SIST EN 61857-31:2017

Electrical insulation systems-procedures for thermal evaluation - Part 31: Applications with a designed life less than 5000 hours (IEC 61857-31:2017)

IEC 61857-31:2017(E) establishes an EIS evaluation for applications with a designed life of 5 000 h or less. This test method follows the procedures of IEC 60505 and is modified based on the range of designed life.

Elektrische Isoliersysteme - Verfahren zur thermischen Bewertung - Teil 31: Anwendungen mit einer vorgesehenen Betriebsdauer von weniger als 5 000 h oder weniger

Systèmes d'isolation électrique - Procédures d'évaluation thermique – Partie 31: Applications avec une durée de vie de conception maximale de 5 000h

   L'IEC 61857-31:2017 établit une évaluation SIE pour les applications dont la durée de vie de conception maximale est de 5 000 h. Cette méthode d'essai suit les procédures de l'IEC 60505 et est modifiée en fonction de la plage de durée de vie de conception.

Električni izolacijski sistemi - Postopki za ocenjevanje toplotnih lastnosti - 31. del: Vrste uporabe s predvideno življenjsko dobo, krajšo od 5000 ur (IEC 61857-31:2017)

Ta del standarda IEC 61857 vzpostavlja ocenjevanje električnih izolacijskih sistemov za vrste uporabe s predvideno življenjsko dob 5000 ur ali manj. Ta preskusna metoda upošteva postopke iz standarda IEC 60505 in je prilagojena na podlagi predvidene življenjske dobe.

General Information

• Status: Published
• Publication Date: 25-Apr-2017
• ICS: 29.080.30 - Insulation systems
• Technical Committee: IIZS - Insulating materials and systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 19-Apr-2017
• Due Date: 24-Jun-2017
• Completion Date: 26-Apr-2017
• Ref Project: EN 61857-31:2017 - Electrical insulation systems - Procedures for thermal evaluation - Part 31: Applications with a designed life of 5 000 h or less

Overview

EN 61857-31:2017 (IEC 61857-31:2017) defines procedures for the thermal evaluation of electrical insulation systems (EIS) for applications with a designed life of 5 000 hours or less. It adapts the general EIS evaluation framework of IEC 60505 and IEC 61857 series to shorter-life applications (for example, many automotive and short-service electronic components), providing controlled thermal ageing, conditioning and diagnostic-testing sequences to establish a thermal endurance (TE) rating or screening result.

Key topics and requirements

• Scope and purpose: Establishes EIS evaluation methods tailored to designed lives ≤ 5 000 h; intended as full or screening thermal tests that can be expanded into full evaluations.
• Three test procedures:
  • Procedure A - one-temperature ageing for designed life ≤ 1 500 h. Ageing temperature = 10 K above maximum design temperature; average life of the set must be ≥ 1 500 h. Typical ageing subcycle example: 168 h per cycle to accumulate required hours.
  • Procedure B - one-temperature ageing for designed life up to 5 000 h. Follows the same 10 K above design temperature principle; Procedure A ageing time can be extended up to 5 000 h to meet this procedure.
  • Procedure C - two-temperature ageing for designed life up to 5 000 h: two sets of test objects aged at 20–30 K and 30–35 K above maximum design temperature to assess behavior across higher stress levels.
• Test cycle components: Each test cycle includes a thermal ageing subcycle (per IEC 60505), a conditioning subcycle (per IEC TR 61857-2 and applicable parts such as IEC 61857-21/22), and diagnostic testing as specified by the selected method.
• Data analysis & reporting: The standard defines analysis routes for single- and two-temperature procedures and requires a formal test report. Results may be used to derive TE ratings or as a screening segment of a larger evaluation.
• Expandable tests: Screening tests under EN 61857-31 can be continued (if started before completion) to form full thermal evaluations per the IEC 61857 series.

Applications

• Short-life or limited-service electrical insulation applications such as automotive components, temporary-use power electronics, and other devices where the designed operational life is ≤ 5 000 h.
• Use cases: material selection, qualification of EIS formulations, supplier acceptance testing, and screening of production batches for thermal durability.

