The HERING TIDO® Series of online transformer insulation dry out systems dry and degasify oil filled transformers of all sizes while the transformers remain energized. TIDO® is the ideal long-term maintenance solution after an initial oil purification using HERING EOK® has been performed. This way the HERING TIDO® extracts moisture and dissolved gasses from the online transformer continuously without causing any downtime in the transformer’s operation. The HERING TIDO® online transformer drying and degassing system avoids equipment failures by stopping the underlying causes of transformer failure. The paper insulation of a transformer will degrade with time through various chemical processes leading to equipment failure & explosion risks.