IEC TS 62836:2020

IEC TS 62836 ®
Edition 1.0 2020-11
TECHNICAL
SPECIFICATION
colour
inside
Measurement of internal electric field in insulating materials – Pressure wave
propagation method
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IEC TS 62836 ®
Edition 1.0 2020-11
TECHNICAL
SPECIFICATION
colour
inside
Measurement of internal electric field in insulating materials – Pressure wave

propagation method
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.220.99; 29.035.01 ISBN 978-2-8322-8993-8

– 2 – IEC TS 62836:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms . 7
4 Principle of the method . 8
5 Samples . 10
6 Electrode materials . 10
7 Pressure pulse wave generation . 10
8 Set-up of the measurement. 11
9 Calibrating the electric field . 12
10 Measurement procedure . 12
11 Data processing for the experimental measurement . 13
12 Measurement examples . 14
12.1 Samples. 14
12.2 Pressure pulse generation . 14
12.3 Calibration of sample and signal . 14
12.4 Testing sample and experimental results . 15
Annex A (informative) Preconditional method of the original signal for the PWP
method . 19
A.1 Simple integration limitation . 19
A.2 Analysis of the resiliency effect and correction procedure . 20
A.3 Example of the correction procedure on a PE sample . 21
A.4 Estimation of the correction coefficients . 22 ®
A.5 MATLAB code . 24
Annex B (informative) Linearity verification of the measuring system . 26
B.1 Linearity verification . 26
B.2 Sample conditions. 26
B.3 Linearity verification procedure . 26
B.4 Example of linearity verification. 26

Figure 1 – Principle of the PWP method . 9
Figure 2 – Measurement set-up for the PWP method . 11
Figure 3 – Sample of circuit to protect the amplifier from damage by a small discharge
on the sample . 11
Figure 4 – Measured current signal under –5,8 kV . 14
Figure 5 – First measured current signal (< 1 min) . 15
Figure 6 – Measured current signal under –46,4 kV, after 1,5 h under high voltage . 15
Figure 7 – Measured current signal without applied voltage, after 1,5 h under high
voltage . 16
Figure 8 – Internal electric field distribution under –5,8 kV . 16
Figure 9 – Internal electric field distribution under –46,4 kV, at the initial state . 17

Figure 10 – Internal electric field distribution under –46,4 kV, after 1,5 h under high
voltage . 17
Figure 11 – Internal electric field distribution without applied voltage after 1,5 h under

high voltage . 18
Figure A.1 – Comparison between practical and perfect pressure pulses . 19
Figure A.2 – Original signal of the sample free of charge under moderate voltage . 20
Figure A.3 – Comparison between original and corrected reference signals with a
sample free of charge under moderate voltage . 21
Figure A.4 – Electric field in a sample under voltage with space charge calculated
from original and corrected signals . 22
Figure A.5 – Geometrical characteristics of the reference signal for the correction

coefficient estimation . 23
Figure A.6 – Reference signal corrected with coefficients graphically obtained and
adjusted . 23
Figure A.7 – Electric field in a sample under voltage with space charge calculated with
graphically obtained coefficient and adjusted coefficient . 24
Figure B.1 – Voltage signals obtained from the oscilloscope by the amplifier with

different amplifications . 27
Figure B.2 – Current signals induced by the sample, considering the input impedance
and the amplification of the amplifier . 27
Figure B.3 – Relationship between the measured current peak of the first electrode
and applied voltage . 28

Table A.1 – Variants of symbols used in the text . 24

– 4 – IEC TS 62836:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MEASUREMENT OF INTERNAL ELECTRIC FIELD IN INSULATING
MATERIALS – PRESSURE WAVE PROPAGATION METHOD

FOREWORD
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IEC TS 62836 has been prepared by IEC technical committee 112: Evaluation and qualification
of electrical insulating materials and systems. It is a Technical Specification
The text of this Technical Specification is based on the following documents:
Draft Report on voting
112/472/DTS 112/499/
...