This document provides an off-line measurement method of the partial discharge inception and extinction voltage on winding insulation under repetitive impulse voltage. This document is relevant to rotating machines supplied by a voltage source converter.<\/p>\n
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| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 1 Scope 2 Normative references 3 Terms, definitions, symbols and abbreviated terms <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 4 Repetitive impulse voltages for PD measurement 4.1 General Figures Figure 1 \u2013 Block representation of measurement circuit for RPDIV and RPDEV <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 4.2 Waveform of single impulse voltage 4.2.1 Waveform at impulse generator terminal without test object Figure 2 \u2013 Simplified impulse generator (IG) circuit with a single switch S <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | Figure 3 \u2013 Output voltage at open terminal of IG with single switch Figure 4 \u2013 Two impulses at open terminal of IG with single switch Figure 5 \u2013 Simplified IG circuit with four-arm (switch) bridge circuit <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 4.2.2 Typical distortions of impulse waveform at the terminals of test object Figure 6 \u2013 Output voltages at open terminal of four-arm bridge circuit <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | Figure 7 \u2013 Increase of rise time and decrease of peak voltage of triangular impulse Figure 8 \u2013 Increase of rise time and decrease of peak voltage of rectangular impulse Figure 9 \u2013 Overshoot of peak and following fast oscillation of triangular impulse <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Figure 10 \u2013 Overshoot of peak and following fast oscillation of rectangular impulse Figure 11 \u2013 Typical “ringing” observed during bipolar rectangular voltage test <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 4.3 Train of single impulse voltage Figure 12 \u2013 Slow oscillating decay of triangular impulse Figure 13 \u2013 Slow oscillating decay of rectangular impulse <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 4.4 Step-by-step voltage increase and decrease using trains of single impulse voltage Figure 14 \u2013 Schematic representation of train parameters of positive unipolar impulses Figure 15 \u2013 Schematic representation of train parameters of bipolar impulses <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Figure 16 \u2013 SBS parameters of positive unipolar impulses Figure 17 \u2013 SBS voltage pattern of positive unipolar impulses for RPDIV and RPDEV <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Figure 18 \u2013 SBS voltage pattern of bipolarly distorted positive unipolar impulse Figure 19 \u2013 SBS voltage increase of bipolar impulses <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Figure 20 \u2013 Representative scheme of conditioningprocedure before RPDIV measurement Tables Table 1 \u2013 Typical ranges of impulse voltage parameters at terminal of test object to be reported <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 4.5 Impulse voltage distribution inside rotating machines <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 5 PD measurement methods with impulse voltage 5.1 General 5.2 Electrical PD measurements 5.2.1 General 5.2.2 Coupling capacitor with higher order analogue filter Figure 21 \u2013 Schematic representation of phase\/phase, phase\/ground and turn\/turn voltages of the winding of a rotating machine fed from a two-level converter [2] <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 5.2.3 HFCT with higher order analogue filter Figure 22 \u2013 Coupling capacitor with higher order analogue filter Figure 23 \u2013 Example of voltage impulse and PD pulse frequency spectrabefore (left) and after (right) filtering <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 5.2.4 Electromagnetic couplers Figure 24 \u2013 HFCT between supply and test object with higher order analogue filter Figure 25 \u2013 HFCT between test object and earth with higher order analogue filter Figure 26 \u2013 Circuit using an electromagnetic coupler (for example an antenna) to suppress impulses from the test supply <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 5.3 Threshold level of PD detection Figure 27 \u2013 Circuit using an electromagnetic UHF antenna Figure 28 \u2013 Schematic representation of noise, disturbance and threshold values <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 5.4 Measuring system with impulse generator and computer 5.5 Calculation and interpretation of RPDIV and RPDEV Figure 29 \u2013 Example diagram of PD measurements with PC <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 6 Impulse PD test procedure 6.1 Test object 6.1.1 Twisted-pair or equivalent Figure 30 \u2013 Example of RPDIV and RPDEV calculation usinga 50 % PD probability against repetitive impulse voltage(Figure 12 of IEC TS 61934:2011, modified) <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | 6.1.2 Motorette or formette 6.1.3 Complete winding and connection <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Figure 31 \u2013 Representative scheme of voltage terminalsfor three-terminal machine and four-terminal machine Table 2 \u2013 Connection of complete winding of three-terminal machine <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | 6.2 Safety and environment during PD test 6.2.1 Grounding and floating of test objects during tests 6.2.2 Environment during test Table 3 \u2013 Connection of complete winding of four-terminal machine <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | 6.3 Test procedure and reports <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Annex A (informative)Typical PD measurements on a complete winding Figure A.1 \u2013 Block diagram of PD measurement system used in RRT Figure A.2 \u2013 Impulse pattern used in RRT and PD inception Table A.1 \u2013 Parameters used in RRT <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Annex B (informative)Example of PD data analysis using phase angle Figure B.1 \u2013 Example of PD phase angle pattern of sinusoidal voltage <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Figure B.2 \u2013 Example of PD phase angle pattern of PWMvoltage on the phase angle of a sinusoidal one Figure B.3 \u2013 Example of PD phase angle pattern of PWMvoltage on rectangular voltage angle (PRPD pattern) <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Annex C (informative)Example of connection of complete windings C.1 General C.2 Connections for three-terminal machines Figure C.1 \u2013 Connection of six-terminal machines Figure C.2 \u2013 Connection of three- or four-terminal machines (with N terminal) <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | Figure C.3 \u2013 Three-terminal machine connection, Type A (Table 2) Figure C.4 \u2013 Three-terminal machine connection, Type B (Table 2) Figure C.5 \u2013 Three-terminal machine connection, Type C (Table 2) <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | Figure C.6 \u2013 Three-terminal machine connection, Type D (Table 2) Figure C.7 \u2013 Three-terminal machine connection, Type E (Table 2) Figure C.8 \u2013 Three-terminal machine connection, Type F (Table 2) <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | C.3 Connections for four-terminal machines Figure C.9 \u2013 Four-terminal machine with earthed N terminal \u2013 Connection types (Table 3) <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Annex D (informative)Example of SBS voltage increase pattern of repetitive impulse Figure D.1 \u2013 SBS voltage increase of alternating train of unipolar impulses <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Rotating electrical machines – Off-line measurement of partial discharge inception voltage on winding insulation under repetitive impulse voltage<\/b><\/p>\n |