1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationSpecification for high-voltagefuse-links for motor circuit applicationBS EN 60644:2009National forewordThis British Standard is the UK implementation of EN 60644:2009. It is iden
2、ti-cal to IEC 60644:2009. It supersedes BS EN 60644:1993 which is withdrawn.The UK participation in its preparation was entrusted to Technical CommitteePEL/32, Fuses.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to
3、include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2010ISBN 978 0 580 59133 4ICS 29.120.50Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPol
4、icy and Strategy Committee on 31 January 2010Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60644:2009EUROPEAN STANDARD EN 60644 NORME EUROPENNE EUROPISCHE NORM December 2009 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normali
5、sation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: Avenue Marnix 17, B - 1000 Brussels 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60644:2009 E ICS 29.120.50 Supersedes EN 60644:
6、1993English version Specification for high-voltage fuse-links for motor circuit application (IEC 60644:2009) Spcification relative aux lments de remplacement haute tension destins des circuits comprenant des moteurs (CEI 60644:2009) Anforderungen fr Hochspannungs-Sicherungseinstze fr Motorstromkreis
7、e (IEC 60644:2009) This European Standard was approved by CENELEC on 2009-10-01. 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 a
8、nd bibliographical references concerning such national standards may be obtained on application 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 respo
9、nsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany
10、, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 60644:2009EN 60644:2009 - 2 - Foreword The text of document 32A/267/CDV, future edition 2
11、 of IEC 60644, prepared by SC 32A, High-voltage fuses, of IEC TC 32, Fuses, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60644 on 2009-10-01. This European Standard supersedes EN 60644:1993. The main changes with regard to EN 60644:1993 concern the following: upda
12、te of the normative references; renewal of the figures. 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) 2010-07-01 latest date by which the national standards conflicting with
13、 the EN have to be withdrawn (dow) 2012-10-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60644:2009 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following note has to b
14、e added for the standard indicated: IEC 60470 NOTE Harmonized as EN 60470:2000 (not modified). _ BS EN 60644:2009- 3 - EN 60644:2009 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispens
15、able for the application of this document. 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 (m
16、od), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60282-1 2005 High-voltage fuses - Part 1: Current-limiting fuses EN 60282-1 2006 BS EN 60644:2009 2 60644 IEC:2009 CONTENTS 1 Scope.5 2 Normative references .5 3 Fuse-link time-current characteristics .5 4 K factor 6 5 Withstand
17、requirements6 6 Withstand tests.6 6.1 General .6 6.2 Test sequence No. 1 .7 6.3 Test sequence No. 2 .7 6.4 Interpretation of the test results.8 7 Information to be given to the user .8 8 Selection of fuse-links for motor circuit applications and correlation of fuse-link characteristics with those of
18、 other components of the circuit.9 8.1 Selection of fuse-links .9 8.2 Co-ordination with other circuit components 9 Bibliography12 Figure 1 Diagrams of the test sequences .7 Figure 2 Determination of K factor for fuse-links of intermediate rating of a homogeneous series.8 Figure 3 Characteristics re
19、lating to the protection of a motor circuit .11 BS EN 60644:200960644 IEC:2009 5 SPECIFICATION FOR HIGH-VOLTAGE FUSE-LINKS FOR MOTOR CIRCUIT APPLICATIONS 1 Scope This standard applies primarily to fuse-links used with motors started direct-on-line on alternating current systems of 50 Hz and 60 Hz. N
20、OTE When motors are used with assisted starting this specification can also be applied but particular attention should be paid to the selection of the rated current of the fuse-link (see 8.1) and the manufacturer of the fuse-link should preferably be consulted. Fuse-links according to this specifica
21、tion are intended to withstand normal service conditions and motor starting pulses. They should comply with the requirements of IEC 60282-1. The purpose of this standard is to standardize time-current characteristics, to formulate pulse withstand requirements regarding testing and to give guidance r
22、egarding the selection of fuse-links intended to be used with motors. 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 referenced d
23、ocument (including any amendments) applies. IEC 60282-1:2005, High-voltage fuses Part 1: Current-limiting fuses 3 Fuse-link time-current characteristics Compared to fuses typically used for distribution system protection, fuses for motor circuit protection should have: relatively high melting curren
24、t (slow operation) in the 10 s region of the pre-arcing time-current characteristic to give maximum withstand against motor starting current; relatively low melting current (fast operation) in the region below 0,1 s to give maximum short-circuit protection to associated switching devices, cables and
25、 motors and their terminal boxes. Therefore pre-arcing time-current characteristics of fuse-links for motor circuit applications shall be within the following limits: 3/10nIIffor 100nI4/10nIIffor 100nI()25,010020/1,0nnIIIf for all current ratings where Inis the numerical value of the current rating,
26、 expressed in amperes, of the fuse-link; BS EN 60644:2009 6 60644 IEC:2009 10fI and 1,0fI are the numerical values of the pre-arcing currents, expressed in amperes, corresponding to 10 s and 0,1 s respectively, as mean values with the tolerances specified in 4.11 of IEC 60282-1. The term ()25,0100nI
27、 is introduced to take account of the fact that the pre-arcing time-current characteristics for a range of fuse-links diverge as they approach the short-time region. 4 K factor Factor which defines an overload characteristic to which the fuse-link may be repeatedly subjected under specified motor st
28、arting conditions, and other specified motor-operating overloads, without deterioration. For the purpose of this specification, the value of K is chosen at 10 s. Unless otherwise stated by the fuse-link manufacturer, it is valid from 5 s to 60 s, for a frequency of starts up to six per hour and for
