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eLibrary > BS EN IEC 61125:2018 Insulating liquids. Test methods for oxidation stability. Test method for evaluating the oxidation stability of insulating liquids in the delivered state >

BS EN IEC 61125:2018 Insulating liquids. Test methods for oxidation stability. Test method for evaluating the oxidation stability of insulating liquids in the delivered state, 2018

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BS EN IEC 61125:2018 Insulating liquids. Test methods for oxidation stability. Test method for evaluating the oxidation stability of insulating liquids in the delivered state, 2018

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English [Go to Page]
CONTENTS
FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Apparatus [Go to Page]
4.1 General principle of the method
4.2 Equipment [Go to Page]
4.2.1 Heating arrangement
4.2.2 Test vessels
4.2.3 Absorption tubes
4.2.4 Filtering crucibles
4.2.5 Porcelain vessels
4.2.6 Flowmeter
4.2.7 Timer
4.2.8 Gas supply
4.2.9 Analytical balance
4.2.10 Burette
4.2.11 Volumetric pipette
4.2.12 Volumetric flask
4.2.13 Graduated measuring cylinder
4.2.14 Thermometer
4.2.15 Erlenmeyer flask
4.3 Reagents [Go to Page]
4.3.1 Normal heptane
4.3.2 Alkali blue 6B indicator according to IEC 62021-2
4.3.3 Phenolphthalein indicator
4.3.4 Potassium hydroxide according to IEC 62021-2
4.3.5 Oxidant gas
4.3.6 Acetone
4.4 Cleaning of test vessels
4.5 Catalyst
4.6 Insulating liquid sample conditioning
4.7 Preparation of the test
4.8 Determinations on the oxidized insulating liquid [Go to Page]
4.8.1 Sludge formation
4.8.2 Soluble acidity (SA)
4.8.3 Volatile acidity (VA)
4.8.4 Total acidity (TA)
4.8.5 Dielectric dissipation factor (DDF)
4.8.6 Oxidation rate with air
4.8.7 Induction period with air (IP with air) (optional)
4.9 Report
4.10 Precision [Go to Page]
4.10.1 General
4.10.2 Repeatability (r) (95 % confidence)
4.10.3 Reproducibility (R) (95 % confidence)
Tables [Go to Page]
Table 1 – Repeatability and reproducibility of the oxidation stability test of uninhibited mineral oil in the delivered state for 164 h at 120 °C
Figures [Go to Page]
Figure 1 – Typical 8 hole (4 x 2) aluminium heating block
Figure 2 – Aluminium alloy temperature measuring block
Figure 3 – Position of the tube in the oil bath
Figure 4 – Oxidation tube or absorption tube
Figure 5 – Oxidation tube and absorption tube assembly
Annexes [Go to Page]
Annex A (normative) Thermometer specifications
Table A.1 – Thermometer specifications
Annex B (informative) Method for evaluating the oxidation stability of inhibited insulating liquids in the delivery state by measurement of the induction period with oxygen [Go to Page]
B.1 Outline of the method
B.2 Reagents and test conditions
B.3 Procedure [Go to Page]
B.3.1 General
B.3.2 Preparation of the test
B.3.3 Oxidation
B.3.4 Determination of the induction period with oxygen
B.3.5 Determinations on the oxidized oil (optional)
B.4 Report
B.5 Precision [Go to Page]
B.5.1 General
B.5.2 Relative repeatability (r) (95 % confidence)
B.5.3 Relative reproducibility (R) (95 % confidence)
Table B.1 – Precision data for induction time with oxygen for the oxidation testfor mineral oil according to Annex B
Annex C (informative) Method for evaluation of thermo-oxidative behaviour of unused ester insulating liquids [Go to Page]
C.1 Outline of the method
C.2 Equipment [Go to Page]
C.2.1 Heating arrangement
C.2.2 Test vessels
C.2.3 Reagents
C.3 Test procedure [Go to Page]
C.3.1 Sample conditioning and preparation
C.3.2 Ageing procedure
C.4 Determination of the oxidized insulating liquid [Go to Page]
C.4.1 Soluble acidity
C.4.2 Dielectric dissipation factor (DDF) at 90 C
C.4.3 Appearance
C.4.4 Kinematic viscosity
C.5 Report
Figure C.1 – Headspace vial with copper catalyst [Go to Page]
C.6 Precision
Table C.1 – Precision data for headspace procedure according to Annex C
Bibliography [Go to Page]

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BS EN IEC 61125:2018 Insulating liquids. Test methods for oxidation stability. Test method for evaluating the oxidation stability of insulating liquids in the delivered state, 2018

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