- Suffolk 500-kV Substation
Dominion Virginia Power’s Suffolk Substation was Burns & McDonnell’s first work on Dominion’s 500-kV transmission system. This project expanded the substation to accommodate a new 500/230-kV, 840MVA transformer bank, two new 500-kV circuit breakers, one new 230-kV low side breaker and all associated auxiliary equipment.
Burns & McDonnell provided engineering services for the project, which cut the existing 500-kV 531 line from Surry Substation to Yadkin Substation, which travels in the right-of-way adjacent to the Suffolk Substation. This was the first segment of a two-phase plan to install a six-position, 500-kV ring bus with two transformer banks and four lines. Burns & McDonnell provided all facets of physical design for this 500-kV yard addition. The services provided for the physical portion of this venture included rigid bus design, strain bus design, grounding design, conduit design, cable schedule design, grounding simulation using CDEGS, foundation design, surface voltage gradient calculations, steel structure design, lightning protection design, and the implementation of all associated equipment.
The system protection work included the addition of two line panels, three breaker panels, one transformer differential panel, one DFR cabinet, two communications processors, three logic controller annunciators, and the replacement of two breaker panels. The system protection design provided all the one-lines, relay schemes, communication schemes, panel wiring diagrams, and mechanism wiring diagrams.
- 500-kV protection and control design
- 500-kV physical design
- 230-kV protection and control design
- 230-kV physical design
- Grounding analysis
- Transformer oil containment
- Separation of a 500-kV transmission line
- Upgrading the existing site to a 500-kV station
- Four single-phase, 500/230-kV 280MVA transformers (one spare)
- Two 500-kV Mitsubishi dead tank breakers
- 12 relay panels
- One 125-VDC 400AH battery system and 35A charger