1、BRITISH STANDARD BS EN 60034-11:2004 Rotating electrical machines Part 11: Thermal protection The European Standard EN 60034-11:2004 has the status of a British Standard ICS 29.160 BS EN 60034-11:2004 This British Standard was published under the authority of the Standards Policy and Strategy Commit
2、tee on 9 February 2005 BSI 9 February 2005 ISBN 0 580 45409 6 National foreword This British Standard is the official English language version of EN 60034-11:2004. It is identical with IEC 60034-11:2004. It supersedes BS 4999-111:1987 which is withdrawn. The UK participation in its preparation was e
3、ntrusted to Technical Committee PEL/2, Rotating electrical machines, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications refer
4、red to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provis
5、ions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation,
6、or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 13 and a back cover. The BSI copyright noti
7、ce displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 60034-11 NORME EUROPENNE EUROPISCHE NORM November 2004 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisat
8、ion Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60034-11:2004 E ICS 29.160 English version Rotat
9、ing electrical machines Part 11: Thermal protection (IEC 60034-11:2004) Machines lectriques tournantes Partie 11: Protection thermique (CEI 60034-11:2004) Drehende elektrische Maschinen Teil 11: Thermischer Schutz (IEC 60034-11:2004) This European Standard was approved by CENELEC on 2004-10-01. CENE
10、LEC 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 a
11、pplication to the Central Secretariat 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 Central Secre
12、tariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norw
13、ay, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Foreword The text of document 2/1299/FDIS, future edition 2 of IEC 60034-11, prepared by IEC TC 2, Rotating machinery, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60034-11 on
14、 2004-10-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2005-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2007-10-
15、01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60034-11:2004 was approved by CENELEC as a European Standard without any modification. _ Page2 EN6003411:2004 CONTENTS INTRODUCTION.4 1 Scope5 2 Normative references 5 3 Definitions .5 4 Thermal pr
16、otection limits .6 5 Protection against thermal overloads with slow variation .6 6 Protection against thermal overloads with rapid variation.7 7 Restart after tripping8 8 Type Tests 8 8.1 General8 8.2 Verification of temperature due to the thermal overloads with slow variation.8 8.3 Verification of
17、temperature due to thermal overloads with rapid variation8 9 Routine tests .9Figure 1 Example of thermal overload with slow variation and direct thermal protectino 9 Figur2 e E xamplfo e thermla overloaw dith slow variation in teh casfo e too intenvise intermtitetn periodci udty with starting (duty
18、S4) and direct tehrmap lrotection 10 Figur3 e E xamplfo e thermla overloaw dith rpaid variatino whert ehe thermlaly critical part has direct tehrmal proetction 11 Figur4 e E xamplfo e thermla overloaw dith rpaid variatino whert ehe tehrmlaly critical part has idnirect tehrmap lrotection21Tbale 1 aMx
19、imum widnign temepraturse for overloads iwth slow variation7. Tbale 2 aMximum widnign temepraturse for overloads iwth rapid variation.7. TNOCENTS NITRODCUTION.4 1 Scope5 2 oNrmative referencse .5. 3 eDfinitions 5. 4 Tehrmap lrotection limist 6. 5 Protection aaginst thermal overlosda wiht slow variat
20、ion 6. 6 Protection aaginst thermal overlosda wiht rapid variatino7. 7 eRsatra ttfer tripping.8. 8 Type Tesst .8. 8.1 Geenral.8. 8.2 Verificatino fo temeprature deu to teh thermla overloasd with slow variation8. 8.3 Verificatifo no temeprature deu to tehrmal overlaosd with rapid variation.8. 9 Routi
21、ne etsst 9.Figure 1 Example of thermal overload with slow variation and direct thermal protection 9 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 10 Figure 3 Example of thermal ov
22、erload with rapid variation where the thermally critical part has direct thermal protection 11 Figure 4 Example of thermal overload with rapid variation where the thermally critical part has indirect thermal protection12Table 1 Maximum winding temperatures for overloads with slow variation.7 Table 2
23、 Maximum winding temperatures for overloads with rapid variation7 3egaP 4002:1143006NE Annex ZA (normative) Normative references to international publications with their corresponding European publications . 13 Page3 EN6003411:2004 INTRODUCTION Thermal protection systems are based on the principle o
24、f protecting or monitoring the vulnerable machine parts against excessive temperatures. This requires the selection of the appropriate thermal protection device to suit both the type of protection required and the machine component to be protected. This standard does not detail the protection method
25、s available or specify the protection method to be used for particular applications but instead it specifies the temperature of the protected parts that should not be exceeded if a fault or machine abuse occurs. The requirements are not intended to guarantee a “normal“ machine life for all condition
26、s of use, but rather to avoid both failure and accelerated premature thermal ageing of the winding insulation. The requirements result from a compromise since the level of protection should neither be set so low that it causes nuisance tripping nor so high that it allows continuous working at temper
27、atures that will seriously affect the life of the winding insulation. Normal insulation life can only be ensured by correct motor application and maintenance. Frequent operation at above the normal temperature limits, see IEC 60034-1, which cannot be prevented by built-in thermal protection without
28、risking nuisance tripping may lead to a noticeable reduction in machine life. It should be noted that the life of the winding insulation is approximately halved for every 8 K to 10 K increase in the continuous operating temperature. The requirement to incorporate thermal protection in a machine is a
