1、A -.CENELEC REPORT In Addendum to HU 398.1 il r- NOVEMBER 1979 CT ru. - f N O O rn eo w f O f m Ecglish version Temporary national deviations from HD 398.1 POWER TRANSFORHXRS Part I: General TRANSFORMATEURS DE PU1 S SANCE Premire partie : Gnralits TRANSFORMATOREN Teil 1 : Allgemeimes This addendum l
2、ists the three B-deviations requested by Germany to HD 398.1. The estimated time for their withdrawal is by the end of 1984. , EUROPEAN COIMITTEE FOR ELECTROTECHNICAL STANDARDIZATION CBMITE EUROPEEN DE NORMALISATION ELECTROTECHNIQUE EUROPISCHES KOMITEE FUR ELEKTROTECHNISCBE NORIdUNG ?EI?ERAL SECRETA
3、RIAT : 2, rue Brderode, bolte no 5 I O00 BRUSSELS o Copyright reserved to national member organiEations e3 340L1583 0024298- CLAU SE 4.4 6.2 - 7 b -2- Addendum to HD 398.1 DEVIATION This sub-clause is completed as follows : IlThe transformer shall be capable of delivering its rated current with the
4、ratedvoltage being applied also at a frequency which devi.ates from the ra.ted frequency up to rtl 2.5 %.I1 This sub-clause is completed as follows : Generator transformers having a rated power up to 40 MVA and auxiliary supply transformers connected to generators shall withstand 1.3 times the rated
5、 voltage for 5 min in the event of a sudden load rejection! II The following sentence is added : “Unequal. tapping steps shall be useu 4 only by agreekent , except for special transformers.“ e JUSTIFICATION At the Frankfurt meeting of February 1979, it was agreed that Germany will propose. this addi
6、tion to the IEC and that, pending the decisions of the IEC, Germany viill keep this requirement in the German rules as a B-deviation This deviation is needed, in Germany, for generators when regulation has to be carried out manually, so that an al- lowable period of 5 s, as stated in the IEC standar
7、d, is not sufficient. The need for this deviation isdecreas- ing and it is expected that it will be possible to with- dfaw this deviation within 5 years. In some cases, unequal tab, -ni steps have been used, but thii solution may lead to dizficul. ties in case of parallel ope- ration. It is expected
8、 that this B-deviation rill be withdrawn within 5 years. .# * -3-. HD 398.q HD 398.1 POIITER TRANSFORMERS PART 1 : GENERAL The full text of IEC Publication 76-1 (1976) shall apply, except for following clauses where CENELEC common modifications have been agreed. 5.2 AMENDMENT Ldd a note as follows :
9、 In Austria and Germany, the air temperature lay temporarily be - 30 C. In the Scandi- kavian countries still lower limits may be igreed upon!. teplace the present text of the note after )oint “v“ by the following : Transformers immersed in synthetic insu- lating liquid containing polychlorinated ii
10、phenyls, for example askarels, shall b Fitted with a plate with wording drawing atten- :ion to the need to take care because of envi- eonmental considerations and .giving guidance in :ase of leakage or in case the whole or any )art of the transformer is disposed of as cefuse, If the presentation is
11、not. prescribed y the laws of the country of theuser : - the wording shall be the following, in the language of that country : Avoid contact with skin, eyes and food. This transformer contains polychlorobiphehyls (askarels) which must not pollute the envi- ronment. 1.n case of leakage, consult (to b
12、e filled as appropriate) When the whole or any part is disposed of as refuse, comply with local regulations. lowever the word “askarel“ nay be replaced by :he brand name of the insulating liquid. rhe lettering shall be black against a yellow mckground. - the size of the plate shall be at least - thi
13、s inscription shall be put either near the conservator or with the rating plate. :are should be taken to avoid tne inscription ecoming obliterated or the plate broken off“. 50 x 120 mm, Taking into account the climatic conditions in certain CENELEC countries. The IEC note gives only a recommendation
14、, limited to the principle : “in the case of transformers immersed in synthetic insulating liquid containing polychlorinated biphenyls, for example askarel, it is recommended that a distinctive plate be fitted with wording drawing attention to the need to take care because of environnental considera
15、tions“. In accordance with the Directives of the Council of the European Communities, this H.D. must gofurther on and include detailed requi- rements concerning the labelling of these transfor- mers. - .-I-. E 3404583 0024300 8 E CLAUSE 5.2 5 7 ppendix A AIENDMENT Add the following points “x“ and “y
16、“ : “-x) For transformers with rated power above 3150 LVA, information concerning overcurren conditions, when the short-circuit currents cannot be limited to an admissible value by transformer impedances alone : For transformers with two separate windings the information to be given is normally the
17、short-circuit apparent power of the feeding system ; in other cases the inforniation may be the .permissible short-circuit currents, the short-circuit apparent powers of the systems or the system impedances (see HD 398.5“, sub-clause i .2). -y) Characteristics of built-in equipment : For all build-i
18、n equiqment, e.,g. instrument transformers, appropriate rating plates shall be mounted additiorally or combined with the rating plate of the transformer“. Complete the firstline of the note at the end of the complete clause as follows : “Note : Plore detailed infomation, for instance regarding the c
19、ooiing system, may be given . See following page. Complete item 34 2nd add a new item 39 as follows : 134) Whether sound level measurement is to be carried out and the maximum value of sound power level if specified (see HD 399). 39) Tolerance on the voltage ratio at no-load for additional pairs of
20、windings. II HD 398.1 - ! REASON These items of information are needed by the user of the transformers as they have to be taken into account when using the transformers and it is sensible to put them on the rating plate. These itenis of information are necessary for the operation of the transformer.
21、 1nforiati.on concerning the cooling system is often needed. See following page. - . Logical addition (1 ) . See modification of item 2 of Table III of clause 7. f Iii course of preparation. I (I) fien IEC publication 76-1. was prepared, Publication 551 E u) M c: 18; 53 1.n 1- al ai u) v rl aJ rl k al 3 O a a O m Q, 2 4 a c .rl 3 w O u) k 8% O v) m. k k aJ O . Jp c O On +Ki1 . a .e. N
