Specification of Transformer and switchgear oil

Generally specific parameters of transformer oil and switchgear oil, along with some key parameters are commonly associated with each other types of oils. Transformer Oil: 1. Dielectric Strength: This is a crucial parameter for transformer oil. It measures the oil's ability to withstand electrical stress without breaking down. 2. Flash Point: The flash point is the lowest temperature at which the oil vapors can ignite in the presence of an open flame or spark. It indicates the oil's fire resistance. 3. Pour Point: This parameter indicates the lowest temperature at which the oil can still flow. A low pour point is essential for applications in cold climates. 4. Viscosity: Transformer oil should have appropriate viscosity to ensure efficient cooling and heat dissipation within the transformer. 5. Moisture Content: Moisture in transformer oil can lead to reduced dielectric strength. Keeping moisture levels low is critical for optimal transformer performance. 6. Acid Number: This measures the acidity of the oil. Higher acid numbers may indicate the presence of contaminants or degradation. 7. Color: The color of transformer oil is often monitored as a change in color may indicate contamination or degradation.

Switchgear Oil: 1. Dielectric Strength: Similar to transformer oil, switchgear oil needs to have a high dielectric strength for effective insulation. 2. Flash Point: A high flash point is essential for switchgear oil to prevent the risk of fire during operation. 3. Pour Point: Just like in transformers, a low pour point ensures that the oil remains fluid at low temperatures. 4. Viscosity: Appropriate viscosity is crucial for switchgear oil to ensure proper lubrication and cooling. 5. Corrosive Sulfur Content: This parameter is important in sulfur-containing oils to prevent corrosion of metal components in the switchgear. 6. Oxidation Stability: Switchgear oil should resist oxidation to maintain its properties over time and ensure a longer lifespan. 7. Interfacial Tension: This measures the oil's ability to separate from water, which is crucial in applications where water ingress needs to be minimized. Specification of Transformer and switch gear oil 1) Density at 27 c gm/cm3 0.89 2) Kinematic Viscosity at 27 c max 27.0 3) Interfacial Tension at27 c N/m min 0.04 4) Flash Point (Pensy Mortien) closed o C 140 C 5) Pour point (Max) - 10 6) Corrosive Sulphur None 7) Neutralization value mg KoH/gm 0.03 8) Electric strength (breakdown voltage ) kV a) New untreated oil 30 b) After treatment 50 9) Dielectric dissipation factor at 90 c 0.005 10) Specific Resistance (Resistivity) a) At 90c minimum 13 X10 12 b) At 27 c maximum 500 x10 12 11) Oxidation Stability a) Neutralization value after oxidation mg KoH/gm 0.4 b) Total sludge after oxidation wt % 0.1 12) Presence of oxidation inhibitor none 13) Water content in ppm Max 50 It's important to note that specific standards and requirements may vary based on the type and design of transformers and switchgear, as well as regional regulations and industry standards. Always refer to the manufacturer's guidelines and relevant standards for accurate information. For prevention of oil corrosion inhibitors like zinc dithiophosphate and organometallic compounds are usually added to the lubricating oil