Transformer oil regeneration
Transformers are devices used in electrical circuits to change the voltage of electricity flowing in the circuit. Transformers can be used either to increase the voltage (called “stepping up”) or decrease the voltage (“step down”). Petroleum based mineral insulating oil which is mostly used in power transformers carries diagnostic information about the state of transformer. Hence, the proper maintenance of insulating oil ensures the reliability of transformer. Due to thermal stress in the transformer, mineral insulating oil is subjected to oxidative degradation process in the presence of oxygen. Damage caused by degradation will destroy paper and maybe irreversible. Therefore, for improving the lifetime of transformers, used oil must be replaced with new one or it can be reclaimed.
Our transformer oil regeneration machine not only removes water, gases and solid particles but also eliminates or reduces soluble and insoluble polar contaminants from the oil. Niroonamad transformer oil regeneration process is a highly efficient method that is done onsite and can be performed on a live transformer. Additionally, this process can restore the oil like the new one condition based on IEC 60296 standard.
First of all, oil is filtered through a coarse filter to prevent any particles from entering the equipment.
It is then heated to the desired temperature to elevate the regeneration effect.
Oil is pumped through columns with sorbent media. In this step impurities and aging byproducts are removed from the oil.
Oil is then pumped through the degassing chamber where it is dehydrated and degassed.
Treated oil is then pumped back to the transformer by the outlet pump. It must be considered after a given period, sorbent achieves full saturation and is no longer able to regenerate oil.
At this stage, the sorbent needs to be reactivated (restored to its original state) to be able to regenerate oil again.
After the oil has been drained, a vacuum is created and maintained throughout the whole reactivation process. Then by selective use of heating elements on the top parts of individual columns, the reactivation process is initiated. During the process, the impurities are removed from the sorbent which restores it to its original state.
This entire process can be repeated many times until the sorbent starts to lose its properties and needs to be replaced.