GB/T 21221-2022 (English Version) PDF

Standard No.: GB/T 21221-2022
Language: Chinese, Available in English version
Release Date: 2022
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 21221-2022
Replace: GB/T 21221-2007

Scope: This document specifies the marking and general delivery requirements, sampling, technical specifications and test methods for several unused synthetic aromatic hydrocarbon insulating liquids used as insulating liquid media for electrical equipment. This document applies to unused alkylbenzenes, diphenylethanes, alkylnaphthalenes and methylpolyarylmethanes used as insulating liquid media in electrical equipment.

GB/T 21221-2022 Referenced Document

GB/T 10065-2007 Gassing of insulating liquids under electrical stress and ionization
GB/T 18612-2011 Determination of organic chloride content in crude oil
GB/T 1884 Crude petroleum and liquid petroleum products--Laboratory determination of density--Hydrometer method
GB/T 25961 Standard test method for corrosive sulfur in electrical insulating oils
GB/T 261 Determination of flash point—Pensky-Martens closed cup method
GB/T 27750 Classification of insulating liquids
GB/T 30515 Petroleum products.Transparent and opaque liquids.Determination of kinematic viscosity and calculation of dynamic viscosity
GB/T 3535 Petroleum products.Determination of pour point
GB/T 41146 Method of sampling insulating liquids
GB/T 507 Insulating liquids--Determination of the breakdown voltage at power frequency
GB/T 5654 Insulating liquids.Measurement of relative permittivity,dielectric dissipation factor and d.c.resistivity
NB/T 42140 Determination of moisture content of insulating liquid oil-impregnated paper and oil-impregnated cardboard by Karl Fischer automatic coulometric titration
SH/T 0205 Methods of measurement for the refractive index and specific dispersion of electrical insulating fluid

2022 GB/T 21221-2022 Insulating liquids—Specifications for unused liquids based on synthetic aromatic hydrocarbons
2007 GB/T 21221-2007 Insulating liquids.Specifications for unused insulating liquids based on synthetic aromatic hydrocarbons