BS 148:2009 - Reclaimed mineral insulating oil for transformers and switchgear. Specification – BSI British Standards

BS 148:2009

Reclaimed mineral insulating oil for transformers and switchgear. Specification

Status : Current, Project Underway   Published : February 2009



BS 148:2009 Reclaimed mineral insulating oil for transformers and switchgear. Specification

BS 148:1998 was the specification for unused and reclaimed mineral insulating oil for transformers and switchgear. The specification for unused mineral insulating oil is now covered in BS EN 60296. Due to the continued market requirement for reclaimed oil to an agreed specification, BS 148 is now dedicated to reclaimed mineral insulating oil only.

BS 148 specifies requirements for reclaimed 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 or for heat transfer. Oils with and without additives are within the scope of this standard.

BS 148 does not differentiate between the methods used to reclaim used mineral insulating oil; thus it is also applicable to oils having undergone a re‑refining process.

BS 148 gives guidance on:

  • Identification and delivery 
  • Sampling 
  • Properties of the oils 
  • Test methods.

This standard does not apply to mineral insulating oils used as impregnates in cables or capacitors, or to hydrocarbon insulating liquids obtained by synthesis.

BS 148:2009 supersedes BS 148:1998, which is withdrawn.

Standard NumberBS 148:2009
TitleReclaimed mineral insulating oil for transformers and switchgear. Specification
StatusCurrent, Project Underway
Publication Date28 February 2009
Confirm Date01 July 2014
Normative References(Required to achieve compliance to this standard)BS EN IEC 61125:2018, IEC 60475, BS EN 60156:2018, BS EN 60247, BS EN ISO 2719, BS EN 62021-2, BS 5984, BS EN 60814, BS 2000-160, BS EN 61619, BS EN ISO 3104, BS 5263, BS EN 61198, BS EN ISO 3675, BS EN 60156, BS EN 62021-1, BS 2000-15, BS EN 62535
Informative References(Provided for Information)BS EN 60296, BS EN 17085:2019
ReplacesBS 148:1998
Draft Superseded By08/30167496 DC
DescriptorsAcidity, Liquid electrical insulating materials, Switchgear, Sludge, Transformers, Re-usable, Flash point, Pour point, Furan, Density, Oxidation resistance, Viscosity, Marking, Polychlorinated biphenyls, Chemical analysis and testing, Electrical insulating materials, Electrical equipment, Moisture, Insulating oils, Mineral oils, Breakdown voltage, Neutralization index, Dissipation factor, Kinematic viscosity
Title in FrenchSpecifications pour les huiles minerales isolantes regenerees pour transformateurs et appareillages de commutation
Title in GermanSpezifikation fuer regeneriertes Mineralisolierungsoele fuer Transformer und Schaltgetriebe
ISBN978 0 580 59225 6
File Size764 KB

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