AS 1767.2.5-1999

1 - AS 1767.2.5-1999 INSULATING LIQUIDS - TEST METHODS - UNUSED HYDROCARBON-BASED INSULATING LIQUIDS-TEST METHODS FOR EVALUATING...
4 - PREFACE
6 - CONTENTS
7 - Section 1: General
7 - 1.1 Scope
7 - 1.2 Normative references
8 - 1.3 General principle of the methods
8 - 1.4 Equipment
8 - 1.4.1 Heating arrangement
9 - 1.4.2 Test vessels
9 - 1.4.3 Absorption tubes
9 - 1.4.4 Filtering crucibles
10 - 1.4.5 Porcelain vessels
10 - 1.4.6 Soap bubble flowmeter
10 - 1.4.7 Timer
10 - 1.4.8 Gas supply
10 - 1.4.9 Burette
10 - 1.4.10 Thermometer
10 - 1.4.11 Erlenmeyer
11 - 1.5 Reagents
11 - 1.5.1 Normal heptane
11 - 1.5.2 Alkali blue 6 B indicator
11 - 1.5.3 Phenolphthalein indicator
11 - 1.5.4 Titration solvent
11 - 1.5.5 Potassium hydroxide
11 - 1.5.6 Oxidant gas
11 - 1.5.7 Hydrochloric acid
11 - 1.5.8 Chloroform
12 - 1.6 Cleaning of test vessels
12 - 1.7 Catalyst
12 - 1.8 Insulating liquid sample conditioning
12 - 1.9 Determinations on the oxidized insulating liquid
12 - 1.9.1 Sludge formation
13 - 1.9.2 Soluble acidity (SA)
14 - 1.9.3 Volatile acidity (VA)
14 - 1.9.4 Total acidity (TA)
15 - 1.9.5 Oxidation rate (only for methods B and C)
15 - 1.9.6 Dielectric dissipation factor
15 - Section 2: Method A
15 - 2.1 Outline of the method
15 - 2.2 Test conditions
15 - 2.3 Procedure
15 - 2.3.1 Preparation of the test
16 - 2.3.2 Oxidation
16 - 2.4 Determinations on the oxidized oil
16 - 2.4.1 Sludge
16 - 2.4.2 Soluble acidity (SA)
16 - 2.4.3 Other determination (optional)
16 - 2.5 Report
16 - 2.6 Precision
17 - Section 3: Method B
17 - 3.1 Outline of the method
17 - 3.2 Test conditions
18 - 3.3 Procedure
18 - 3.3.1 Preparation of the test
18 - 3.3.2 Oxidation
18 - 3.3.3 Determination of the induction period
19 - 3.4 Determinations on the oxidized oil (optional)
19 - 3.4.1 Sludge
19 - 3.4.2 Soluble acidity (SA)
19 - 3.4.3 Volatile acidity (VA)
19 - 3.4.4 Total acidity (TA)
19 - 3.4.5 Oxidation rate
19 - 3.4.6 Dielectric dissipation factor
20 - 3.5 Report
20 - 3.6 Precision
20 - 3.6.1 Relative repeatability (r) (95% confidence):
20 - 3.6.2 Relative reproducibility (R) (95% confidence):
21 - Section 4: Method C
21 - 4.1 Outline of the method
21 - 4.2 Test conditions
21 - 4.3 Procedure
21 - 4.3.1 Preparation of the test
22 - 4.3.2 Oxidation
22 - 4.4 Determinations on the oxidized insulating liquid
22 - 4.4.1 Sludge
22 - 4.4.2 Soluble acidity (SA)
22 - 4.4.3 Volatile acidity (VA)
22 - 4.4.4 Total acidity (TA)
22 - 4.4.5 Other determinations (optional)
23 - 4.5 Report
23 - 4.6 Precision
23 - 4.6.1 Relative repeatability (r) (95% confidence)
23 - 4.6.2 Relative reproducibility (R) (95% confidence)
24 - ANNEX A - Determination of maximum diameter of the pores of a fritted glass filter
25 - ANNEX B - Thermometer specifications
25 - B.1 Thermometer specification for method A
25 - B.2 Thermometer specification for methods B and C
30 - APPENDIX ZZ - VARIATIONS TO IEC 61125 FOR APPLICATION IN AUSTRALIA

Sets out three test methods using the same apparatus for evaluating the oxidation stability of mineral insulating oils and of hydrocarbon based insulating liquids. This Standard is based on but is not equivalent to, and has been reproduced from, IEC 61125:1992.

This International Standard describes three test methods using the same apparatus for evaluating the oxidation stability of mineral insulating oils and of hydrocarbon-based insulating liquids. It comprises four sections as follows:Section 1 describes the following items common to the three methods:û the equipment and reagents;û the cleaning of the glassware;û the preparation of the catalyst and of the insulating liquid sample to be tested;û the determinations on the oxidized insulating liquid.Section 2 û Method A describes a method for evaluating the oxidation stability of unused uninhibited mineral insulating oils under accelerated conditions.Section 3 û Method B describes a method for evaluating the oxidation stability of unused inhibited mineral insulating oils under accelerated conditions.Section 4 û Method C describes a method for evaluating the oxidation stability of unused uninhibited and inhibited hydrocarbon insulating liquids under accelerated conditions.

First published as AS 1767.2.5-1999.