Distribution Transformers
Multiple projects are underway at EPRI to learn more about distribution transformers.
EPRI is testing solid-dielectric insulated transformers as part of the Overhead Assets project.
EPRI is identifying degraded transformers to perform testing on online condition monitors.
Utilities have concerns about transformers performance as electrification increases.
Industry Challenge
Distribution transformers are an essential and, historically, stable component of the electric power grid, providing the final voltage transformation that allows electricity to be used in homes, businesses, and other facilities. Recent transformer shortages combined with proposed increases in efficiency requirements are incentivizing utilities to focus on maintaining their existing fleets, identify new suppliers, and consider deployment of relatively unfamiliar transformer technologies.
EPRI’s Response
Given the need to begin deploying new products and materials to cope with supply chain shortages, EPRI has multiple projects underway to help utilities understand the near and long-term implications of using new transformers. Efforts include evaluation and application of:
- Solid-dielectric insulated transformer
- Solid-state, power electronics-based transformer technologies
- Transformer monitoring systems
- Remaining life algorithms that help assess transformer condition
Progress, Results, & Next Steps
Due to the immediate industry need, EPRI is working on the following research activities:
EPRI has begun performing electrical testing on various transformers and technologies at the EPRI Power Delivery Laboratory in Lenox, ,MA. A new transformer test facility is underway to accelerate efforts.
Utilities have requested aid to apply a common transformer remaining life algorithm provided in industry standards. EPRI is helping utilities understand the application and limitations of the algorithm.
How to Use the Research
As EPRI completes this research, the information gathered and data generated is going to feed into utility decision making. Utilities can apply knowledge and practices shared by other utilities, use the performance data to improve transformer selection, and better prioritize transformer replacement based on estimated remaining life.
How to Get Involved
Transformer research has been integrated in existing and standalone projects that are ongoing and coming soon. These include:
- Project 180.001 – Overhead Assets (underway)
- Transformer monitoring systems under evaluation
- Solid-State Transformer Testing (underway)
- Project investigating performance of a prototype solid-state transformer
- Impact of Electrification (2025)
- Collaborative project investigating how increasing levels of electrification could impact asset performance, including transformers and other assets.
- Transformer Aging and Failure Analysis
- On demand projects tailored based on utility requirements
If you’d like to get involved or have any questions, please reach out to Joe Potvin (jpotvin@epri.com).