AS 1767.2.2-2008

1 - AS 1767.2.2-2008 Insulating liquids Method 2.2: Test methods—Measurement of relative permittivity, dielectric dissipation factor (tan δ) and d.c. resistivity
4 - PREFACE
5 - CONTENTS
6 - INTRODUCTION
7 - 1 Scope
7 - 2 Normative references
7 - 3 Terms and definitions
8 - 4 General
8 - 4.1 Permittivity and dielectric dissipation factor (tan δ)
9 - 4.2 Resistivity
9 - 4.3 Sequence of determinations
9 - 4.4 Factors leading to erroneous results
10 - 5 Apparatus
10 - 5.1 Test cell
11 - 5.2 Test equipment
11 - 5.3 Glassware
11 - 5.4 Measuring instrument for permittivity and tan δ
11 - 5.5 Measuring instrument for d.c. resistivity
11 - 5.6 Time-measuring device
11 - 5.7 Safety
11 - 6 Cleaning solvent
12 - 7 Cleaning the test cell
12 - 7.1 Trisodium phosphate cleaning procedure
13 - 7.2 Storage of cell
13 - 8 Sampling
13 - 9 Preparation of samples
14 - 10 Conditioning and filling the test cell
14 - 10.1 Cell conditioning
14 - 10.2 Filling the cell
14 - 11 Test temperature
14 - 12 Measurement of dissipation factor (tan δ)
14 - 12.1 Test voltage
14 - 12.2 Measurement
15 - 12.3 Report
15 - 13 Measurement of relative permittivity
15 - 13.1 Measurement
16 - 13.2 Report
16 - 14 Measurement of d.c. resistivity
16 - 14.1 Test voltage
16 - 14.2 Time of electrification
16 - 14.3 Measurement
17 - 14.4 Report
18 - Annex A (informative) Example of an alternative procedure for cleaning the test cell – Ultrasonic procedure
19 - Annex B (informative) Example of a simplified cleaning procedure for a test cell
20 - Annex C (informative) Alternative procedures for routine testing of dielectric dissipation factor and resistivity of insulating liquids

Adopts IEC 60814, Ed. 2 (1997) to specify methods of determination the dielectric dissipation factor (tan (), relative permittivity and d.c. resistivity of single phase, insulating liquid materials at the test temperature. The methods are primarily intended for making reference tests on unused liquids but can also be applied to liquids in service in transformers, cables and other electrical apparatus. Simplified procedures are also included for routine testing.

First published as AS 1767.2.2-2008.