Substation Field Services
Turnkey substation services, new construction, scheduled maintenance, switch and transformer work, testing & diagnostics, and emergency repairs. Serving utilities and co-ops across Florida and the Southeast.
Field crews documented on named systems: a 230 kV autotransformer emergency for TECO, transformer elevation serving MacDill AFB, and an LCEC high-side bushing replacement. Read the case studies →
A self-contained shop,
brought to your site.
Our tool trailer puts a fully-equipped mobile shop right at the substation, tools, equipment, and supplies staged on site so our crews can do the work wherever the job is, without trips back and forth to the shop. Pictured on the job in Central Florida, beneath the landmark “Mickey” transmission towers.
Transformer oil processing,
on a Baron rig.
Our Baron rig brings transformer oil processing to you, vacuum dehydration and hot oil processing, so we can dry, filter, and recondition oil right on site. Baron is the industry standard for this equipment, and it’s the rig we operate.
Oil samples for dissolved gas analysis are processed through the TECO lab in Tampa — local, utility-grade, with 24-hour turnaround available when conditions require it.
New substation construction from greenfield through commissioning. On time and on budget, with the advantage that we manufacture many of the components installed.
- Greenfield substation construction
- Equipment installation & setting
- Bus work & connections
- Control & relay installation
- Commissioning & energization support
Scheduled and corrective maintenance for substation equipment. Experienced with all major manufacturers across Florida and Southeast utility systems.
- Switch maintenance & repair
- Transformer processing & service
- Circuit breaker maintenance
- Switch bearing refurbishment in the field
- Testing & diagnostics
What we service on site.
Scheduled, corrective, and emergency work across the substation, transformers, breakers, and disconnect switches. Any parts required can be supplied by Southern Switch & Contacts, manufactured to meet or exceed OEM specifications.
- Inspection
- Bushing changeout
- LTC inspection & maintenance
- LTC motor drive maintenance & repair
- Pump & valve maintenance & repair
- Fan & radiator repair
- Vacuum dehydration
- Hot oil processing
- Control cabinet repair & replacement
- Overall touchup & painting
- Regasketing & assembly
- Preventive maintenance
- Testing
- Bushing changeout
- Breaker changeout
- Commissioning
- Control cabinet repair & replacement
- Oil filtering
- Touchup & painting
- Inspection
- Adjustment
- Testing
- Installation
- Replacement parts
- Refurbishment, live parts, bearings, operators
- Bus modification
Doble-grade testing,
field or shop.
Electrical testing of transformers, circuit breakers, and substation systems, powered by the Doble M4100 high-voltage apparatus tester, the Doble M5400 for SFRA, and the EZCT-2000C for CT testing, plus infrared scanning, battery-bank testing, and SF6 gas service.
- Dielectric testing
- DGA oil testing
- Overall power factor & capacitance
- Bushing power factor
- 3-phase or 1-phase TTR
- 3-phase or 1-phase excitation current
- 3-phase winding resistance
- 3-phase or 1-phase leakage reactance
- Insulation resistance
- CT testing (EZCT-2000C)
- SFRA (Doble M5400)
- Oil, vacuum & SF6 breakers
- Bushing power factor
- Hi-pot
- Insulation resistance
- DLRO contact resistance
- Timing tests
- Infrared (thermographic) scanning
- Battery bank testing
- SF6 gas analysis & handling
When the call
comes at 2 AM,
we answer.
Unplanned outages are costly. Our emergency response dispatches an experienced crew fast, and because our machine shop runs the same way, we can fabricate any needed replacement parts and have them at your site the same day.
A Southern Switch engineer answers the phone, not a queue. Same-day or next-day field dispatch depending on crew availability and travel distance.
A named test menu,
not just “testing.”
Every service below is a real page with the named test methods, the standards they follow (NFPA 70B, IEEE C57, IEEE C37, IEEE 400, IEEE 450, NERC PRC-005), and the apparatus we cover. Click in to see what gets tested and how.
Documented acceptance tests on new substation equipment before energization.
NFPA 70B and IEEE-aligned periodic testing to keep substation equipment in service.
DGA, oil quality analysis, TTR, Doble power factor, and SFRA on power transformers.
Baron rig vacuum dehydration and hot oil circulation. We come to your substation.
Contact resistance, timing, HiPot, and primary injection on oil, vacuum, and air breakers.
VLF tan delta, partial discharge, insulation resistance, and HiPot on medium-voltage cable.
Thermographic surveys of energized substations with documented anomaly reports.
IEEE 450 / 1188 testing on station batteries, chargers, and DC distribution.
24/7 availability with same-day or next-day field dispatch.
Routine and detailed walkdowns, safety, asset condition, NERC PRC-005 readiness.
The technical reading
behind the work.
