Applicable to the off-line electrical measurement of partial discharges (PD) that occur in electrical insulation systems (EIS) when stressed by repetitive voltage impulses having a rise time of 50 us or less. Typical applications are EIS belonging to apparatus driven by power electronics, such as motors. Excluded are – methods based on optical or ultrasonic PD detection, – fields of application for PD measurements when stressed by non-repetitive impulse voltages.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 4<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 4 Measurement of partial discharge pulses during repetitive, short-rise time, voltage impulses and comparison with power frequency 4.1 Measurement frequency <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 4.2 Measurement quantities 4.3 Test objects <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4.4 Effect of testing conditions <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 5 PD detection methods 5.1 General 5.2 PD pulse coupling and detection devices <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Figure 1 \u2013 Coupling capacitor with multipole filter Figure 2 \u2013 Example of voltage impulse and PD pulse frequency spectra before and after filtering <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | Figure 3 \u2013 HFCT with multipole filter Figure 4 \u2013 HFCT between test object and earth with multipole filter Figure 5 \u2013 Circuit using an electromagnetic coupler (for example an antenna) to suppress impulses from the test supply <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | Figure 6 \u2013 Example of waveforms of repetitive bipolar impulse voltage and charge accumulation for on twisted-pair sample Figure 7 \u2013 Charge measurements <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.3 Source-controlled gating techniques 6 Display methods Figure 8 \u2013 Example of PD detection using electronic source-controlled gating (other PD coupling devices can be used) <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 7 Sensitivity of PD measurement <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 8 Test circuits 9 Test procedures 10 Test report <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Annex A (informative) Indications on the voltage impulse suppression action required by the coupling device Figure A.1 \u2013 Schematic example of overlap between voltage impulse and PD pulse spectra (dotted area) Figure A.2 \u2013 Schematic example of voltage impulse and PD pulse spectra after filtering <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Figure A.3 \u2013 Example of impulse voltage damping as a function of impulse voltage magnitude and rise time <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Annex B (informative) PD pulses extracted from a supply voltage impulse through filtering techniques Figure B.1 \u2013 Power supply waveform and recorded PD pulses measured using an antenna during supply voltage commutation <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Figure B.2 \u2013 Partial discharge pulses detected by an antenna from the record of Figure B.1, using a filtering technique (400 MHz high-pass filter) Figure B.3 \u2013 Characteristic of the filter used to pass from Figure B.1 to Figure B.2 <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Electrical insulating materials and systems. Electrical measurement of partial discharges (PD) under short rise time and repetitive voltage impulses<\/b><\/p>\n |