GB/T 5654-2007 in English

《GB/T 5654-2007液体绝缘材料 相对电容率、介质损耗因数和直流电阻率的测量》由TC51（全国绝缘材料标准化技术委员会）归口，主管部门为中国电器工业协会。
本标准等同采用IEC 60247: 2004，规定了在试验温度下液体绝缘材料的介质损耗因数、相对电容率和直流电阻率的测量方法。

1 Scope

This standard describes methods for the determination of the dielectric dissipation factor (tan δ), relative permittivity and d. c. resistivity of any insulating liquid material at the test temperature.
The methods are primarily intended for making reference tests on unused liquids. They can also be applied to liquids in service in transformers, cables and other electrical apparatus. However the method is applicable to a single phase liquid only. When it is desired to make routine determinations, simplified procedures, as described in Annex C, may be adopted.
With insulating liquids other than hydrocarbons, alternative cleaning procedures may be required.

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.

1 Scope
2 Normative References
3 Terms and Definitions
4 General
5 Apparatus
6 Cleaning Solvent
7 Cleaning the Test Cell
8 Sampling
9 Preparation of Samples
10 Conditioning and Filling the Test Cell
11 Test Temperatures
12 Measurement of Dissipation Factor (tan δ)
13 Measurement of Relative Permittivity
14 Measurement of d. c. Resistivity
Annex A (Informative) Example of An Alternative Procedure for Cleaning the Test Cell – Ultrasonic Procedure
Annex B (Informative) Example of A Simplified Cleaning Procedure for A Test Cell
Annex C (Informative) Alternative Procedures for Routine Testing of Dielectric Dissipation Factor and Resistivity of Insulating Liquids