1、GENERAL SECRETARIAT RUO Br6derode 2, ete 5 - 1000 BRUXELLES . T6I. 02 - SI1 79 32 - TBleX 26257 Cenlsc b . 1 IssuEl 1983-05-04 1 SHEET 1 HD 428 THREE-PHASE OIL-IMMERSED PUBLIC DISTRIBUTION TRANSFORMERS, 50 Hz, FROM 50 TO 2500 kVA, WITH HIGHEST VOLTAGE FOR EQUIPMENT NOT EXCEEDING 24 kV Transformateur
2、s triphass de Drehstromverteiungstransformator der distribution publique immergs dans ffentlichen Energieversorgung, mit lhuile, SO Hz, de SO 25O kVA, Olfllung, 50 Hz, 50 - 2500 kVA, de tension la plus leve pour mit einer hochsten Spannung fr le matriel au plus gale 24 kV Betriebsmittel kleiner oder
3、 gleich 24 kV RD: Text prepared by CENELEC TC 14 This HD consists of the following: TITLE PAGE COMMON MODIFICATIONS date of ratification: 1982-07-08 date of announcement: 1983-01-01 date of latest publication: 1984-01-01 date of withdrawal: 1987-01-01 List of national deviations Issue 1 AUGUST 1982
4、HARMONIZED NATIONAL STANDARDS: A: B: CH D: DK : E: F: GR : I: IRL : L : NOS N: NL : P : NOS s: SF : -.A- - _- ! I - W 3404583 00142bb b . HD 428 CENELEC GENERAL SECRETARIAT Rue Brderade 2, Bte 5 - 1000 BRUXELLES Tel. O2 - 511 79 32 - Telex 26257 Cenlec b I . ENGLISH VERSION UDC: 621.314.212: 62.3.02
5、5.3.026.645f. 647 Key words: Distribution transformers - electrical characteristics - dimensions impedance voltage - losses - rollers - sound levels THREE-PHASE OIL-IMMERSED PUBLIC DISTRIBUTION TRANSFORMERS, 50 Hz, FROM 50 TO 2500 kVA, WITH HIGHEST VOLTAGE FOR EQUIPMENT NOT EXCEEDING 24 kV Transform
6、ateurs triphass de Drehstramverteilungstransformator der distribution publique immergs dans ffentlichen Energieversorgong, mit lhuile, 50 Hz, de 50 2500 kVA, lfiillung, 50 Hz, 50 - 2500 kVA, de tension la plus leve pour mit einer hchsten Spannung fr le matriel au plus gale 24 kV Betriebsmittel klein
7、er oder gleich 24 kV BODY OF HD The Harmonization Document consists of: - Text prepared prepared by CENELEC TC 14 This Harmonization Document was approved by CENELEC tmd- on 8 July 1982. All texts prepared by CENELEC exist in three official versions (English, French, and German). Accordlng to the CE
8、NELEC Internal Regulations the CENELEC member National Commlt tees are bound: to announce the existence of this Harmonization Document at national level by or before 1983-01-01 to publish their new harmonized national standard by or before 1984-131-01 to withdraw all conflicting national standards b
9、y or before 1987-01-01. Harmonized national standards are listed on the HD information sheet, which is available from the CENELEC National Committees or from the CENELEC General Secretariat. The CENELEC National Cornmittees are the national electratechnical committees af Austria, Belgium, Denmark, F
10、inland, France, Germany, Greece, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, C leden, Switzerland, United Kingdom. Copyright reserved to all CENELEC members 3404583 0034267 8 CENELEC GENERAL SECRETARIAT Rue Brderode 2, Bte 5 - B 1000 BRUXELLES Tel, O2 - 511 79 32 - Telex 26257 C
11、enlec b ISSUE 1 AUGUST 1982 LIST OF NATIONAL DEVIATIONS TO HD 428 THREE-PHASE OIL-IMMERSED PUBLIC DISTRQXJTION TRANSFORMERS, 50 Hz, FROM 50 TO 2500 kVA, WITH HIGHEST VOLTAGE FOR EQUIPMENT NOT EXCEEDING 24 kV Transformateurs triphass de distribution publique immergs dans lhuile, 50 Hz, de 50 2500 kVA
12、, ,de tension la plus leve pour le matriel au plus gale 24 kV Drehs tromverteilungstransf or matar der ffentlichen Energieversorgung, mit lfllung, 50 Hz, 50 - 2500 kVA, mit einer hchsten Spannung fr Betriebsmittel kleiner oder gleich 24 kV This List of national deviations presents national ,deviatio
