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Primary unit substations | Secondary 1000 V and above

Eaton’s primary unit substation transformer is ideal for stepping down utility distribution voltages to in-plant distribution voltages. By locating the medium-voltage transformer and close-coupled equipment near areas of load concentration, the secondary distribution cables/buses are kept to minimum lengths, resulting in advantages including reduced power losses and exposure to faults, and improved voltage regulation and service continuity.

Primary unit substations | Secondary 1000 V and above
Primary voltage
6.9 kVA - 69 kV
Transformer kVA
500 kVA - 20,000 kVA
Secondary voltage
2.4 kV - 34.5 kV

Core features

  • Provides complete electrical and mechanical control over coordination of the three close-coupled sections
  • Exceptional flexibility afforded through availability of all switchgear types as secondaries  
  • Coordinated connection design minimizes installation costs
  • Compact design uses space efficiently
  • Single-source responsibility including assembly/integration streamlines processes
  • NEMA® Standard No. 201-1982
  • IEEE® Standard No. 100-1977

Easy to specify

Standardization through IEEE results in proven unit substation designs with complete accessories and features.

Highest short-circuit strength

Highly researched and thoroughly tested unit substation designs withstand repeated large short-circuit currents in modern systems.

Cost-effective design

Compact unit substation designs reduce space requirements and the cost of rigging and hauling, while standard design and accessories reduce maintenance costs.

Liquid-filled transformers

Eaton’s Cooper Power series substation transformers are optimized to perform in the most rigorous sectors of industry and are designed to last. Transformers can be filled with Envirotemp FR3 fluid, offering fire safety and extended life or with conventional mineral oil for common applications.

Dry type transformers

Eaton’s dry type transformer solutions are custom-designed dry-type power transformers, which give environmental protection, for both indoor and outdoor applications. 

Eaton’s Electrical Engineering Services and Systems

With more than 1,500 experts in 60 locations throughout Canada and the U.S., and more around the world, Eaton’s Electrical Engineering Services and Systems team is one of the largest and most experienced service organizations in the industry.