BSI PD IEC TR 63434:2023
$167.15
Low voltage switchgear and controlgear. Partial discharge voltages and PD-level in low voltage switchgear and controlgear
| Published By | Publication Date | Number of Pages |
| BSI | 2023 | 44 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 4 | CONTENTS |
| 6 | FOREWORD |
| 8 | INTRODUCTION |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions |
| 12 | 4 Basic information (physics) 4.1 Discharge phenomena 4.1.1 General 4.1.2 Homogeneous electric fields |
| 13 | 4.1.3 Inhomogeneous electric fields Figures Figure 1 – Temperature dependent variation of the breakdown field strength Êd of air per Equation (1), α = 0,8, θ = 20 °C, p = p0 = 1 013 mbar |
| 14 | Figure 2 – Inception voltage Ui,RMS depending on the electrode radius r, R ≫ r Tables Table 1 – Relationship between electrode radius r and corona inception voltage Ui,RMS |
| 15 | Figure 3 – Maximum electrical field strength Ê depending on the electrode edge radius r Figure 4 – Paschen curve Êd = f (p × d) for air |
| 16 | 4.2 Dimensioning examples 4.2.1 General |
| 17 | Figure 5 – Principle terminal / contact arrangement of a 3-pole device,capacitive voltage divider |
| 19 | 4.2.2 Influence of design and temperature on a series connection of clearances and solid insulation for AC voltage |
| 21 | Figure 6 – Field strength in the air gap, inhomogeneous, η = 0,5 , εr2 = 4, cold state Figure 7 – Field strength in the solid insulation, inhomogeneous, η = 0,5, εr2 = 4, cold state |
| 22 | Figure 8 – Field strength in the air gap, inhomogeneous, ƞ = 0,5, εr2 = 12at 130 °C operational temperature Figure 9 – Field strength in the solid insulation, inhomogeneous,ƞ = 0,5, εr2 = 12 operational temperature |
| 23 | Figure 10 – Gaps and voids in a solid andcombined solid / gaseous insulation [7] |
| 24 | Table 2 – Ranking of the internal field strength of different gap and void shapes [7] |
| 25 | Figure 11 – Model of a void of thickness t in an insulation wallof defined thickness d [20] |
| 26 | 4.2.3 Series connection of clearances and solid insulation by design for DC voltage 4.2.4 Solid insulation – dimensioning – material characteristics Figure 12 – Principle arrangement of electrodes and insulation wallsof a 3-pole device |
| 27 | Figure 13 – Permissible field strength for dimensioning ofsolid insulation according to Equation (18) |
| 28 | Figure 14 – Breakdown at high frequency, solid insulation; d = 0,75 mm [23] |
| 29 | Figure 15 – Breakdown at high frequency, solid insulation, influence of humidity; conditioning at 50 °C; 1: mica-filled phenolic, d = 0,75 mm;2: glass-silicone laminate, d = 1,5 mm [24] |
| 30 | Figure 16 – Dielectric strength Êd of different types of thermoplasticinsulation material depending on the temperature |
| 31 | 5 Application rules 5.1 General Figure 17 – Dielectric strength Ed,RMS of PA6-GF30 in dry and moist condition (equilibrium moisture content at 23 °C/50 % RH) depending on the temperature θ (°C) |
| 32 | 5.2 Partial discharge considerations 5.3 Measures to prevent/reduce the probability of partial discharges |
| 33 | Annex A (informative)Research on partial discharge in low-voltage switchgear and controlgear A.1 General A.2 Investigations on switchgear Figure A.1 – Example of phase resolved partial discharge measurement on a MPSD atroom temperature and at elevated operational temperatures |
| 34 | Figure A.2 – PD Testing (690 V, basic insulation, 20°C) Table A.1 – Inception Ui and extinction Ue voltage depending onthe temperature as per Figure A.1 and Figure A.2 Table A.2 – Maximum discharge values and number of events observed atthe test voltage as per Figure A.1 and Figure A.2 |
| 35 | Figure A.3 – Inception (Ui) and extinction (Ue) voltage during partial discharge measurements on motor protection switching devices (MPSD)at elevated temperatures |
| 36 | Table A.3 – Ratings and design parameters of the investigatedmotor protection switching devices (MPSD) |
| 37 | A.3 Reference to other products relevant for applications Table A.4 – Partial Discharge (PD) acceptance levels in different IEC documents |
| 38 | Annex B (informative)Voltage factors when considering partial discharge effects |
| 39 | Table B.1 – Coordination of rated RMS voltage with partialdischarge voltage and extinction voltage |
| 40 | Bibliography |
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