eristysöljyjä

Eristysöljyjä, also known as insulating oils or dielectric oils, are specially formulated oils used primarily in electrical equipment such as transformers and circuit breakers. Their main function is to provide electrical insulation, preventing short circuits and arcing. This is achieved due to their high dielectric strength, meaning they can withstand significant electrical stress before breaking down.

Beyond insulation, these oils play a crucial role in cooling. Electrical equipment generates heat during operation, and the circulating insulating oil absorbs this heat and dissipates it to the surrounding environment, often through radiators. This cooling function is vital for maintaining the operational integrity and extending the lifespan of the equipment.

Eristysöljyjä also serve a protective purpose by excluding moisture and contaminants from the internal components of electrical apparatus. Moisture can significantly reduce the dielectric strength of materials, leading to equipment failure. The oil acts as a barrier, keeping sensitive parts dry and clean.

The most common type of insulating oil is mineral oil, derived from petroleum. However, due to environmental concerns and evolving technical requirements, other types like synthetic esters and natural esters are also used, particularly in applications where fire safety and biodegradability are paramount. Proper maintenance, including regular testing of oil properties like dielectric strength, viscosity, and moisture content, is essential to ensure the continued reliable performance of the electrical equipment.