EN 60255-149:2013
(Main)Measuring relays and protection equipment - Part 149: Functional requirements for thermal electrical relays
Measuring relays and protection equipment - Part 149: Functional requirements for thermal electrical relays
IEC 60255-149:2013 specifies minimum requirements for thermal protection relays. This standard includes specification of the protection function, measurement characteristics and test methodologies. The object is to establish a common and reproducible reference for evaluating dependent time relays which protect equipment from thermal damage by measuring a.c. current flowing through the equipment. Complementary input energizing quantities such as ambient, coolant, top oil and winding temperature may be applicable for the thermal protection specification set forth in this standard. This standard covers protection relays based on a thermal model with memory function.
Messrelais und Schutzeinrichtungen - Teil 149: Funktionsanforderungen an den thermischen Überlastschutz
Relais de mesure et dispositifs de protection - Partie 149: Exigences fonctionnelles pour les relais électriques thermiques
La CEI 60255-149:2013 spécifie les exigences minimales relatives aux relais de protection thermique. Cette norme inclut la spécification de la fonction de protection, les caractéristiques de mesure et les méthodes d'essais. L'objet est d'établir une référence commune et reproductible pour des relais à temps dépendant qui protègent un dispositif contre les détériorations thermiques par la mesure du courant alternatif circulant dans le dispositif. Des grandeurs d'alimentation d'entrée complémentaire, telles que la mesure de la température ambiante, du liquide de refroidissement, de l'huile isolante, des enroulements, peuvent être applicables pour la spécification de protection thermique définie dans la présente norme. La présente norme couvre les relais de protection basés sur un modèle thermique à fonction de mémoire.
Merilni releji in zaščitna oprema - 149. del: Funkcionalne zahteve za termoelektrične releje
Ta del skupine standardov IEC 60255 določa minimalne zahteve za toplotne zaščitne releje. Ta standard zajema specifikacije zaščitne funkcije, merilnih značilnosti in preskusnih metodologij. Cilj tega standarda je vzpostaviti splošno in ponovljivo sklicevanje za oceno odvisnih časovnih relejev, ki opremo ščitijo pred toplotno škodo z merjenjem izmeničnega toka, ki teče skozi opremo. Dopolnilne vhodne energetske veličine, kot so temperatura okolja, hladilnega sredstva, vrhnjega olja in navitja, se lahko uporabljajo za specifikacijo toplotne zaščite iz tega standarda. Ta standard zajema zaščitne releje na podlagi toplotnega modela s spominsko funkcijo. Tudi preskusne metodologije za preverjanje zahtevanih lastnosti toplotne zaščitne funkcije in točnosti so zajete v tem standardu. Ta standard ni namenjen obravnavi razredov odklopnikov za zaščito pred toplotno preobremenitvijo iz standardov IEC 60947-4-1 in IEC 60947-4-2 v zvezi z elektromehanskimi in elektronskimi zaščitnimi napravami za nizkonapetostne zaganjalnike motorjev.
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2014
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SIST EN 60255-8:2001
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Measuring relays and protection equipment - Part 149: Functional requirements for
thermal electrical relays
/
Relais de mesure et dispositifs de protection - Partie 149: Exigences fonctionnelles pour
les relais électriques thermiques
Ta slovenski standard je istoveten z: EN 60255-149:2013
ICS:
29.120.70 Releji Relays
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 60255-149
NORME EUROPÉENNE
October 2013
EUROPÄISCHE NORM
ICS 29.120.70 Supersedes EN 60255-8:1998
English version
Measuring relays and protection equipment -
Part 149: Functional requirements for thermal electrical relays
(IEC 60255-149:2013)
Relais de mesure et dispositifs de Messrelais und Schutzeinrichtungen -
protection - Teil 149: Funktionsanforderungen an den
Partie 149: Exigences fonctionnelles pour thermischen Überlastschutz
les relais électriques thermiques (IEC 60255-149:2013)
(CEI 60255-149:2013)
This European Standard was approved by CENELEC on 2013-09-03. 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
CENELEC
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
© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60255-149:2013 E
Foreword
The text of document 95/313/FDIS, future edition 1 of IEC 60255-149, prepared by IEC/TC 95
"Measuring relays and protection equipment" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN 60255-149:2013.
The following dates are fixed:
(dop) 2014-06-03
• 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) 2016-09-03
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60255-8:1998.
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 60255-149:2013 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60034-11 NOTE Harmonized as EN 60034-11.
IEC 60947-4-1 NOTE Harmonized as EN 60947-4-1.
