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BSI PD IEC/TS 62758:2012

BSI PD IEC/TS 62758:2012

$167.15

Calibration of space charge measuring equipment based on the pulsed electroacoustic (PEA) measurement principle

Published By Publication Date Number of Pages
BSI 2012 40
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IEC 62758, which is a technical specification, presents a standard method to estimate the performance of a pulsed electro-acoustic (PEA) measurement system. For this purpose, a systematic procedure is recommended for the calibration of the measurement system. U sing the procedure, users can estimate whether the system works properly or not.

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PDF Pages PDF Title
4 CONTENTS
6 FOREWORD
8 INTRODUCTION
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Basic theory for measurement
4.1 Permittivity and induced charge density
4.2 Charge in dielectrics and Poisson’s law
11 4.3 Coulombic force of charge in electric field
4.4 Reflection and transmission of pressure wave
4.5 Maxwell stress
12 4.6 Response of linear system
5 Procedure to calibrate the space charge measurement
5.1 Principle of calibration
5.1.1 General
13 5.1.2 Typical result of calibration measurement
Figures
Figure 1 – Theoretical distributions for calibration measurement
14 5.2 Sample preparation
5.2.1 Sample for calibration measurement
Figure 2 – Typical result of calibration measurement
15 5.2.2 Sample placement
5.3 Data acquisition
5.3.1 Pulse voltage test
5.3.2 Averaging
Figure 3 – Drop of silicone oil and sample placement
Figure 4 – Pulse voltage application test
16 5.3.3 Data acquisition for calibration
Figure 5 – Dependence of averaging number
17 5.3.4 Signal obtained under short circuit condition
5.4 Data processing and calibration
5.4.1 Deconvolution
Figure 6 – Measurement of waveform for calibration
Figure 7 – Confirmation of absence of space charge accumulation during d.c. voltage application for calibration
18 5.4.2 Calibration for horizontal axis and calculation of waveform for electric field distribution
5.4.3 Calibration for electric field and charge density distributions
Figure 8 – Deconvolution and calibration
19 5.4.4 Confirmation of linearity of measurement
5.4.5 Typical test results by expert members of project team
Figure 9 – Calibration for electric field and charge density distributions
Figure 10 – Confirmation of linearity measurement
20 Figure 11 – Results of calibration test by research Group A
Figure 12 – Results of calibration test by research Group B
21 Figure 13 – Results of calibration test by research Group C
Figure 14 – Results of calibration test by research Group D
Figure 15 – Results of calibration test by research Group E
22 Table 1 – Measurement resolution
23 Annex A (informative) Theory of PEA method
24 Figure A.1 – Principle of acoustic wave generation in PEA method
26 Figure A.2 – Pressure wave propagation in PEA measurement system
27 Figure A.3 – Response of piezo-transducer
Figure A.4 – Transform from pressure to amount of charge induced on piezo-transducer
28 Figure A.5 – Relationship between the pulse width and thickness of piezo-transducer
29 Figure A.6 – Adequate spatial resolution
31 Figure A.7 – Example of two types of signal
32 Figure A.8 – Calculation flow for deconvolution
34 Figure A.10 – PEA measurement apparatus
35 Figure A.11 – Equivalent circuit for voltage application
36 Figure A.12 – Equivalent circuit for signal detection
37 Bibliography

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BSI PD IEC/TS 62758:2012
$167.15