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PD IEC TS 62836:2020 Measurement of internal electric field in insulating materials. Pressure wave propagation method, 2020
- undefined
- CONTENTS
- FOREWORD
- INTRODUCTION
- 1 Scope
- 2 Normative references
- 3 Terms, definitions and abbreviated terms [Go to Page]
- 3.1 Terms and definitions
- 3.2 Abbreviated terms
- 4 Principle of the method
- Figures [Go to Page]
- Figure 1 – Principle of the PWP method
- 5 Samples
- 6 Electrode materials
- 7 Pressure pulse wave generation
- 8 Set-up of the measurement [Go to Page]
- 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
- 9 Calibrating the electric field
- 10 Measurement procedure
- 11 Data processing for the experimental measurement
- 12 Measurement examples [Go to Page]
- 12.1 Samples
- 12.2 Pressure pulse generation
- 12.3 Calibration of sample and signal
- Figure 4 – Measured current signal under –5,8 kV
- 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
- 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
- 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
- Figure 11 – Internal electric field distribution without applied voltage after 1,5 h under high voltage
- Annex A (informative)Preconditional method of the original signal for the PWP method [Go to Page]
- A.1 Simple integration limitation
- Figure A.1 – Comparison between practical and perfect pressure pulses
- A.2 Analysis of the resiliency effect and correction procedure
- Figure A.2 – Original signal of the sample free of charge under moderate voltage
- 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
- 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
- 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
- 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
- Annex B (informative)Linearity verification of the measuring system [Go to Page]
- B.1 Linearity verification
- B.2 Sample conditions
- B.3 Linearity verification procedure
- B.4 Example of linearity verification
- 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
- Figure B.3 – Relationship between the measured current peak of the first electrode and applied voltage [Go to Page]