13、ns from the content of the Harmonization Document HD 428 which could.not be removed before the time of approval of the HD. The requirements of these deviations are applicable only in the countries concerned until the expiry of the specified date of withdrawal. Thereafter the requirements of the devi
14、ations are void. This list was prepared by CENELEC TC 14. c D Copyright reserved to ali CENELEC members = 3404583 001i4268 T -2- National deviations from the content of Harmonization.Document 428 The two deviations requested are related to the same sub-clause of the Harmonization Document, namely: 2
15、.9 b) Insulation levels and dielectric tests. Low-voltage winding. 1) A-deviation requested by Switzerland Deviation: . Replace the text of the first paragraph by the following sentence: t ?Only a short duration power frequency withstand voltage, equal to 4kV, r.m.s. value, is specified?. . Delete p
16、aragraphs 2 and? 3. Justification The withstand voltage of these windings is prescribed by clause 18 of the decree of 7 July 1933 on construction, operation and maintenance of power electrical installations: ?Verordnung ber die .Erstellung, den Betrieb und den Unterhalt von elektrischen Stromanlagen
17、 (Starkstromverordnung)?. ?Ordonnance sur l?tablissement, l?exploitation et l?entretien des . installations lectriques courant fort (ordonnance sur les installations courant fort) ?l. m 3404583 0034269 II m -3- 2) B-deviation requested by Italy . Deviation: Replace the text of paragraphs 2 and 3 by
18、the following one: . *. I8However, following the principle of the above-mentioned note of sub-clause 5.2 of HD 398.3 (i), this withstand voltage may be raised to 8 kV (r.m.s. value) ”. Justification: The experience has shown that this insulation level is sufficient. for the distribution transformers
19、 used in the Italian networks and the Italian Committee wishes to keep it, as a B-deviation, pending the revision of this clause of the Harmonization document. Proposed date for the withdrawal of the deviation: . In 5 years. 3404583 O014270 B FOREWORD Clause THREE-PHASE OIL-IMMERSED PUBLIC DISTRIBUT
20、ION TRANSFORMERS EQUIPmNT NOT EXCEEDING 24 kV 50 Hz, FROM 50 To 2500 kVA, WITH HIGHEST VOLTAGE FR CONTENTS 1. GENERAL 1.1 Scope . 1.2 Object 1.3 Compliance with current standards 2. ELECTRICAL CHARACTERISTICS .2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Page 3 .4 4 4 -4 -4 4 5 5 5 6 6 6 6 7 Rated power High
21、est voltages for equipment of windings Rated voltages of windings Voltage variation (tappings) Connections Dimensioning of neutral connection of the low voltage winding Impedance voltage at rated curent Losses Insulation level 3. DESIGN REQUIREMENTS 3.1 3.2 Terminal markings 3.3 Tank Type of oil-pre
22、servation system and sealing 4. DIbENS IONAL CEUACTERISTICS 4.1 Rollers 4.2 Distance between bushings 5. ACCESSORIES APPENDIX A : Information and guidance on noise level limits 8 8 8 8 a 8 8 9 11 -2- FOREWORD 1) General: This standard has been prepared by CENELEC - TC 14 “Power transformers“. Its pu
23、rpose is to lay down certain requirements and specify some design and service characteristics. Standardisation has advantages in manufacturing and storing, as well as in interchangeability. It is attractive to both manufacturer and user? since it results in lower costs and shortened delivery times.
