1、 IEC/TR 60943Edition 2.0 2008-12TECHNICAL REPORT RAPPORT TECHNIQUEGuidance concerning the permissible temperature rise for parts of electrical equipment, in particular for terminals Guide concernant lchauffement admissible des parties des matriels lectriques, en particulier les bornes de raccordemen
2、t IEC/TR60943:1998/A1:2008 AMENDMENT 1 AMENDEMENT 1 Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2008 IEC, Geneva, Switzer
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17、3 00 Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IEC/TR 60943Edition 2.0 2008-12TECHNICAL REPORT RAPPORT TECHNIQUEGuidance concerning the permissible temperature rise for
18、parts of electrical equipment, in particular for terminals Guide concernant lchauffement admissible des parties des matriels lectriques, en particulier les bornes de raccordement INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE EICS 29.020 PRICE CODECODE PRIXISBN
19、2-8318-1018-7AMENDMENT 1 AMENDEMENT 1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or network
20、ing permitted without license from IHS-,-,- 2 TR 60943 Amend. 1 IEC:2008 FOREWORD This amendment has been prepared by IEC technical committee 32: Fuses. The text of this amendment is based on the following documents: DTR Report on voting 32/187/DTR 32/188/RVC Full information on the voting for the a
21、pproval of this amendment can be found in the report on voting indicated in the above table. 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
22、specific publication. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition; or amended. _ Page 63 Replace the existing Table 6 with the following new table: Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for Resale
23、No reproduction or networking permitted without license from IHS-,-,-TR 60943 Amend. 1 IEC:2008 3 Table 6 Typical values of temperature rise and temperature limits* Description of component Column A Maximum temperature rise Ku(an= 20 C) Column B Maximum temperature C (an= 40 C) Remarks Spring contac
24、ts Copper and copper alloys uncoated in OG t in NOGt in oil Tinned in OG, NOGt, oilb e35p75q4050 Nature of contact a, c, eSilver- b, s or nickel-plated b in OGtor NOGt in oil For contactors, in oil 75q50 105 Deterioration of the oil Bolted connections Copper, aluminium, and their alloys, uncoated in
25、 OGt in NOGt60q 75qTinnedbin OG or NOGt,105 Creep point of tin Silver- b, s or nickel-plated b in OG or NOGt in oil 75q100 Deterioration of the oil For contactors, in oil 105 Deterioration of the oil Terminals d, f,rTo be connected to exterior conductors by screws or bolts Uncoated Tinned b Silver-
26、or nickel-plated b60q75q105 Creep point of tin Other contact materials g, hMetallic parts In contact with Insulation class i: Y A E B F H enamel: oil base synthetic acting as springs at position of a tin soldering 90 105 120 130 155 180 100 120 j100 kAgeing of insulation Permanent deterioration Brea
27、king Oil for oil-immersed switchgearl, mAll parts which are metallic or of insulating material in contact with oil, except for contacts m90 100 Deterioration of the oil Electric motors and resistance nManual control components metallic non-metallic 55 65 IEC 60364-4-42 :1980 SurfacesoExpected to be
28、touched in normal operation but not to be held continuously in the hand metallic non metallic 70 80 Accessible, but not designed to be touched in normal operation metallic non metallic 80 90 * For notes, see following page. Copyright International Electrotechnical Commission Provided by IHS under li
29、cense with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- 4 TR 60943 Amend. 1 IEC:2008 NOTES a For connection units in vacuum, the limit values of temperature and temperature rise do not apply to the components in the vacuum. The other components must not exce
30、ed the temperature and temperature rise values given in Table 6. Maximum acceptable temperature rises in NOGt are the same for silver-plated or nickel-plated copper as for bare copper, because of the absence of oxygen. b The following are considered as silver contacts: solid silver contacts, contact
31、s with inlaid silver strips, silver-plated contacts. In general, for all plated metals, the quality of the plating must be such that a protective layer remains in the contact zone: 1) after the making and breaking tests (if any); 2) after the permissible short period current test; 3) after mechanica
32、l test, in accordance with the correct specification for each material. If not, the contact must be considered as “bare”. For nickel-plated contacts, the contact resistance and contact life will be equivalent to those of silver if the temperature rise is kept within the prescribed limits. This can b
