Southern States Mobile Substation

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Overall reliability is a critical focus for utilities across North America, creating the need for solutions and equipment that can support the grid during times of emergency or occasional planned outages. Taking proactive measures to address these potential vulnerabilities is, therefore, vital to ensure a resilient network that minimizes customer interruption frequency and duration.

Southern States, with over 100 years experience integrating high voltage switching equipment, has worked to address this initiative by designing mobile solutions that are specifically tailored to our customer’s unique applications, providing immediate cost savings and reliability to a utility’s network via expedited restoration times and operational flexibility.

Leveraging our partnership with various ISO certified transformer manufacturers, Southern States has the resources to design or retrofit mobile substations that can be outfitted with Southern States’ or your preferred switchgear brands. Available up to 230 kV and 65 MVA, our mobile products are manufactured with stringent specifications, ensuring the design is robust, durable, and to the utility’s expectations. For additional applications, Southern States also offers auxiliary mobile solutions to support reactive power compensation, switchgear failures, as well as other utility resiliency initiatives. These include capacitor trailers, circuit switcher trailers, breaker trailers, disconnect switch trailers, reactor trailers, recloser trailers, and voltage regulator trailers to name a few. Each can be equipped with a variety of custom features such as racking mechanisms, hydraulic systems, turn tables, fences, and much more.

Key Features:

  • Mobile substations & application specific trailer configurations available

  • Designs utilize 3D modeling software as well as finite element analysis to validate structural integrity

  • All trailers are in compliance with DOT and various other regulatory standards

  • Racking mechanisms, turn tables, hydraulics, grounding systems, fences, and other customer solutions available

  • Relay protection controls and equipment available for remote operation and diagnosis

  • 24/7 hotline for after-sales support

  • ISO 9001:2015 certification scope includes the “design, sale, and service of mobile substation solutions.”

Recent projects

Rusk County - The mobile success team recently shipped another single trailer mobile substation design from our Hampton, GA facility to the great state of Texas! This lean, custom designed trailer solution will serve multiple electric cooperatives during emergency outages and planned maintenance among other applications.

 Features include:

  • SSLLC 138 kV 650 kV BIL CSH2-B 40kA horizontal circuit switcher,

  • SSLLC 26MVA 138 x 69 kV – 24.94 x 12.47 kV mobile power transformer from our sister company Northern Transformer Corporation,

  • SSLLC EasyLock™ racking systems for DOT compliance and ease of deployment,

  • SSLLC CM4-AE motor operator with remote operation through relay & control cabinet,

  • SSLLC designed battery cabinet, easy access pullout battery bank, & onboard battery charger,

  • SSLLC 27 kV 150 kV BIL 2000A PBO-2 hookstick LV disconnect switches w/ polymer insulators,

  • SSLLC designed heavy haul trailer made of A514 high yield strength steel, structural integrity validated by finite element analysis (FEA), air ride suspension, hydraulic stabilizers, wireless remote rear steerable axles – all w/ 18-inch ground clearance & 13’ 6” maximum overall height for DOT compliance,

  • SSLLC designed structures & grounding system to ensure operator safety,

  • Other equipment including LV cable reel trailer, station power transformers, dual voltage arrestors, LV vacuum circuit breaker (27 kV, 150 kV BIL, 2000A) with remote operation.

New Horizon

The Southern States team is proud to see our latest mobile substation exit the doors of our Hampton, GA facility! This lean, custom designed trailer solution features

  • a 30MVA transformer from our sister company Northern Transformer,

  • a three phase 123 kV Southern States CSH2-B circuit switcher with EasyLock™ rack out mechanism, as well as

  • a separate cable reel trailer to promote ease and speed of deployment.

Additional trailer features include:

  • fully integrated protection relaying and controls,

  • dual-voltage surge arresters,

  • potential and auxiliary transformers,

  • a low voltage vacuum circuit breaker, as well as

  • hookstick switches.

The trailer also utilizes red painted transit bracing clearly marked for location, UV resistant insulator padding, as well as bushing covers to ensure equipment is protected during transit.