24、Thus, when placing orders, the user should have every incentive to choose equipment in accordance with this standard. Due to the great -diversity in the characteristics of distribution transformers which has existed until now in the CENELEC countries, it has not been possible to reach a high degree
25、of standardization in this first edition of the standard, But the degree reached has been deemed sufficient to justify the publication of such a document, as a first step in CENELEC standardization and interchangeability. This standard is intended to be used as a common part of the National Standard
26、s of the different countries of CENELEC. This common part is to be completed by addition, or by precisions (in particular when the CENELEC standard offers several alternatives). The National Standard may also change preferred values into mandatory values. Appendix A gives some guidance for a possibl
27、e addition concerning the sound level. Some important requirements have been left outside this standard, e.g : - overall dimensions - protection against corrosion. They shall be agreed between manufacturer and purchaser unless they are specified in a National Standard. 2) National deviations: Nation
28、al deviations have been requested by two countries for sub-clause 2.9b “Insulation levels and dielectric tests - Low-voltage windingn: - A-deviation requested by Switzerfand - B-deviation requested by Italy These deviations are listed in a separate List. -3- W 3404583 OOL4272 L W THREE-PHASE OIL-IMM
29、ERSED PUBLIC DISTRIBWION TRANSFORMERS 50 HZ, FROM 50 TO 2500 kVA, WITH HIGHEST VOLTAGE FOR EQUIPMENT NOT EXCEEDING 24 kV 1. GENERAL 1.1 Scope This standa-d covers transformers from 50 to 2500 kVA intended for operation in three-phase public distribution networks. It applies to three-phase oil-ikerse
30、d transformers for indoor or outdoor continuous service, 50 Hz, natural cooling, with two windings : - a primary (high-voltage) winding with a highest voltage for equipment of 3.6 to 24 kV, - a secondary (low-voltage) winding with a highest voltage for equipment of 1.1 kV. Each winding has only one
31、rated voltage. This standard does not cover transformers in which the terminations are made in cable boxes. Note : This standard may be applied, in part or as a whole, to transformers immersed in a synthetic insulating liquid. 1.2 Object The object of this standard is to lay down certain requirement
32、s such as electrical characteristics, some dimensions and design requirements. Other requirements may be specified in a National Standard. 1.3 Compliance with current standards Transformers shall be in accordance with harmonization documents 398.1, 398.2, 398.3, 398.4, 398.5.* 2. ELECTRICAL CKARACTE
33、RISTSCS : 2.1 Rated power The values of the rated power are : 50 - 100 - 160 -. (200) - 250 - (315) - 400 - (500) - 630 - (800) - 1000 - (1250) - 1600 - (2000) - 2500 kVA. The values in brackets are non-preferred. * Correspond respectively to IEC Publications 76-1 (1976) , 76-2 (1976) , 76-3 (1980),
34、 76-4 (1976) and 76-5 (1976) with its Amendment no 1-of December 1979. HD 398.3 is still in course of preparation- 6 -4- 7- I W 3404583 0014273 3 W , Um (kV) 3.6 7.2 12 17-5 24 . UN (kV) 3 or 3.3 6 or 6.6 10 or 11 15 20 or 22 2.2 Highest voltages for equipment of windings The values of the highest v
35、oltage for equipment are : _- .J a) For the high-voltage winding : (3.6) - (7.2) - 12 - (17.5) - 24 kV. The values in brackets are non-preferred. b) For the low-voltage winding : 1.1 kV 2.3 Rated voltaqes of windinqs a) For the high-voltage winding : The preferred values of the rated voltage UN are
36、related to the values of the highest voltage for equipment Um as stated in table I :. TABLE I Note : These values of UN are equal to the values of system nominal voltages stated in IEC Publication 38 (1975) (1) b) For the low-voltage winding : The rated voltage shall be chosen from the following val
