BS 148-2020 pdf free download.Recycled mineral insulating oil for transformers and switchgear — Specification
1 Scope
This Briti’.h Standard specilies requirements for recyded oxidation inhibited and uninhibited mineral insulating oils. as delivered, for Lise in transformers, switchgear and similar electncal equipment in which oil is required as an insulant and/or for he-at transfer.
Oils with and without additives are within thr. scope of this standard,
This standard does not dilierentiate between methods used to recycle used mineral insulating oil. thus recLaimed or regenerated oil, re•reIined 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 Otis conforming to the reouarenwnts of this srandord. and containing no additives, ore considered to be componble with one another and can be mixed many proportion This does not necessarily appty to oils containh’W additwex arid where the user wishes to mx such oils a check should be made to ensure that the mixture coriforms to the requirements sithit 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 documenL For dated references, only the edition cited applies. For undated reFerences, the latest edition of the referenced document (induding any amendments) applies,
ASTM E1687• 10, Standard teat method for determining carcinogenic potential of virqin base oils in metalworking fluids
KS EN 60156, Insulating liquids – Determination of the breakdown voltage at power frequency. Test method
KS EN 60247, Insulating liquids – Measurement of relative permit-tivit,ic dielectric dissipation factor (tan 6) and d.c. resistivity
BS EN 60475, Method for sampling liquid dielectrics
KS EN 60666, DtectAon and determination of specified additives in mineral insulating ails
KS EN 60814. Insulating liquids – Oil•impregnated paper arid pressboard. Determination of water by automatic coulometric’ Karl Fischer titration
BS EN IEC 61125:2018, Insulating liquids – Test met hods for oxidation stability – Test met hod for rvaluating the oxidation stability of insulating liquids in the delivered state
KS EN 61198, Mineral insulating oils – Met hodsfór the determination of Z.furfurrsl and related compounds
KS EN 61619. Insulating liquids – Contamination bypolychlorinated biphenyls (PCIJs) – Method of determination by capillary column gas chromatography
KS EN 62021-1, Insulating liquids – Determination of acidity – Part 1Automatic potentiometric titration
KS EN 6202 1-2, Insulating liquids – Determination of acidity – Part Z; Colourimefric titration KS EN 62535. Met hod for detection of potentially corrosive sulfur in used and unused mineral insulating oils
3 Terms and definitions
For the purposes of this British Standard, the fllowing 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
3.5unused 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.
3.7reclaimed (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
NOTE Such rerefined oils are often produced /rom mitures of mineral insulating oils of diferent origins induding presses such as ditilation and hydrotretment
3.9 reconditioned oil
recycled oil which has been subjected to a physical process to remove insoluble contaminants and free water and to reduce the levels of dissolved moisture and gases
3.10 dechlorinated oil
recycled oil which has been subjected to decontamination from PCBs
3.11 additive
suitable substance added to an insulating liquid to improve certain characteristics
3.12 anti-oxidant
additive incorporated into an insulating liquid to reduce or delay its degradation by oxidation
3.13 metal deactivating agent
additive introduced to suppress catalytic activity of metals in insulating liquid; classified into two major groups, either passivators or chelating agents
NOTE In redcing the crtalytic activity. metal deactivutor might have an antixidont f.
3.14 passivator
metal deactivating agent incorporated into an insulating liquid to reduce the chemical reactivity of metallic surfaces within oi-filled equipment
3.15 pour point depressant
additive that enables the pour point of a mineral insulating oil to be lowered
4 Identification and delivery
4.1 Road or rail tank wagons and drums used for the delivery of oil shall be speclally cleaned for this purpose.BS 148 pdf download.