BS 148:2020 pdf free.Recycled mineral insulating oil for transformers and switchgear Specification.
BS 148 Scope 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 of 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 of this 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 of this 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 documcnt.U For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ASTM El 687-10, Standard test method for determining carcinogenic potential of virgin base oils in metalworking fluids
BS EN 60156, Insulating liquids – Determination of the breakdown voltage at power frequency. Test method
BS EN 60247, Insulating liquids – Measurement of relative permittivity. dielectric dissipation factor (tan ö) and d.c. resistivity
BS EN 60475. Met hod for sampling liquid dielectrics
BS EN 60666, Detection and determination of specified 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 61125:2018, Insulating liquids — Test methods for oxidation stability — Test met hod 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.BS 148 pdf download.