IEC 60296-2003 pdf – Fluids for electrotechnical applications – Unused mineral insulating oils for transformers and switchgear

IEC 60296-2003 pdf – Fluids for electrotechnical applications – Unused mineral insulating oils for transformers and switchgear.
1 Scope This International Standard covers specifications and test methods for unused mineral insulating oils. It applies to oil delivered to the agreed point and time of delivery, intended for use in transformers, switchgear and similar electrical equipment in which oil is required as an insulant and for heat transfer. These oils are obtained by distillation and refining of crude petroleum. Oils with and without additives are both within the scope of this standard. This standard is applicable only to unused mineral insulating oils. Reclaimed oils are beyond the scope of this standard. This standard does not apply to mineral oils used as impregnants in cables or capacitors. NOTE Mineral insulating oils complying with the requirements of this standard, of the same class and containing no additives (see 3.4), are considered to be compatible with one another and can be mixed in any proportion. This does not apply to oils containing additives. Where the user wishes to mix such oils, a check is recommended to be made to ensure that the mixture meets the requirements of this standard. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60076-2, Power transformers – Part 2: Temperature rise IEC 60156, Insulating liquids – Determination of the breakdown voltage at power frequency – Test method IEC 60247, Measurement of relative permittivity, dielectric dissipation factor and d.c. resistivity of insulating liquids IEC 60422, Supervision and maintenance guide for mineral insulating oils in electrical equipment IEC 60475, Method of sampling liquid dielectrics IEC 60628, Gassing of insulating liquids under electrical stress and ionization IEC 60666, Detection and determination of specified anti-oxidant additives in insulating oils
IEC 61125, Unused hydrocarbon based insulating liquids – Test methods for evaluating the oxidation stability IEC 61198, Mineral insulating oils – Methods for the determination of 2-furfural and related compounds IEC 61619, Insulating liquids – Contamination by polychlorinated biphenyls (PCBs) – Method of determination by capillary column gas chromatography IEC 61620, Insulating liquids – Determination of the dielectric dissipation factor by measurement of the conductance and capacitance – Test method IEC 61868, Mineral insulating oils – Determination of kinematic viscosity at very low temperatures IEC 62021-1, Insulating liquids – Determination of acidity – Part 1: Automatic potentiometric titration ISO 2719, Determination of flash point – Pensky-Martens closed cup method ISO 3016, Petroleum products – Determination of pour point ISO 3104, Petroleum products – Transparent and opaque liquids – Determination of kinematic viscosity and calculation of dynamic viscosity ISO 3675, Crude petroleum and liquid petroleum products – Laboratory determination of density – Hydrometer method ISO 6295, Petroleum products – Mineral oils – Determination of interfacial tension of oil against water – Ring method ISO 12185, Crude petroleum and petroleum products – Determination of density – Oscillating U-tube method ISO 14596, Petroleum products – Determination of sulfur content – Wavelength-dispersive X-ray fluorescence spectrometry
3.3 additive suitable chemical substance which is deliberately added to a mineral insulating oil in order to improve certain characteristics NOTE Examples include antioxidants, pour point depressants, electrostatic charging tendency depressants such as benzotriazole (BTA), anti-foam agents, refining process improvers, etc. 3.4 antioxidant additive additive incorporated in an insulating oil to improve oxidation stability NOTE A large number of antioxidant additives are available. For this standard, these are limited to those identified in IEC 60666. 3.5 uninhibited oil mineral insulating oil, containing no antioxidant additives, but which may contain other additives 3.6 trace inhibited oil mineral insulating oil containing up to 0,08 % antioxidant additive together with other additives as mentioned in 3.4 3.7 inhibited oil mineral insulating oil containing a minimum of 0,08 % and a maximum of 0,40 % antioxidant additive together with other additives as mentioned in 3.3 3.8 unused mineral insulating oil mineral insulating oil as delivered by the supplier NOTE Such an oil has not been used in, nor been in contact with electrical equipment or other equipment not required for manufacture, storage or transport. The manufacturer and supplier of unused oil will have taken all reasonable precautions to ensure that there is no contamination with polychlorinated biphenyls or terphenyls (PCB, PCT), used, reclaimed or dechlorinated oil or other contaminants. 3.9 reclaimed oil mineral insulating oil used in electrical equipment which has been subjected to chemical and/or physical processing to eliminate soluble and insoluble contaminants NOTE A blend of unused and reclaimed oil in any proportion is regarded as being reclaimed. 4 Properties of oil Characteristics are listed in Tables 1 and 2 and in Clause 7. 4.1 Functional properties Properties of oil which have impact on its function as an insulating and cooling liquid.