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BS EN IEC 60567:2024 – TC

BS EN IEC 60567:2024 – TC

$258.95

Tracked Changes. 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 159
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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.

PDF Catalog

PDF Pages PDF Title
1 30486751
92 A-30441848
93 undefined
96 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
97 English
CONTENTS
100 FOREWORD
102 INTRODUCTION
104 1 Scope
2 Normative references
105 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
106 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
107 4.2.2 Sampling procedure
Figures
Figure 1 – Sampling of gas by syringe
108 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
109 Figure 3 – Sampling of free gases by vacuum
110 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
111 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
112 7.2.2 Procedure
113 Figure 4 – First method of preparing gas-in-oil standards
114 7.2.3 Calculation
7.3 Second method: preparation of gas-in-oil standards in a syringe or a vial
7.3.1 General
115 Figure 5 – Second method for preparing gas-in-oil standards
116 7.3.2 Equipment
7.3.3 Procedure
8 Extraction of gases from oil
8.1 General remarks
117 8.2 Multi-cycle vacuum extraction using Toepler pump apparatus
8.2.1 General
8.2.2 Toepler pump extraction apparatus
119 Figure 6 – Example of a Toepler pump extraction apparatus
120 8.2.3 Extraction procedure
121 8.3 Vacuum extraction by partial degassing method
8.3.1 General remarks
8.3.2 Partial degassing apparatus
122 8.3.3 Extraction procedure
8.4 Stripping extraction method
8.4.1 General
8.4.2 Stripping apparatus
123 Figure 7 – Types of glass strippers
124 Figure 8 – Stainless steel stripper
125 8.4.3 Outline of procedure
Figure 9 – Schematic arrangement for connecting an oil stripper to a gas chromatograph
126 8.5 Headspace method
8.5.1 Principle of the method
Figure 10 – Schematic representation of headspace sampler
127 8.5.2 Headspace extraction apparatus
128 Figure 11 – Vial filled with water
130 Figure 12 – Revolving table
131 8.5.3 Headspace extraction procedure
Table 2 – Examples of headspace operating conditions
135 8.5.4 Calibration of the headspace extractor
137 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
138 Table 4 – Examples of gas chromatographic operating conditions
139 9.2 Outline of suitable methods using Table 4
9.3 Apparatus
9.3.1 Gas chromatograph
140 Figure 13 – Schematic arrangement for gas chromatography
141 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
142 9.4 Preparation of apparatus
9.5 Analysis
9.6 Calibration of the chromatograph
143 9.7 Calculations
10 Quality control
10.1 Verification of the entire analytical system
144 10.2 Limits of detection and quantification
Table 5 – Required limits of detection in oil
145 10.3 Repeatability, reproducibility and accuracy
10.3.1 General remark
10.3.2 Repeatability
10.3.3 Reproducibility
146 10.3.4 Accuracy
11 Report of results
Table 6 – Examples of accuracy of extraction methods
148 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
149 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
150 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
151 B.2.2 Mechanical oscillation method
Figure B.4 – Schematic representations of mechanical oscillation method
152 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
153 Annex D (informative) Correction for gas bubbles in syringes and air gap in rigid bottles
154 Annex E (informative) Procedure for comparing gas monitor readings to laboratory results
155 Annex F (normative) Insulating liquids based on synthetic and natural esters and silicones
157 Bibliography

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