BS EN IEC 60034-27-1:2018 – TC:2020 Edition
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Tracked Changes. Rotating electrical machines – Off-line partial discharge measurements on the winding insulation
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 152 |
IEC 60034-27-1:2017 provides a common basis for: – measuring techniques and instruments; – the arrangement of test circuits; – normalization and testing procedures; – noise reduction; – the documentation of test results; – the interpretation of test results, with respect to partial discharge off-line measurements on the winding insulation of rotating electrical machines. This International Standard cancels and replaces IEC TS 60034-27 (2006). It constitutes a technical revision and reflects numerous improvements and corrections with respect to the previous publication.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 84 | undefined |
| 89 | English CONTENTS |
| 92 | FOREWORD |
| 94 | INTRODUCTION |
| 96 | 1 Scope 2 Normative references |
| 97 | 3 Terms and definitions |
| 99 | 4 Nature of PD in rotating machines 4.1 Basics of PD |
| 100 | 4.2 Types of PD in rotating machines 4.2.1 General 4.2.2 Internal discharges 4.2.3 Slot discharges |
| 101 | 4.2.4 End-winding gap and surface discharges 4.2.5 Foreign conductive materials discharges 4.3 Pulse propagation in windings |
| 102 | 5 Measuring technologies and instrumentation 5.1 General 5.2 Influence of frequency response of measuring system |
| 103 | 5.3 Effects of PD coupling units Figures Figure 1 – Frequency response of a PD pulse and coupling unitsof various time constants |
| 104 | 5.4 Effect of the measuring instrument 6 Visualization of measurements 6.1 General 6.2 Minimum scope of PD data presentation |
| 105 | 6.3 Additional means of PD data representation 6.3.1 General Figure 2 – PD magnitude as a function of the normalizedtest voltage Q=f(U/Umax) |
| 106 | 6.3.2 Partial discharge pattern 7 Test circuits 7.1 General Figure 3 – Example of a PRPD pattern |
| 107 | 7.2 Individual winding components |
| 108 | 7.3 Complete windings 7.3.1 General Figure 4 – Basic test circuits in accordance with IEC 60270 |
| 109 | 7.3.2 Standard measurements (SX.X) Figure 5 – Test circuit for PD measurement (S1.1)on complete windings Tables Table 1 – Connection configuration S1 for open star point |
| 110 | 7.3.3 Optional, extended measurements (EX.X) Table 2 – Connection configuration S2 for closed star point Table 3 – Connection configuration E1 for open star point |
| 111 | 7.3.4 Using integrated test equipment (IX.X) Table 4 – Connection configuration E2 for closed star point Table 5 – Connection configuration I1 for integrated equipment and open star point, measurement on high voltage side |
| 112 | 8 Normalization of measurements 8.1 General Table 6 – Connection configuration I2 for integrated equipment and open star point, measurement on star point side Table 7 – Connection configuration I3 for integrated equipment and closed star point |
| 113 | 8.2 Individual winding components 8.3 Complete windings |
| 114 | Figure 6 – Normalization of the test circuit for measurement S1.1 |
| 115 | 9 Test procedures 9.1 Acquiring PD measurements on windings and winding components 9.1.1 General 9.1.2 Test equipment and safety requirements 9.1.3 Preparation of test objects |
| 116 | 9.1.4 Conditioning 9.1.5 Test voltages |
| 117 | 9.1.6 PD test procedure Figure 7 – Test voltage applied to the test object during PD measurement |
| 119 | 9.2 Identifying and locating the source of partial discharges 10 Interpretation of test results 10.1 General |
| 120 | 10.2 Interpretation of PD magnitude, inception and extinction voltage 10.2.1 Basic interpretation |
| 121 | 10.2.2 Trend in PD in a machine over time 10.2.3 Comparisons between winding components or between windings |
| 122 | 10.3 PD pattern recognition 10.3.1 General 10.3.2 Basic interpretation |
| 123 | Figure 8 – Example for identification and localization of PD sources |
| 124 | 11 Test report |
| 126 | Annex A (informative)Influence parameters of test frequency to testing procedure Table A.1 – Recommended minimum measurement timeand maximum slew rates |
| 127 | Annex B (informative)Alternative methods to determine discharge magnitudes B.1 Qm, according to definition 3.14 Figure B.1 – Example for the indication of polarity effect |
| 128 | B.2 Cumulative repetitive PD magnitude Qr |
| 129 | Figure B.2 – Effect of A/D conversion accuracy and the calculation of Qr, Example |
| 130 | Annex C (informative)Other off-line methods for PD detectionand methods for localization |
| 131 | Annex D (informative)External noise, disturbance and sensitivity D.1 General D.2 Sensitivity |
| 132 | Figure D.1 – Recharging of the test objectby various current components |
| 133 | D.3 Noise and signal-to-noise ratio D.4 Disturbances |
| 134 | Annex E (informative)Methods of disturbance suppression E.1 Frequency range limiting E.2 Phase window masking E.3 Masking by noise signal triggering E.4 Noise signal detection by measuring the propagation time Figure E.1 – Without window masking Figure E.2 – With window masking |
| 135 | E.5 Two-channel signal difference method Figure E.3 – Pulse currents through the measuring circuit |
| 136 | E.6 Suppression of constant wave (CW) signals by digital filtering E.7 Noise and disturbance rejection using signal processing techniques |
| 137 | Figure E.4 – Example of noise rejection |
| 138 | Figure E.5 – Example of cross-talk rejection |
| 139 | Annex F (informative)Interpretation of PD magnitude dataand phase resolved PD patterns F.1 Instructions for interpretation of PRPD patterns F.1.1 Example of PRPD patterns |
| 140 | Figure F.1 – Example of PRPD patterns |
| 141 | F.1.2 Relative severity of different PD mechanisms Table F.1 – Severity associated with the main PD sources in rotating machines |
| 142 | F.1.3 Interpretation of the PD measurements from the line side and from the star point F.1.4 Inductive discharges / Vibration sparking |
| 144 | Annex G (informative)Test circuits for complete windings G.1 General G.2 Schemes and illustrations (see Figure G.1) |
| 148 | Figure G.1 – Illustrated diagrams for Ү- and Δ-connections, according to 7.3 |
| 149 | Annex H (informative)Wide-band and narrow-band measuring systems H.1 General Figure H.1 – Typical pulse responses of wide bandand narrow band PD systems |
| 150 | H.2 Wide band systems H.3 Narrow band systems |
| 151 | Bibliography |
