Why Transformer Oil Leaks

Transformer oil leakage is a common problem in oil immersed transformers. Even a small leak may affect insulation performance and transformer reliability.

Main Causes of Transformer Oil Leakage

1. Aging Sealing Gaskets

Transformer tanks and accessories use rubber gaskets to prevent oil leakage.

After long-term operation, gaskets may become hard, cracked, or lose elasticity due to:

• high temperature
• oil aging
• environmental conditions

Common sealing materials include NBR, FKM, and silicone rubber.

2. Loose Connections

Transformer accessories are connected by bolts and flanges.

Long-term vibration and thermal expansion may reduce sealing pressure, causing oil leakage around:

• Реле Бухгольца
• индикатор уровня масла
• втулки
• клапаны

3. Damaged Accessories

Oil leakage may also come from transformer accessories.

Например, damaged seals inside an oil level indicator or Buchholz relay can cause oil loss.

Regular inspection helps identify leakage problems early.

How to Reduce Transformer Oil Leakage?

Reliable sealing materials and high-quality transformer accessories are important for preventing oil leakage.

During maintenance, engineers should check:

• gasket condition
• oil level changes
• accessory connections
• leakage marks

Proper maintenance can extend transformer service life and improve operating safety.