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