37、ues : 400 - 420 - 433 volts, Note 1 : According to IEC Publication 38, Amendment: No 3. (August 1977), the nominal voltages for low-voltage systems are 380, 408 or 415 Volts. Note 2 : This standard may be applied, in part or as a whole, t transformers with rated voltages below 400 volts 2.4 Voltage
38、variation (tappings) . The high voltage winding shall normally be provided with tappings corresponding to a tapping range of t 2.5 % OK 2 x 2.5 %. These tappings shall be connected to an off-circuit tap-changer having respectively 3 or 5 positions. (1) IEC Publication 38(1975) : IEC standard voltage
39、s -5- 2.5 Connections Connections shall be : Rated power kVA 50 100 160 250 . 400 630 1000 1600 2500 - for rated power below 250 kVA : Load Los5 No-load at 75 C Loss W w . 1100 190 1750 320 2350 460 3250 650 4600 930 6500 1300 10500 1700 1700 2600 26500 3800 Yzn or Dyn - for rated power of 250 kVA a
40、nd above The clock hour figure shall preferably be 5 or 11 2.6 Dimensioning of neutral connection of the low-voltage winding : The neutral conductor and terminal of the low-voltage winding shall be dimensioned for the rated current, unless otherwise specified, and earth fault Current. 2.7 Impedance
41、voltage at rated current : The preferred values of the impedance voltage at rated current, at a reference temperature of 75O C, are : up ta and including 630 IcVA : 4 % above 630 kVA : 6 8. 2.8 Losses : For transformers having preferred values o rated power and impedance voltage, in accordance with
42、sub-clauses 2.1 and 2.7, the values of the losses are as stated in table II. TABLE II -6- A National -Standard may specify a “Second Series“ of transformers having either no-load loss or load loss or both which difer by at least 20 3 from the values of table II and, if necessary, other electrical ch
43、aracteristics may be varied. If a National Standard considers non-preferred values of rated power or impedance voltage, it shall specify the corresponding losses. A National Standard may also allow the use of a capitalisation formula to be declared by the purchaser. 2.9 Insulation levels and dielect
44、ric tests Insulation levels and dielectric tests shall be in accordance with the requirements of HD 398.3*, as further detailed below : a) High-voltage winding : The rated values of the short duration power frequency withstand voltage and of the lightning impulse withstand voltage are given by table
45、 II of HD _. 398.3, list 2 being used for the impulse withstand voltage. However, in accordance with the note of sub-clause 5.2 of HD 398.3*, higher test voltages or additional tests may be required.(l) b) Low-voltage winding : According to table II of HD 398.3, for the normal insulation level, only
46、 a short duration power frequency withstand voltage equal to 3 kV, r.m.s. value, is specified. Eowever, following the principle of the above-mentioned note of sub-clause 5.2 of AD 398.3* (l)., the short duration power frequency withstand voltage may be raised to 10 kV (r.m.s. value) and/or a lightni
47、ng impulse test, between winding and earth, may be made with a withstand voltage equal to 30 kV (peak value). When an impulse test is made, the test voltage shall be applied between low-voltage winding (all terminals connected together) and tank, all high voltage terminals being connected together a
48、nd earthed directly or by a resistance. (i.) This note reads : Distribution transformers for suburban or rural installations are in some countries severely exposed to overvoltages. In such cases higher test voltages or additional tests, which are not mentioned here, may be agreed between manufacture
49、r and purchaser“. * HD 398-3 : In course of preparation, corresponds to IEC Publication 76-3 (2980). -7- 3404583 0014276 9 0 3 DESIGN REQUIREMENTS 3.1 Type of oil preservation system and degree of sealing : The type of oil preservation system and the degree of sealing shall be indicated in the enquiry and the order. In the case of hermetically sealed transformers without gas cushion, the maximum admissible temperature of the oil shall be indicated at the time of the enquiry, and marked on the rating pl
