IEC 61857-32:2019

Electrical insulation systems - Procedures for thermal evaluation - Part 32: Multifactor evaluation with increased factors during diagnostic testing

IEC 61857-32:2019 series is focused on applications where other possible factors need to be incorporated to evaluate any influence on the performance of the electrical insulation system (EIS). Multi-factor evaluation is the most complex type of project to design and conduct. Clear guidelines are needed to give the user of this document a uniform approach and a method to analyse the test results.
This document is for applications where the stresses are some combination of other factors of influence identified in IEC 60505. The multi-factor stresses are applied during the diagnostic portion of each test cycle.
A few examples of other factors of influence or multi-factor stresses are:
– high vibration;
– submersion in oils, water, or solutions;
– voltage higher than the test voltage of the reference EIS;
– decreased cold shock temperature.

Systèmes d'isolation électrique - Procédures d'évaluation thermique - Partie 32: Évaluation multifactorielle avec facteurs augmentés pendant les essais de diagnostic

L'IEC 61857-32:2019 concerne essentiellement les applications dans lesquelles il est nécessaire d'intégrer d'autres facteurs possibles pour évaluer l'impact sur les performances du système d'isolation électrique (SIE). L'évaluation multifactorielle est le type de projet le plus complexe à concevoir et réaliser. Des lignes directrices claires sont nécessaires pour proposer à l'utilisateur du présent document une approche uniforme et une méthode d'analyse des résultats d'essai.
Le présent document concerne les applications dans lesquelles les contraintes combinent d'autres facteurs d'influence identifiés dans l'IEC 60505. Les contraintes multifactorielles sont appliquées pendant la partie de chaque cycle d'essai relative au diagnostic.
Quelques exemples d'autres facteurs d'influence ou de contraintes multifactorielles sont:
– les fortes vibrations;
– l'immersion dans l'huile, l'eau ou des solutions;
– une tension supérieure à la tension d'essai du SIE de référence;
– une température de choc au froid diminuée.

General Information

• Status: Published
• Publication Date: 13-Oct-2019
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.080.30 - Insulation systems
• Technical Committee: TC 112 - Evaluation and qualification of electrical insulating materials and systems
• Drafting Committee: WG 6 - TC 112/WG 6
• Current Stage: PPUB - Publication issued
• Start Date: 01-Nov-2019
• Completion Date: 14-Oct-2019

Standards Content (Sample)

IEC 61857-32 ®
Edition 1.0 2019-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electrical insulation systems – Procedures for thermal evaluation –
Part 32: Multifactor evaluation with increased factors during diagnostic testing

Systèmes d'isolation électrique – Procédures d'évaluation thermique –
Partie 32: Évaluation multifactorielle avec facteurs augmentés pendant
les essais de diagnostic
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IEC 61857-32 ®
Edition 1.0 2019-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electrical insulation systems – Procedures for thermal evaluation –

Part 32: Multifactor evaluation with increased factors during diagnostic testing

Systèmes d'isolation électrique – Procédures d'évaluation thermique –

Partie 32: Évaluation multifactorielle avec facteurs augmentés pendant

les essais de diagnostic
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.080.30 ISBN 978-2-8322-7463-7

– 2 – IEC 61857-32:2019 © IEC 2019
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Procedure . 7
5 Test objects . 7
6 EIS evaluation . 7
7 Part 1: Baseline structure . 8
7.1 General . 8
7.2 Illustration of the structure – Thermal evaluation . 8
7.3 Example of thermal evaluation of a candidate EIS . 9
8 Part 2: Evaluation of other factors . 10
8.1 General . 10
8.2 Selection of the ageing temperature for the one-temperature comparison . 10
8.3 Application of increased or additional diagnostic factors . 11
9 Analysis of data . 11
9.1 General . 11
9.2 Evaluation of the other factors of influence . 11
9.3 Comparison of the results is between the baseline EIS and any of the sets of
results for other factors of influence . 11
10 Report . 12
Bibliography . 13
Annex A (informative)  Example of a test data sheet report . 14
Annex B (informative) Example of thermal ageing data for the reference EIS –
Establishing the correlation time . 15
Annex C (informative) Example of a test data sheet for a baseline candidate thermal
classification . 16
Annex D (informative) Establishing the thermal endurance of the baseline candidate
using the reference correlation time . 17

Figure 1 – Overview . 7
Figure 2 – Illustration of the establishment of the thermal classification of
the candidate EIS . 9
Figure B.1 – Reference data with the known temperature of 186 °C, time coordinate
established at 45 200 h . 15
Figure D.1 – Baseline candidate data with the known thermal index of 161 °C when the
time coordinate from the reference is 45 200 hours . 17

Table 1 – Example of a reference EIS and candidate EIS; performance at temperature
and thermal classification. 9
Table 2 – Example of ageing temperature selection for the one-temperature
comparison . 10
Table A.1 – Example of a test data sheet . 14
Table C.1 – Example of a test data sheet for a baseline candidate . 16

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSULATION SYSTEMS – PROCEDURES
FOR THERMAL EVALUATION –
Part 32: Multifactor evaluation with increased
factors during diagnostic testing

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