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Types of oil filtration from below.
Streamline purifier
Centrifugal purifier
Both
None of above
Both
Transformer oil filtration is the process of removing contaminants such as moisture, sludge, and solid particles to restore the dielectric strength of the insulating oil. Both Streamline and Centrifugal purifiers are standard industrial methods used for maintaining the quality of transformer oil in power systems.
Transformer oil filtration is the process of removing contaminants such as moisture, sludge, and solid particles to restore the dielectric strength of the insulating oil. Both Streamline and Centrifugal purifiers are standard industrial methods used for maintaining the quality of transformer oil in power systems.
FcтАЛ=m╧Й2r тАФ Represents centrifugal force used for separation
P=AFтАЛ тАФ Represents the pressure differential principle in filtration
The Centrifugal purifier uses centrifugal force to separate liquids of different densities (e.g., oil and water) and solid impurities, while the Streamline purifier typically utilizes a combination of heating, vacuum treatment, and edge-type filtration to remove moisture and dissolved gases from the oil.
Transformer oil acts as both an electrical insulator and a cooling medium.
Dielectric strength of oil decreases significantly with the presence of moisture and dissolved gases.
Centrifugal separators are highly effective for removing large volumes of free water.
Streamline filters are preferred for high-precision purification and degassing.
Increases the operational lifespan of the transformer insulation system.
Prevents internal arcing and dielectric breakdown.
Reduces downtime through efficient, on-site oil treatment.
Requires periodic monitoring and maintenance of filtration media.
Operational costs increase with frequent purification cycles.
Improper handling during filtration can introduce atmospheric moisture.
Power transformers in substations.
EHV and HV circuit breakers.
On-load tap changers (OLTC).
| Feature | Streamline | Centrifugal |
|---|---|---|
Mechanism | Vacuum/Heat/Edge-filtration | Centrifugal separation |
Dielectric strength of new transformer oil should typically be above 30 kV (as per IS 335).
Streamline purifiers are often multi-stage devices involving edge filters, heater, and vacuum chambers.
C is correct тАФ Both streamline and centrifugal purifiers are recognized industrial methods for purifying transformer insulating oil.
Always verify the oil's moisture content using the Karl Fischer titration method after filtration, as this is a critical check for transformer health in engineering competitive exams.