BS EN 60034-18-42:2017+A1:2020
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Rotating electrical machines – Partial discharge resistant electrical insulation systems (Type II) used in rotating electrical machines fed from voltage converters. Qualification tests
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 52 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 4 | European foreword Endorsement notice |
| 5 | Blank Page |
| 7 | English CONTENTS |
| 12 | INTRODUCTION |
| 13 | 1 Scope 2 Normative references |
| 14 | 3 Terms and definitions |
| 17 | 4 Machine terminal voltages arising from converter operation |
| 18 | Figures Figure 1 – Voltage impulse waveshape parameters Tables Table 1 – Examples of the measured values of characteristics of the terminal voltages for two converter-fed machines |
| 19 | Figure 2 – Waveform representing one complete cycle of the phase to phase voltage at the terminals of a machine fed from a 3-level converter Figure 3 – Jump voltage (Uj or Uj max) at the terminals of a machine fed from a converter drive |
| 20 | 5 Electrical stresses in the insulation system of machine windings 5.1 General Figure 4 – Maximum voltage enhancement at the machine terminals at infinite impedance as a function of cable length for various impulse rise times |
| 21 | 5.2 Voltages stressing the phase to phase insulation 5.3 Voltages stressing the phase to ground insulation 5.4 Voltages stressing the turn to turn insulation 5.4.1 General Figure 5 – Example of a random-wound design Figure 6 – Example of a form-wound design |
| 22 | 5.4.2 Random-wound windings 5.4.3 Form-wound windings 6 Voltage rating for Type II insulation systems Figure 7 – Worst case voltage stressing the turn to turn insulation in a variety of random-wound stators as a function of the rise time of the impulse |
| 23 | 7 Stress factors for converter-fed Type II insulation systems |
| 24 | Table 2 – Influence of features of the converter drive voltage on acceleration of ageing of components of Type II insulation systems |
| 25 | 8 Qualification tests 8.1 General 8.2 Qualification tests |
| 26 | 9 Qualification of mainwall insulation system 9.1 General 9.2 Test methods |
| 27 | 9.3 Use of 50 Hz or 60 Hz life data to predict the service life with a converter drive |
| 28 | 10 Qualification of turn insulation 10.1 General Figure 8 – Example of a life curve for a Type II mainwall insulation system |
| 29 | 10.2 Test methods |
| 30 | 11 Qualification of the stress control system 11.1 General Figure 9 – Example of a life curve for turn insulation |
| 31 | 11.2 Test methods |
| 32 | 12 Preparation of test objects 12.1 General 12.2 Mainwall specimens 12.3 Turn to turn specimens 12.4 Stress control specimens 13 Qualification test procedures 13.1 General |
| 33 | 13.2 Mainwall insulation 13.3 Turn to turn insulation 13.4 Stress control system |
| 34 | 14 Qualification test pass criteria 14.1 Mainwall insulation 14.2 Turn to turn insulation 14.3 Stress control system |
| 35 | 15 Routine test 16 Optional screening tests 17 Analysis, reporting and classification |
| 36 | Annexes Annex A (informative) Contributions to ageing of the mainwall insulation A.1 Life time consumption of the mainwall insulation A.2 Calculation of the contributions to ageing from a 3-level converter drive Figure A.1 – Representation of the phase to ground voltage at the terminals of a machine fed from a 3-level converter |
| 37 | A.3 Calculation to derive an equivalent voltage amplitude and frequency Table A.1 – Contribution to electrical ageing by 1 kHz impulses from a 3-level converter as a percentage of the ageing from the 50 Hz fundamental voltage (endurance coefficient of 10) |
| 38 | Figure A.2 – Ratio of the life time consumption (y-axis) of impulse voltage (Upk/pk) to fundamental voltage (U’pk/pk) expressed as a percentage for various impulse/fundamental frequency ratios (n=10) |
| 39 | Annex B (informative) Examples of circuits for impulse testing B.1 Impulse test circuit using a semiconducting switch B.2 Typical waveform generated from the impulse generator Figure B.1 – Example of a simple converter voltage simulation circuit |
| 40 | B.3 Alternative impulse test circuit using a semiconducting switch Figure B.2 – Typical waveform generated from the impulse generator |
| 41 | Figure B.3 – Example of a simple converter voltage simulation circuit Figure B.4 – Typical waveform generated from the impulse generator |
| 42 | Annex C (informative) Derivation of the short term endurance test voltage |
| 43 | Annex D (informative) Derivation of the impulse voltage insulation classfor the machine insulation |
| 44 | Table D.1 – IVIC- and test voltage factor definition for Type II insulation systems |
| 45 | Table D.2 – Impulse voltage insulation classes (IVIC) |
| 46 | Annex E (normative) Derivation of an IVIC in the absence of a manufacturer’s reference life line E.1 Derivation of an IVIC from endurance tests E.1.1 Mainwall insulation Figure E.1 – Reference life line for mainwall insulation |
| 47 | E.1.2 Turn insulation E.1.3 Stress control system E.2 Derivation of the IVIC X on the basis of satisfactory service experience E.3 Derivation of an IVIC S on the basis of satisfactory service experience |
| 48 | Annex F (informative) Optional screening tests F.1 General F.2 Short term endurance test on the mainwall insulation |
| 49 | Bibliography |
