BS 148:2009 pdf free download – Reclaimed mineral insulating oil for transformers and switchgear – Specification.
3.9 re-refined oil
mineral insulating oil used in electrical equipment which has been subjected to extensive chemical and/or physical processing, similar to that used for the initial production of such oils, to eliminate soluble and insoluble contaminants
3.10 uninhibited oil
mineral insulating oil containing no added anti-oxidant but which may contain other additives
3.11 unused oil
mineral insulating oil which has not been used in, or been in contact with, electrical equipment or other equipment not required for manufacture, storage or transport
4 Identification and delivery
4.1 Road or rail tank wagons and drums used for the delivery of oil shall be specially cleaned for this purpose.
4.2 Oil drums and containers of oil samples shipped by the oil supplier shall carry at least the following markings:
a) supplier’s designation;
b) number and date of this British Standard, i.e. BS 148:2009 2)•
4.3 Each oil delivery shall be covered by a document from the supplier stating at least the following:
a) supplier’s designation;
b) function and generic nature of any additive present;
c) that the oil conforms to BS 148:2009.
4.4 Health and safety information, in line with current legislation,
shall be available to the purchaser.
5 Sampling
Sampling shall be carried out in accordance with BS 5263. NOTE As a general rule, oil samples should be taken where the oil is presumed to be more contaminated, e.g. at the lowest point of the container; however, contaminants at the surface or in the body of the oil should not be overlooked.
6 Properties of the oils
Uninhibited and inhibited oils shall be in accordance with the limiting values specified in Table 1 and Table 2, respectively, when tested in accordance with Clause 7.
The limits for water content, breakdown voltage and dielectric dissipation factor for oil packed in drums shall apply only to oils delivered in drums of 200 L nominal capacity and to tests carried out within two weeks following delivery.
NOTE 1 There is a tendency for water absorption to occur and for the electrical characteristics to deteriorate in oil stored in drums.
NOTE 2 Oil in drums cannot be expected to retain the breakdown voltage shown at the time of filling and attention is drawn to the risk of deterioration of electrical properties, which is greater in smaller drums (less than 200 L). It is recommended that the breakdown voltage is checked on oil that has been drummed for more than three months and? or if the drum has been damaged.
Reclaimed uninhibited oil shall meet the limiting values in Table 1 and reclaimed inhibited oil shall meet the limiting values in Table 2.
NOTE 3 Precision data given in the specified methods are to be used solely as a guide to the expected agreement between duplicate measurements of the property and are not to be regarded as tolerances applicable to the limits specified in Table 1 and Table 2.
7 Test methods
7.1 Appearance
To test appearance, a representative sample of the oil shall be examined in transmitted light under an oil depth of approximately 100 mm and at ambient temperature.
7.2 Density
Density shall be measured using any recognized standard test method or, in the event of a dispute, the method specified in BS EN ISO 3675.
Density shall be measured at 20 °C.
NOTE Density values can be converted to 20 °C using Table 59 D of Petroleum measurement paper No.3: Computer implementation procedures for correcting densities and volumes to 20 °C [11.
7.3 Kinematic viscosity
Kinematic viscosity shall be measured by the method described in
BS EN ISO 3104.