1、BSI Standards PublicationMagnetic materialsPart 11: Method of test for the determination of surface insulation resistance of magnetic sheet and strip BS EN 60404-11:2013BS EN 60404-11:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 60404-11:2013. It is iden
2、tical to IEC 60404-11:1991, incorporating amendments 1:1998 and 2:2012. It supersedes BS EN 10282:2001 which is withdrawn.The start and finish of text introduced or altered by amendment is indicated in the text by tags. Tags indicating changes to ISO text carry the number of the ISO amendment. For e
3、xample, text altered by ISO amendment 1 is indicated by .The UK participation in its preparation was entrusted to Technical Committee ISE/108, Magnetic Alloys and Steels.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purpor
4、t to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2013 Published by BSI Standards Limited 2013ISBN 978 0 580 79761 3ICS 17.220.01; 29.030Compliance with a British Standard cannot confer immunity from legal ob
5、ligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2013.Amendments/corrigenda issued since publicationDate Text affectedEUROPEAN STANDARD EN 60404-11 NORME EUROPENNE EUROPISCHE NORM February 2013 CENELEC European Committee fo
6、r Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung 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. Re
7、f. No. EN 60404-11:2013 E ICS 17.220.01; 29.030 Supersedes EN 10282:2001 English version Magnetic materials - Part 11: Method of test for the determination of surface insulation resistance of magnetic sheet and strip (IEC 60404-11:1991 + A1:1998 + A2:2012) Matriaux magntiques - Partie 11: Mthode des
8、sai pour la dtermination de la rsistance disolement superficiel des tles et feuillards magntiques (CEI 60404-11:1991 + A1:1998 + A2:2012) Magnetische Werkstoffe -Teil 11: Messverfahren fr die Bestimmung des Oberflchenisolationswiderstandes von Elektroblech und band (IEC 60404-11:1991 + A1:1998 + A2:
9、2012) This European Standard was approved by CENELEC on 2012-12-31. 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 bibliograp
10、hical 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 responsi
11、bility 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,
12、 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. EN 60404-11:2013 - 2 - Foreword
13、This document (EN 60404-11:2013) consists of the text of IEC 60404-11:1991 + A1:1998 + A2:2012 prepared by IEC TC 68 “Magnetic alloys and steels“. The following dates are fixed: x latest date by which the document has to be implemented at national level by publication of an identical national standa
14、rd or by endorsement (dop) 2013-12-31 x latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2015-12-31 This document supersedes EN 10282:2001. Attention is drawn to the possibility that some of the elements of this document may be the subject of paten
15、t 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 60404-11:1991 + A1:1998 + A2:2012 was approved by CENELEC as a European Standard without any modification. BS EN 60404-11:2013 2 CON
16、TENTS 1 Scope and field of application 5 2 Principle of measurement . 5 3 Test specimen 6 4 Apparatus . 6 4.1 Contact assembly 6 4.2 Power supply 7 4.3 Current measurement . 7 4.4 Determination of applied force . . 8 5 Calibration . . 9 6 Measuring procedure . . 9 7 Evaluation of surface insulation
17、resistance . . 9 8 Test report . . 10 Figure 1 Arrangement of apparatus for the measurement of surface insulation resistance . 5 Figure 2 Arrangement of stabilizing circuit: mode A . . 8 Figure 3 Arrangement of stabilizing circuit: mode B . . 8 BS EN 60404-11:201360404-11 IEC:1991+A1:1998 +A2:2012 5
18、 MAGNETIC MATERIALS Part 11: Method of test for thedetermination of surface insulationresistance of magnetic sheet and strip 1 Scope and field of application This International Standard is intended to define a measurement method for the determinationof the characteristics of surface insulation resis
19、tance of magnetic sheet and strip. This method is applicable to magnetic sheet and strip insulated on one or both surfaces and issuitable for manufacturing control in the application of insulation coatings. 2 Principle of measurement The principle of the measurement is based on, and includes, the me
20、thod originally described byFranklin*which characterizes only one coated surface at a time. The arrangement of the apparatus is shown in figure 1. Ten metallic contacts of fixed area areapplied to one coated surface of the sheet, under specified conditions of voltage and pressure. The effectiveness
