RESA Power Transformer Services is a warranty service provider for many of the original equipment manufacturers and will provide you with that same quality service and repair that the manufacturers receive as you should expect.

Expert technicians will analyze your equipment, make recommendations, and perform the services that you need to assure the longevity of your electrical apparatus. Our commitment to detail and customer satisfaction will give you the peace of mind that your equipment is UP to the task.

Whether it’s a simple pad mount leak repair, substation preventative maintenance, or a power transformer retrofit, you need to look no further than the experts at RESA Power Transformer Services to assure the reliability of your electrical assets.


Transformer maintenance services are vital to ensuring the efficient and reliable operation of your electrical systems. Transformers play a pivotal role in the function of nearly all industries, making transformer service an essential part of transformer upkeep and ownership. While transformers are designed to be durable and require little maintenance, units will eventually need some form of service. The NETA-certified technicians at RESA Power Service keep your transformers running smoothly with services like

  • Electrical Acceptance Testing & Commissioning
  • Electrical Maintenance and Testing
  • Transformer Oil Testing and Fluid Maintenance
  • Power Transformer Retrofit
  • Substation Preventative Maintenance
  • Regulators, Reclosers, Switchgear Services
  • Pad Mount Leak Repair
  • Rewinds/ Stackings
  • Dielectric Fluid Analytical Services
  • Infrared Inspections
  • Circuit Breaker Remanufacturing

RESA Power provides the professional transformer and switchgear services you need to help keep your electrical power operating without interruption. We offer comprehensive transformer and switchgear testing to help prevent system failures. In emergency situations, RESA Power technicians respond with prompt electrical services to ensure the reliability and integrity of your electrical assets.

Choosing RESA Power for transformer, switchgear or other electrical equipment testing and repairs can save you time and money. Don’t defer or delay maintenance, contact RESA Power service location close before another failure occurs.

RESA Power can perform all necessary switchgear inspections, relay tests, electrical equipment cleaning, and calibration needed to keep your electrical systems in optimal operating condition.

  • High Current Testing
  • Relay Testing
  • Full Electrical Testing
  • Partial Discharge Cable Testing

A thorough, scheduled electrical maintenance testing program costs you much less than the impact of equipment failure or worker injury. For complete electrical power system maintenance and testing services, contact RESA Power today.


When transformers fail, downtime can cost you more than just inconvenience. Regardless of the location or type, indoor or outdoor, basement or roof, oil filled or dry type, RESA Power will engineer the design and fit of the replacement transformer. We will remove the old transformer, supply the replacement, and duplicate the electrical connections and dimensional characteristics safely and efficiently.

If you are in need of PCB transformer disposal or replacement, please reach out to our Transformer Service Group today: Transformer Services West and Transformer Services East.

Choosing RESA Power for transformer replacement is your correct option, contact us today.


Cabinet-Style Transformers

Arc flash boundaries prescribed by NFPA 70E place severe restrictions regarding work on energized padmount transformers. The 24/7 operating rhythm of many industrial companies makes it difficult to remove this equipment from service, even for a brief period. RESA Power enables technicians to gain safe access without disrupting operations with Sample Guard.

  • Sample Guard enables safe access to oil samples and nitrogen service lines by relocating them to an enclosure mounted outside the transformer. Technicians can pull oil samples and service the nitrogen blanket with zero risk of Arc Flash.
  • Sample Guard comes with all the necessary hardware and is easy to install. The NEMA powder-coated box will last for years in all types of weather.

Premium Sample Guard

sample guard enclosure for power transformer


Power transformers are a critical part of any power grid, providing a vital link between generation and consumption. To ensure power quality and reliability, it is essential to regularly test and analyze transformer oil. This helps to identify any degradation or contamination that may be present, allowing for corrective action to be taken before any damage occurs. Transformer oil testing and analysis is therefore an essential part of power transformer maintenance services. By regularly carrying out this procedure, your company can help to ensure the continuity of power supply and avoid costly downtime.


RESA Power’s Transformer oil testing and analysis is a cost-effective, preventive maintenance tool for your electrical power system.

The insulating fluid in a power transformer performs two major functions:

  1. Serves as electrical insulation to withstand the high voltages inside the transformer
  2. Acts as a heat transfer medium to carry out heat generated within the transformer windings

Don’t ignore fluid testing until a failure occurs. Transformer oil maintenance is the key to transformer reliability, performance and longevity. Your transformer’s insulating oil should be free from moisture, dissolved gases and particles that accumulate as the oil ages. Even some new oils may require treatment to limit these contaminants to acceptable levels. Sampling and analysis of the fluid form the cornerstone of transformer preventive maintenance.

Our Oil Testing Services

RESA Power Service offers expert oil laboratory and field services to customers around the world. Samples can be mailed into our full-service laboratory or drawn by one of our highly trained field service technicians. Your transformer fluids will then be analyzed to identify any potential or current problems with your equipment.

Transformer services, transformer repair, Transformer maintenance, transformer oil testing, transformer lab services


  • Oil Quality
  • Water Content
  • Dissolved Gas Analysis (DGA)
  • Inhibitor Content
  • Furan Test
  • Resistivity Test
  • Corrosive Sulfur
  • Particle Count
  • PCB Analysis of Insulating Fluid
  • Dissolved Metals Test
  • Liquid Power Factor at
  • 25°C & 100°C
Transformer services, transformer repair, Transformer maintenance, transformer testing, transformer oil testing, lab services


  • On-Site Fluid Sampling & Inspection Services
  • Repairs: Tap Changers, Gauges, Radiators
  • Valves, Bushings, Etc.
  • Minor Internal Repairs
  • Electrical Testing
  • De-energized Insulator Cleaning
  • Leak Repairs & Clean-up
  • Painting / Repainting
  • Nitrogen Pressurizing Service
  • Safe-TTR™ Sampling Enclosure
  • NFPA 70E Solutions
  • Load Tap Changer Services


  • Hot Oil Reconditioning
  • De-gasification of Oil
  • Dehydration of Oil
  • Standard Oil Filtering
  • Vacuum Filling
  • Retrofill with New Oil
  • Inhibi-TTR™ Inhibitor Injection
  • Passiv8-TTR™ – Corrosive Sulfur
  • Other Fluid Services

All tests are conducted in accordance with ASTM, IEEE, IEC and NETA standards in the RESA California laboratory. In addition to a comprehensive test report that details all test analysis data, also included will be recommendations for possible corrective actions detected by the test analysis and inspection(s). All equipment will be photographed and photos are made a permanent part of the records and added to the finished test report.


RESA Power has more than 25 service locations across the United States and Canada, including a transformer oil testing laboratory and specialty distribution centers to ensure our customers’ critical power systems are safe, reliable, and operating at peak efficiency. Click on the service center nearest to you for more information.