Transformer oil regenerationThe condition of paper insulation and the magnetic circuits of a transformer is what determines the length of its service life. There is no meaningful limit to the service life of the magnetic elements, but paper insulation is prone to stress and wear over time; making its condition the most important factor of transformer long term service. Normally, paper insulation ages over a long period of time, but the process can be significantly accelerated by heat, oxygen, water and the products of transformer oil oxidation. These products accumulate in the paper over time.
Oil Regeneration and Cleaning of Paper InsulationAs mentioned above, paper insulation traps and accumulates the products of transformer oil aging, acting as a filter for the oil. Changing the oil in the transformer is not a complete solution: as soon as the transformer is filled with new oil, the accumulated contaminants from the cellulose insulation are washed into and solved in the oil. These contaminants accelerate oxidation of oil, forming new deposits in the paper insulation, and the cycle repeats itself over and over again. As far as transformer life extension is concerned, changing the oil is not a radically beneficial solution. Neither is the process of taking the oil out of the transformer, regenerating it and returning it into the transformer tank: the end result is similar to that of simple oil change, with the only benefit being the lower cost of the procedure. The issue can be addressed, to a degree, during transformer overhaul. Flushing the paper with clean oil can remove much of the contaminants; however, the oxidation products deposited inside the paper are still difficult, if not impossible, to remove. Using special detergents helps, but these come at a significant cost and also make the process longer. To make the long story short, repairing the transformer and washing the paper insulation can cost as much as one third of an average new transformer price tag.
Oil Regeneration EquipmentThere is a method which deals with the above problems in a cost effective way: the GlobeCore CMM-R oil regeneration plants. One of the distinctions of these highly efficient systems is that they can process oil in an energized transformer. This capability makes the machine an ideal solution to the problem of paper insulation treatment. Operation of the CMM-R begins with connection to a powered transformer. The oil from the transformer passes into the unit for processing; the oxidation products are removed from the transformer with the oil, which undergoes regeneration and degassing processes. After the processing the oil goes back into the transformer, and the process is repeated in several cycles; the regenerated oil washes oxidation products from paper insulation. This cleaning process is enhanced by the high circulation rate, heat and vibration of the energized transformer, when contaminants are released from the paper into the oil and captured by the adsorbent in the unit when the oil is regenerated and degassed. The unit makes it possible to regeneration and purify transformer oil, at the same time cleaning the bulk of transformer paper insulation. The CMM-R also features the following advantages:
- Transformer life time extension
- Cellulose insulation cleaning, stopping the irreversible degradation caused by oxidation products and other contaminants
- Operation of the unit on energized transformers continuously
- The Fuller’s earth adsorbent inside the unit can be reactivated and reused, eliminating environmental concerns
- The loss of oil in the sorbent in the process of regeneration is minimized
- Oil regeneration and paper insulation treatment at the same time