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BSI PD IEC TS 60034-27-5:2021

BSI PD IEC TS 60034-27-5:2021

$189.07

Rotating electrical machines – Off-line measurement of partial discharge inception voltage on winding insulation under repetitive impulse voltage

Published By Publication Date Number of Pages
BSI 2021 46
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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.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
7 FOREWORD
9 INTRODUCTION
10 1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms
13 4 Repetitive impulse voltages for PD measurement
4.1 General
Figures
Figure 1 – Block representation of measurement circuit for RPDIV and RPDEV
14 4.2 Waveform of single impulse voltage
4.2.1 Waveform at impulse generator terminal without test object
Figure 2 – Simplified impulse generator (IG) circuit with a single switch S
15 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
16 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
17 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
18 Figure 10 – Overshoot of peak and following fast oscillation of rectangular impulse
Figure 11 – Typical “ringing” observed during bipolar rectangular voltage test
19 4.3 Train of single impulse voltage
Figure 12 – Slow oscillating decay of triangular impulse
Figure 13 – Slow oscillating decay of rectangular impulse
20 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
21 Figure 16 – SBS parameters of positive unipolar impulses
Figure 17 – SBS voltage pattern of positive unipolar impulses for RPDIV and RPDEV
22 Figure 18 – SBS voltage pattern of bipolarly distorted positive unipolar impulse
Figure 19 – SBS voltage increase of bipolar impulses
23 Figure 20 – Representative scheme of conditioningprocedure before RPDIV measurement
Tables
Table 1 – Typical ranges of impulse voltage parameters at terminal of test object to be reported
24 4.5 Impulse voltage distribution inside rotating machines
25 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 – 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]
26 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
27 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
28 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
29 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
30 6 Impulse PD test procedure
6.1 Test object
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)
31 6.1.2 Motorette or formette
6.1.3 Complete winding and connection
32 Figure 31 – Representative scheme of voltage terminalsfor three-terminal machine and four-terminal machine
Table 2 – Connection of complete winding of three-terminal machine
33 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 – Connection of complete winding of four-terminal machine
34 6.3 Test procedure and reports
35 Annex A (informative)Typical PD measurements on a complete winding
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
37 Annex B (informative)Example of PD data analysis using phase angle
Figure B.1 – Example of PD phase angle pattern of sinusoidal voltage
38 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)
39 Annex C (informative)Example of connection of complete windings
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)
40 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)
41 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)
42 C.3 Connections for four-terminal machines
Figure C.9 – Four-terminal machine with earthed N terminal – Connection types (Table 3)
43 Annex D (informative)Example of SBS voltage increase pattern of repetitive impulse
Figure D.1 – SBS voltage increase of alternating train of unipolar impulses
44 Bibliography

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BSI PD IEC TS 60034-27-5:2021
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