If you need reliable transformer services, look no further than RESA Power. As a certified warranty service provider for many original equipment manufacturers, we guarantee high-quality transformer repair and maintenance that meets their stringent standards.

Our skilled technicians carefully analyze your equipment and provide transformer maintenance services that help extend its lifespan. We take pride in our attention to detail and commitment to customer satisfaction, so you can be sure that your electrical apparatus is in capable hands.

Whether you need a simple pad mount leak repair or a complex power transformer retrofit, you can trust RESA Power for comprehensive transformer services. We are dedicated to ensuring the reliability of your electrical assets so that your equipment is always up to the task.

Portfolio of RESA Power Transformer Services

Transformer Assemblies LV-EHV:

We specialize in assembling transformers ranging from low voltage to extra high voltage, ensuring that all components are meticulously assembled and tested to guarantee optimal performance and reliability.

Transformer Troubleshooting & Repairs LV-EHV:

Our team of expert technicians is highly experienced in troubleshooting and repairing transformers across a wide range of voltage levels. We utilize advanced diagnostic tools and techniques to identify and resolve issues promptly, ensuring minimal downtime for your operations.

Acceptance Testing / Commissioning LV-EHV:

We provide comprehensive acceptance testing and commissioning services for transformers, ensuring that newly installed units meet all required specifications and standards. Our meticulous testing procedures and commissioning processes provide validation of the integrity and performance of your transformers.

Relocation Services:

We offer professional relocation services for transformers, managing the entire process from disassembly and transportation to reinstallation and commissioning. Our experienced team ensures that the relocation is carried out efficiently and safely.

Oil Processing, Degassing, Retrofills, Reclamation:

Our comprehensive range of transformer oil services includes processing, degassing, retrofills, and reclamation, ensuring the optimal quality and performance of transformer insulation oil.

LTC Maintenance & Retrofits:

We specialize in LTC (load tap changer) maintenance and retrofits, ensuring the longevity and efficient operation of your transformers with reliable load management solutions.

Transformer Electrical Testing LV-EHV:

We offer a wide range of electrical testing services for transformers across various voltage levels, ensuring the safety and reliability of your equipment.

Bushing Testing, Repairs, and Replacements:

Our expert technicians are equipped to perform thorough testing, repairs, and replacements of transformer bushings to maintain the integrity and reliability of your transformers.

Leak Repairs, Regaskets:

We provide comprehensive leak repair and regasketing services to address any issues related to transformer leaks, ensuring the integrity of your transformer’s enclosure.

Lab Testing, Dissolved Gas Analysis, and Oil Quality Testing:

We offer in-depth laboratory testing, including dissolved gas analysis and oil quality testing, to assess and monitor the condition of transformer oil and provide valuable insights into the health of your transformers.

New & Used Transformer Sales:

As a trusted provider in the industry, we offer a range of new and used transformers for sale, accompanied by expert guidance to help you find the best solution for your specific needs.


Ensure efficient and reliable performance of your electrical systems with our comprehensive transformer services. We understand the critical role transformers play across numerous industries, and that’s why we offer top-notch transformer maintenance services that cover your equipment’s entire lifecycle.

Although transformers are durable and require low maintenance, occasional servicing is necessary. At RESA Power Service, our NETA-certified technicians work tirelessly to ensure that your power equipment runs flawlessly. Our power transformer services include:

Trust us to keep your transformers in peak condition.

Transformer Acceptance Testing and Commissioning Services

With RESA Power’s Transformer Acceptance Testing and Commissioning Services, you can safeguard the health and performance of your transformers and related equipment. Our NETA-certified technicians provide professional transformer services, including rigorous testing, repair, and maintenance, which can prevent delays and detect issues before they cause problems. This can help ensure uninterrupted operations for your power systems and protect your team.

In case of emergencies, RESA Power is always available to respond promptly and uphold the reliability of your electrical assets. By selecting RESA Power for your electrical equipment testing, switchgear, or transformer repair services, you can ultimately save time and money.

Prevent Downtown With Regular Transformer Maintenance

Don’t hesitate when it comes to continual transformer maintenance. Reach out to your nearest RESA Power service location before transformer failure occurs. Our team can conduct all necessary switchgear inspections, relay tests, calibration, and electrical equipment cleaning to maintain your electrical systems in peak condition.

Investing in a thorough and scheduled electrical maintenance testing program with RESA Power can significantly reduce the costs associated with equipment failure or worker injury. Contact RESA Power today for comprehensive power transformer services.


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 as your transformer repair company is the best way to secure your investment and protect your equipment – 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 to transformer maintenance services 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 component of any power grid, as they connect power generation to consumption. To ensure their reliability, regular transformer oil testing services are necessary. These services detect potential degradation or contamination, which allows for pre-emptive actions that prevent damage, making it a vital aspect of transformer maintenance services. Implementing these services not only safeguards power supply continuity, but also prevents expensive 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 worldwide. Samples can be mailed to our full-service laboratory or drawn by one of our highly trained field service technicians. Your transformer fluids will then be analyzed to identify potential or current equipment problems.

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 40 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.