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BS EN 60034-18-41:2014

BS EN 60034-18-41:2014

$189.07

Rotating electrical machines – Partial discharge free electrical insulation systems (Type I) used in rotating electrical machines fed from voltage converters. Qualification and quality control tests

Published By Publication Date Number of Pages
BSI 2014 46
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IEC 60034-18-41:2014 defines criteria for assessing the insulation system of stator/rotor windings which are subjected to voltage-source pulse-width-modulation drives. It applies to stator/rotor windings of single or polyphase AC machines with insulation systems for converter operation. It describes qualification tests and quality control (type and routine) tests on representative samples or on completed machines which verify fitness for operation with voltage source converters.

PDF Catalog

PDF Pages PDF Title
4 Foreword
Endorsement notice
5 Annex ZA (normative) Normative references to international publications with their corresponding European publications
7 English
CONTENTS
10 INTRODUCTION
12 1 Scope
2 Normative references
13 3 Terms and definitions
16 4 Machine terminal voltages arising from converter operation
Figures
Figure 1 – Voltage impulse waveshape parameters
17 Tables
Table 1 – Common ranges of characteristics of the terminalvoltages of converter fed machines
Table 2 – Definition of symbols
18 Figure 2 – Five step phase to phase voltage at the terminalsof a machine fed by a 3-level converter
Figure 3 – Jump voltage (Uj) at the machine terminals associatedwith a converter drive
20 5 Electrical stresses in the insulation system of machine windings
5.1 General
Figure 4 – Voltage enhancement at the terminals of a motor due to reflectionas a function of cable length for various impulse rise times
21 5.2 Voltages stressing the phase/phase insulation
5.3 Voltages stressing the phase/ground insulation
5.4 Voltages stressing the turn and strand insulation
Figure 6 – Example of a form-wound design
Figure 5 – Example of a random wound design
22 5.5 Mechanisms of insulation degradation
Figure 7 – Worst case voltage stressing the turn/turn insulation in a varietyof random wound stators as a function of the rise time of the impulse
23 6 Types of machine insulation
7 Stress categories for Type I insulation systems used in converter fed machines
24 Table 3 – Influence of features of the machine terminal voltageon components of Type I insulation systems
Table 4 – Stress categories for Type I insulation systems based on a 2-level converter
25 8 Design qualification and type tests for Type I insulation systems
8.1 General
8.2 Design qualification test
8.3 Type test
9 Test equipment
9.1 PD measurement at power frequency
9.2 PD measurement during voltage impulses
26 9.3 Voltage impulse generators
9.4 Sensitivity
9.5 PD tests
9.5.1 Power frequency voltage
9.5.2 Impulse excitation
10 Qualification of the design of Type I insulation systems
10.1 General
27 10.2 Approach
10.2.1 General
10.2.2 Twisted pair or equivalent arrangement
10.2.3 Motorette (random wound) or formette (form-wound)
10.2.4 Complete windings
28 10.3 Preparation of test objects
10.3.1 General
10.3.2 Turn/turn insulation samples
10.3.3 Motorette/formette test samples or complete windings
Table 5 – Allowable voltage waveforms for testing system components
29 10.4 Design qualification tests
10.4.1 General
10.4.2 Pre-diagnostic tests
10.4.3 Diagnostic tests
10.4.4 Ageing cycle
10.4.5 PD tests
30 10.5 Pass criterion for the design qualification test
11 Type test procedure for Type I insulation systems
11.1 General
11.2 Power frequency PD tests
31 11.3 Impulse PD tests
12 Routine tests
13 Analysis, reporting and classification
32 Annex A (informative) Derivation of possible terminal voltages in service for a converter-fed machine
A.1 Calculation of d.c. bus voltage
Figure A.1 – Circuit diagram for a converter/machine system
33 A.2 Calculation of maximum peak voltages for a 2-level converter
34 Table A.1 – Examples of maximum peak voltages
35 Annex B (normative) Derivation of test voltages for Type I insulation systems
B.1 Stress categories
B.2 Requirements for the applied impulse voltage
Table B.1 – Summary of stress categories
36 B.3 Enhancement factors for PD tests
Figure B.1 – Forbidden zone (shaded) for impulse tests
Figure B.2 – Examples of test waveforms
37 B.4 Voltage for design qualification and type tests
Table B.2 – Summary of enhancement factors to be applied to the operating voltages
38 Figure B.3 – Comparison of phase/phase, phase/ground, and turn/turn voltagesfor a 2-level converter
39 Figure B.4 – Impulse test voltage waveforms and the levels for applying the same peak/peak voltage of 2aUj on the turn/turn insulation (schematic representation)
Table B.3 – Maximum peak/peak operating voltages related to Udc for a 2-level converter according to the stress categories of Table 4
40 B.5 Examples of maximum peak/peak operating voltages
B.6 Calculation of test voltages
Table B.4 – Examples of maximum peak/peak operating voltage for a 500 V r.m.s. rated winding fed from a 2-level converter, according to the stress categories of Table 4.
Table B.5 – Examples of maximum peak/peak test voltage for a 500 V rated winding fed from a 2-level converter, according to the stress categories of Table 4 and with EF 1,25
41 Figure B.5 – Test voltages for phase/ground and turn/turn impulsetests using a unipolar impulse
Table B.6 – Turn/turn PD test levels for special windings and twisted pairs
42 Annex C (normative) Derivation of allowable voltages in service
C.1 Impulse voltage insulation class (IVIC) of the machine
C.2 Impulse voltage insulation class assigned in special designs
Table C.1 – Maximum allowable operating voltageat the machine terminals in units of UN
44 Bibliography

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BS EN 60034-18-41:2014
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