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BS EN IEC 60567:2024

BS EN IEC 60567:2024

$198.66

Oil-filled electrical equipment. Sampling of free gases and analysis of free and dissolved gases in mineral oils and other insulating liquids. Guidance

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BSI 2024 68
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IEC 60567:2023 deals with the techniques for sampling free gases from gas-collecting relays from power transformers. Three methods of sampling free gases are described. The techniques for sampling oil from oil-filled equipment such as power and instrument transformers, reactors, bushings, oil-filled cables and oil-filled tank-type capacitors are no longer covered by this document, but are instead described in IEC 60475:2022, 4.2. Before analysing the gases dissolved in oil, they are first extracted from the oil. Three basic methods are described, one using extraction by vacuum (Toepler and partial degassing), another by displacement of the dissolved gases by bubbling the carrier gas through the oil sample (stripping) and the last one by partition of gases between the oil sample and a small volume of the carrier gas (headspace). The gases are analysed quantitatively after extraction by gas chromatography; a method of analysis is described. Free gases from gas-collecting relays are analysed without preliminary treatment.

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PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
6 English
CONTENTS
9 FOREWORD
11 INTRODUCTION
13 1 Scope
2 Normative references
14 3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
3.2 Symbols and abbreviated terms
3.2.1 Symbols
3.2.2 Abbreviated terms
15 4 Sampling of gases from gas-collecting relays
4.1 General remarks
4.2 Sampling of free gases by syringe
4.2.1 Sampling equipment
16 4.2.2 Sampling procedure
Figures
Figure 1 – Sampling of gas by syringe
17 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
18 Figure 3 – Sampling of free gases by vacuum
19 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
6.1 Sampling and labelling of oil
6.2 Transfer of oil for DGA analysis
6.2.1 General
6.2.2 Transfer from oil syringes
Tables
Table 1 – Information required for gas samples
20 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
7.1 General remarks
7.2 First method: preparation of a large volume of gas-in-oil standard
7.2.1 Equipment
21 7.2.2 Procedure
22 Figure 4 – First method of preparing gas-in-oil standards
23 7.2.3 Calculation
7.3 Second method: preparation of gas-in-oil standards in a syringe or a vial
7.3.1 General
24 Figure 5 – Second method for preparing gas-in-oil standards
25 7.3.2 Equipment
7.3.3 Procedure
8 Extraction of gases from oil
8.1 General remarks
26 8.2 Multi-cycle vacuum extraction using Toepler pump apparatus
8.2.1 General
8.2.2 Toepler pump extraction apparatus
28 Figure 6 – Example of a Toepler pump extraction apparatus
29 8.2.3 Extraction procedure
30 8.3 Vacuum extraction by partial degassing method
8.3.1 General remarks
8.3.2 Partial degassing apparatus
31 8.3.3 Extraction procedure
8.4 Stripping extraction method
8.4.1 General
8.4.2 Stripping apparatus
32 Figure 7 – Types of glass strippers
33 Figure 8 – Stainless steel stripper
34 8.4.3 Outline of procedure
Figure 9 – Schematic arrangement for connecting an oil stripper to a gas chromatograph
35 8.5 Headspace method
8.5.1 Principle of the method
Figure 10 – Schematic representation of headspace sampler
36 8.5.2 Headspace extraction apparatus
37 Figure 11 – Vial filled with water
39 Figure 12 – Revolving table
40 8.5.3 Headspace extraction procedure
Table 2 – Examples of headspace operating conditions
44 8.5.4 Calibration of the headspace extractor
46 9 Gas analysis by gas-solid chromatography
9.1 General remarks
Table 3 – Examples of headspace partition coefficients at 70 °C in mineral insulating oil
47 Table 4 – Examples of gas chromatographic operating conditions
48 9.2 Outline of suitable methods using Table 4
9.3 Apparatus
9.3.1 Gas chromatograph
49 Figure 13 – Schematic arrangement for gas chromatography
50 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
51 9.4 Preparation of apparatus
9.5 Analysis
9.6 Calibration of the chromatograph
52 9.7 Calculations
10 Quality control
10.1 Verification of the entire analytical system
53 10.2 Limits of detection and quantification
Table 5 – Required limits of detection in oil
54 10.3 Repeatability, reproducibility and accuracy
10.3.1 General remark
10.3.2 Repeatability
10.3.3 Reproducibility
55 10.3.4 Accuracy
11 Report of results
Table 6 – Examples of accuracy of extraction methods
57 Annexes
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
58 Annex B (informative) Alternative gas extraction methods
B.1 Mercury-free versions of the vacuum extraction methods
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
B.2.1 Shake test method
59 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
60 B.2.2 Mechanical oscillation method
Figure B.4 – Schematic representations of mechanical oscillation method
61 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
62 Annex D (informative) Correction for gas bubbles in syringes and air gap in rigid bottles
63 Annex E (informative) Procedure for comparing gas monitor readings to laboratory results
64 Annex F (normative) Insulating liquids based on synthetic and natural esters and silicones
66 Bibliography

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