29、 matter for agreement. The application of this standard should be a matter of agreement between the user and the machine manufacturer. Page4 EN6003411:2004 ROTATING ELECTRICAL MACHINES Part 11: Thermal protection 1 Scope This part of IEC 60034 specifies requirements relating to the use of thermal pr
30、otectors 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 machines manufactured in accordance with IEC 60034-12 with the voltage limits speci
31、fied in IEC 60034-12. The protection of bearings and other mechanical parts is not included. NOTE 1 Although temperature values given in this standard are higher than those specified in IEC 60034-1, they are not in conflict. NOTE 2 Additional requirements may apply to particular motor types such as
32、those used in household appliances, or for motors used in explosive atmospheres. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the r
33、eferenced document (including any amendments) applies. IEC 60034-1:2004, Rotating electrical machines Part 1: Rating and performance IEC 60034-12:2002, Rotating electrical machines Part 12: Starting performance of single- speed three-phase cage induction motors 3 Terms and definitions For the purpos
34、es of this part of IEC 60034, the following terms and definitions apply. 3.1 thermal protection protection of windings of a machine against excessive temperature resulting from conditions of overload or loss of cooling 3.2 thermal protection system system for the protection of a machine winding agai
35、nst excessive temperature resulting from conditions of overload or loss of cooling by means of either thermal protector(s) or thermal detector(s) 3.3 thermal detector electrically insulated device that is only sensitive to temperature, capable of initiating a switching function in a protection syste
36、m when its temperature reaches a predetermined level Page5 EN6003411:2004 3.4 thermal protector electrically insulated device that is sensitive to the temperature of the machine winding which carries machine current, capable of directly switching off the machine when its temperature reaches a predet
37、ermined level NOTE Some thermal protectors are sensitive to both temperature and current, the combination of which activates the direct switching off of the machine. 3.5 thermal overload with slow variation overload condition or loss of cooling that produces a rise of temperature that is sufficientl
38、y slow that the temperature of the thermal protector or detector follows it without appreciable delay 3.6 thermal overload with rapid variation overload condition or loss of cooling that produces a rise of temperature that is too rapid for the temperature of the thermal protector or detector to foll
39、ow without appreciable delay resulting in a significant temperature difference between the thermal device and the part to be protected 3.7 maximum temperature after tripping the maximum value of the temperature that is reached by the protected part of the machine during the period which follows trip
40、ping by the thermal protection system 3.8 direct thermal protection form of protection where the part of the machine in which the thermal detector(s) or thermal protector(s) are incorporated is the part for which protection is being provided 3.9 indirect thermal protection form of protection where t
41、he part of the machine in which the thermal detector(s) or thermal protector(s) are incorporated is not the part for which protection is being provided 4 Thermal protection limits Machines shall be capable of operating at rated output and at all operating conditions according to IEC 60034-1 without
42、activation of the thermal protection device. The thermal protection device shall limit the winding temperature in accordance with Clauses 5 or 6. 5 Protection against thermal overloads with slow variation When subjected to an overload or other misuse condition causing overheating with slow variation
43、, the protection system shall operate to prevent the temperature of the machine winding from exceeding the values in Table 1. Examples of the rise in temperature as a function of time is shown in Figures 1 and 2. Page6 EN6003411:2004 Table 1 Maximum winding temperatures for overloads with slow varia
44、tion Thermal class 130(B) 155(F) 180(H) Maximum insulated winding temperature C 145 170 195 The winding temperature shall be determined by the resistance method in accordance with the requirements of 8.6.2 of IEC 60034-1. NOTE 1 The limit values Table 1 exceed the thermal classification and thus wil
45、l reduce the lifetime of the motor, if the motor is operated over a longer period of time with these values. NOTE 2 Some of the ways in which a thermal overload with slow variation may be caused are: Defects in ventilation or the ventilation system due to excessive dust in the ventilation ducts, or
46、dirt on windings or frame cooling ribs, etc. An excessive rise in ambient temperature or the temperature of the cooling medium. Gradual increasing mechanical overload. Prolonged voltage drop, over-voltage or unbalance in the machine supply. Excessive duty on a motor rated for intermittent duty. Freq
47、uency deviations. NOTE 3 The maximum temperature limits are based on experience taking into account factors such as ambient temperature, variations in supply voltage and normal requirements for starting motors. 6 Protection against thermal overloads with rapid variation When a thermal overload with
48、rapid variation is applied to the machine, the thermal protection system shall operate to prevent the temperature of the machine winding from exceeding the values given in Table 2. A current overload relay does not normally provide protection against repeated rapid overload variations and the use of
49、 a thermal protection device should be considered Examples of the rise in temperature as a function of time are shown in Figures 3 and 4. Table 2 Maximum winding temperatures for overloads with rapid variation Thermal class 130(B) 155(F) 180(H) Maximum insulated winding temperature C 225 240 260 The winding temperature shall be determined by direct measurements such as thermocouples in accordance with the requir