Our field technicians write about the tests they run every day. If you want to understand what a test measures, what a result means, or how a specific piece of equipment works before we show up, start here.
What CHL, CH, and CL power factor measurements tell you about insulation condition.
C1 and C2 test interpretation, capacitance tip-up, and when a bushing should come out.
How sweep frequency response analysis detects winding deformation, core movement, and loose connections.
What acetylene, hydrogen, and combustible gas ratios reveal about fault type and severity.
Ratio, polarity, excitation curve, knee-point voltage, and burden testing to IEEE C57.13.
Detecting open circuits, shorted turns, tap changer problems, and high-resistance connections.
Contact resistance, timing, oil condition, and mechanism inspection on OCBs.
How thermographic surveys find hot connections before they cause an outage.
Southeast coverage,
state by state.
We're based in Palm Harbor, FL and run crews across the Southeast. Each state page covers the specific utilities, cooperatives, and cities in that service area.
Home state. FPL, Duke Energy Florida, TECO, Seminole Electric, Clay Electric, FKEC, and rural co-ops statewide. Based in Palm Harbor.
Georgia Power, Oglethorpe Power, Georgia Transmission Corp, and the state's network of EMCs including Jackson, Cobb, Sawnee, and Greystone.
Alabama Power, TVA distributors in northern Alabama, and the Alabama EMC network including Black Warrior, Central Alabama, and Joe Wheeler.
Entergy Mississippi, Mississippi Power, and Cooperative Energy member co-ops including Coast Electric and Singing River Electric.
Duke Energy Carolinas, Dominion Energy SC, Santee Cooper, and the Central Electric Power Coop member system statewide.
Duke Energy Carolinas, Duke Energy Progress, Dominion Energy NC, ElectriCities municipal systems, and the EMC network statewide.
TVA distributor utilities including NES, MLGW, KUB, and Chattanooga EPB, plus county systems and cooperatives across all three grand divisions of the state.
When a job needs more than one specialist.
Most substation work touches more than one discipline. When a project calls for a capability outside what we cover in-house, NETA-accredited testing, specialized power-systems engineering, or scopes that benefit from an engineering peer on the bench, we bring in known partners. The list below is the actual short list, not a directory.
We machine the parts
we install.
When a repair stalls because a contact or component has been discontinued, we don’t wait on a supplier, we make it in our own machine shop, to OEM dimensional spec, with material certification available on request. Manufacturing utility components in Palm Harbor, FL since 1982. Most field crews can’t say that.
Built for the
utility world.
From investor-owned utilities to municipal power, cooperatives, industrial plants, renewables, and data centers, wherever there’s a substation, we supply the parts and the crews.
Keeping large T&D fleets in service.
A responsive, FMEA-member partner.
Parts for equipment the OEM dropped.
Uptime for plant substations.
Collector substations & tap changers.
Mission-critical power reliability.
Safety first,
on every site.
Working inside an energized substation leaves no room for shortcuts. Our crews follow utility safety requirements and work the right way on every job, and we keep our contractor-safety prequalification current with the platforms utilities rely on. Southern Switch & Contacts is an approved vendor for multiple utilities in both ISN (ISNetworld) and Avetta, so the compliance paperwork is already in place before we mobilize.
- Approved vendor in ISN (ISNetworld)
- Approved vendor in Avetta
- Prequalified for multiple utilities
- Experience Modification Rate (EMR): 0.82 (current through 12/11/2026)
- Experienced, safety-trained substation technicians
What to expect
when you call us.
From first contact to boots on site, here is how a typical field services engagement runs.
Tell us what you have and what’s happening. We’ll ask the right questions, equipment type, condition, voltage class, urgency, and site access. No intake forms, no ticket queue. A Southern Switch engineer picks up.
We put together a clear scope of work, what’s included, what equipment our crew brings, what you’ll need to have ready on site, and any access coordination required. If partner capabilities are needed, we say so upfront.
You get a written proposal with a firm price, expected crew size, timeline, and crew credentials. We do not throw a number at you and figure out the rest later. No scope surprises on site.
Crew dispatches with the right test equipment and tooling. We handle logistics, crane coordination where needed, and daily site safety compliance from day one. Test results and documentation are delivered with the job.
Field Work, Documented
Three projects that show how we operate in the field: crane coordination, emergency response, and circuit breaker replacement.
Four TECO power transformers elevated onto flood-hardened platforms. Southern Switch coordinated the crane, set the platforms, and performed complete apparatus testing before return to service.
Autotransformer failed in service. We sourced a compatible replacement, completed all transformer testing, and commissioned it back online to restore transmission capacity.
Aging oil circuit breaker at a TECO downtown Tampa substation replaced with a new SF6 unit. Crane coordination, breaker removal, installation, P&C cable, and commissioning.