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
Current Stage
PPUB - Publication issued
Completion Date
14-Oct-2019
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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
IEC 61857-32:2019-10(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 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

---------------------- Page: 4 ----------------------
IEC 61857-32:2019 © IEC 2019 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSULATION SYSTEMS – PROCEDURES
FOR THERMAL EVALUATION –
Part 32: Multifactor evaluation with increased
factors during diagnostic testing
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61857-32 has been prepared by IEC technical committee 112:

Evaluation and qualification of electrical insulating materials and systems
The text of this International Standard is based on the following documents:
CDV Report on voting
112/399/CDV 112/425A/RVC

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

---------------------- Page: 5 ----------------------
– 4 – IEC 61857-32:2019 © IEC 2019

A list of all parts in the IEC 61857 series, published under the general title Electrical insulation

systems – Procedures for thermal evaluation, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 6 ----------------------
IEC 61857-32:2019 © IEC 2019 – 5 –
INTRODUCTION

Accelerated ageing of an Electrical Insulation System [EIS] is intended to evaluate the

thermal classification of the EIS. Many applications need to include the evaluation of other

factors in addition to the thermal factor related to the application.

IEC 60505 provides four categories of stresses or ageing factors which influence the

performance of products in use under a wide range of operating conditions. In IEC 60505, the

factors are presented as Thermal [T], Electrical [E], Environmental [E], and Mechanical [M]. In

this part of IEC 61857, Environmental [E] is replaced with Ambient [A] to remove possible

confusion of having two factors represented by the same letter. For this document, the factors

are presented with Thermal [T], Electrical [E], Ambient [A], and Mechanical [M].

This document provides the structure for evaluation of one or more of the three factors E, A

and M by direct comparison to the baseline classification established by T. Without the

baseline, any analysis is limited.

While similar, IEC 61857-32 and IEC 61857-33 have different structure and evaluation

conditions. In IEC 61857-32, thermal exposure is the only intended ageing factor and

additional stresses are only applied during the diagnostic portion of each test cycle. In

IEC 61857-33, the stresses are applied continually at elevated temperatures.
---------------------- Page: 7 ----------------------
– 6 – IEC 61857-32:2019 © IEC 2019
ELECTRICAL INSULATION SYSTEMS – PROCEDURES
FOR THERMAL EVALUATION –
Part 32: Multifactor evaluation with increased
factors during diagnostic testing
1 Scope

This part of the 61857 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.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.

IEC 61857-1, Electrical insulation systems – Procedures for thermal evaluation – Part 1:

General requirements – Low-voltage

IEC TR 61857-2, Electrical insulation systems – Procedures for thermal evaluation – Part 2:

Selection of the appropriate test method for evaluation and classification of electrical

insulation systems

IEC 61858-2, Electrical insulation systems – Thermal evaluation of modifications to an

established electrical insulation system (EIS) – Part 2: Form-wound EIS
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 61857-1 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org
---------------------- Page: 8 ----------------------
IEC 61857-32:2019 © IEC 2019 – 7 –
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
baseline candidate EIS
EIS exposed to the same thermal ageing and conditioning as the reference EIS
3.2
reference EIS

EIS of a known or field proven design used to establish the thermal classification of the

candidate EIS
3.3
EIS
established thermal classification of the reference EIS
3.4
EIS

assigned thermal classification of the candidate EIS based on the comparison to the reference

EIS
4 Procedure
An overview of the structure is shown in Figure 1.
Reference Baseline
Electrical [E]
candidate
EIS
EIS
Ambient [A]
Mechanical [M]
IEC
Figure 1 – Overview
5 Test objects

Test objects shall be in accordance with the test method selected from IEC TR 61857-2.

The design of test object(s) shall be in accordance with the test method selected. When part

of the evaluation is to compare processing or alternate designs of the same functioning

product, the modifications shall be part of the multifactor test object construction with all

modifications documented in the report.

The preferred number of test objects is contained in the individual test method selected from

IEC TR 61857-2.
6 EIS evaluation

The evaluation of the endurance of the candidate EIS and evaluation with multifactor stresses

is separated into two parts.
---------------------- Page: 9 ----------------------
– 8 – IEC 61857-32:2019 © IEC 2019

Part 1: evaluation of the baseline candidate EIS under standard exposure, conditioning, and

testing to establish the baseline performance.

Part 2: evaluation of the possible influence of other factors on the performance of the EIS by

conducting a one-temperature side-by-side comparison with one set of test objects

undergoing evaluation with standard exposure, conditioning, and testing and the second set of

test objects undergoing evaluation with the same thermal exposure but including the other

stress factor(s) during conditioning and/or testing.

The baseline candidate EIS and EIS undergoing evaluation with other/increased stresses are

expected to utilize the same materials and be of the same design and construction. The only

factor expected to be different between the two sets of test specimens/objects is the

diagnostic stress during the diagnostic portion of the evaluation, unless the purpose of the

test is to evaluate a manufacturing/process change.
7 Part 1: Baseline structure
7.1 General

Part 1 consists of the evaluation of a candidate system compared to a reference system or a

pre-selected correlation time in accordance with one of the test methods selected from

IEC TR 61857-2. The candidate and reference systems shall be evaluated in the same

manner. This is essential for analysis of the results. In addition, all sets of test objects shall

be of the same design and construction unless the purpose of the test is to evaluate design

changes. The thermal class of the reference and candidate systems may be different. There is

no requirement for the reference and candidate EIS to have the same thermal classification,

as the thermal classification of the candidate EIS cannot be known until completion of the

thermal ageing.