21、of the surface insulation is assessed by the measurement of the currentsthrough the 10 contacts. Power supplyMicro-processorDisplayInsulationcoatingContact buttons(a total of 10)Test specimenTwist drillfor contactIEC 1 595/98Figure 1 Arrangement of apparatus for the measurement ofsurface insulation
22、resistance *Franklin, R.F., “Measurement and control of interlaminar resistance of laminated magnetic cores“, ASTMBulletin, no. 144, January 1947, p. 57. BS EN 60404-11:201360404-11 IEC:1991+A1:1998 +A2:2012Because the current path is between the contacts and the metallic substrate, this is not a tr
23、ue measurement of interlaminar resistance. However, this test provides a useful indication ofsurface insulation quality. 3 Test specimen 6 Each contact button is individually fed from a d.c. power supply in one of the two ways whichconstitute the two modes of measurement used in this standard, namel
24、y: a) Mode A The voltage between the supply side of the 5 : 1 % resistors (see figure 2) and the drill contacts is stabilized at 500 mV 0,5 % over a current range of 0 to 1 A. TheBS EN 60404-11:2013b) Mode B The voltage between each contact button and the drill contacts is stabilized at250 mV 0,5 %
25、over a current range from 0 to 2,5 A for the analysis of individual electrode currents. The two twist drills perform different functions. One drill provides the currentTo obtain a representative result, test specimens shall be taken from the full sheet width. 4 Apparatus 4.1 Contact assembly The tes
26、t specimen is pressed between a plate and the contact assembly. The contact assemblyconsists of 10 vertically-mounted metallic rods which move axially against springs in amounting block. These 10 contact rods are normally arranged in two rows. However, forconvenience these 10 contacts can be arrange
27、d in one row. Each rod shall be provided with acontact button of bronze or other suitable material (for example, stainless steel) and shall beelectrically insulated from the mounting frame. NOTE Articulation of contact buttons improves contact by compensating for minor misalignments. Each of the 10
28、contact buttons shall have a contact area of 64,5 mm 1 %, giving a total areafor the 10 buttons of 645 mm 1 %. Electrical contact with the substrate of the test specimen shall be achieved by means of twospring-loaded twist drills of about 3 mm diameter which pierce the insulation coating. Thetwo twi
29、st drills perform the function of current return contacts with the substrate.The two twist drills perform different functions. One drill provides the current return contactwith the substrate. The other drill serves as a potential sensor for the voltage feedback control.This method removes the influe
30、nce of the variable contact resistance between the currentreturn drill and the substrate.The voltage across subsidiary current sensing resistors of low-value, connected in series witheach electrode, but not included within the stabilized voltage, serves to indicate the value of thecurrent, as shown
31、in figures 2 and 3.Each test specimen shall be formed from a single sheet or length of strip. The width and lengthof the test specimen shall be respectively greater than the width and length of the contactassembly described in clause 4. This measurement is destructive; the test specimen can onlybe u
32、sed once. 60404-11 IEC:1991+A1:1998 +A2:2012BS EN 60404-11:2013 7 60404-11 IEC:1991+A1:1998 +A2:20124.2 Power supply Mode A: A d.c. power supply capable of maintaining a stabilized voltage of 500 mV across the electrodes at a current of 0,1 A per electrode (1,0 A total) shall be used. Mode B: A d.c
33、power supply capable of maintaining a stabilized voltage of 250 mV at a current of 2,5 A for an individual electrode shall be used. A single supply and a current-sensing resistor, Rs, can be used and switched to each contact button in turn, or a 10-outlet system can be used with each electrode fed s
34、imultaneously and independently. 4.3 Current measurement The current flowing through the contact buttons shall be measured with an uncertainty of 2% or better. This can be achieved by inserting a low value (e.g. 0,2 ) resistor in the supply to the contact buttons, at a point outside the connection t
