What is the recommended threshold of water contamination in transformer oil?

The recommended threshold for water contamination in transformer oil is generally considered to be between 0.003% and 0.005%. This range is important because water contamination can lead to several detrimental effects on the performance and lifespan of the transformer. Water in transformer oil can significantly decrease the dielectric strength of the oil, potentially leading to insulation failure. Furthermore, elevated levels of water can promote oxidation and the breakdown of insulating materials, which can cause serious operational issues.

Maintaining water contamination within this recommended threshold helps ensure the reliability and safety of transformers, supporting effective operations in electrical systems. Keeping water levels in check can prevent costly failures and ensure that system performance meets regulatory and operational standards.