Substation Field Testing in Tennessee
Southern Switch & Contacts deploys field crews throughout Tennessee for transformer testing, circuit breaker testing, acceptance testing, and substation maintenance. Tennessee's electric utility structure is nearly unique in the United States: the Tennessee Valley Authority (TVA) generates and transmits power across the state, and that power is then distributed by a network of municipal utilities, county distributors, and electric cooperatives — more than 150 distribution systems in total, each operating its own distribution substation infrastructure.
The diversity of that distributor network means Tennessee has a wide range of substation equipment ages and maintenance program maturity. Large municipal systems like Nashville Electric Service, Memphis Light Gas and Water, Knoxville Utilities Board, and Chattanooga EPB operate structured testing programs. Smaller county systems often need an outside contractor to provide both the test equipment and the program structure.
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, 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.
Station battery performance and service tests to IEEE 450 and NERC PRC-005 documentation.
Rapid deployment for transformer failures and substation events throughout Tennessee — post-fault assessment and path to restoration.
We serve customers across Tennessee's TVA distributor network — including Nashville Electric Service (NES), Memphis Light Gas and Water (MLGW), Knoxville Utilities Board (KUB), Chattanooga EPB, Murfreesboro Electric, Jackson Energy Authority, Bristol Tennessee Essential Services, and county and cooperative systems across the state. We also support industrial customers with dedicated substation infrastructure and large renewable energy projects tying into the TVA system.
Coverage areas include Nashville, Memphis, Knoxville, Chattanooga, Clarksville, Murfreesboro, Jackson, Johnson City, Kingsport, Bristol, and rural systems throughout East, Middle, and West Tennessee.
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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