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PD IEC TS 60034-27-5:2021 Rotating electrical machines - Off-line measurement of partial discharge inception voltage on winding insulation under repetitive impulse voltage, 2021
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- CONTENTS
- FOREWORD
- INTRODUCTION
- 1 Scope
- 2 Normative references
- 3 Terms, definitions, symbols and abbreviated terms
- 4 Repetitive impulse voltages for PD measurement [Go to Page]
- 4.1 General
- Figures [Go to Page]
- Figure 1 – Block representation of measurement circuit for RPDIV and RPDEV
- 4.2 Waveform of single impulse voltage [Go to Page]
- 4.2.1 Waveform at impulse generator terminal without test object
- Figure 2 – Simplified impulse generator (IG) circuit with a single switch S
- Figure 3 – Output voltage at open terminal of IG with single switch
- Figure 4 – Two impulses at open terminal of IG with single switch
- Figure 5 – Simplified IG circuit with four-arm (switch) bridge circuit [Go to Page]
- 4.2.2 Typical distortions of impulse waveform at the terminals of test object
- Figure 6 – Output voltages at open terminal of four-arm bridge circuit
- Figure 7 – Increase of rise time and decrease of peak voltage of triangular impulse
- Figure 8 – Increase of rise time and decrease of peak voltage of rectangular impulse
- Figure 9 – Overshoot of peak and following fast oscillation of triangular impulse
- Figure 10 – Overshoot of peak and following fast oscillation of rectangular impulse
- Figure 11 – Typical "ringing" observed during bipolar rectangular voltage test
- 4.3 Train of single impulse voltage
- Figure 12 – Slow oscillating decay of triangular impulse
- Figure 13 – Slow oscillating decay of rectangular impulse
- 4.4 Step-by-step voltage increase and decrease using trains of single impulse voltage
- Figure 14 – Schematic representation of train parameters of positive unipolar impulses
- Figure 15 – Schematic representation of train parameters of bipolar impulses
- Figure 16 – SBS parameters of positive unipolar impulses
- Figure 17 – SBS voltage pattern of positive unipolar impulses for RPDIV and RPDEV
- Figure 18 – SBS voltage pattern of bipolarly distorted positive unipolar impulse
- Figure 19 – SBS voltage increase of bipolar impulses
- Figure 20 – Representative scheme of conditioningprocedure before RPDIV measurement
- Tables [Go to Page]
- Table 1 – Typical ranges of impulse voltage parameters at terminal of test object to be reported
- 4.5 Impulse voltage distribution inside rotating machines
- 5 PD measurement methods with impulse voltage [Go to Page]
- 5.1 General
- 5.2 Electrical PD measurements [Go to Page]
- 5.2.1 General
- 5.2.2 Coupling capacitor with higher order analogue filter
- Figure 21 – 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] [Go to Page]
- 5.2.3 HFCT with higher order analogue filter
- Figure 22 – Coupling capacitor with higher order analogue filter
- Figure 23 – Example of voltage impulse and PD pulse frequency spectrabefore (left) and after (right) filtering [Go to Page]
- 5.2.4 Electromagnetic couplers
- Figure 24 – HFCT between supply and test object with higher order analogue filter
- Figure 25 – HFCT between test object and earth with higher order analogue filter
- Figure 26 – Circuit using an electromagnetic coupler (for example an antenna) to suppress impulses from the test supply
- 5.3 Threshold level of PD detection
- Figure 27 – Circuit using an electromagnetic UHF antenna
- Figure 28 – Schematic representation of noise, disturbance and threshold values
- 5.4 Measuring system with impulse generator and computer
- 5.5 Calculation and interpretation of RPDIV and RPDEV
- Figure 29 – Example diagram of PD measurements with PC
- 6 Impulse PD test procedure [Go to Page]
- 6.1 Test object [Go to Page]
- 6.1.1 Twisted-pair or equivalent
- Figure 30 – Example of RPDIV and RPDEV calculation usinga 50 % PD probability against repetitive impulse voltage(Figure 12 of IEC TS 61934:2011, modified) [Go to Page]
- 6.1.2 Motorette or formette
- 6.1.3 Complete winding and connection
- Figure 31 – Representative scheme of voltage terminalsfor three-terminal machine and four-terminal machine
- Table 2 – Connection of complete winding of three-terminal machine
- 6.2 Safety and environment during PD test [Go to Page]
- 6.2.1 Grounding and floating of test objects during tests
- 6.2.2 Environment during test
- Table 3 – Connection of complete winding of four-terminal machine
- 6.3 Test procedure and reports
- Annex A (informative)Typical PD measurements on a complete winding [Go to Page]
- Figure A.1 – Block diagram of PD measurement system used in RRT
- Figure A.2 – Impulse pattern used in RRT and PD inception
- Table A.1 – Parameters used in RRT
- Annex B (informative)Example of PD data analysis using phase angle [Go to Page]
- Figure B.1 – Example of PD phase angle pattern of sinusoidal voltage
- Figure B.2 – Example of PD phase angle pattern of PWMvoltage on the phase angle of a sinusoidal one
- Figure B.3 – Example of PD phase angle pattern of PWMvoltage on rectangular voltage angle (PRPD pattern)
- Annex C (informative)Example of connection of complete windings [Go to Page]
- C.1 General
- C.2 Connections for three-terminal machines
- Figure C.1 – Connection of six-terminal machines
- Figure C.2 – Connection of three- or four-terminal machines (with N terminal)
- Figure C.3 – Three-terminal machine connection, Type A (Table 2)
- Figure C.4 – Three-terminal machine connection, Type B (Table 2)
- Figure C.5 – Three-terminal machine connection, Type C (Table 2)
- Figure C.6 – Three-terminal machine connection, Type D (Table 2)
- Figure C.7 – Three-terminal machine connection, Type E (Table 2)
- Figure C.8 – Three-terminal machine connection, Type F (Table 2)
- C.3 Connections for four-terminal machines
- Figure C.9 – Four-terminal machine with earthed N terminal – Connection types (Table 3)
- Annex D (informative)Example of SBS voltage increase pattern of repetitive impulse [Go to Page]
- Figure D.1 – SBS voltage increase of alternating train of unipolar impulses
- Bibliography [Go to Page]
