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Oil Filtration System->

Transformer Dry_Out Systems


Dehydrate wet transformers without taking them out of service!


  • Dry wet transformers and insulation
  • Dry transformers not braced for vacuum
  • Dry transformers that cannot be taken out of service


  • Transformer remains in-service during process
  • Reduce transformer dry-out costs
  • Improve oil dielectric values
  • Improve transformer power factor
  • Operates continuously unattended
  • Extend oil service life
  • Extend transformer service life

The TDS® transformer dry-out system incorporates all the necessary features to allow a transformer to remain in-service while moisture from its insulation is effectively removed. The system is safe with several alarm features that shut the system off, isolating it from the transformer,
in the event of any abnormal signal. The TDS5-1 unit provides a non-intrusive, cost effective and convenient method of maintaining transformers in a dry condition. In addition, once the transformer is dried, the system can be retrofitted with Activated Alumina cartridges to reduce acidity in the transformer oil. This flexibility allows increased oil processing application compared to heat and vacuum systems.

The TDS® oil processing system is designed to allow a transformer under load to dry itself out. A quantity of four part number SD-1107 Superdri® cartridges are installed in the filter vessel, through which oil is processed at a rate of 5 gpm. The filtering system removes dissolved water from oil to less than 10 ppm, and includes 1 micron nominal particle removal capabilities. The process does not affect dissolved gas in oil, and does not remove oil oxidation inhibitors. The system is complete with all components necessary to monitor the mechanical and electrical operating conditions of the unit. The system includes components to purge air during start up and after filter changes.

The on-line dryout process is designed for safe, unattended, 24-hour operation. The system suction line is connected to the transformer bottom fill connection. The oil is then returned from the TDS® to a top connection valve. The number of cartridge changeouts required to dry the transformer insulation to an acceptable level and cartridge change-out intervals will vary according to moisture content and moisture transfer rate from the insulation to the oil. One set of Superdri cartridges will remove a minimum of 1.4 gallons of dissolved water from the oil. Periodic moisture readings, from both the inlet to and outlet from the system can be taken to determine the amount of moisture being removed and are also used to determine when cartridges should be changed.










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