K15;E38 标准查询与下载

ASTM D1903-08(2017) 石油电绝缘液体和氯代联苯的热膨胀系数标准测定方法

4.1 Knowledge of the coefficient of thermal expansion of a liquid is essential to compute the required size of a container to accommodate a volume of liquid over the full temperature range to which it will be subjected. It is also used to compute the volume of void space that would exist in an inelastic device filled with the liquid after the liquid has cooled to a lower temperature. 1.1 This practice covers the determination of the coef-ficient of thermal expansion of electrical insulating liquids of petroleum origin, and askarels, containing PCBs (polychlorinated biphenyls), when used as an insulating or cooling medium, or both, in cables, transformers, oil circuit breakers, capacitors, or similar apparatus. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Standard Practice for Determining the Coefficient of Thermal Expansion of Electrical Insulating Liquids of Petroleum Origin, and Askarels

IEC 60970:2007 绝缘液体.粒子计数和大小测定用方法

This standard describes the sampling procedures and methods for the determination of particle concentration and size distribution. Three methods are specified. One uses an automatic particle size analyser, working on the light interruption principle.The other two use an optical microscope,in either the transmitted light or incident light mode,to count particles collected on the surface of a membrane filter.The optical microscope methods are described in ISO 4407. All three methods are applicable to both used and unused insulating liquids. Annex A contains an alternative sampling procedure using a syringe and Annex B reports a reference for the calibration of automatic particle counters.

Insulating liquids - Methods for counting and sizing particles

NF C27-229:1985 绝缘油、浸油纸及浸油纸板中水含量的测定

Determination of water in insulating oils, and in oil-impregnated paper and pressboard.

NF C27-210:1979 相对电容率电介质损耗和绝缘流体直流电阻率的测量

Measurement of relative permittivity dielectric dissipation factor and D.C. Resistivity of insulating liquids.