BS 148:2020 pdf 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 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 document.I For dated references, only the edition cited
applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ASTM E1687-10, 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 8) and d.c. resistivity
BS EN 60475, Method 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 61125:201 8, Insulating liquids – Test methods for oxidation stability – Test method for evaluating the oxidation stability of insulating liquids in the delivered state
BS EN 61198, Mineral insulating oils – Methods for the determination of2-firfural and related compounds
BS EN 61619, Insulating liquids – Contamination by polychlorinated biphenyls (PCBs) – Method of determination by capillary column gas chromatography
BS EN ISO 12185, Methods of test for petroleum and its products – Crude petroleum and petroleum products. Determination of density. Oscilating 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.
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
3.8 re-refined oil
recycled oil which has been subjected to a process similar to that used for the production of unused oil from virgin feedstock to reduce the level of undesired compounds.BS 148 pdf download.