IEC 60034-18-42:2017 defines criteria for assessing the insulation system of stator\/rotor windings of single or polyphase AC machines which are subjected to repetitive impulse voltages, such as those generated by pulse width modulation (PWM) converters, and are expected to experience and withstand partial discharge activity during service. It specifies electrical qualification tests on representative specimens to verify fitness for operation with voltage-source converters. It also describes an additional classification system which defines the limits of reliable performance under converter-fed conditions.<\/p>\n
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| 2<\/td>\n | National foreword <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 4 Machine terminal voltages arising from converter operation Figures Figure 1 \u2013 Voltage impulse waveshape parameters <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Figure 2 \u2013 Waveform representing one complete cycle of the phase to phase voltage at the terminals of a machine fed from a 3-level converter Tables Table 1 \u2013 Examples of the values of characteristics of the terminal voltages for two converter-fed machines <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Figure 3 \u2013 Jump voltage (Uj) at the terminals of a machine fed from a converter drive <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 5 Electrical stresses in the insulation system of machine windings 5.1 General Figure 4 \u2013 Maximum voltage enhancement at the machine terminals at infinite impedance as a function of cable length for various impulse rise times <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 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 5.4.2 Random-wound windings Figure 5 \u2013 Example of a random-wound design Figure 6 \u2013 Example of a form-wound design <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 5.4.3 Form-wound windings 6 Voltage rating for Type II insulation systems Figure 7 \u2013 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 <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 7 Stress factors for converter-fed Type II insulation systems Table 2 \u2013 Influence of features of the converter drive voltage on acceleration of ageing of components of Type II insulation systems <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 8 Qualification tests 8.1 General 8.2 Qualification tests <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 9 Qualification of mainwall insulation system 9.1 General 9.2 Test methods <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 9.3 Use of 50 Hz or 60 Hz life data to predict the service life with a converter drive <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 10 Qualification of turn insulation 10.1 General Figure 8 \u2013 Example of a life curve for a Type II mainwall insulation system <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 10.2 Test methods <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 11 Qualification of the stress control system 11.1 General Figure 9 \u2013 Example of a life curve for turn insulation <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | 11.2 Test methods <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | 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 13.2 Mainwall insulation <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | 13.3 Turn to turn insulation 13.4 Stress control system <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | 14 Qualification test pass criteria 14.1 Mainwall insulation 14.2 Turn to turn insulation 14.3 Stress control system 15 Routine test <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | 16 Optional screening tests 17 Analysis, reporting and classification <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | 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 \u2013 Representation of the phase to ground voltage at the terminals of a machine fed from a 3-level converter <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | A.3 Calculation to derive an equivalent voltage amplitude and frequency Table A.1 \u2013 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) <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Figure A.2 \u2013 Ratio of the life time consumption (y-axis) of impulse voltage (Upk\/pk) to fundamental voltage (U\u2019pk\/pk) expressed as a percentage for various impulse\/fundamental frequency ratios (n=10) <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | 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 \u2013 Example of a simple converter voltage simulation circuit <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | B.3 Alternative impulse test circuit using a semiconducting switch Figure B.2 \u2013 Typical waveform generated from the impulse generator <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | Figure B.3 \u2013 Example of a simple converter voltage simulation circuit Figure B.4 \u2013 Typical waveform generated from the impulse generator <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | Annex C (informative) Derivation of the short term endurance test voltage <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Annex D (informative) Derivation of the impulse voltage insulation class for the machine insulation Table D.1 \u2013 Phase to ground test voltages according to IVIC for Type II insulation systems <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | Table D.2 \u2013 Impulse voltage insulation classes (IVIC) <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | Annex E (normative) Derivation of an IVIC in the absence of a manufacturer\u2019s reference life line E.1 Derivation of an IVIC from endurance tests E.1.1 Mainwall insulation Figure E.1 \u2013 Reference life line for mainwall insulation <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | Annex F (informative) Optional screening tests F.1 General F.2 Short term endurance test on the mainwall insulation F.3 Voltage withstand test <\/td>\n<\/tr>\n | ||||||
| 48<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Rotating electrical machines – Partial discharge resistant electrical insulation systems (Type II) used in rotating electrical machines fed from voltage converters – Qualification tests<\/b><\/p>\n |