What is the acceptable water ppm level in transformer oil for power transformers?

The acceptable water ppm level in transformer oil for power transformers is typically less than 30 ppm. Water presence in transformer oil can lead to insulation degradation and reduced dielectric strength. Maintaining water levels below this threshold is crucial for ensuring the longevity and reliability of the power transformer, as excessive moisture can accelerate aging and compromise performance. Regular monitoring and maintenance are essential to achieve this standard.