Pennsylvania Transformer Technology, LLC

Delivered to Florida

69kV, 44.8 MVA unit (69 D - 13.8YkV)

69kV High Voltage Power Transformer 40 MVA, ​13.8 kV, 60 Hz

HV Power Transformer 40 MVA, 3-Phase
Reliable Power, Proven Performance

Delivering 69kV 40 MVA of dependable power, this Power Transformer project combines precision engineering, advanced cooling, and copper-wound durability to keep the substation running efficiently and reliably for decades.

This Substation Power Transformer Project by Pennsylvania Transformer Technology, LLC (PTT) is a high-performance, three-phase unit delivering up to 40 MVA at 69/13.8kV for reliable and efficient power distribution. Expertly engineered to ANSI, IEEE, NEMA, and ASTM standards, this transformer features advanced ONAN/ONAF/OFAF cooling, copper windings, and a precision load tap changer for stable voltage regulation. Complete with bushings, oil, surge arresters, and accessory equipment, the 69kV transformer is built for long-lasting performance, superior thermal efficiency, and dependable operation in utility and substation environments. Let PTT engineer a custom solution to meet your needs.  

Key Specifications Power Transformer 69kV 40 MVA

​MVA Ratings

MVA Ratings

  • Self-cooled (ONAN): 24 MVA @ 55/65°C rise (by resistance)
  • 1st stage cooling (ONAF): 36 MVA @ 55/65°C rise
  • 2nd stage cooling (OFAF): 40 MVA @ 55/65°C rise
Cooling System Options

Cooling System Method

  • ONAN / ONAF / ONAF — Oil Natural Air Natural for base rating and Oil Natural Air Forced for higher ratings.
Voltage Rating

Voltage Rating

  • 69 / 13.8 kV, 60 Hz
Impedance

Impedance

  • Base: 24 MVA
  • Must be within applicable ANSI limits at lowest temperature rise
69kV, 40 MVA Power Transformer Key Features
  • High capacity design: Rated for up to 40 MVA, 69/13.8kV, three-phase operation.
  • Advanced cooling system: Dual-stage ONAN/ONAF/ONAF configuration with automatic temperature control.
  • Copper windings: Ensures optimal conductivity, efficiency, and longevity under heavy load.
  • Load Tap Changer (LTC): Reinhausen RMV-II mechanism providing ±10% voltage adjustment in 32 steps.
  • Precision voltage regulation: Automatic control with Beckwith Model M-2001C system for smooth load balancing.
  • Durable tank design: Welded steel plate construction with bolted radiators, corrosion protection, and OSHA-approved fall safety system.
  • Comprehensive protection: Surge arresters, bushing current transformers, pressure relief devices, and sudden pressure relays.
  • Oil preservation system: Automatic nitrogen system with pressure regulation and alarm contacts for reliability.
  • Compliant engineering: Built to ANSI, IEEE, ASTM, and NEMA standards for performance and safety.
  • Thorough testing and inspection: Includes factory and field acceptance testing per ANSI C57.12 standards.
69kV, 40 MVA Power Transformer Key Benefits
  • Superior reliability: Engineered to deliver continuous, stable power with minimal downtime in demanding substation environments.
  • Extended equipment lifespan: Efficient cooling and robust copper windings reduce thermal stress and extend operational life.
  • Improved voltage stability: Automatic load tap changing maintains consistent voltage under fluctuating load conditions.
  • Enhanced operational safety: Equipped with advanced alarms, relays, and safety controls to protect personnel and equipment.
  • Ease of maintenance: Accessible design with removable components, diagnostic indicators, and comprehensive monitoring systems.
  • Lower lifecycle costs: Optimized design minimizes losses, boosting efficiency and reducing total operating expenses.
  • Regulatory assurance: Fully compliant with major U.S. electrical standards, ensuring code alignment and utility compatibility.
  • Proven performance: Built by experienced engineers to meet exacting customer specifications with guaranteed quality testing.

69 kV, 40 MVA Power Transformer: Frequently Asked Questions

Explore the featured Pennsylvania Transformer Technology project’s ratings, voltage regulation, construction and protection.

What MVA ratings are listed for PTT's featured 69 kV transformer?

The project’s specification table lists staged ratings of 24 MVA self-cooled, 36 MVA with first-stage cooling and 40 MVA with second-stage cooling.

What are this transformer's voltage, phase and frequency ratings?

The featured transformer operates at 69/13.8 kV with three-phase, 60 Hz service for utility and substation power distribution.

How does this transformer maintain stable output voltage?

A Reinhausen RMV-II load tap changer provides ±10% adjustment in 32 steps, with automatic voltage control through a Beckwith M-2001C controller.

Does PTT use copper windings in this transformer?

Yes. The featured transformer uses copper windings to support conductivity and dependable operation under heavy electrical loads.

What protective equipment is included with this transformer?

Protection includes surge arresters, bushing current transformers, pressure relief devices and sudden pressure relays, plus monitoring and alarm features.

What standards and testing requirements apply to this transformer?

PTT builds this transformer to ANSI, IEEE, ASTM and NEMA standards, with factory and field acceptance testing per ANSI C57.12 requirements.

Discuss your transformer specifications with PTT. Request project information or call (724) 873-2100.

Ask How PTT Can Deliver on Your Power Transformer Specifications