BS EN IEC 60296:2020 pdf free.Fluids for electrotechnical applications – Mineral insulating oils for electrical equipment.
BS EN IEC 60296 This document provides specifications and test methods for unused and recycled mineral insulating oils (see Clause 3 for definitions). It applies to mineral oil delivered according to the contractual agreement， intended for use in transformers, switchgear and similar electrical  equipment in which oil is required for insulation and heat transfer. Both unused oil and  recycled oil under the scope of this document have not been used in, nor been in contact with electrical equipment or other equipment not required for manufacture, storage or transport. Unused oils are obtained by refining, modifying and/or blending of petroleum products and other hydrocarbons from virgin feedstock. Recycled oils are produced from oils previously used as mineral insulating oils in electrical equipment that have been subjected to re-refining or reclaiming (regeneration) by processes employed offsite. Such oils will have originally been supplied in compliance with a recognized unused mineral insulating oil specification. This document does not differentiate between the methods used to recycle mineral insulating oil. Oils treated on-site (see IEC 60422) are not within the scope of this document. Oils with and without additives are both within the scope of this document. This document does not apply to mineral insulating oils used as impregnating medium in cables or capacitors.Uninhibited oils are typically made from base oil(s) with the aim to retain a balance of removable components, some of which are easily oxidized, while others provide some protection against the normal oxidation process. The refining process is optimized to retain certain sulphur and aromatic compounds which act as natural antioxidants. However, since the natural antioxidants are not as effective as synthetic antioxidants, the uninhibited oils will exhibit less oxidative stability compared to inhibited oils. Uninhibited oil contains a certain amount of so called natural antioxidants, some of them present from the beginning (mostly sulphur-containing acting as secondary antioxidants), others being formed as intermediates by oxidative processes (mostly oxidation of aromatic compounds then acting as radical scavengers). Inhibited oil is a blend of base oil(s) with a synthetic antioxidant. The additive response and the resulting oxidation stability of the inhibited oil depends very much on the refining severity. The antioxidant is added to control the oxidation processes.’ The inhibitor acts as radical scavenger and protects the base oil hydrocarbons – depending on the degree of refining – from oxidation. Oils with very high oxidative stability are inhibited oils and can be achieved by blending very severely treated base oil and antioxidant.BS EN IEC 60296 pdf download.