NOTE In a situation where no established reference EIS can be identified a preselected time coordinate is usable

as the means to establish the thermal classification of the baseline candidate EIS.

The candidate EIS is evaluated to establish the thermal endurance performance by direct

comparison to the selected reference EIS or pre-selected correlation time. The performance

of the candidate EIS when exposed to thermal stress and conditions in accordance with the

standard EIS test method(s) becomes the baseline needed to evaluate the influence of the

additional stresses.

In Part 1, the reference EIS and baseline candidate EIS may have different thermal classes,

which means that the thermal ageing temperatures used during the evaluation may be

different. Part 2, for the evaluation of the baseline candidate EIS and the EIS which has

increased/additional diagnostic factors, requires both EIS to be exposed to the same thermal

ageing temperature for the same duration (thermal ageing hours) each cycle.
7.2 Illustration of the structure – Thermal evaluation

The candidate EIS performance is compared to a reference EIS to establish the thermal

endurance of the candidate EIS as illustrated in Figure 2.
---------------------- Page: 10 ----------------------
IEC 61857-32:2019 © IEC 2019 – 9 –
Baseline
Reference
candidate
EIS
EIS
IEC
Key
EIS established thermal classification of the reference EIS

EIS assigned thermal classification of the candidate EIS based on comparison to the reference EIS

Figure 2 – Illustration of the establishment of the thermal classification
of the candidate EIS
7.3 Example of thermal evaluation of a candidate EIS

The thermal evaluation of a candidate EIS typically consists of the exposure of test objects to

a minimum of three thermal ageing temperatures (one set of test objects per temperature, per

EIS being evaluated). The thermal ageing temperatures, number of test objects, etc. are

indicated in the appropriate EIS test method selected from IEC TR 61857-2.
Temperature 1 = highest
Temperature 2 = middle
Temperature 3 = lowest

The total number of sets of test objects needed = 3 reference + 3 candidate = 6 sets.

Table 1 provides an example showing the comparison of the performance of a possible

reference EIS to the performance of a possible candidate EIS.

Annex A provides an example of test data for a reference EIS with an example of the plotting

of the reference EIS data in Annex B.

Annex C provides an example of test data for a candidate EIS with an example of the plotting

of the candidate EIS data in Annex D.
Table 1 – Example of a reference EIS and candidate EIS; performance
at temperature and thermal classification
Thermal ageing Reference life at temperature Candidate life at temperature
temperatures [hours] [hours]
Highest = 240 °C H = 350 H = 480
R Y
Middle = 220 °C M = 1 600 M = 1 900
R Y
Lowest = 200 °C L = 5 700 L = 6 900
R Y
Thermal rating Thermal index = 180 °C Relative thermal index = 181 °C
Correlation time based on known thermal RTI based on comparison to the reference
index = 29 239 h system correlation time
---------------------- Page: 11 ----------------------
– 10 – IEC 61857-32:2019 © IEC 2019
8 Part 2: Evaluation of other factors
8.1 General

Part 2 includes the one-temperature comparison of a baseline EIS to a multi-factor EIS.

The multi-factor evaluation requires one set of test objects for the baseline EIS and a set of

test objects for each additional stress or change in diagnostic level to be evaluated (one set

per factor/evaluation). Prior to the start of the program, each potential factor should be

identified for potential inclusion into the total test program.

Once the thermal classification of the baseline candidate EIS has been established, the

assigned rating of the EIS does not change under the multifactor evaluation. The multifactor

evaluation is used to determine the potential impact of other factors on the performance of the

established EIS, which can be of value in end product design, manufacturing, or for potential

use of the EIS in specific applications.
8.2 Selection of the ageing temperature for the one-temperature comparison

The temperature selected shall reflect the expected operating temperature. When the

expected operating temperature is not known, the middle ageing temperature used to

evaluate the candidate EIS during comparison to a reference EIS shall be used. The preferred

temperature selected is one which resulted in a life in the range of 1 000 h to 1 500 h during

the baseline candidate evaluation. Table 2 provides an example of ageing temperature

selection for the one-temperature comparison.
Table 2 – Example of ageing temperature selection for
the one-temperature comparison
Thermal ageing Baseline candidate life at One-temperature comparison – Selected
temperatures temperature thermal ageing temperature
[hours]
Highest = 240 °C H = 480 230 °C
Middle = 220 °C M = 1 900 Based on the known life at temperature and
using the 10 °rule, thermal ageing at 230 °C
Lowest = 200 °C L = 6 900
should result in a life of approximately 900 h to
1 000 h

All evaluations for the influence of additional factors are made by comparison of the thermal

performance of the multifactor candidate EIS to the thermal performance of the baseline

candidate EIS as the thermal factor is common to all combinations. Comparisons shall

establish the influence of the additional factors on the EIS. Comparison is not made to the

reference EIS , which was used to establish the thermal rating and performance of the

baseline candidate EIS .

The thermal exposure at elevated temperature is separated into ageing cycles. The thermal

exposure and ageing cycles shall be the same for the baseline candidate and multifactor

candidate.

If agreed upon, evaluation of the multifactor candidate compared to the baseline candidate

and comparison of the baseline candidate to the reference may be conducted concurrently.

---------------------- Page: 12 ----------------------
IEC 61857-32:2019 © IEC 2019 – 11 –
8.3 Application of increased or additional diagnostic factors

Following each ageing cycle, the set of test objects for the baseline candidate EIS are

conditioned and tested in accordance with the appropriate test method selected from

IEC TR 61857-2.
Following each ageing cycle, the set of test objects for the mu
...

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