Substation Field Testing in North Carolina
Southern Switch & Contacts provides substation field testing and electrical maintenance throughout North Carolina. The state's utility map is dominated by Duke Energy — Duke Energy Carolinas serves the western Piedmont and Foothills regions, while Duke Energy Progress serves the central and eastern portions of the state. Dominion Energy North Carolina covers the northeastern corner, and ElectriCities serves the state's municipal electric systems. A large network of electric membership cooperatives serves rural customers statewide.
North Carolina's rapid growth in the Research Triangle, Charlotte metro, and coastal areas has driven significant new substation construction — acceptance testing is an active part of our North Carolina work. The existing legacy fleet in rural cooperative and municipal systems represents the maintenance testing side of the market.
DGA, Doble power factor, TTR, SFRA, winding resistance, bushing power factor and capacitance, insulation resistance, oil quality, and tap-changer maintenance.
Contact timing, contact resistance, insulation power factor, minimum trip voltage, SF6 gas, and primary injection on medium- and high-voltage circuit breakers.
NETA ATS-compliant commissioning on new substations, transformer replacements, circuit breaker additions, and protection system upgrades.
Periodic maintenance test programs for transformers, breakers, instrument transformers, surge arresters, and protective relays.
VLF withstand and tan delta for medium-voltage cable, TDR fault location, and pre-energization proof testing.
Energized scanning of bus connections, cable terminations, transformer cooling systems, and switchgear for hot spots before failures.
Station battery performance and service tests to IEEE 450 and NERC PRC-005 documentation.
Rapid deployment for transformer failures and substation events throughout North Carolina.
We work with customers across Duke Energy Carolinas, Duke Energy Progress, and Dominion Energy NC, as well as municipal systems served through ElectriCities and the EMC network — including Central EMC, Randolph EMC, Roanoke Electric, Tideland EMC, Cape Hatteras EMC, South River EMC, Four County EMC, and others. Industrial customers with dedicated transmission or distribution substation infrastructure are a regular part of our North Carolina work.
Coverage areas include Charlotte, Raleigh, Greensboro, Durham, Winston-Salem, Fayetteville, Asheville, Wilmington, and rural systems throughout the Piedmont, Mountains, and Coastal Plain.
Tell us what you need tested, your outage window, and site location — we'll put together a scope and mobilization plan.
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