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eLibrary > BS EN IEC 60567:2024 Oil-filled electrical equipment. Sampling of free gases and analysis of free and dissolved gases in mineral oils and other insulating liquids. Guidance >

BS EN IEC 60567:2024 Oil-filled electrical equipment. Sampling of free gases and analysis of free and dissolved gases in mineral oils and other insulating liquids. Guidance, 2024

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Annex ZA (normative)Normative references to international publicationswith their corresponding European publications [Go to Page]
English [Go to Page]
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms [Go to Page]
3.1 Terms and definitions
3.2 Symbols and abbreviated terms [Go to Page]
3.2.1 Symbols
3.2.2 Abbreviated terms
4 Sampling of gases from gas-collecting relays [Go to Page]
4.1 General remarks
4.2 Sampling of free gases by syringe [Go to Page]
4.2.1 Sampling equipment
4.2.2 Sampling procedure
Figures [Go to Page]
Figure 1 – Sampling of gas by syringe
4.3 Sampling of free gases by displacement of oil
4.4 Sampling of free gases by vacuum
Figure 2 – Sampling of free gases by oil displacement
Figure 3 – Sampling of free gases by vacuum
4.5 Sampling of oil from oil filled equipment
5 Labelling of gas samples
6 Sampling, labelling and transferring of oil from oil-filled equipment [Go to Page]
6.1 Sampling and labelling of oil
6.2 Transfer of oil for DGA analysis [Go to Page]
6.2.1 General
6.2.2 Transfer from oil syringes
Tables [Go to Page]
Table 1 – Information required for gas samples [Go to Page]
6.2.3 Transfer from ampoules
6.2.4 Transfer from flexible metal bottles
6.2.5 Transfer from glass and rigid metal bottles
7 Preparation of gas-in-oil standards [Go to Page]
7.1 General remarks
7.2 First method: preparation of a large volume of gas-in-oil standard [Go to Page]
7.2.1 Equipment
7.2.2 Procedure
Figure 4 – First method of preparing gas-in-oil standards [Go to Page]
7.2.3 Calculation
7.3 Second method: preparation of gas-in-oil standards in a syringe or a vial [Go to Page]
7.3.1 General
Figure 5 – Second method for preparing gas-in-oil standards [Go to Page]
7.3.2 Equipment
7.3.3 Procedure
8 Extraction of gases from oil [Go to Page]
8.1 General remarks
8.2 Multi-cycle vacuum extraction using Toepler pump apparatus [Go to Page]
8.2.1 General
8.2.2 Toepler pump extraction apparatus
Figure 6 – Example of a Toepler pump extraction apparatus [Go to Page]
8.2.3 Extraction procedure
8.3 Vacuum extraction by partial degassing method [Go to Page]
8.3.1 General remarks
8.3.2 Partial degassing apparatus
8.3.3 Extraction procedure
8.4 Stripping extraction method [Go to Page]
8.4.1 General
8.4.2 Stripping apparatus
Figure 7 – Types of glass strippers
Figure 8 – Stainless steel stripper [Go to Page]
8.4.3 Outline of procedure
Figure 9 – Schematic arrangement for connecting an oil stripper to a gas chromatograph
8.5 Headspace method [Go to Page]
8.5.1 Principle of the method
Figure 10 – Schematic representation of headspace sampler [Go to Page]
8.5.2 Headspace extraction apparatus
Figure 11 – Vial filled with water
Figure 12 – Revolving table [Go to Page]
8.5.3 Headspace extraction procedure
Table 2 – Examples of headspace operating conditions [Go to Page]
8.5.4 Calibration of the headspace extractor
9 Gas analysis by gas-solid chromatography [Go to Page]
9.1 General remarks
Table 3 – Examples of headspace partition coefficients at 70 °C in mineral insulating oil
Table 4 – Examples of gas chromatographic operating conditions
9.2 Outline of suitable methods using Table 4
9.3 Apparatus [Go to Page]
9.3.1 Gas chromatograph
Figure 13 – Schematic arrangement for gas chromatography [Go to Page]
9.3.2 Columns
9.3.3 Carrier gas
9.3.4 Detectors
9.3.5 Methanator
9.3.6 Cold trap
9.3.7 Integrator and recorder
9.4 Preparation of apparatus
9.5 Analysis
9.6 Calibration of the chromatograph
9.7 Calculations
10 Quality control [Go to Page]
10.1 Verification of the entire analytical system
10.2 Limits of detection and quantification
Table 5 – Required limits of detection in oil
10.3 Repeatability, reproducibility and accuracy [Go to Page]
10.3.1 General remark
10.3.2 Repeatability
10.3.3 Reproducibility
10.3.4 Accuracy
11 Report of results [Go to Page]
Table 6 – Examples of accuracy of extraction methods
Annexes [Go to Page]
Annex A (informative) Correction for incomplete gas extraction in partial degassing method by calculation
Table A.1 – Examples of solubility coefficients ai (at 25 °C) reported by CIGRE TF D1.01.15 in 2006
Annex B (informative) Alternative gas extraction methods [Go to Page]
B.1 Mercury-free versions of the vacuum extraction methods [Go to Page]
B.1.1 Mercury-free version of the Toepler method
B.1.2 Mercury-free version of the partial degassing method
B.2 Syringe versions of the headspace method [Go to Page]
B.2.1 Shake test method
Figure B.1 – Schematic representation of mercury-free Toepler method
Figure B.2 – Schematic representation of mercury-free partial degassing method
Figure B.3 – Schematic representation of shake test method [Go to Page]
[Go to Page]
B.2.2 Mechanical oscillation method
Figure B.4 – Schematic representations of mechanical oscillation method
Annex C (informative) Preparation of air-saturated standards
Table C.1 – Examples of solubility values of air for different oil types
Table C.2 – Examples of temperature variations for oxygen and nitrogen solubility in mineral oil
Annex D (informative) Correction for gas bubbles in syringes and air gap in rigid bottles
Annex E (informative) Procedure for comparing gas monitor readings to laboratory results
Annex F (normative) Insulating liquids based on synthetic and natural esters and silicones
Bibliography [Go to Page]

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