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BSI PD IEC TS 62836:2020

BSI PD IEC TS 62836:2020

$142.49

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

Published By Publication Date Number of Pages
BSI 2020 32
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This document provides an efficient and reliable procedure to test the internal electric field in the insulating materials used for high-voltage applications, using the pressure wave propagation (PWP) method. It is suitable for a sample with homogeneous insulating materials 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.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
6 FOREWORD
8 INTRODUCTION
9 1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
3.2 Abbreviated terms
10 4 Principle of the method
11 Figures
Figure 1 – Principle of the PWP method
12 5 Samples
6 Electrode materials
7 Pressure pulse wave generation
13 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
14 9 Calibrating the electric field
10 Measurement procedure
15 11 Data processing for the experimental measurement
16 12 Measurement examples
12.1 Samples
12.2 Pressure pulse generation
12.3 Calibration of sample and signal
Figure 4 – Measured current signal under –5,8 kV
17 12.4 Testing sample and experimental results
Figure 5 – First measured current signal (< 1 min)
Figure 6 – Measured current signal under –46,4 kV, after 1,5 h under high voltage
18 Figure 7 – Measured current signal without applied voltage, after 1,5 h under high voltage
Figure 8 – Internal electric field distribution under –5,8 kV
19 Figure 9 – Internal electric field distribution under –46,4 kV, at the initial state
Figure 10 – Internal electric field distribution under –46,4 kV, after 1,5 h under high voltage
20 Figure 11 – Internal electric field distribution without applied voltage after 1,5 h under high voltage
21 Annex A (informative)Preconditional method of the original signal for the PWP method
A.1 Simple integration limitation
Figure A.1 – Comparison between practical and perfect pressure pulses
22 A.2 Analysis of the resiliency effect and correction procedure
Figure A.2 – Original signal of the sample free of charge under moderate voltage
23 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
24 A.4 Estimation of the correction coefficients
Figure A.4 – Electric field in a sample under voltage with space charge calculated from original and corrected signals
25 Figure A.5 – Geometrical characteristics of the reference signal for the correction coefficient estimation
Figure A.6 – Reference signal corrected with coefficients graphically obtained and adjusted
26 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
28 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
29 Figure B.1 – Voltage signals obtained from the oscilloscope by the amplifier with different amplifications
Figure B.2 – Current signals induced by the sample, considering the input impedance and the amplification of the amplifier
30 Figure B.3 – Relationship between the measured current peak of the first electrode and applied voltage

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BSI PD IEC TS 62836:2020
$142.49