鈴木 拓真

The density of Nynas transformer oil typically ranges from 0.85 to 0.90 g/cm� at 20�C. This density is crucial for ensuring proper insulation and cooling properties in power transformers. The specific density can vary slightly depending on the formulation and additives used in the Nynas transformer oil, but it generally falls within this range, making it suitable for effective performance in electrical applications.

The transformer oil filtration process involves several key steps to ensure the removal of impurities and moisture from the transformer oil. Initially, the oil is heated to reduce viscosity, followed by a vacuum treatment to extract dissolved gases. Filtration systems utilize various media to capture particulate matter. Finally, the treated transformer oil is tested for dielectric strength and moisture content to ensure it meets the required specifications for optimal performance in power transformers.

The Indian standard for transformer oil filtration is IS 335:2018, which specifies the requirements for new insulating oils for transformers. This standard outlines the testing methods and quality parameters necessary for transformer oil filtration to ensure optimal performance and safety. You can find the PDF of IS 335:2018 on the Bureau of Indian Standards (BIS) website or through authorized distributors of Indian standards documents.

Online filtration connects to the transformer oil circuit and continuously processes a portion of oil while the transformer remains energized. The system removes moisture, gases, and particles under controlled flow and pressure, returning treated oil to the tank. This maintains oil quality without outages, improves reliability, and is used for critical transformers where shutdowns are costly.

Containment design aims to prevent oil reaching soil or water during leaks, failures, or fire. Key requirements include a bunded area or pit sized for at least the full oil volume (often plus rain allowance), impermeable liners, drainage control with oil water separators, fire safe layouts, and easy access for cleanup. Substations often use gravel layers to reduce pooling and support fire suppression, plus monitoring for sump levels. Local environmental rules determine exact capacity, materials, and reporting obligations.

Containment requirements typically include secondary containment sized to capture expected spill volume, impermeable surfaces, drainage control, and measures to prevent oil from reaching soil or waterways. Substations often use bund walls, oil pits, sumps, and separators. Fire safety spacing and barrier requirements may also apply. Local environmental rules and utility standards usually define exact sizing, materials, and inspection routines.

Modern transformers use mineral oil, natural ester oils such as FR3 and Biotemp, synthetic ester oils like MIDEL, and silicone oils. Mineral oil is most common due to cost and performance balance. Ester and silicone oils are selected for higher fire safety, biodegradability, and use in indoor or environmentally sensitive locations.

A color chart provides a quick visual indicator of oil darkening, which can correlate with oxidation, contamination, or the presence of sludge and degradation byproducts. Lighter color generally suggests newer or cleaner oil, while darker oil can indicate aging, overheating, or dissolved contaminants. However color alone is not diagnostic. Some oils darken while still meeting key dielectric properties. Therefore color observations should be paired with lab tests such as acidity, interfacial tension, moisture, and DGA to confirm actual insulation health.