Photovoltaic module - Bypass diode - Thermal runaway test

IEC 62979:2017(E) provides a method for evaluating whether a bypass diode as mounted in the module is susceptible to thermal runaway or if there is sufficient cooling for it to survive the transition from forward bias operation to reverse bias operation without overheating. This test methodology is particularly suited for testing of Schottky barrier diodes, which have the characteristic of increasing leakage current as a function of reverse bias voltage at high temperature, making them more susceptible to thermal runaway.

Photvoltaik (PV)-Module - Bypass-Diode - Prüfung des thermischen Durchgehens

Essai d'emballement thermique portant sur les diodes de dérivation des modules photovoltaïques

l'IEC 62979:2017 donne une méthode permettant de déterminer si la diode de dérivation montée dans le module est susceptible de faire l'objet d'un emballement thermique ou si le refroidissement est suffisant pour lui permettre de résister au passage entre un fonctionnement en polarisation directe et un fonctionnement en polarisation inverse sans surchauffe. Cette méthodologie d'essai est particulièrement adaptée pour les diodes Schottky, qui ont la particularité d'augmenter le courant de fuite en fonction de la tension de polarisation inverse à haute température, ce qui les rend plus propices à l'emballement thermique.

Fotonapetostni modul - Obvodna dioda - Preskus termičnega pobega

Ta dokument določa metodo za ocenjevanje, ali je obvodna dioda, kot je vgrajena v modulu, dovzetna za termični pobeg, ali je na voljo dovolj hlajenja, da brez pregrevanja zdrži prehod iz delovanja z napetostjo v prevodni smeri v delovanje z napetostjo v zaporni smeri.
Ta preskusna metodologija je še zlasti primerna za preskušanje Schottkyjevih diod, za katere je značilno povečanje uhajavega toka kot funkcije napetosti v zaporni smeri pri visoki temperaturi, zato so bolj dovzetne za termični pobeg.
Preskusni vzorci, ki uporabljajo diode P/N kot obvodne diode, so izvzeti iz preskusa termičnega pobega, zahtevanega v tem dokumentu, ker je zmogljivost diod P/N, da vzdržijo napetost v zaporni smeri, dovolj visoka.

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SIST EN 62979:2018
Photovoltaic module - Bypass diode - Thermal runaway test
Ta slovenski standard je istoveten z: EN 62979:2017
27.160 6RQþQDHQHUJLMD Solar energy engineering
SIST EN 62979:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62979:2018

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SIST EN 62979:2018



October 2017
ICS 27.160

English Version
Photovoltaic module - Bypass diode - Thermal runaway test
(IEC 62979:2017)
Essai d'emballement thermique portant sur les diodes de Photvoltaik-Module - Bypass-Diode - Prüfung des
dérivation des modules photovoltaïques thermischen Durchgehens
(IEC 62979:2017) (IEC 62979:2017)
This European Standard was approved by CENELEC on 2017-09-14. 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 62979:2017 E

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SIST EN 62979:2018
EN 62979:2017
European foreword
The text of document 82/1269/FDIS, future edition 1 of IEC 62979, prepared by IEC/TC 82 “Solar
photovoltaic energy systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 62979:2017.

The following dates are fixed:
(dop) 2018-06-14
• 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) 2020-09-14
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 shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 62979:2017 was approved by CENELEC as a European
Standard without any modification.

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SIST EN 62979:2018
EN 62979:2017

Annex ZA
Normative references to international publications
with their corresponding European publications
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)
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:
Publication Year Title EN/HD Year
IEC/TS 61836 -  Solar photovoltaic energy systems - - -
Terms, definitions and symbols


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SIST EN 62979:2018

IEC 62979


Edition 1.0 2017-08



Photovoltaic modules – Bypass diode – Thermal runaway test




ICS 27.160 ISBN 978-2-8322-4587-3

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