Case Study

Asset Breaker Replacements

Client challenge:

Our client, is a leading sustainable energy company with $38 billion in assets and operations in 24 U.S. states. They have two primary lines of business operations: Networks and Renewables. They required SCG Engineering’s help on a project replacing multiple obsolete 115/34.5/13.8 kV breakers, 34.5 kV VT’s, and a 115kV CCVT at multiple existing facilities.The project improved system reliability and overall performance and protection of the Owner’s electrical system.

How we helped:

Our team was commissioned to provide support replacing multiple 115/34.5/13.8 kV breakers, 34.5 kV VT’s, and a 115kV CCVT. The project improved system reliability and overall performance and protection of the Owner’s electrical system.

The project covered several towns in Maine. These substations are comprised of:

  • Nine (9) 115kV circuit breakers
  • Fifty-five (55) 34.5kV circuit breakers
  • Two (2) 13.8kV reactor breakers
  • One (1) 12.47kV circuit breakers
  • Ten (10) 34.5kV voltage transformers
  • One (1) 115kV capacitor coupled voltage transformer.

The upgrades included replacing the new breakers with an SEL-2411 that is prewired with standard alarms, installing the corning fiber patch panel in the control house to accommodate the fiber connections required by the new breaker replacements, implementing the latest protection and control schemes and SCADA if possible, re-using all the existing cables, VT’s and CCVT if possible.

We were responsible for all substation electrical, protection and control and relay settings design. These included conceptual design, equipment specifications, outage sequencing, coordination studies, construction, and commissioning support.

Results:

The project was completed with no notable issues. All work was completed on time and on budget without putting additional burden on the client or client resources. The project was a direct award and not competitively bid; therefore, the work was appropriately estimated while demonstrating SGC’s valuable sales ability.

115kV CCVT

115kV SF6 breaker

115kV SF6 breaker

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