kSIST FprEN IEC 60034-11:2020
(Main)Rotating electrical machines - Part 11: Thermal protection
Rotating electrical machines - Part 11: Thermal protection
IEC 60034-11:2020 is available as IEC 60034-11:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60034-11:2020 specifies requirements relating to the use of thermal protectors and thermal detectors incorporated into the stator windings or placed in other suitable positions in induction machines in order to protect them against serious damage due to thermal overloads. It applies to single-speed three-phase 50 Hz or 60 Hz cage induction motors in accordance with IEC 60034-1 and IEC 60034-12 that:
- have a rated voltage up to 1 000 V;
- are intended for direct-on-line or star-delta starting.
The main changes with respect to the previous edition are:
- the additional specification of winding temperature limits for temperature class 200 (N),
- the increased limits of maximum winding temperatures for overloads with rapid variation,
- the clarification that the motor winding may be permanently damaged after it has been exposed to temperatures
- a clarification of the definition of indirect thermal protection,
- a clarification on the test methods for larger motors.
Drehende elektrische Maschinen - Teil 11: Thermischer Schutz
Machines électriques tournantes - Partie 11: Protection thermique
IEC 60034-11:2020 est disponible sous forme de IEC 60034-11:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 60034-11:2020 spécifie les exigences relatives à l’utilisation de protecteurs et détecteurs thermiques incorporés dans les enroulements statoriques, ou autres emplacements adaptés, dans les machines à induction afin de les protéger contre de graves dommages dus aux surcharges thermiques. Elle s’applique aux moteurs triphasés à induction à cage à une seule vitesse fonctionnant à 50 Hz ou 60 Hz conformément à l’IEC 60034-1 et à l’IEC 60034-12 qui:
- ont une tension assignée jusqu’à 1 000 V;
- sont prévus pour un démarrage direct ou étoile-triangle.
Par rapport à l’édition précédente, les modifications majeures sont les suivantes
- spécification supplémentaire relative aux limites de température de l’enroulement pour la classe thermique 200 (N),
- augmentation des limites des températures maximales d’enroulement pour surcharges à évolution rapide,
- précision concernant l’enroulement du moteur qui peut être endommagé de façon permanente après une exposition aux températures,
- précision de la définition de protection thermique indirecte,
- précision, au 8.3, concernant les méthodes d’essai pour les moteurs plus importants.
Električni rotacijski stroji - 11. del: Toplotna zaščita
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN IEC 60034-11:2020
01-april-2020
Električni rotacijski stroji - 11. del: Toplotna zaščita
Rotating electrical machines - Part 11: Thermal protection
Drehende elektrische Maschinen - Teil 11: Thermischer Schutz
Machines électriques tournantes - Partie 11: Protection thermique
Ta slovenski standard je istoveten z: prEN IEC 60034-11:2020
ICS:
29.160.01 Rotacijski stroji na splošno Rotating machinery in
general
oSIST prEN IEC 60034-11:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN IEC 60034-11:2020
2/1979/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60034-11 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2020-01-31 2020-04-24
SUPERSEDES DOCUMENTS:
2/1959/CD,2/1978/CC
IEC TC 2 : ROTATING MACHINERY
SECRETARIAT: SECRETARY:
United Kingdom Mr Charles Whitlock
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if any, in
this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
TITLE:
Rotating electrical machines – Part 11: Thermal protection
PROPOSED STABILITY DATE: 2023
NOTE FROM TC/SC OFFICERS:
Copyright © 2019 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.
