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BS EN IEC 61125:2018

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Current

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Insulating liquids. Test methods for oxidation stability. Test method for evaluating the oxidation stability of insulating liquids in the delivered state
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

04-24-2018

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Apparatus
Annex A (normative) - 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
Annex C (informative) - Method for evaluation of
        thermo-oxidative behaviour of unused
        ester insulating liquids
Bibliography
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

Explains a test method for evaluating the oxidation stability of insulating liquids in the delivered state under accelerated conditions regardless of whether or not antioxidant additives are present.

This document describes a test method for evaluating the oxidation stability of insulating liquids in the delivered state under accelerated conditions regardless of whether or not antioxidant additives are present. The duration of the test can be different depending on the insulating liquid type and is defined in the corresponding standards (e.g. in IEC 60296, IEC 61099, IEC 62770). The method can be used for measuring the induction period, the test being continued until the volatile acidity significantly exceeds 0,10 mg KOH/g in the case of mineral oils. This value can be significantly higher in the case of ester liquids.

The insulating liquid sample is maintained at 120 °C in the presence of a solid copper catalyst whilst bubbling air at a constant flow. The degree of oxidation stability is estimated by measurement of volatile acidity, soluble acidity, sludge, dielectric dissipation factor, or from the time to develop a given amount of volatile acidity (induction period with air).

In informative Annex B, a test method for evaluating the oxidation stability of inhibited mineral insulating oils in the delivered state by measurement of the induction period with oxygen is described. The method is only intended for quality control purposes. The results do not necessarily provide information on the performance in service. The oil sample is maintained at 120 °C in the presence of a solid copper catalyst whilst bubbling through a constant flow of oxygen. The degree of oxidation stability is estimated by the time taken by the oil to develop a determined amount of volatile acidity (induction period with oxygen). Additional criteria such as soluble and volatile acidities, sludge and dielectric dissipation factor can also be determined after a specified duration.

In informative Annex C, a test method intended to simulate the thermo-oxidative behaviour of ester insulating liquids (headspace of air at 150 °C for 164 h) is described.

Additional test methods such as those described in IEC TR 62036 based on differential scanning calorimetry can also be used as screening tests, but are out of the scope of this document.

Committee
GEL/10
DevelopmentNote
Supersedes BS EN 61125. (05/2018)
DocumentType
Standard
Pages
34
PublisherName
British Standards Institution
Status
Current
Supersedes

Standards Relationship
IEC 61125:2018 Identical
EN 60601-1-11:2010 Identical
EN IEC 61125:2018 Identical
IEC 61125:1992 Identical

ISO 4793:1980 Laboratory sintered (fritted) filters — Porosity grading, classification and designation
IEC 62021-1:2003 Insulating liquids - Determination of acidity - Part 1: Automatic potentiometric titration
IEC TR 62036:2007 Mineral insulating oils - Oxidation stability test method based on differential scanning calorimetry (DSC)
EN 60422:2013 Mineral insulating oils in electrical equipment - Supervision and maintenance guidance
IEC 62021-2:2007 Insulating liquids - Determination of acidity - Part 2: Colourimetric titration
EN ISO 3104:1996 Petroleum products - Transparent and opaque liquids - Determination of kinematic viscosity and calculation of dynamic viscosity (ISO 3104:1994)
IEC 60422:2013 Mineral insulating oils in electrical equipment - Supervision and maintenance guidance
IEC 60050-212:2010 International Electrotechnical Vocabulary (IEV) - Part 212: Electrical insulating solids, liquids and gases
ISO 383:1976 Laboratory glassware — Interchangeable conical ground joints
IEC 62770:2013 Fluids for electrotechnical applications - Unused natural esters for transformers and similar electrical equipment
IEC 61099:2010 Insulating liquids - Specifications for unused synthetic organic esters for electrical purposes
EN 62021-2 : 2007 INSULATING LIQUIDS - DETERMINATION OF ACIDITY - PART 2: COLOURIMETRIC TITRATION
IEC 60296:2012 RLV Fluids for electrotechnical applications - Unused mineral insulating oils for transformers and switchgear
EN 62021-3:2014 Insulating liquids - Determination of acidity - Part 3: Test methods for non mineral insulating oils
EN 60247:2004 Insulating liquids - Measurement of relative permittivity, dielectric dissipation factor (tan d) and d.c. resistivity
IEC 60666:2010 Detection and determination of specified additives in mineral insulating oils
ISO 6344-1:1998 Coated abrasives Grain size analysis Part 1: Grain size distribution test
IEC 60247:2004 Insulating liquids - Measurement of relative permittivity, dielectric dissipation factor (tan d) and d.c. resistivity
IEC 62021-3:2014 Insulating liquids - Determination of acidity - Part 3: Test methods for non-mineral insulating oils

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