33、e achieved by higher contact forces, for example. c When engaging parts have different coatings, or one part is of bare metal, the permissible temperatures and temperature rises shall be: 1) for spring-contacts, those of the surface material having the lowest value permitted in Table 6; 2) for bolte
34、d connections, those of the surface material having the highest value permitted in Table 6. d Values of the tightening torque for screws are given in the appropriate product standard, for example Table IV of IEC 60947-1:1988. e For fuses, the temperature rise to be considered can be increased to tak
35、e into account the proportion of heat from the fuse element transmitted by conduction to the contacts. Refer to the appropriate specifications for these components. f The temperature and temperature rise values are valid even if the conductor connected to the terminals is not protected by a covering
36、. g When materials other than those shown in Table 6 are used, their properties shall be taken into consideration. h Limited by the necessity of not damaging surrounding parts. i The classification of insulation is given in IEC 60085:1984. j Temperature shall not reach such a value that the elastici
37、ty of the material is reduced. k This applies when soldering is the main method of joining the two parts; otherwise, this limit may be increased to 110 C. l The measurement must be made in the upper part of the oil. m It is recommended that particular attention be paid to questions of vaporisation a
38、nd oxidation when using oil with a low flash-point. n Regulations in force. o For manual control components located inside enclosures which are accessible upon opening the enclosure, and which are not used frequently, higher temperatures may be allowed. The distinction between metallic and non-metal
39、lic surfaces depends on the thermal conductivity of the surface. Coats of paint and varnish are not considered to modify the thermal conductivity of the surface. On the other hand, certain plastic coatings can noticeably reduce the thermal conductivity of a metallic surface and allow it to be consid
40、ered as non-metallic. This rule does not apply to materials which comply with standards which state that the temperature or temperature-rise limits for accessible surfaces are fixed. p This limit can be increased to: 45 K for low voltage supply equipment downstream from meter boxes or rising mains;
41、for contactors operating on continuous service. Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TR 60943 Amend. 1 IEC:2008 5 65 K for contactors operating on 8 h, intermittent
42、 or temporary service, where conditions of use are those permitted in the appropriate product standards. q Limited by the necessity of causing no damage to adjacent parts and in particular to the insulation in contact. r For terminals intended for connection to insulated conductors, see 5.3.2. s For
43、 some low-voltage industrial equipment, the temperature rise is limited only by the need not to damage surrounding parts. t NOG = Not oxidizing gas; OG = Oxidizing gas. u Higher values can be admitted, respecting in any case Note q, if: products standards admit higher values, or manufacturers can pr
44、ove a correct long term ageing behaviour of the contacts. In this case, agreement on the acceptable values should be reached between the user and the manufacturer. _ Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking
45、permitted without license from IHS-,-,- 6 TR 60943 Amend. 1 CEI:2008 AVANT-PROPOS Le prsent amendement a t tabli par le comit dtudes 32 de la CEI: Coupe-circuit fusibles. Le texte de cet amendement est issu des documents suivants: Projet denqute Rapport de vote 32/187/DTR 32/188/RVC Le rapport de vo
46、te indiqu dans le tableau ci-dessus donne toute information sur le vote ayant abouti lapprobation de cet amendement. Le comit a dcid que le contenu de cette publication ne sera pas modifi avant la date de maintenance indique sur le site web de la CEI sous http:/webstore.iec.ch dans les donnes relati
47、ves la publication recherche. A cette date, la publication sera reconduite; supprime; remplace par une dition rvise; ou amende. _ Page 62 Remplacer le Tableau 6 existant par le nouveau tableau suivant: Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for
48、ResaleNo reproduction or networking permitted without license from IHS-,-,-TR 60943 Amend. 1 CEI:2008 7 Tableau 6 Valeurs types de limites dchauffement et de temprature* Dsignation de lorgane Colonne A Echauffementmaximal Ku(an= 20 C) Colonne B Temprature maximale C (an= 40 C) Remarques Contacts lastiques Cuivre et alliage de cuivre, nus dans GOt dans le GNOt dans lhuile Etams dans, GO
