Oil-Immersed Transformers: Model Analysis and Application Guide

What is an Oil-Immersed Transformer?

An oil-immersed transformer is a type of power transformer where the windings are submerged in insulating oil, which provides excellent electrical insulation and heat dissipation to ensure safe and stable operation. These transformers are widely used in power systems, industrial production, and infrastructure, serving as a critical component in transmission and distribution networks.

Common Oil-Immersed Transformer Models Explained

Understanding the model codes of oil-immersed transformers helps users quickly identify product characteristics:

1. S-Series Oil-Immersed Transformers

• S9/S11/S13: Energy-efficient series, where the number indicates the design era (e.g., S9 represents 1990s design).
• Features: Low no-load loss, high operational efficiency, meeting modern energy-saving requirements.
• Applications: Urban and rural grid upgrades, industrial and mining power distribution.

2. SC(B)-Series Resin-Insulated Oil-Immersed Transformers

• SCB10/SCB11: Hybrid technology combining dry-type and oil-immersed insulation.
• Features: Excellent fire resistance, easy maintenance.
• Applications: High-rise buildings, subways, and other locations with high fire safety requirements.

3. SF-Series Sealed Oil-Immersed Transformers

• SF6/SF8: Fully sealed structural design.
• Features: Maintenance-free, resistant to moisture and dust.
• Applications: Harsh environments such as humid or dusty areas.

Advantages of Oil-Immersed Transformers

1. Superior Heat Dissipation: Insulating oil effectively dissipates heat generated during operation.
2. Reliable Insulation: Oil medium provides excellent electrical insulation.
3. Cost-Effective: More economical compared to dry-type transformers.
4. Long Service Life: Can last 20-30 years with proper maintenance.
5. Strong Overload Capacity: Suitable for short-term overload conditions.

Key Considerations When Purchasing Oil-Immersed Transformers

1. Select Capacity Based on Load Characteristics: Consider both normal and peak demand.
2. Pay Attention to Energy Efficiency Class: Higher-efficiency models may have a higher initial cost but offer long-term savings.
3. Evaluate Installation Environment: Choose outdoor or specially protected models for different conditions.
4. Ease of Maintenance: Opt for brands with reliable after-sales service.
5. Compliance with National Standards: Ensure products meet relevant certifications and tests.

Maintenance Tips for Oil-Immersed Transformers

1. Regularly check oil levels and oil quality.
2. Monitor operating temperature.
3. Inspect sealing performance to prevent leaks.
4. Conduct periodic insulation tests.
5. Clean dust from radiator surfaces.

Conclusion

Oil-immersed transformers remain a dominant choice in power systems due to their reliability and cost-effectiveness. Understanding the features and applications of different models helps users make informed decisions. With technological advancements, modern oil-immersed transformers have also made significant progress in energy efficiency and environmental protection, making them a preferred solution for power infrastructure.

For more details on technical specifications or pricing of specific oil-immersed transformer models, please consult professional transformer suppliers.