Who should use this standard

• EIS manufacturers and formulators
• Automotive and electronics OEMs and tier suppliers
• Independent testing and certification laboratories
• R&D, quality assurance and reliability engineers working on insulation lifetime assessment

Related standards

• IEC 60505 - Evaluation and qualification of electrical insulation systems
• IEC 61857-1 - General requirements for thermal evaluation (low-voltage)
• IEC TR 61857-2 - Guidance on selecting appropriate EIS test methods
• IEC 61857-21 / IEC 61857-22 - Specific conditioning and model requirements

Keywords: EN 61857-31:2017, electrical insulation systems, thermal evaluation, thermal endurance, EIS, designed life 5000 h, IEC 60505, insulation ageing, TE rating, screening test.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2017
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Electrical insulation systems-procedures for thermal evaluation - Part 31: Applications
with a designed life less than 5000 hours (IEC 61857-31:2017)
Ta slovenski standard je istoveten z: EN 61857-31:2017
ICS:
29.080.30 Izolacijski sistemi Insulation systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 61857-31

NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2017
ICS 29.080.30
English Version
Electrical insulation systems - Procedures for thermal evaluation
- Part 31: Applications with a designed life of 5 000 h or less
(IEC 61857-31:2017)
Systèmes d'isolement électrique - Modes opératoires pour Elektrische Isoliersysteme - Verfahren zur thermischen
l'évaluation thermique - Partie 31 : Applications à durée de Bewertung - Teil 31: Anwendungen mit einer vorgesehenen
vie nominale inférieure à 5 000 heures Betriebsdauer von weniger als 5 000 h
(IEC 61857-31:2017) (IEC 61857-31:2017)
This European Standard was approved by CENELEC on 2017-02-28. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61857-31:2017 E
European foreword
The text of document 112/356/CDV, future edition 1 of IEC 61857-31, prepared by
IEC/TC 112 "Evaluation and qualification of electrical insulating materials and systems" was submitted
to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61857-31:2017.

The following dates are fixed:
(dop) 2017-11-28
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2020-02-28
standards conflicting with the
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 61857-31:2017 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 61857 (series) NOTE Harmonized as EN 61857 (series).

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60505 -  Evaluation and qualification of electrical EN 60505 -
insulation systems
IEC 61857-1 -  Electrical insulation systems - Procedures EN 61857-1 -
for thermal evaluation -- Part 1: General
requirements - Low-voltage
IEC 61857-21 -  Electrical insulation systems - Procedures EN 61857-21 -
for thermal evaluation -- Part 21: Specific
requirements for general-purpose models -
Wire-wound applications
IEC 61857-22 -  Electrical insulation systems - Procedures EN 61857-22 -
for thermal evaluation -- Part 22: Specific
requirements for encapsulated-coil model -
Wire-wound electrical insulation system
(EIS)
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 61857-31 ®
Edition 1.0 2017-01
INTERNATIONAL
STANDARD
Electrical insulation systems – Procedures for thermal evaluation –

Part 31: Applications with a designed life of 5 000 h or less

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.080.30 ISBN 978-2-8322-3843-1

– 2 – IEC 61857-31:2017  IEC 2017
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 EIS evaluation . 7
5 Test objects . 7
6 Test procedures . 7
6.1 Procedure A: Establishing a TE for applications with a designed life of
1 500 h or less: one-temperature ageing . 7
6.2 Procedure B: Establishing a TE rating for applications with a designed life of
5 000 h or less: one-temperature ageing . 8
6.3 Procedure C: Establishing a TE rating for applications with a designed life of
5 000 h or less: two-temperature ageing . 8
7 Data analysis . 8
7.1 Analysis – Test Procedures A and B (See 6.1 and 6.2) . 8
7.2 Analysis – Test Procedure C (See 6.3) . 9
8 Test report . 9
Bibliography . 10

IEC 61857-31:2017  IEC 2017 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSULATION SYSTEMS – PROCEDURES
FOR THERMAL EVALUATION –
Part 31: Applications with a designed life of 5 000 h or less

FOREWORD
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