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BS EN 60034-18-42:2017

BS EN 60034-18-42:2017

$189.07

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 2017 50
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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.

PDF Catalog

PDF Pages PDF Title
2 National foreword
5 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
10 FOREWORD
12 INTRODUCTION
13 1 Scope
2 Normative references
14 3 Terms and definitions
17 4 Machine terminal voltages arising from converter operation
Figures
Figure 1 – Voltage impulse waveshape parameters
18 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
Tables
Table 1 – Examples of the values of characteristics of the terminal voltages for two converter-fed machines
19 Figure 3 – Jump voltage (Uj) 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
5.4.2 Random-wound windings
Figure 5 – Example of a random-wound design
Figure 6 – Example of a form-wound design
22 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
Table 2 – Influence of features of the converter drive voltage on acceleration of ageing of components of Type II insulation systems
24 8 Qualification tests
8.1 General
8.2 Qualification tests
25 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
13.2 Mainwall insulation
33 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
15 Routine test
35 16 Optional screening tests
17 Analysis, reporting and classification
36 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 class for the machine insulation
Table D.1 – Phase to ground test voltages according to IVIC for Type II insulation systems
44 Table D.2 – Impulse voltage insulation classes (IVIC)
45 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
46 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
47 Annex F (informative) Optional screening tests
F.1 General
F.2 Short term endurance test on the mainwall insulation
F.3 Voltage withstand test
48 Bibliography

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BS EN 60034-18-42:2017
$189.07