This standard gives principles for maintenance and supervision of transformer oil.
This standard is applicable to mineral insulating oils used in oil-filled electrical equipment such as power transformers, reactors, instrument transformers, and oil-filled bushings.
This standard does not apply to synthetic insulating liquids.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 261 Determination of flash point—Pensky-Martens closed cup method
GB 264 Petroleum products—Determination of acid number
GB/T 507 Insulating liquids—Determination of the breakdown voltage at power frequency
GB 2536 Fluids for electrotechnical applications—Unused mineral insulating oils for transformers and switchgear
GB/T 5654 Insulating liquids—Measurement of relative permittivity, dielectric dissipation factor (tanδ) and d.c. resistivity
GB/T 6540 Petroleum products—Determination of color
GB/T 6541 Petroleum products—Mineral oils—Determination of interfacial tension of oil against water—Ring method
GB/T 7595 Quality of transformer oils in service
GB/T 7597 Method of sampling for transformer and turbine oils in electric power industry
GB/T 7598 Determination of water-soluble acid in transformer oils in service
GB/T 7600 Determination of water content in transformer oils and turbine oils in service by coulometric method
GB/T 8926-2012 Standard test method for insolubles in used lubricating oils
GB 50150 Standard for hand-over test of electric equipment electric equipment installation engineering
DL/T 285 Determination of corrosive sulfur in mineral insulating oils—Insulated copper flat wire method
DL/T 385 Determination of electrification tendency of transformer oil
DL/T 419 Power oil terminology
DL/T 421 Determination of oil volume resistivity of power oil
DL/T 429.6 Open cup aging test for power oils
DL/T 429.7 Determination of sludge by precipitation
DL/T 432 Determination of particulate contamination in power oils
DL/T 596 Preventive test procedures for power equipment
DL/T 703 Determination of gas content in insulating oil by gas chromatography
DL/T 722 Guideline for the analysis and determination of dissolved gases in transformer oil
DL/T 1096 Particle size limit in transformer oil
DL/T 1355 Determination of furfural content in transformer oil—Liquid chromatography
DL/T 1419 Guideline for reclamation and use of transformer oil
DL/T 1459 Determination of the content of metal passivator in mineral insulating oils—High performance liquid chromatography
DL/T 1552 Guideline for storage management of transformer oil
NB/SH/T 0810 Determination of gassing characteristic of insulating liquid under electric field and ionization effect
NB/SH/T 0812 Determination of 2-furfural and related components in mineral insulating oil
SH/T 0802 Determination of 2,6-bi-tert-butyl-paracresol in insulating oils
IEC 60422 Mineral insulating oils in electrical equipment—Supervision and maintenance guidance
IEC 62697-1 Test methods for quantitative determination of corrosive sulfur compounds in unused and used insulating liquids—Part 1: Test method for quantitative determination of dibenzyl disulfide (DBDS)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in DL/T 419 and the following apply.
3.1
mineral insulating oil
refined insulating oil from natural petroleum
[Definition 3.9 in DL/T 419-2015]
3.2
reconditioning
process that reduces the content of impurities such as gases, water, and solid particles in used oil products to an acceptable level by physical processing
GB/T 14542-2017 The following standards are cited：