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– 2 – IEC CDV 60034-11 © IEC 2020
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Definitions . 6
4 Thermal protection limits . 7
5 Protection against thermal overloads with slow variation . 7
6 Protection against thermal overloads with rapid variation. 8
7 Restart after tripping . 8
8 Type Tests . 9
8.1 General . 9
8.2 Verification of temperature due to the thermal overloads with slow variation. . 9
8.3 Verification of temperature due to thermal overloads with rapid variation. . 9
9 Routine tests . 10
Figure 1 – Example of thermal overload with slow variation and direct thermal
protection . 10
Figure 2 – Example of thermal overload with slow variation in the case of too intensive
intermittent periodic duty with starting (duty S4) and direct thermal protection . 11
Figure 3 – Example of thermal overload with rapid variation where the thermally
critical part has direct thermal protection . 12
Figure 4 – Example of thermal overload with rapid variation where the thermally
critical part has indirect thermal protection . 13
Table 1 – Maximum winding temperatures for overloads with slow variation . 8
Table 2 – Maximum winding temperatures for overloads with rapid variation . 8
2
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IEC CDV 60034-11 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –
Part 11: Thermal protection
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
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60034-11 has been prepared by IEC technical committee 2: Rotating
machinery.
This third edition cancels and replaces the second edition published in 2004. This edition
constitutes a technical revision and applies to electrical machines manufactured in accordance
with IEC 60034-12.
The main changes with respect to the previous edition are
- the additional specification of winding temperature limits for temperature class 200 (N),
- the increased limits of maximum winding temperatures for overloads with rapid variation,
- the clarification that the motor winding may be permanently damaged after it has been
exposed to temperatures according to Table 2,
- a clarification of scope,
- a clarification on the definition of indirect thermal protection,
- a clarifying note in clause 6,
- the conversion of note 3 in clause 6 into normal text including changes in wording,
- the incorporation of note 3 in clause 5 into clause 2,
- a clarification on the test methods for larger motors in clause 8.3.
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The text of this standard is based on the following documents:
FDIS Report on voting
2/1299/FDIS 2/1309/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until the
maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
2WG12(Sec)259A
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IEC CDV 60034-11 © IEC 2020 – 5 –
1 INTRODUCTION
2 Thermal protection systems are based on the principle of protecting or monitoring the vulnerable
3 machine parts against excessive temperatures. This requires the selection of the appropriate
4 thermal protection device to suit both the type of protection required and the machine
5 component to be protected. This standard does not detail the protection methods available or
6 specify the protection method to be used for particular applications but instead it specifies the
7 temperature of the protected parts that should not be exceeded if a fault or machine abuse
8 occurs.
9 The requirements are not intended to guarantee a "normal" machine life for all conditions of
10 use, but rather to avoid both failure and accelerated premature thermal ageing of the winding
11 insulation. The requirements result from a compromise since the level of protection should
12 neither be set so low that it causes nuisance tripping nor so high that it allows continuous
13 working at temperatures that will seriously affect the life of the winding insulation.
14 Normal insulation life can only be ensured by correct motor application and maintenance.
15 Frequent operation at above the normal temperature limits, see IEC 60034-1, which cannot be
16 prevented by built-in thermal protection without risking nuisance tripping may lead to a
17 noticeable reduction in machine life. It should be noted that the life of the winding insulation is
18 approximately halved for every 8 K to 10 K increase in the continuous operating temperature.
19 The requirement to incorporate thermal protection in a machine is a matter for agreement. The
20 application of this standard should be a matter of agreement between the user and the machine
21 manufacturer.
22
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23 ROTATING ELECTRICAL MACHINES –
24
25 Part 11: Thermal protection
26
27
28 1 Scope
29 This part of IEC 60034 specifies requirements relating to the use of thermal protectors and
30 thermal detectors incorporated into the stator windings or placed in other suitable positions in
31 induction machines in order to protect them against serious damage due to thermal overloads.
32 It applies to single-speed three-phase 50 Hz or 60 Hz cage induction motors in accordance with
33 IEC 60034-1 and IEC 60034-12 that:
34 • have a rated voltage up to 1 000 V;
35 • are intended for direct-on-line or star-delta starting.
36 Not included are:
37 • direct protection of the rotor winding; the methods of protection only protect rotor windings
38 indirectly; for large motors (particularly 2 pole motors) and for motors starting large inertia
39 loads, special attention needs to be given to rotor heating both when starting and especially
40 after a "trip" has occurred;
41 • the protection of bearings and other mechanical parts;
42 • the protection methods to be used for particular applications.
43 NOTE 1 Although temperature values given in this s
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