Advantages of Oil-Immersed Transformers Compared to Dry-Type Transformers

The advantages of oil-immersed transformers over dry-type transformers mainly include the following aspects:

1. Better Heat Dissipation Performance
   Oil-immersed transformers use insulating oil as both an insulating medium and a cooling agent. The oil has strong heat storage capacity, effectively distributing and absorbing heat, making them suitable for prolonged high-load operation. This is particularly important in high-temperature environments, ensuring stable transformer performance.

2. Stronger Overload Capacity
   Oil-immersed transformers can maintain stable operation under extreme weather conditions or short-term overload situations, whereas dry-type transformers may require emergency capacity reduction. This makes oil-immersed transformers more advantageous in applications requiring high reliability and overload tolerance.

3. Lower Maintenance Costs
   Although the initial procurement cost of oil-immersed transformers is 30%-50% lower than that of dry-type transformers, their maintenance costs are relatively lower. Oil-immersed transformers only require periodic oil quality checks and filter replacements, while dry-type transformers demand more maintenance work, such as dust removal and inspections.

4. Longer Service Life
   Oil-immersed transformers generally have a longer lifespan, typically lasting 20-40 years. In contrast, dry-type transformers, while capable of lasting 20-30 years, are more prone to aging under high-load conditions.

5. Suitable for High-Capacity and High-Voltage Applications
   Oil-immersed transformers are ideal for high-capacity and high-voltage scenarios, such as ultra-high-voltage power transmission and power plants. The insulating oil not only protects the windings but also ensures stable operation under extreme conditions.

This comparison highlights the key benefits of oil-immersed transformers, making them a preferred choice for demanding industrial and utility applications.