Key Advantages:
Excellent Insulation Performance: The insulating oil provides dielectric strength far exceeding that of air, allowing for more compact transformer designs and very high voltage levels (up to UHV).
High Heat Dissipation Efficiency: The oil's high specific heat capacity and good fluidity effectively carry away and dissipate heat, allowing the transformer to handle greater loads.
Mature and Reliable Technology: Over a century of application history, with extremely rich experience in design, manufacturing, operation, and maintenance.
High Cost-Effectiveness: Initial investment is typically lower compared to dry-type transformers of the same capacity.
Long Service Life: With proper sealing and maintenance, the service life can reach 20-30 years or even longer.
Comprehensive Fault Protection: Through technologies such as oil chromatography (DGA), latent internal faults (such as localized overheating and discharge) can be effectively monitored.
Oil-immersed transformers have long dominated the fields of high-voltage, high-capacity power transmission and distribution due to their superior insulation and heat dissipation performance, high reliability, and economy. Despite challenges related to fire prevention and environmental protection, they remain an indispensable key piece of equipment in modern power grids through technological improvements (such as the use of high-flash-point synthetic ester insulating oil) and comprehensive protection measures. In locations requiring fire protection, explosion protection, or where space is limited, dry-type transformers are a more suitable choice.
