1、4 * POWER TRANSFORMERS Part 2: Temperatur.e rise (IEC 76-2, modified) * a IT ISSUE : First - 7980-07-1 I EUROPEAN CBMHITTEE FOR ELECTROTECHNICAL STANDARDIZATION - CENELEC HARMONIZATION DOCUMENT HD 398.2 This Harmonization Document was adoptedby CENELEC on 1979-11=20. The National Electrotechnical Co
2、mmittees, 1ember6 of CEFIIEC, in . A : Austria B : Belgium CH : Switzerland D : Germany DK : Denmark E. : Spain F : France I : Italy . IRL : Ireland , L : Luxemburg . . N : Norway MI : Netherlands . P : Portugal 8 . : Sweden SF ; Finland UK . : United Kingdom Reference of the re levant National Harm
3、onized .Standards Overleaf are obliged, in accordance with the CENELEC Internal Regulations, to implement this Harmonization Document in their respective country by - - Issuing harmonized national s.tandard(s) and/or - Withdrawing conflicting national standard(6) . Latest date of implementation I98I
4、-OI-OI _. . . . OVE-M 20 Teil 1/1972 A B : SP (NBN c 52-101) CH . D . .VDE 0532/1971, nderung a (1975) IEC/DS 76-2 (1978) ._ DK : E : SP (UNE 20 101) F * NF C.52-100 (1970) I : SP (CE1 14-4) IRL : NOS L : NOS N . NL: NEN 3184 (1970) P : NOS s SEN 27 O1 O1 (1968) SF : NOS ,. NOS No national standard
5、corresponding to the Harmonization Document SP Standard in preparation . NR -Standard under revision - . A dev National deviation due to B dev National deviation due to for a transitional period regulations particular technical requirements -. HARMONIZATION DOCUKENT DOCUkZhT D HARNONISATION HARMONIS
6、IERUNGSDOKUHF,NT HD 398.2 NOVEMBER 1979 Date of approvhl: 1979-11-20 UDC: 621.314.21 : 621.3.077 : 003.62 : 620,1 : 536;5 Key words : Power transformers - temperature rise - cooling methods - temperature rise limits - tests of temperature rise English Version POWER TRANSFORMERS Part 2: Temperature r
7、ise TRANSFORMATEURS DE PU1 SSANCE Deuxime partie : Echauffement TRANSFORMATOREN Teil 2: bertemperaturen This document was prepared by CENELEC TC 14 and the final draft bore the reference CENELEC/TC 14(SEC)14, May 1979- . C E N.E L E C - EUROPEAN COMMITTEE FOR ELECTROTECHNICAL STANDARDIZATION COMITE
8、EUROPEEN DE NORMALISATION ELECTROTECHNIQUE EUROPISCEES KOMITEE FUR +ELEKTROTECHNISCHE NORMTNG GENERAL SECRETARIAT : 2, Rue Brderode, Bote no5 1000 BRUSSELS Copyright .o reserved to national member Organizations 3404583 0005443 L E -2- HD 338.2 Foreword This Harmonization Document was prepared by CEN
9、ELEC TC 14, following the decisions taken at a meeting in Frankfurt on 15-.i6 February 1979 on the results of a CENELEC questionnaire on IEC Publication 76-2. The complete text of this IEC standard is endorsed as exception of some commonly agreed CENELEC modifications to the follo- wing clauses or s
10、ub-clauses : 398.2 with th2 2.1 Normal temperature-rise limits 3 Test of temperature-rise (type test) The date of implementation for all members of CENELEC is 1981-01-01 Note : No National deviation has been required. HD 398.2 POWER TRANSFORMERS PART 2 : TMPEFUTURE RISE The full text of IEC Publicat
11、ion 76-2 (1976) shall apply except for following clauses where CENELEC common modifications have been agreed. CLAUSE 2.1 AMENDMENT Amend the last line of the first paragraph so that the text of the paragraph becomes : “The temperature-rises of the windings, cores and oil.shall not exceed the limits
12、specified in tables III and IV when these t,emperature- rises are determined in accordance with clause 3 (for the most unfavourabie tappingfor those transformers fitted with taminas havine. a rated power exceeding 3.15 HVA and for those smaller transformers having a tapping range exceeding - + 5 % ;
13、 for the principal tapping, unless other- wise specified, in all other cases)“. Add the following note at the end of the sub-clause : Note : For those transformers to which arc-suppression coils are connected, the above-mentioned temperature-rise limits may be exceeded in case of addi- tional neutra
14、l loading (see sub-clause 5.1 of Publication 606 - First Edition, 1978 - .“Application Guide for power transformers“) . I At the beginning of this clause, immediately after the title, add : Preliminary note : I1 For transformers fitted with tappings, it is stated in Harmonization Document 398.4, .re
15、spec; tively in sub-clauses 2.6 and 3.2.b),that : - the temperature-rise limits are valid for all tappings but, except in special cases, the . temperature-rise test need be carried out on only one tapping, - when the category of voltage variation is constant flux voltage variation“, this tapping, fo
16、i- transformers with separate windings, is the “maximum current tapping“, unless otherwise specified“. II REASON See reason below for amendment to clause 3. As several CENELEC countries are using arc-suppression coils, it is advisable to have here this reference to the IEC Application Guide. This addition is an edito- * 11 modification making easiei Lhe use of this HD for transfor- mers fitted with tappings (when IEC standard 76-2 was prepared, IEC standard 76-4 was not yet published and consequently there is a certain lack of coordination between these two documents).
