The Difference Between Simple Purification and Regeneration / Reclamation
Simple purification focuses on removing physical contaminants from transformer oil, such as moisture, particles, and impurities, with the aim of improving its condition and insulating properties.
In contrast, Regeneration / Reclamation addresses a deeper level of oil degradation. It also targets oxidation products, acids, polar compounds, and sludge resulting from oil aging and chemical reactions during operation.
Therefore, filtration alone does not necessarily mean that the oil has been regenerated. If the degradation is caused primarily by moisture and physical contaminants, treatment may be sufficient. However, when the oil has undergone advanced chemical degradation, its restoration may require deeper treatment techniques such as Adsorbents, solvent refining, or hybrid treatment processes.
The study explains that transformer oil degradation does not occur due to a single factor, but rather as a result of several interacting mechanisms, including thermal oxidation, moisture, and metal-catalyzed reactions. These processes lead to the formation of acidity and oxidation products, the loss of some insulating properties, and the formation of sludge, which can accumulate on the core and windings, affecting oil circulation and cooling efficiency.
The study also indicates that this degradation can develop into a worsening cycle: it begins with oil deterioration and the formation of oxidation products and sludge. Their accumulation can then hinder cooling and cause localized temperature increases, which in turn accelerate further oil degradation. Therefore, modern Regeneration technologies focus on treating these degradation products rather than merely removing physical contaminants.
The study reviews several methods for restoring aged transformer oil, including Adsorbent-based reclamation, solvent-based purification, and hybrid systems. These treatments can improve a range of properties, including Breakdown Voltage (BDV), Dissipation Factor, viscosity, and flash point, although the results vary depending on the degree of oil degradation and the treatment method used.
At the same time, the study emphasizes that restoration is not always complete. Some molecular changes caused by aging are irreversible, meaning that treated oil may remain chemically different from new oil even after its condition has improved significantly. Therefore, the study considers Regeneration as part of the oil’s life-cycle management, rather than simply a method of returning it to the condition of new oil.
Refrences:
Adewunmi Adekunle & Oparanti, “Decay products and contaminants in transformer insulation: Mechanisms, dielectric impacts, and sustainable regeneration strategies,” Next Sustainability, 2026. [الدراسة على ScienceDirect](https://www.sciencedirect.com/science/article/pii/S2949823626000607?utm_source=chatgpt.com)