BS 148 pdf free download
BS 148-2020 pdf free download.Recycled mineral insulating oil for transformers and switchgear – Specification.
This British Standard specifies requirements for recycled oxidation inhibited and uninhibited mineral insulating oils, as delivered, for use in transformers, switchgear and similar electrical equipment in which oil is required as an insulant and/or for heat transfer.
Oils with and without additives are within the scope of this standard.
This standard does not differentiate between methods used to recycle used mineral insulating oil, thus reclaimed or regenerated oil, re-refined oil, dechlorinated oil and reconditioned oil are all considered recycled oil for the purposes o[this standard.
This standard does not apply to mineral insulating oils used as impregnates in cables or capacitors, or to hydrocarbon insulating liquids obtained by synthesis.
NOTE Oils conforming to the requirements ofthis standard, and containing no additives, are considered to be compatible with one another and can be mixed in any proportion. This does not necessarily apply to oils containing additives, and where the user wishes to mix such oils a check should be made to ensure that the mixture conforms to the requirements ofthis standard.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes provisions of this document) For dated references, only the edition cited applies. For undated references, the latest edition ofthe referenced document (including any amendments) applies.
ASTM E1687-1O, Standard test methodfor determining carcinogenic potential ofvirgin base oils in metalworking fluids
BS EN 60156, Insulating liquids – Determination ofthe breakdown voltage at power frequency. Test method
BS EN 60247, Insulating liquids — Measurement ofrelative permittivity, dielectric dissipation factor (tan 6) and d.c. resistivity
BS EN 60475, Methodfor sampling liquid dielectrics
BS EN 60666, Detection and determination ofspecifIed additives in mineral insulating oils
BS EN 60814, Insulating liquids – Oil-impregnated paper and pressboard. Determination of water by automatic coulometric Karl Fischer titration
BS EN IEC 61125:20 18. Insulating liquids — Test met hods for oxidation stability — Test method for evaluating the oxidation stability of insulating liquids in the delivered state
BS EN 61198, Mineral insulating oils – Met hods for the determination of2-furfural and related compounds
BS EN 61619, Insulating liquids – Contamination by polychiorinated biphenyls (PCBs) — Method of determination by capillary column gas chromatography
BS EN 6202 1-1, Insulating liquids — Determination of acidity — Part 1: Automatic potentiometric titration
BS EN 6202 1-2, Insulating liquids – Determination of acidity – Part 2: Colourimetric titration
BS EN 62535, Met hod for detection of potentially corrosive sulfur in used and unused mineral insulating oils
Documents that are referred to solely in an informative manner are listed in the Bibliography.
BS EN 62697-1, Test methods for quantitative determination of corrosive sulphur compounds in unused and used insulating liquids — Test method for quantitative determination of dibenzyldisulflde (DBDS)
BS EN IEC 62961. Insulating liquids – Test methods for the determination of interfacial tension of insulating liquids — Determination with the ring method
BS EN ISO 2719, Determination offlash point – Pensky-Martens closed cup method
BS EN ISO 3104, Petroleum products. Determination of kinematic viscosity and calculation of dynamic viscosity of transparent and opaque liquids
BS EN ISO 3675, Methods of testfor petroleum and its products – BS2000-160: Crude petroleum and liquid petroleum products. Laboratory determination of density – Hydrometer method
BS EN ISO 12185, Methods of test for petroleum and its products — Crude petroleum and petroleum products. Determination of density. Oscillating U-tube method
DIN 51353, Testing of insulating oils; detection of corrosive sulfur; silver strip test (Foreign Standard) ISO 2049. Petroleum products. Determination of colour (ASTM scale)
3 Terms and definitions
For the purposes of this British Standard, the following terms and definitions apply.
3.1 mineral insulating oil
insulating liquid obtained by refining, modifying and blending of petroleum products
3.2 uninhibited oil
mineral insulating oil to which no anti-oxidants or metal deactivating agents have been added but which might contain other additives
3.3 inhibited oil
mineral insulating oil containing an anti-oxidant
3.4 passivated oil
mineral insulating oil containing a metal deactivating agent
3.5 unused oil
mineral insulating oil, obtained by refining, modifying and/or blending of petroleum products and other hydrocarbons.
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.
3.6 recycled oil
mineral insulating oil previously used in electrical equipment that has been subjected to an off-site recycling process
NOTE A blend of unused and recycled oils in any proportion is regarded as being recycled oil.
3.7 reclaimed (regenerated) oil
recycled oil which has been subjected to chemical and physical processing to reduce soluble and insoluble contaminants.BS 148 pdf download.
