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BS EN IEC 60599:2022

BS EN IEC 60599:2022

$167.15

Mineral oil-filled electrical equipment in service. Guidance on the interpretation of dissolved and free gases analysis

Published By Publication Date Number of Pages
BSI 2022 46
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This document describes how the concentrations of dissolved gases or free gases can be interpreted to diagnose the condition of oil-filled electrical equipment in service and suggest future action. This document is applicable to electrical equipment filled with mineral insulating oil and insulated with cellulosic paper or pressboard-based solid insulation. Information about specific types of equipment such as transformers (power, instrument, industrial, railways, distribution), reactors, bushings, switchgear and oil-filled cables is given only as an indication in the application notes. This document can be applied, but only with caution, to other liquid-solid insulating systems. In any case, the indications obtained are given only as guidance with resulting action undertaken only with proper engineering judgment.

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PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
10 FOREWORD
12 INTRODUCTION
13 1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
15 3.2 Abbreviated terms
3.2.1 Chemical names and formulae
3.2.2 General abbreviated terms
16 4 Mechanisms of gas formation
4.1 Decomposition of oil
17 4.2 Decomposition of cellulosic insulation
4.3 Stray gassing of oil
4.4 Other sources of gas
5 Identification of faults
5.1 General
18 5.2 Dissolved gas compositions
5.3 Types of faults
5.4 Basic gas ratios
19 Tables
Table 1 – DGA interpretation table
Table 2 – Simplified scheme of interpretation
20 5.5 CO2/CO ratio
5.6 O2/N2 ratio
21 5.7 C2H2/H2 ratio
5.8 C3 hydrocarbons
5.9 Evolution of faults
5.10 Graphical representations
22 6 Conditions for calculating ratios
6.1 Examination of DGA values
6.2 Uncertainty on gas ratios
7 Application to free gases in gas relays
24 8 Gas concentration levels in service
8.1 Probability of failure in service
8.1.1 General
Table 3 – Ostwald solubility coefficients for various gases in mineral insulating oils
25 8.1.2 Calculation methods
8.2 Typical concentration values
8.2.1 General
8.2.2 Calculation methods
8.2.3 Choice of normality percentages
8.2.4 Alarm concentration values
26 8.3 Rates of gas increase
9 Recommended method of DGA interpretation
27 10 Report of results
28 Figures
Figure 1 – Flow chart
29 Annex A (informative) Equipment application notes
A.1 General warning
A.2 Power transformers
A.2.1 Specific subtypes
A.2.2 Typical faults
30 A.2.3 Identification of faults by DGA
A.2.4 Typical concentration values
Table A.1 – Typical faults in power transformers
31 A.2.5 Typical rates of gas increase
Table A.2 – Ranges of 90 % typical gas concentration values observed in power transformers
Table A.3 – Ranges of 90 % typical rates of gas increase observed in power transformers (all types)
32 A.2.6 Specific information to be added to the DGA report
A.3 Industrial and special transformers
A.3.1 Specific subtypes
A.3.2 Typical faults
33 A.3.3 Identification of faults by DGA
A.3.4 Typical concentration values
Table A.4 – Examples of 90 % typical concentration values observed on individual networks
Table A.5 – Ranges of 90 % typical concentration values observed in WTTs
34 A.4 Instrument transformers
A.4.1 Specific subtypes
A.4.2 Typical faults
A.4.3 Identification of faults by DGA
Table A.6 – Typical faults in instrument transformers
35 A.4.4 Typical concentration values
A.5 Oil-impregnated paper bushings
A.5.1 Specific subtypes
A.5.2 Typical faults
Table A.7 – Ranges of 90 % typical concentration values observed in instrument transformers
Table A.8 – Maximum admissible values for sealed instrument transformers
36 A.5.3 Identification of faults by DGA
A.5.4 Typical concentration values
Table A.9 – Typical faults in bushings
Table A.10 – Simplified interpretation scheme for bushings
37 A.6 Oil-filled cables
A.6.1 Typical faults
A.6.2 Identification of faults by DGA
A.6.3 Typical concentration values
Table A.11 – Ranges of 90 % typical concentration values in bushings
38 A.7 Switching equipment
A.7.1 Specific subtypes
A.7.2 Normal operation
A.7.3 Typical faults
A.7.4 Identification of faults by DGA
Table A.12 – Ranges of 95 % typical concentration values observed on cables
Table A.13 – Typical faults in switching equipment
39 A.8 Equipment filled with non-mineral fluids
40 Annex B (informative) Graphical representations of gas ratios
Figure B.1 – Graphical representation 1 of gas ratios
41 Figure B.2 – Graphical representation 2 of gas ratios
42 Figure B.3 – Graphical representation 3 of gas ratios – Duval’s triangle 1 for transformers, bushings and cables
43 Figure B.4 – Graphical representation 4 of gas ratios – Duval’s triangle 2 for OLTCs (see A.7.2)

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BS EN IEC 60599:2022
$167.15