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ON SITE FILTRATION
The importance of good quality oil makes it very important that all the equipments give their best performance. Transformers being key equipment, it becomes imperative to maintain optimal insulation properties of the transformer oils by rigid control over moisture, dissolved gases and particulate contamination. Failing in these results in considerable decrease in its BREAK DOWN VOLTAGE, INSULATION RESISTANCE, and increase in DIELECRIC LOSS FACTOR, leading to breakdowns of transformers. Conditioning saves the cost of using new oil frequently and also increases the life of the transformer. Even commercial new oil is seldom sufficiently pure for direct use in high voltage equipment, being subject to contamination in transport containers and liable to absorb unacceptable contaminants and moisture.
OIL FILTRATION AND CIRCULATION (MIN 3 CYCLE) CYCLE AS PER IS 1866-2000.
Field testing of Dielectric strength (BDV) of the Transformer Oil should be carried out in accordance with the provisions of IS 6792 & IS 1866 at regular interval during filtration job. The readings must be submitted to EIC for acceptance before stopping the filtration job.
The BDV test shall only be conducted after giving sufficient time for the oil to settle down after stoppage of the filtration process. Min BDV Value after completion of filtration and cooling down of oil should be min 60KV using 2.5MM gap electrode as per IS 6792 & PPM should be less than 20.
Removal of all suspended particles such as dust, rust, scales, colloidal carbon oxidation sludge etc. up to < 1 micron. Degassing and Dehumidification of Transformer Oil under vacuum. Circulation of heated Oil and Filling of treated oil in Transformer tank. De-acidification by evaporation and adsorption method.
Our single stage plants are capable of attaining following oil parameters in 3-4 passes and Two Stage Plants in 1-2 passes.
Mainly consists of inlet pump (Gear type positive displacement), Outlet pump (positive displacement Gear type or Multistage Centrifugal) and necessary valves & piping to ensure easy operation and maintenance. Complete system is vacuum tight to have a leak -proof operation.
It is suitable for removing suspended particles such as colloidal carbon, oxidation sludge, dirt, rust, scales up to < 1 micron. It consists of PRE FILTER and FINE FILTER.
It is a metallic strainer with magnet. It removes magnetic and coarse suspended particles and to protect inlet pump from damage due to abrasion.
Removes all suspended particles up to < 1 micron. Filter Elements are either non-hygroscopic molded cellulose cartridges or cleanable (with reverse airflow) edge type filter candles. Filter cartridges are easily replaceable. Additional Intermediate filter can be provided to increase life of fine filter.
It is designed to remove large portion of dissolved impurities (Including Moisture) from oil. Rasching ring trays and oil dispersing system are provided to have sufficient exposure of oil to vacuum during filtration. Oil level is controlled with float switch.
Rotary oil-sealed vacuum pump or combination of Mechanical Booster Pump and Rotary oil-sealed pump is provided to get proper working vacuum during filtration. Necessary valves for easy operation and maintenance of the plant.
- Ionic Reaction Column for acidity removal.
- Transformer Evacuation System.
- Filter Press as an intermediate filter to increase the cartridge life.
- Additional Instrumentation such as Temperature Indicating Controller, Flow Meter, On-line Oil Testing Equipment.
These plants are designed for filtration and dehydration of Power and Distribution Transformers and oil in tank. These plants can also be used for hot oil circulation in transformers and transformer drying.