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Online Measurement of Transformer Oil MoistureIn transmission and distribution networks, knowledge of transformer oil moisture levels is absolutely vital. High moisture levels can lead to low dielectric strength, decreased insulation, and even a breakdown of this single-most expensive substation asset.

Scheduled oil sampling, the most common practice in use today, can be very time consuming and the results can even be misleading as the moisture levels can change rapidly.

Only with online monitoring, can you get up-to-date information about all conditions the transformer is exposed to, making it easy to plan condition-based maintenance (CBM).

Read the application note on transformer oil moisture monitoring and you will gain knowledge of
  • moisture dynamics
  • water absorption behavior and
  • the benefits of online transformer oil moisture monitoring.


  • Get help from Vaisala's trained application sales engineers. Find your local contact here.
  • More information www.vaisala.com/power

Online Measurement of Transformer Oil Moisture