35、o the stabilizing circuit, and measuring the voltage drop across the low value resistor by means of a suitable voltmeter. The electrical arrangements of the stabilizing circuit and current measurement system are shown in figures 2 and 3 for modes A and B respectively. 8 Voltmeter RsTwist drills Test
36、 specimen Output U = 0,5 VFeedback voltage 5 : 5 : 5 : 5 : 5 : 5 : 5 : 5 : 5 : 5 : Contact buttons Stabilized d.c.power supply IEC 471/12 Figure 2 Arrangement of stabilizing circuit: mode A Voltmeter RsStabilized d.c.power supply Twist drills Test specimen Output U = 0,25 V Feedback voltage Contact
37、buttons Potential sensor Current return IEC 472/12 Figure 3 Arrangement of stabilizing circuit: mode B 4.4 Determination of applied force BS EN 60404-11:2013 The total force applied by all of the contacts pressing on the test specimen shall be determinedby any suitable means with an uncertainty of 5
38、 % or better.60404-11 IEC:1991+A1:1998 +A2:2012If the insulation quality of a single surface is to be evaluated in the test, 10 readings shall be taken us-ing the 10 contact buttons on 10 separate representative areas of the sheet or on 10 test specimens. If the insulation quality of both surfaces i
39、s to be jointly evaluated in the test then five applications of thecontact buttons shall be made to each surface on five separate representative areas or test specimens.The same area of the test specimen shall not be used to test both sides. 7 Evaluation of surface insulation resistance The recorded
40、 currents shall be used to calculate reported values of insulation resistance in thefollowing ways: a) For Mode A, the coefficient of surface insulation resistance shall be determined by inserting the 10values of the current flowing through the 10 electrodes in parallel (either all from one surface
41、or fivefrom each of the two coated surfaces) in the following formula: 0,5 5064510 101A101A 101101I ,RI UA C (1) 60404-11 IEC:1991+A1:1998+A2:2012 9 5 Calibration The calibration of the system shall be checked in three ways: a)b)c) Standard resistors of 0,1 :, 1 :, 10 : and 100 : connected between t
42、he drills and each electrodein turn shall be used to show that the stabilization is adequate and that the required current levelscan be achieved. 6 Measuring procedure The test specimen shall be positioned between the baseplate and the 10 contact buttons and a forceof 1 290 N 5 % shall be gradually
43、applied. This corresponds to a pressure of 2 N/mm for the totalcontact area of 645 mm. The electrodes and drills shall be applied to a clean copper sheet at nominal testingpressure. The total current passing through the 10 electrodes shall be 1,0 A 3 % formode A. For mode B the electrode to drill vo
44、ltage shall be less than 25 mV with a currentof 2,5 A flowing. If this is not the case, the electrodes shall be checked for cleanliness and thetwist drills checked for sharpness and contact resistance.Carbon paper pressed onto white paper by the electrodes at nominal testing pressure shallgive a set
45、 of even smudges free from signs of force concentration. Pressure measurementsheets that could indicate applied pressure as colour density variations can be used insteadof the carbon paper and white paper.The stabilized d.c. voltage shall be gradually applied to the electrodes and the total current
46、formode A, or each electrode current for mode B, shall be recorded individually or by computer.BS EN 60404-11:2013The test report may also include: e) the value of 101AI f) the value of 1001B 10 where C is the coefficient of surface insulation resistance, in :mm2/sideA is the total area of the 10 co
47、ntact buttons, in mm U is the voltage applied to the contacts and 5 : resistors, in V R is the resistance in series with each contact, equal to 5 :IAis the measured total electrode current (10 values), in A NOTE If five measurements are taken from each surface, the value C is the coefficient of the
48、surface insulationresistance of one surface, which represents the mean of the two surfaces of the product. b) For Mode B, the surface insulation resistance shall be calculated from each of the 100 values of electrode current using the formula: R = 0,25 / IB(2) where R is the surface insulation resis
49、tance, in :IBis the individual electrode current, in A The 100 resistance values shall be arranged in ascending order of magnitude. The results shallbe expressed as marker values R16and R50where R16 is the 16th value and R50is the 50thvalue. NOTE For the purposes of building engineering insight into the applicability of resul
