifying user interactions through challenges.
Google Tag Manager simplifies the management of marketing tags on your website without code changes.
Statistics cookies collect information anonymously. This information helps us understand how visitors use our website.
Google Analytics is a powerful tool that tracks and analyzes website traffic for informed marketing decisions.
Service URL: policies.google.com (opens in a new window)
Marketing cookies are used to follow visitors to websites. The intention is to show ads that are relevant and engaging to the individual user.
Facebook Pixel is a web analytics service that tracks and reports website traffic.
Service URL: www.facebook.com (opens in a new window)
