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BS EN IEC 62836:2024 – TC

BS EN IEC 62836:2024 – TC

$258.95

Tracked Changes. Measurement of internal electric field in insulating materials. Pressure wave propagation method

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BSI 2024 111
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IEC 62836:2024 provides an efficient and reliable procedure to test the internal electric field in the insulating materials used for high-voltage applications, by using the pressure wave propagation (PWP) method. It is suitable for a planar and coaxial geometry sample with homogeneous insulating materials of thickness larger or equal to 0,5 mm and an electric field higher than 1 kV/mm, but it is also dependent on the thickness of the sample and the pressure wave generator. This first edition cancels and replaces IEC TS 62836 published in 2020. This edition includes the following significant technical changes with respect to IEC TS 62836: a) addition of Clause 12 for the measurement of space charge distribution in a planar sample; b) addition of Clause 13 for coaxial geometry samples; c) addition of Annex D with measurement examples for coaxial geometry samples; d) addition of a Bibliography; e) measurement examples for a planar sample have been moved from Clause 12 in IEC TS 62836 to Annex C.

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PDF Pages PDF Title
61 undefined
63 European foreword
Endorsement notice
65 English
CONTENTS
68 FOREWORD
70 INTRODUCTION
71 1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
3.2 Abbreviated terms
72 4 Principle of the method
74 Figures
Figure 1 – Principle of the PWP method
75 5 Samples
6 Electrode materials
7 Pressure pulse wave generation
76 8 Set-up of the measurement
Figure 2 – Measurement set-up for the PWP method
Figure 3 – Sample of circuit to protect the amplifier from damage by a small discharge on the sample
77 9 Calibrating the electric field
10 Measurement procedure
78 11 Data processing for experimental measurement
79 13 Impact of coaxial geometry
13.1 Measuring set-up of pressure wave propagation method for the coaxial geometry sample
80 13.2 Physical model in coaxial geometry
Figure 4 – Diagram of the pressure wave propagationmethod set-up for a coaxial sample
Figure 5 – Diagram of wave propagation of PWP for a coaxial geometry sample
81 13.3 Measuring conditions
82 13.4 Calibration of electric field for a coaxial sample
13.4.1 Summary
13.4.2 Linearity verification
13.4.3 Validity verification of the ratio between two current peaks
Figure 6 – Diagram of the propagation of pressure wave on the section of a cylinder
83 13.4.4 Method for retrieving internal electric field from the measured current signal
84 Figure 7 – Flowchart for the computation of the electric fieldin a coaxial sample from PWP measured currents
85 Annex A (informative)Preconditional method of the original signal forthe PWP method on a planar sample
A.1 Simple integration limitation
Figure A.1 – Comparison between practical and ideal pressure pulses
86 A.2 Analysis of the resiliency effect and correction procedure
Figure A.2 – Original signal of the sample free of charge under moderate voltage
87 A.3 Example of the correction procedure on a PE sample
Figure A.3 – Comparison between original and corrected reference signals with a sample free of charge under moderate voltage
88 A.4 Estimation of the correction coefficients
Figure A.4 – Electric field in a sample under voltage with spacecharge calculated from original and corrected signals
89 Figure A.5 – Geometrical characteristics of the referencesignal for the correction coefficient estimation
Figure A.6 – Reference signal corrected with coefficients graphically obtained and adjusted
90 A.5 MATLAB® code
Figure A.7 – Electric field in a sample under voltage with space charge calculated with graphically obtained coefficient and adjusted coefficient
Table A.1 – Variants of symbols used in the text
92 Annex B (informative)Linearity verification of the measuring system
B.1 Linearity verification
B.2 Sample conditions
B.3 Linearity verification procedure
B.4 Example of linearity verification
93 Figure B.1 – Voltage signals obtained from the oscilloscopeby the amplifier with different amplifications
Figure B.2 – Current signals induced by the sample, consideringthe input impedance and the amplification of the amplifier
94 Figure B.3 – Relationship between the measured current peakof the first electrode and applied voltage
95 Annex C (informative)Measurement examples for planar plaque samples
C.1 Samples
C.2 Pressure pulse generation
C.3 Calibration of sample and signal
Figure C.1 – Measured current signal under −5,8 kV
96 C.4 Testing sample and experimental results
C.4.1 Measurement results
Figure C.2 – First measured current signal (< 1 min)
Figure C.3 – Measured current signal after 1,5 h under −46,4 kV
97 C.4.2 Internal electric field distribution in the testing sample
Figure C.4 – Measured current signal without applied voltage after 1,5 h under −46,4 kV
Figure C.5 – Internal electric field distribution under −5,8 kV
98 Figure C.6 – Internal electric field distributionunder −46,4 kV, at the initial state
Figure C.7 – Internal electric field distribution after 1,5 h under −46,4 kV
99 C.4.3 Distribution of space charge density in the testing sample
Figure C.8 – Internal electric field distribution withoutapplied voltage after 1,5 h under −46,4 kV
100 Figure C.9 – Space charge distribution after 1,5 h under –46,4 kV
Figure C.10 – Space charge distribution without applied voltageafter 1,5 h under −46,4 kV
101 Annex D (informative)Measurement examples for coaxial geometry samples
D.1 Example of linearity verification of coaxial geometry
D.1.1 Sample conditions
D.1.2 Linearity verification procedure
D.1.3 Example of linearity verification
102 D.2 Verification of the current peak area ratio between the outer and inner electrodes
D.2.1 Verification principle
Figure D.1 – Measured currents from the LDPE coaxial sampleunder different applied voltages in a few minutes
Figure D.2 – Relationships between the peak amplitude of the measuredcurrent at outer and inner electrodes and applied voltage
103 D.2.2 Example of verification of the current peak area ratio
D.3 Testing sample and experimental results
D.3.1 Raw results of measurements
Figure D.3 – First measured current signal (< 1 min) for the coaxial sample
Table D.2 – Analysis of ratio between theoretical and measured peak area for measured current signal
104 Figure D.4 – Measured current signals for the coaxial sample at beginning and after 2 h under −90,0 kV
Figure D.5 – Measured current signals for the coaxial sample after 2 h under −90,0 kV, and without applied voltage after 2 h under high voltage
105 D.3.2 Electric field distribution in the coaxial sample
Figure D.6 – Internal electric field distribution under –22,5 kV for the coaxial sample
106 Figure D.7 – Internal electric field distribution under –90,0 kVfor the coaxial sample, at the initial state
Figure D.8 – Internal electric field distribution after 2 h under –90,0 kV
107 D.3.3 Space charge distribution in the coaxial sample
Figure D.9 – Internal electric field distribution withoutapplied voltage after 2 h under −90,0 kV
108 Figure D.10 – Space charge distribution with and withoutapplied voltage after 2 h under −90,0 kV
109 Bibliography

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