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BS EN IEC 62836:2024 - TC Tracked Changes. Measurement of internal electric field in insulating materials. Pressure wave propagation method, 2024
- A-30450428.pdf [Go to Page]
- undefined
- European foreword
- Endorsement notice [Go to Page]
- English [Go to Page]
- 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 experimental measurement
- 13 Impact of coaxial geometry [Go to Page]
- 13.1 Measuring set-up of pressure wave propagation method for the coaxial geometry sample
- 13.2 Physical model in coaxial geometry
- Figure 4 – Diagram of the pressure wave propagationmethod set-up for a coaxial sample
- Figure 5 – Diagram of wave propagation of PWP for a coaxial geometry sample
- 13.3 Measuring conditions
- 13.4 Calibration of electric field for a coaxial sample [Go to Page]
- 13.4.1 Summary
- 13.4.2 Linearity verification
- 13.4.3 Validity verification of the ratio between two current peaks
- Figure 6 – Diagram of the propagation of pressure wave on the section of a cylinder [Go to Page]
- 13.4.4 Method for retrieving internal electric field from the measured current signal
- Figure 7 – Flowchart for the computation of the electric fieldin a coaxial sample from PWP measured currents
- Annex A (informative)Preconditional method of the original signal forthe PWP method on a planar sample [Go to Page]
- A.1 Simple integration limitation
- Figure A.1 – Comparison between practical and ideal 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 spacecharge calculated from original and corrected signals
- Figure A.5 – Geometrical characteristics of the referencesignal 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 oscilloscopeby the amplifier with different amplifications
- Figure B.2 – Current signals induced by the sample, consideringthe input impedance and the amplification of the amplifier
- Figure B.3 – Relationship between the measured current peakof the first electrode and applied voltage
- Annex C (informative)Measurement examples for planar plaque samples [Go to Page]
- C.1 Samples
- C.2 Pressure pulse generation
- C.3 Calibration of sample and signal
- Figure C.1 – Measured current signal under −5,8 kV
- C.4 Testing sample and experimental results [Go to Page]
- C.4.1 Measurement results
- Figure C.2 – First measured current signal (< 1 min)
- Figure C.3 – Measured current signal after 1,5 h under −46,4 kV [Go to Page]
- C.4.2 Internal electric field distribution in the testing sample
- Figure C.4 – Measured current signal without applied voltage after 1,5 h under −46,4 kV
- Figure C.5 – Internal electric field distribution under −5,8 kV
- Figure C.6 – Internal electric field distributionunder −46,4 kV, at the initial state
- Figure C.7 – Internal electric field distribution after 1,5 h under −46,4 kV [Go to Page]
- C.4.3 Distribution of space charge density in the testing sample
- Figure C.8 – Internal electric field distribution withoutapplied voltage after 1,5 h under −46,4 kV
- Figure C.9 – Space charge distribution after 1,5 h under –46,4 kV
- Figure C.10 – Space charge distribution without applied voltageafter 1,5 h under −46,4 kV
- Annex D (informative)Measurement examples for coaxial geometry samples [Go to Page]
- D.1 Example of linearity verification of coaxial geometry [Go to Page]
- D.1.1 Sample conditions
- D.1.2 Linearity verification procedure
- D.1.3 Example of linearity verification
- D.2 Verification of the current peak area ratio between the outer and inner electrodes [Go to Page]
- D.2.1 Verification principle
- Figure D.1 – Measured currents from the LDPE coaxial sampleunder different applied voltages in a few minutes
- Figure D.2 – Relationships between the peak amplitude of the measuredcurrent at outer and inner electrodes and applied voltage [Go to Page]
- D.2.2 Example of verification of the current peak area ratio
- D.3 Testing sample and experimental results [Go to Page]
- D.3.1 Raw results of measurements
- Figure D.3 – First measured current signal (< 1 min) for the coaxial sample
- Table D.2 – Analysis of ratio between theoretical and measured peak area for measured current signal [Go to Page]
- Figure D.4 – Measured current signals for the coaxial sample at beginning and after 2 h under −90,0 kV
- Figure D.5 – Measured current signals for the coaxial sample after 2 h under −90,0 kV, and without applied voltage after 2 h under high voltage [Go to Page]
- D.3.2 Electric field distribution in the coaxial sample
- Figure D.6 – Internal electric field distribution under –22,5 kV for the coaxial sample
- Figure D.7 – Internal electric field distribution under –90,0 kVfor the coaxial sample, at the initial state
- Figure D.8 – Internal electric field distribution after 2 h under –90,0 kV [Go to Page]
- D.3.3 Space charge distribution in the coaxial sample
- Figure D.9 – Internal electric field distribution withoutapplied voltage after 2 h under −90,0 kV
- Figure D.10 – Space charge distribution with and withoutapplied voltage after 2 h under −90,0 kV
- Bibliography [Go to Page]
