IEC 62836:2024

Measurement of internal electric field in insulating materials - Pressure wave propagation method

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.

Mesurage du champ électrique interne dans les matériaux isolants - Méthode de l'onde de pression

L’IEC 62836 :2024 fournit une procédure efficace et fiable pour évaluer le champ électrique interne dans les matériaux isolants utilisés pour les applications à haute tension, par la méthode de l'onde de pression (PWP). Cette méthode convient aux échantillons à géométrie plane et coaxiale constitués de matériaux isolants homogènes d'une épaisseur supérieure ou égale à 0,5 mm et aux champs électriques supérieurs à 1 kV/mm, mais elle dépend également de l'épaisseur de l'échantillon et du générateur d'ondes de pression.
Cette première édition annule et remplace l'IEC TS 62836 parue en 2020.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'IEC TS 62836:
a) ajout de l'Article 12 relatif au mesurage de la répartition des charges d'espace sur un échantillon plan;
b) ajout de l'Article 13 relatif aux échantillons à géométrie coaxiale;
c) ajout de l'Annexe D qui fournit des exemples de mesurages sur des échantillons à géométrie coaxiale;
d) ajout d'une Bibliographie;
e) les exemples de mesurages sur un échantillon plan ont été déplacés de l'Article 12 de l'IEC TS 62836 à l'Annexe C.

General Information

• Status: Published
• Publication Date: 27-Feb-2024
• ICS: 17.220.99 - Other standards related to electricity and magnetism
• ICS: 29.035.01 - Insulating materials in general
• Technical Committee: TC 112 - Evaluation and qualification of electrical insulating materials and systems
• Drafting Committee: WG 8 - TC 112/WG 8
• Current Stage: PPUB - Publication issued
• Start Date: 22-Mar-2024
• Completion Date: 28-Feb-2024

Relations

• Revises: IEC TR 62836:2013 - Measurement of internal electric field in insulating materials - Pressure wave propagation method
• Effective Date: 01-Mar-2024
• Revises: IEC TS 62836:2020 - Measurement of internal electric field in insulating materials - Pressure wave propagation method
• Effective Date: 05-Sep-2023

Standards Content (Sample)

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
...