IEC 62836:2024

IEC 62836 ®
Edition 1.0 2024-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Measurement of internal electric field in insulating materials – Pressure wave
propagation method
Mesurage du champ électrique interne dans les matériaux isolants – Méthode de
l'onde de pression
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IEC 62836 ®
Edition 1.0 2024-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Measurement of internal electric field in insulating materials – Pressure wave

propagation method
Mesurage du champ électrique interne dans les matériaux isolants – Méthode

de l'onde de pression
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.99, 29.035.01 ISBN 978-2-8322-8338-7

– 2 – IEC 62836:2024 © IEC 2024
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 8
4 Principle of the method . 9
5 Samples . 12
6 Electrode materials . 12
7 Pressure pulse wave generation . 12
8 Set-up of the measurement. 13
9 Calibrating the electric field . 14
10 Measurement procedure . 14
11 Data processing for experimental measurement . 15
12 Space charge distribution measurement . 16
13 Impact of coaxial geometry . 16
13.1 Measuring set-up of pressure wave propagation method for the coaxial
geometry sample . 16
13.2 Physical model in coaxial geometry . 17
13.3 Measuring conditions . 18
13.4 Calibration of electric field for a coaxial sample . 19
13.4.1 Summary . 19
13.4.2 Linearity verification . 19
13.4.3 Validity verification of the ratio between two current peaks . 19
13.4.4 Method for retrieving internal electric field from the measured current
signal . 20
Annex A (informative) Preconditional method of the original signal for the PWP
method on a planar sample . 22
A.1 Simple integration limitation . 22
A.2 Analysis of the resiliency effect and correction procedure . 23
A.3 Example of the correction procedure on a PE sample . 24
A.4 Estimation of the correction coefficients . 25

A.5 MATLAB® code . 27
Annex B (informative) Linearity verification of the measuring system . 29
B.1 Linearity verification . 29
B.2 Sample conditions. 29
B.3 Linearity verification procedure . 29
B.4 Example of linearity verification. 29
Annex C (informative) Measurement examples for planar plaque samples . 32
C.1 Samples. 32
C.2 Pressure pulse generation . 32
C.3 Calibration of sample and signal . 32
C.4 Testing sample and experimental results . 33
C.4.1 Measurement results . 33

C.4.2 Internal electric field distribution in the testing sample . 34
C.4.3 Distribution of space charge density in the testing sample . 36
Annex D (informative) Measurement examples for coaxial geometry samples . 38
D.1 Example of linearity verification of coaxial geometry . 38
D.1.1 Sample conditions . 38
D.1.2 Linearity verification procedure . 38
D.1.3 Example of linearity verification . 38
D.2 Verification of the current peak area ratio between the outer and inner
electrodes . 39
D.2.1 Verification principle . 39
D.2.2 Example of verification of the current peak area ratio . 40
D.3 Testing sample and experimental results . 40
D.3.1 Raw results of measurements . 40
D.3.2 Electric field distribution in the coaxial sample . 42
D.3.3 Space charge distribution in the coaxial sample . 44
Bibliography . 46

Figure 1 – Principle of the PWP method . 11
Figure 2 – Measurement set-up for the PWP method . 13
Figure 3 – Sample of circuit to protect the amplifier from damage by a small discharge
on the sample . 13
Figure 4 – Diagram of the pressure wave propagation method set-up for a coaxial
sample . 17
Figure 5 – Diagram of wave propagation of PWP for a coaxial geometry sample . 17
Figure 6 – Diagram of the propagation of pressure wave on the section of a cylinder . 19
Figure 7 – Flowchart for the computation of the electric field in a coaxial sample from
PWP measured currents . 21
Figure A.1 – Comparison between practical and ideal pressure pulses . 22
Figure A.2 – Original signal of the sample free of charge under moderate voltage . 23
Figure A.3 – Comparison between original and corrected reference signals with a
sample free of charge under moderate voltage . 24
Figure A.4 – Electric field in a sample under voltage with space charge calculated from
original and corrected signals
...