prEN IEC 61857-33:2023
(Main)Electrical insulation systems - Procedures for thermal evaluation - Part 33: Multifactor evaluation with increased ageing factors at elevated temperature
Electrical insulation systems - Procedures for thermal evaluation - Part 33: Multifactor evaluation with increased ageing factors at elevated temperature
Elektrische Isoliersysteme - Verfahren zur thermischen Bewertung - Teil 33: Multifaktor-Bewertung mit erhöhten Alterungsfaktoren bei erhöhter Temperatur
Sistemi električne izolacije - Postopki za toplotno vrednotenje - 33. del: Ocenjevanje po več faktorjih s povečanimi dejavniki staranja pri povišani temperaturi
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2023
Sistemi električne izolacije - Postopki za toplotno vrednotenje - 33. del:
Ocenjevanje po več faktorjih s povečanimi dejavniki staranja pri povišani
temperaturi
Electrical insulation systems - Procedures for thermal evaluation - Part 33: Multifactor
evaluation with increased ageing factors at elevated temperature
Ta slovenski standard je istoveten z: prEN IEC 61857-33:2023
ICS:
29.080.30 Izolacijski sistemi Insulation systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
112/605/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61857-33 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2023-05-05 2023-07-28
SUPERSEDES DOCUMENTS:
112/573/CD, 112/600/CC
IEC TC 112 : EVALUATION AND QUALIFICATION OF ELECTRICAL INSULATING MATERIALS AND SYSTEMS
SECRETARIAT: SECRETARY:
Germany Mr Bernd Komanschek
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
TC 2,TC 14,TC 15,TC 23,TC 42,TC 55,TC 96
Other TC/SCs are requested to indicate their interest, if any,
in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
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TITLE:
Electrical insulation systems - Procedures for thermal evaluation - Part 33: Multifactor evaluation with
increased ageing factors at elevated temperature
PROPOSED STABILITY DATE: 2027
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.
IEC CDV 61857-33 © IEC 2023 2 112/605/CDV
1 CONTENTS
3 FOREWORD . 4
4 INTRODUCTION . 6
5 1 Scope . 7
6 2 Normative references . 7
7 3 Terms and definitions . 7
8 4 Procedure . 8
9 5 Test objects . 9
10 6 EIS evaluation . 9
11 6.1 Selection of the appropriate EIS test method . 9
12 6.2 Comparison of the reference and candidate EIS . 10
13 6.3 Evaluation of the additional stresses E, A and/or M in combination with T . 10
14 6.4 Variation . 10
15 7 Illustration of the structure – Thermal evaluation – Step 1 . 10
16 7.1 Establishing the baseline thermal classification. 10
17 7.2 Illustration of the thermal evaluation . 11
18 8 Evaluation of the influence of multifactor stresses – Step 2 . 12
19 8.1 General . 12
20 8.2 Selection of the ageing temperature for the one-temperature comparison . 12
21 8.3 Selection of the ageing temperatures for the two-temperature comparison . 13
22 8.4 Diagnostic tests and end-point criterion applied at elevated temperature . 13
23 8.5 Diagnostics . 13
24 8.6 Using ageing cycles . 13
25 8.7 Diagnostics applied at elevated temperature without ageing cycles. 14
26 8.8 Examples of different ambient/environmental stress during operation . 14
27 8.9 Examples of mechanical stress during operation . 14
28 9 Analysis of data . 15
29 9.1 General . 15
30 9.2 Evaluation of the other stresses of influence . 16
31 9.3 Use of the 5-degree uncertainty criterion . 16
32 The procedure for analysis of the comparison of results between the baseline EIS evaluated
33 with thermal stress as the only dominant stress is compared and the performance
34 when one or more of the other stress factors are simultaneously applied is; . 16
35 9.4 Comparison of the result between the baseline EIS and any of the sets of results for
T
36 other factors of influence . 16
37 10 Report. 16
38 Annex A (informative) Example of a test data sheet report . 18
39 Annex B (informative) Example of a thermal endurance graph – Reference EIS . 19
40 Annex C (informative) Example of a test data sheet for a baseline thermal classification when
41 the reference thermal index value is known . 20
42 Annex D (informative) Establishing the thermal endurance of the baseline using the reference
43 correlation time . 21
44 Annex E (informative) Analysis of data using the 5-degree uncertainty criterion . 23
45 Annex F (informative) . 27
IEC CDV 61857-33 © IEC 2023 3 112/605/CDV
46 Annex G (informative) . 29
47 Annex H (informative) Calculations for the 5-degree uncertainty criterion . 36
48 Bibliography . 37
50 Figure 1 – Overview of the two-step evaluation procedure . 9
51 The thermal classification of the baseline is established when the thermal ageing of both the
52 reference EIS and the candidate EIS have completed as determined in clause 6.1. The
53 analysis of the candidate test results is compared to the reference EIS; refer to . 10
54 Figure 2 – Illustration of the establishment of the thermal classification of the baseline EIS . 11
55 Figure 3 – Comparison of the influence of any of the multifactor exposures with the baseline
56 performance . 12
57 Figure 4 – Comparison of the influence of a different electrical stress applied during thermal
58 exposure with the baseline thermal design . 14
59 Figure 5 – Comparison of the influence of a different ambient/environmental stress applied
60 during thermal exposure with the baseline thermal design . 14
61 Figure 6 – Comparison of the influence of a different mechanical stress applied during thermal
62 exposure with the baseline thermal design . 15
63 Figure B.1 – Time coordinate established at 48 400 h with a known temperature of 185 °C . 19
64 Figure D.1 – Temperature index at 160 °C with a correlation time of 48 400 h . 21
65 Figure E.1 – Plotting the data in Annex C showing confidence ranges . 25
67 Table 1 – Example of thermal test results for reference EIS based on data sheets given in
68 Annex A . 11
69 Table A.1 – Example of a test data sheet report . 18
70 Table C.1 – Example of a test data sheet for a baseline thermal classification when the
71 reference thermal index value is known . 20
72 Table E.1 – Example of test results . 24
73 Table E.2 – Limits of the range of ± 5-degrees . 24
74 Table E.3 – Examples of multifactor exposure . 25
IEC CDV 61857-33 © IEC 2023 4 112/605/CDV
79 INTERNATIONAL ELECTROTECHNICAL COMMISSION
80 ____________
82 ELECTRICAL INSULATION SYSTEMS –
83 PROCEDURES FOR THERMAL EVALUATION –
85 Part 33: Multifactor evaluation with increased ageing factors
86 at elevated temperature
88 FOREWORD
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