PAD-MOUNT DISTRIBUTION TRANSFORMERS

U.S.-Assembled EHV Shunt Reactors Delivering Proven Engineering, Broad MVAr ratings, & Advanced Gapped-Core Technology

HV Power Transformer 40 MVA, 3-Phase
American Assembled EHV Shunt Reactors

Pennsylvania Transformer Technology, LLC (PTT), a Quanta Services company, is one of the only U.S.-based providers offering American-assembled Extra High Voltage (EHV) shunt reactors. Designed and built by expert engineers, our reactors deliver dependable voltage control, optimized reactive power management, and long-term system stability for utilities across the nation.

PTT’s American-assembled EHV shunt reactors provide a dependable, domestically supported alternative to imported units, giving utilities greater supply security and faster response. Engineered with advanced gapped-core, oil-filled construction and fully compliant with IEEE C57.21, they deliver high-performance reactive-power control with ratings up to 150 MVAr and voltages through 765 kV—ensuring long-term grid stability and operational efficiency.

Why Choose PTT for High-Voltage Shunt Reactors

Shunt Reactor ​Voltages Through 756kV

  • Assembled in the USA – One of the only U.S.-based manufacturers producing EHV shunt reactors.
  • Proven Expertise – Backed by a highly skilled, industry-leading design and engineering team.
  • Broad Ratings – Available up to 150 MVAr for demanding reactive-power applications.
  • High Voltage Range – Designed for voltages through 765 kV to support modern grid requirements.  
  • Advanced Technology – Gapped-core, oil-filled construction ensures reliable and efficient performance.
  • Built for Compliance – Fully meets IEEE Standard C57.21 for safety and reliability.
  • Flexible Design Options – Tailored configurations to meet unique utility and system needs.
  • American Workforce – Proudly assembled by experienced American workers with 100% domestic support.  

PROJECT EXAMPLE: ONAN - 3 PHASE - 60 HERTZ SHUNT REACTOR RATED 50 MVar, 230kV (CONSERVATOR OIL PRESERVATION)

PTT’s American-assembled, IEEE-compliant shunt reactors—engineered with advanced gapped-core, oil-filled construction and supported by flexible, expert-driven design—directly enabled the successful delivery of the ONAN 50 MVAr, 230kV project. By applying proven engineering expertise and tailoring the unit to the customer’s performance and reliability needs, PTT delivered a reactor that provides dependable reactive-power control, stable voltage management, and long-term grid stability.

EHV Shunt Reactors | American-Assembled Grid Solutions
RATING VALUE
Number of phases Three
Coolant Mineral Oil Filled
Type ONAN
Frequency 60 Hertz
Reactive Power 50 MVAr at 65C rise
Voltage 230000Y/132791 Volts
Grounding Solidly Grounded Wye
HV BIL 900kV
HV NEUTRAL BIL 150kV
​MVA Ratings

U.S.-Assembled EHV Shunt Reactors

Cooling System Options

Proven Engineering Backed by Decades of Expertise

Voltage Rating

Ratings Up to 150 MVAr & Voltages Through 765kV

Impedance

Gapped-Core, Oil-Filled Design, IEEE C57.21 Compliant

PTT Shunt Reactor Frequently Asked Questions

What Are The Advantages of PTT Shunt Reactors?

  • One of the Only U.S.-Based Shunt Reactor Providers – Delivering domestic production and direct access to U.S. engineering.
  • Proudly Assembled by American Workers – Built with skilled craftsmanship, precise winding, and rigorous quality controls.
  • No International Travel Required – All design reviews, inspections, and witness tests occur in the U.S. for easier coordination and visitation.
  • 100% Domestic Customer Service – Responsive U.S.-based support teams provide fast technical assistance and lifecycle service.

What Are The Typical Functions of EHV Shunt Reactors?

  • Neutralizes Excess VARs – Absorbs unwanted reactive power to maintain proper system balance.
  • Prevents Overvoltages – Controls voltage rise during light-load or long-line conditions.
  • Stabilizes Power Systems – Supports steady voltage levels to improve overall grid performance.
  • Counteracts the Ferranti Effect – Reduces voltage buildup on long transmission lines.
  • Enhances Power Quality – Minimizes fluctuations and improves system efficiency and reliability.

What Are Customer Advantages of PTT Shunt Reactors?

  • Balances Reactive Power & Improves Power Factor – Optimizes system performance by absorbing excess VARs & supporting more efficient power flow.
  • Maintains Voltage Stability – Helps keep transmission voltages within safe operating limits, even under varying load conditions.
  • Protects Critical Equipment – Reduces stress on transformers, breakers, and other grid assets by preventing damaging voltage rises.
  • Reduces Fluctuations for Efficiency Gains – Minimizes voltage swings and power quality issues, improving overall system reliability and operational efficiency.
Ask How PTT Can Deliver on Your Power Transformer Specifications