Velcon Transformer Oil Dehydration Systems

Transformer Dryout Systems

Advanced cartridge filtration equipment for insulating oils.

Velcon Transformer Dryout System Transformer Dryout System TDS5AB
Now wet transformers can be dehydrated without being taken out of service.
The TDS5AB 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 TDS5AB 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.

System Overview
The TDS5AB oil processing system is designed to allow a transformer under load to dry itself out. A quantity 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.
Process Overview
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 TDS5AB 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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Mobile Transformer Dryout Filter system Superdri® Filter System SDS20
Transformer Oil Dehydration System
The SDS20 Transformer Oil Dehydration System utilizes Velcon’s Superdri® technology to remove dissolved water from transformer oil. The dual stage unit processes oil to reach moisture levels of 10 parts per million of dissolved water or less in a single pass. The SDS20 can dramatically reduce oil filling costs by eliminating the need for costly heat and vacuum units to dehydrate transformer oil. The system is designed with all the necessary features required for critical transformer filling operations. These features help reduce downtime and eliminate added cost from sampling error, or from improper use of filter cartridges. ... 1802.pdf

Superdri Water Removal Cartridges Superdri® Cartridges SD Series

Remove Dissolved Water from Transformer Oil Reduce Moisture in Transformer Oil to <10 ppm Without Heat & Vacuum

Dissolved water removal from insulating oil is now possible without the need for heat and vacuum oil processing systems. Specifically developed for dehydrating oil to be used in transformers, patented* Superdri® cartridges can help utilities reduce expenses and increase efficiency when processing oil.
Applications:
Superdri® cartridges are designed for oil processing situations where dissolved water in insulating oil is a concern, and its removal is desirable. Examples of these situations follow: • New distribution and EHV transformers are typically oil-filled under vacuum. If the insulating oil has a high total water content, it is also processed through a heat and vacuum system. Superdri® cartridges can be used instead of heat and vacuum to dry the oil. • Repaired transformers are often oil filled under vacuum. Flowing the oil through Superdri® cartridges eliminates the need to vacuum process the oil. • Insulating oil in storage tanks, and tankers of oil that have accumulated a high level of dissolved water can be recirculated and dried to less than 10 ppm total water using Superdri® cartridges. • Use Superdri® cartridges for processing oil in other high voltage apparatus that is sensitive to dissolved water. • Use Superdri® cartridges to help meet processing specifications where dissolved water sensitive dielectric breakdown voltage test ASTM D-1816 is used, or required.
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