EN 61125:1993/A1:2004

Foreword
Section 1 - General
1.1 Scope
1.2 Normative references
1.3 General principle of the methods
1.4 Equipment
1.5 Reagents
1.6 Cleaning of test vessels
1.7 Catalyst
1.8 Insulating liquid sample conditioning
1.9 Determinations on the oxidized insulating liquid
Section 2 - Method A
2.1 Outline of the method
2.2 Test conditions
2.3 Procedure
2.4 Determinations on the oxidized oil
2.5 Report
2.6 Precision
Section 3 - Method B
3.1 Outline of the method
3.2 Test conditions
3.3 Procedure
3.4 Determinations on the oxidized oil (optional)
3.5 Report
3.6 Precision
Section 4 - Method C
4.1 Outline of the method
4.2 Test conditions
4.3 Procedure
4.4 Determinations on the oxidized insulating liquid
4.5 Report
4.6 Precision
Annex A (normative) Determination of maximum diameter
        of the pores of a fritted glass filter
Annex B (normative) Thermometer specifications
Annex ZA (normative) Other international publications
         quoted in this standard with the references
         of the relevant European publications
Figures

Describes three test methods (using the same apparatus) for evaluating the oxidation stability of mineral insulating oils and of hydrocarbon-based insulating liquids. Coverage includes the following items common to the three methods; the cleaning of the glassware; the equipment and reagents; the determinations on the oxidized insulating liquid; the preparation of the catalyst and of the insulating liquid sample to be tested.