29、not more than two consecutive starts. For conditions different from those specified above, for example where service conditions involve inching, plugging or more frequent starts, the manufacturer should be consulted. The overload characteristic is obtained by multiplying the current on the pre-arcin
30、g characteristic by K (less than unity). 5 Withstand requirements The performance of a fuse-link for motor circuit applications is in general determined by the following criteria: to withstand without deterioration starting pulses in rapid succession due for example to abnormal conditions, such as t
31、hose occurring during commissioning of the equipment; to withstand without deterioration a large number of motor starts in normal service conditions. This standard therefore specifies two sequences of tests representative of these conditions: 100 cycles corresponding to abnormal service conditions;
32、2 000 cycles corresponding to normal service conditions. It is expected that a fuse-link which passes these tests will have a good behaviour during a satisfactory life duration. 6 Withstand tests 6.1 General The withstand tests are type tests. Both test sequences shall be carried out on the same fus
33、e-link. The fuse-link shall be tested under the same test conditions as in 6.5.1.2 of IEC 60282-1. The values of test currents shall be 10fIK for pulses simulating the motor starting pulses and 610fIK for periods simulating the normal motor running, 10fI being the pre-arcing current at 10 s. The tol
34、erance on both values shall be 100+%. The duration of individual pulses shall be 10 s. The tolerance on the 10 s periods, both pulses and off periods, shall be 0,5 s. Tests shall be made at any convenient voltage and at a frequency from 48 Hz to 62 Hz. BS EN 60644:200960644 IEC:2009 7 6.2 Test seque
35、nce No. 1 This test sequence shall comprise 100 cycles of 1 h as follows: a current 10fIK for 10 s; an off period of 10 s; a current 10fIK for 10 s; a current 610fIK for 3 560 s; an off period of 10 s. 6.3 Test sequence No. 2 This test sequence shall comprise 2 000 cycles of 10 min as follows: a cur
36、rent 10fIK for 10 s; a current 610fIK for 290 s; an off period of 300 s. Test sequences No.1 and No.2 are illustrated in Figure 1. KIf10KIf10/6 0 10 20 30 3 590 3 600t (s) 100 cyclesTest sequence No. 1 KIf10KIf10/6 0 10 300 600 t (s) 2 000 cycles Test sequence No. 2 IEC 1526/09 IEC 1527/09 Figure 1
37、Diagrams of the test sequences BS EN 60644:2009 8 60644 IEC:2009 6.4 Interpretation of the test results After each test sequence is completed, the fuse-link shall be allowed to cool. After cooling, there shall have been no significant change in its characteristics. A check need not be made until aft
38、er completion of both test sequences. Measurements to show that there is no significant difference in the values of resistance of the fuse-links before and after test give an indication of conformity with this requirement. In case of doubt, a further method is to subject the fuse-link after cooling
39、after test to the current 10fIK sustained for a sufficient time to cause the fuse-element to melt. The pre-arcing time shall lie within the tolerances of the pre-arcing time-current characteristic given by the manufacturer. If fuse-links form part of a homogeneous series as defined in items d), e) a
40、nd f) of 6.6.4.1 of IEC 60282-1, the maximum and minimum current ratings only need be tested. If the same value of K is assigned to both maximum and minimum current ratings, then that value may also be deemed to apply to all intermediate current ratings within the homogeneous series. If different va
41、lues of K are assigned to the maximum and minimum current ratings, then the K factors for intermediate ratings may be determined by linear interpolation; see Figure 2. If a manufacturer assigns a higher value of K for an intermediate rating than that resulting from interpolation, this assigned value
42、 shall be proved by tests to the requirements of Clause 6. Pre-arcing current at 10 s Maximumcurrent rating Intermediate currentratingMinimumcurrentrating K IEC 1528/09 Figure 2 Determination of K factor for fuse-links of intermediate rating of a homogeneous series 7 Information to be given to the u
43、ser Although in principle any high-voltage fuse-link can be used to protect motor circuits, there are advantages in selecting a fuse-link specifically designed for this application. BS EN 60644:200960644 IEC:2009 9 For fuse-links intended to be used for motor circuit protection, the manufacturer sha
44、ll state the K factor which will indicate to the user the degree to which the fuse-link is capable of withstanding cyclic overloads without deterioration. It shall be stated if the K factor is related to the minimum or the mean pre-arcing time-current characteristic. The pre-arcing time-current char
45、acteristic of the fuse-link with current values multiplied by factor K thus defines the boundary of the overload curve for a given number of motor starts per hour. 8 Selection of fuse-links for motor circuit applications and correlation of fuse-link characteristics with those of other components of
46、the circuit 8.1 Selection of fuse-links The fuse-link is inserted into the motor circuit that the fuse-link is intended to protect. Some ratings of the fuse-links (e.g. rated voltage and rated breaking current) are therefore dependent on the system and others (e.g. rated current) are dependent on th
47、e motor. The ability to withstand repetitive starting conditions is an important factor. When selecting a fuse-link for a given motor circuit application, due regard should be paid to the K factor, which should be applied to the pre-arcing time-current characteristic of the fuse-link to take account
48、 of these starting conditions. The usual concept of rated current, based upon the ability of a fuse-link to carry a given current continuously without exceeding a specified temperature rise, is usually of secondary importance where the motor is started direct-on-line. The fuse-link for such applicat
49、ions is normally chosen by reference to the paragraphs above. However, when the fuse-links are enclosed in motor circuit equipment, it should be verified that their rated current exceeds the running current of the motor by an amount sufficient to take account of the effects of the temperature of the air surrounding them (see Annex F of IEC 60282-1). Where assisted starting is used and thereby starting currents are reduced, the above method of selecti
