I.S. EN 60247:2004

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 General
   4.1 Permittivity and dielectric dissipation factor
        (tan delta)
   4.2 Resistivity
   4.3 Sequence of determinations
   4.4 Factors leading to erroneous results
5 Apparatus
   5.1 Test cell
   5.2 Test equipment
   5.3 Glassware
   5.4 Measuring instrument for permittivity and tan
        delta
   5.5 Measuring instrument for d.c. resistivity
   5.6 Time-measuring device
   5.7 Safety
6 Cleaning solvent
7 Cleaning the test cell
   7.1 Trisodium phosphate cleaning procedure
   7.2 Storage of cell
8 Sampling
9 Preparation of samples
10 Conditioning and filling the test cell
   10.1 Cell conditioning
   10.2 Filling the cell
11 Test temperature
12 Measurement of dissipation factor (tan delta)
   12.1 Test voltage
   12.2 Measurement
   12.3 Report
13 Measurement of relative permittivity
   13.1 Measurement
   13.2 Report
14 Measurement of d.c. resistivity
   14.1 Test voltage
   14.2 Time of electrification
   14.3 Measurement
   14.4 Report
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
Annex ZA (normative) Normative references to international
         publications with their corresponding European
         publications

Defines methods for the determination of the dielectric dissipation factor (tan delta), 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.