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GB/T 7595-2017 PDF in English

GB/T 7595-2017 (GB/T7595-2017, GBT 7595-2017, GBT7595-2017)
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GB/T 7595-2017: PDF in English (GBT 7595-2017)

GB/T 7595-2017
ICS 27.100
F 24
Replacing GB/T 7595-2008
Quality of Transformer Oils in Service
ISSUED ON. MAY 12, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
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Table of Contents
Foreword ... 3 
1 Application Scope ... 5 
2 Normative References ... 5 
3 Technical Requirements ... 7 
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 7595-2008, Quality of Transformer Oils in Service.
Compared with GB/T 7595-2008, the major changes of this Standard are as follows.
-- the application scope of the standard is modified;
-- the normative references are modified;
-- the standard for the quality of mineral transformer oils in service is modified;
-- the standard for the quality of breaker oils in service is modified;
-- the inspection items, such as chromaticity, and relevant quality indexes and test
methods are added;
-- part of test methods are modified;
-- the terms and definitions are deleted;
-- part of test items are deleted;
-- test cycles and test items are deleted;
-- informative Annex A “Maximum Viscosity of Transformer Oils at the Lowest Cold-
start Energizing Temperature” is deleted;
-- informative Annex B “Effects of Different Electrode Shapes and Operating
Methods on the Measured Values of Breakdown Voltage” is deleted;
-- informative Annex C “Anti-degradation Measures for Transformer Oils in Service”
is deleted.
This Standard was proposed by China Electricity Council.
This Standard shall be under the jurisdiction of the National Standardization Technical
Committee on Electrification (SAC/TC 322).
The major drafting organization of this Standard. Xi’an Thermal Power Research
Institute Co., Ltd.
The contributory drafting organizations of this Standard. China Petroleum Karamay
Lubricating Oil Research Institute, Jiangsu Electric Power Company Electric Power
Research Institute, State Grid Tianjin Electric Power Research Institute, Guangdong
Power Grid Co., Ltd. Electric Power Research Institute.
The main drafters of this Standard. Xiao Xiuyuan, Ma Shujie, Wang Juan, Meng
Quality of Transformer Oils in Service
1 Application Scope
This Standard specifies the quality standard for mineral transformer oils and beaker
oils in service.
This Standard applies to the quality and supervision of mineral transformer oils and
breaker oils in service, which are filled in electrical equipment.
This Standard does not apply to mineral insulating oils, which are used for cables or
condensers as impregnating compounds.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to This Standard.
GB/T 261, Determination of Flash Point – Pensky-Martens Closed Cup Method
GB/T 264, Petroleum Products – Determination of Acid Number
GB/T 507, Insulating Liquids – Determination of the Breakdown Voltage at Power
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 and D.C. Resistivity
GB/T 6540, Petroleum Products – Determination of Colour
GB/T 6541, Petroleum Products – Mineral Oils – Determination of Interfacial
Tension of Oil against Water – Ring Method
GB/T 7598, Determination of Water-soluble Acid in Transformer and Turbine Oils in
Service by Colorimetric Method
GB/T 7600, Determination of Water Content in Transformer Oils in Service by
Coulometric Method
GB/T 7601, Determination of Water Content for Transformer and Turbine Oils in
Service by Gas Chromatographic Method
GB/T 8926-2012, Standard Test Method for Insolubles in Used Lubricating Oils
GB/T 14542, Guide for Maintenance and Supervision of Transformer Oil in Service
GB/T 25961, Standard Test Method for Corrosive Sulfur in Electrical Insulating Oils
GB/T 28552, Determination of Acid Number in Transformer Oils and Turbine Oils by
BTB Method
DL/T 285, Test Method for Corrosive Sulphur in Mineral Insulating Oils – Copper
Conductor Wrapped with Insulating Paper
DL/T 385, Determination of Electrostatic Charging Tendency of Transformer Oil
DL/T 421, Determination of Volume Resistivity of Power Oils
DL/T 423, Determination of Dissolved Gas Content in Insulating Oil – Method of
Vacuum Pressure Difference
DL/T 432, Determination of Particulate Contamination in Oil
DL/T 703, Determination of Dissolved Gas Content in Insulating Oil by Gas
DL/T 929, Determination of the Content in Insulating Oil and Lubricating Oil by
Infrared Spectrum Method
DL/T 1094, Guide to the Choice of Power Transformer Oil
DL/T 1095, Guide to on-site Determination of Electrostatic Charging Tendency of
Transformer Oil
DL/T 1096, Limited Value of Particular Pollutant of Transformer Oils
DL/T 1354, The Method of Flash Point of Power Oil by Microscale Continuously
Closed Cup Tester
DL/T 1355, Method for Determination of Furfural Content in Transformer Oil by
NB/SH/T 0810, Gassing of Insulating Liquids under Electrical Stress and Ionization
NB/SH/T 0812, Mineral Insulating Oils – Method for the determination of 2-furfural
and Related Compounds
SH/T 0802, Determination of 2,6-bi-tert-butyl-paracresol in Insulating Oils
SH/T 0804, Detection of Corrosive Sulfur of Insulating Oils – Silver Strip Test
IEC 62697-1, Test Methods for Quantitative Determination of Corrosive Sulfur
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.