Power Transmission

SESCO is a leading provider of quality, innovative systems for the Power Transmission industry.

Industry Solutions

  • SES320 Insulating Oil Processing Equipment

    The SES320 family of stationary and mobile vacuum oil purifiers are used to prepare dielectric fluids for service, as well as vacuum dry and fill high voltage oil cooled equipment. After 30 years of production, the SES320 family can be found in power generation, transmission, distribution and transformer manufacturing industries world-wide. 
  • SES441 Substation Maintenance Trailers

    Custom mobile insulating oil filtration systems are available for less-demanding low-volume applications where dissolved gas contamination is not an issue. The SES441 series uses single or multi-stage filtration to remove, particulate, free water, and small quantities of dissolved water if necessary. The systems are usually customized to suite the specific customer application.
  • Transformer Vacuum Dry-out Systems

    The SES420 family of two stage vacuum packages are targeted at transformer dry out applications but can be custom engineered for other industrial applications on request. The SES420 series is packaged in four standard size ranges  and are available as stand-alone skids, stand-alone cargo trailer packages, and SES320 oil processor integrated.  
  • SES329 Transformer Back Fill Dry Air Systems

    The SES329 series of mobile and stationary dry air generation systems are targeted for transformer back fill applications and are often purchased as accessories with our SES320 oil processing equipment. Non-certified and certified class "D" breathing quality options are available .
  • Fullers Earth Systems

    The SES522 Adsorbent Treatment Systems (Fullers Earth) remove polar contaminants such as acids, oxidation by-products, and color bodies from numerous fluids. The bulk media  systems can be used for stand-alone treatment or in conjunction with the SES320 conditioning system to regenerate badly degraded ISO class III insulating fluids and with multiple passes, "desludge" badly contaminated transformers. The SES522 systems are available in three tower sizes as well as in dual and single tower configurations.
  • SES328 Transformer Evacuation Vacuum Line Cold Traps

    The SES328 family of vacuum line cold traps are targeted as tool to help quantify the rate and volume of water extraction during the transformer vacuum dry out process. Refrigerated and liquid nitrogen trap cooling options are available.   
    Vacuum Line Cold Traps

    SESCO Vacuum Line Cold Traps measure the rate and quantity of water removed during transformer vacuum dry out. Oil processor integrated, stand alone, and portable versions are available.

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    The SES328 family of vacuum line cold traps are targeted as tool to help quantify the rate and volume of water extraction during the transformer vacuum dry out process. The sublimated water vapor condenses and frezes when it contacts the trap extreme cold  surface. An extraction rate is determined by periodiclydefrosting to melt the ice and measuring the collected water over a given time period. Refrigerated and liquid nitrogen cooled traps are available. Single stage refrigerated traps are used for trapping between vacuum pump stages. Liquid nitrogen and two stage (Cascade) refrigerated systems are cold enough to trap at evacuation pressures.
    SES328 Highlights  High-Efficiency Trap Design  Standard Bypass for Continuous Evacuation Stainless Steel Trap Construction Low-pressure Drop Design   Condensing Action Enhances Dryout Process


    SES328N-9.25-BP Liquid Nitrogen Cooled Vacuum Line Water Vapor Cold Trap  Portable - Dolly Mounted High Efficiency  (-195°C)  9.25 L N2 capacity 2.8L Average Trapping Capacity Standard Vacuum Line Bypass Piping Assures Continuous Evacuation. Convenient Two Wheel Portable Design Available in 3" & 4" Vacuum Connections Manual Timble Defrost Redundant Timble Optional  Safety Accessories & N2 Dewer Dispensing Hose Standard
    The liquid nitrogen cold trap uses bottled liquid nitrogen as a chilling media to provide the necessary vapor trapping surface temperatures. The extracted water and oil vapors are trapped on the surface of a liquid nitrogen-filled thimble. At measuring intervals, the thimble is removed. Ice is collected thawed for water measurement. A trap bypass line permits continuous evacuation during measuring cycles. The nitrogen trap is inexpensive, small, efficient, and maintenance free but must be defrosted manually. Handling the liquid nitrogen is very easy and safe with the standard protective clothing provided.

    SES328R  Standalone and system integrated refrigeration system cooled vacuum line water vapor cold traps. -80°C Trapping Temperature - (Two Stage Cascade) -43°C Trapping Temperature - (Single Stage)  Automatic Defrost Cycle Standard Vacuum Line Bypass Piping Assures Continuous Evacuation.
    Refrigerated cold traps are available with single and two-stage refrigeration systems. Traditional two-stage "cascade" systems produce trapping temperatures of ~-80°C and efficiently trap water vapor at pressures as low as 0.15 torr.  Cascade traps should be positioned at the inlet of the vacuum booster pump. Less expensive and complex single stage refrigeration system traps are available. Single stage traps produce trapping temperatures of ~-45°C and efficiently trap water vapor at pressures as low as 0.5 torr.  It is recommended that single stage traps be positioned between the vacuum backing pump and the booster where the pressure remains high enough to trap through the entire evacuation pressure range.  Automatic defrost cycles are included on both versions. The cascade version provides colder surface temperatures making it more efficient at lower pressures. Both systems must be mounted in a separate trailer or packaged with the oil processor trailer. 

    The SES328R refrigerated cold trap can be stand-alone skid mounted, stand-alone cargo trailer mounted or when van mounted integrated into the external vacuum line of a SES320 conditioning system.    

  • Oil Booster Heating Systems

    The SES460-2400  booster oil heating system is a versatile oil heating tool designed to aid oil processing in cold weather transformer installation and maintenance.  The SES460-2400 can be set up to boost oil processor return or supply temperatures. It also can be being used as a stand-alone 40 GPM heating circulation system for preheating transformers and storage tanks in cold conditions. The variable speed positive displacement pumping system tops out at 40 GPM.  Three individually controlled 32 kW low watt density heating banks provide 96 kW of heating capacity.  When supplied by an oil processor (or pump) a pump bypass circuit is provided to allow the system to be used as a push through heating system.  A  weather-protected NEMA 4X control panel is provided.