IEC 60947-4-2 NOTE Harmonized as EN 60947-4-2.
IEC 61850-9-2 NOTE Harmonized as EN 61850-9-2.
- 3 - EN 60255-149:2013
Annex ZA
(normative)
Normative references to i nternational 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 When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 60050 Series International Electrotechnical Vocabulary - -
(IEV)
IEC 60085 2007 Electrical insulation - Thermal evaluation and EN 60085 2008
designation
IEC 60255-1 - Measuring relays and protection equipment - EN 60255-1 -
Part 1: Common requirements
IEC 61850-7-4 - Communication networks and systems for EN 61850-7-4 -
power utility automation -
Part 7-4: Basic communication structure -
Compatible logical node classes and data
object classes
IEC 60255-149 ®
Edition 1.0 2013-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Measuring relays and protection equipment –
Part 149: Functional requirements for thermal electrical relays
Relais de mesure et dispositifs de protection –
Partie 149: Exigences fonctionnelles pour relais électriques thermiques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX X
ICS 29.120.70 ISBN 978-2-8322-1005-5
– 2 – 60255-149 © IEC:2013
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Specification of the function . 8
4.1 General . 8
4.2 Input energizing quantities/energizing quantities . 9
4.3 Binary input signals . 9
4.4 Functional logic . 10
4.4.1 Equivalent heating current . 10
4.4.2 Basic (setting) and operating current values for thermal protection . 10
4.4.3 Thermal level calculation . 11
4.4.4 Time-current limit characteristic equations and curves . 12
4.4.5 Thermal level alarm threshold . 14
4.5 Binary output signals . 15
4.5.1 General . 15
4.5.2 Operate (trip) output signal . 15
4.5.3 Alarm signal . 15
4.5.4 Other binary output signals . 15
4.6 Additional influencing factors on thermal protection . 16
4.6.1 General . 16
4.6.2 Influence of ambient temperature on thermal protection . 16
4.6.3 Thermal reset facilities . 16
4.7 Behaviour of thermal protective device during auxiliary power supply failure . 17
5 Performance specification . 17
5.1 Accuracy related to the characteristic quantity . 17
5.2 Accuracy related to the operate time . 17
5.3 Performance during frequency variations . 18
6 Functional test methodology . 18
6.1 General . 18
6.2 Determination of steady-state errors related to the operating current value . 19
6.3 Determination of steady-state errors related to the characteristic quantity and
the operate time . 19
6.3.1 Accuracy determination of the cold curve . 19
6.3.2 Accuracy determination of the hot curves . 20
6.4 Performance with specific cooling thermal time constant . 21
6.5 Performance with harmonics . 22
6.6 Performance during frequency variations . 22
6.7 Performance during different ambient temperatures . 23
7 Documentation requirements . 24
7.1 Type test report . 24
7.2 Other user documentation . 24
Annex A (informative) Simple first-order thermal model of electrical equipment. 26
Annex B (informative) Thermal electrical relays which use temperature as setting
parameters . 41
Bibliography . 46
60255-149 © IEC:2013 – 3 –
Figure 1 – Simplified thermal protection function block diagram . 9
Figure 2 – Typical examples of characteristic curves for cold state of a first-order
thermal system with no previous load before overload occurs . 13
Figure 3 – Typical examples of characteristic curves for hot states of a first-order
thermal system for different values of previous load before overload occurs . 14
Figure A.1 – An electrical equipment to be thermally protected represented as a
simple first-order thermal system . 26
Figure A.2 – Equivalence between a first-order thermal system and an electric parallel
RC circuit . 30
Figure A.3 – Analogue thermal circuit representation of a simple first-order thermal
system . 31
Figure A.4 – Analogue thermal circuit representation of a simple first-order thermal
system – motor starting condition . 31
Figure A.5 – Analogue thermal circuit representation of a simple first-order thermal
system – motor stopped condition . 31
Figure A.6 – Dynamic step response of a simple first-order thermal system algorithm to
a current below pickup . 33
Figure A.7 – Dynamic step response of a first-order thermal system (cold initial state) . 34
Figure A.8 – Dynamic step response of a first-order thermal system (hot initial state) . 34
Figure A.9 – Dynamic step response of a first-order thermal system to a load current
followed by an overload current (initial state: cold) . 35
Figure A.10 – Dynamic step response of a first-order thermal system to a load current
followed by an overload current (initial state: hot) . 35
Table 1 – Limiting error as multiples of assigned error . 18
Table 2 – Test points of the cold curve . 20
Table 3 – Test points of the hot curve .
...
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