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1、BRITISH STANDARD BS 7821-2.1: 1995 Three phase oil-immersed distribution transformers, 50 Hz, from 50 to 2500 kVA with highest voltage for equipment not exceeding 36 kV Part 2: Distribution transformers with cable boxes on the high voltage and/or low voltage side Section 2.1 General requirements (Im
2、plementation of CENELEC HD 428.2.1 S1:1994) UDC 621.314.212 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:29:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7821-2.1:1995 This British Standard, having been prepared under the direction of the Electrotechnic
3、al Sector Board, was published under the authority of the Standards Board and comes into effect on 15 September 1995 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference PEL/14 Draft for comment 92/29074 DC ISBN 0 580 24718 X Committees responsible for th
4、is British Standard The preparation of this British Standard was entrusted to Technical Committee PEL/14, Power transformers, upon which the following bodies were represented: Association of Consulting Engineers BEAMA Ltd. (Transmision and Distribution Association) British Cable Makers Confederation
5、 British Pump Manufactures Association British Railways Board Electricity Association Institution of Plant Engineers Transmission and Distribution Association (BEAMA Ltd.) Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank Universi
6、ty, Fri Dec 08 12:29:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7821-2.1:1995 BSI 07-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 1General3 2Definitions3 3Electrical characteristics3 4Design characteristics4 5Transformer requirements4 6Distance bet
7、ween bushings5 7Tests5 Figure 1 Transformer with cable boxes, type 1 side mounted6 Figure 2 Unit substation transformer, with cable boxes type 1 side mounted7 Figure 3 Transformers with cable boxes, type 1 cover mounted8 Figure 4 Cover mounted, air filled common HV/LV cable box type 28 Figure 5 Unit
8、 substation transformers, cover mounted9 Figure 6 Typical flange for flange box10 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:29:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7821-2.1:1995 ii BSI 07-1999 National for
9、eword This British Standard has been prepared by Technical Committee PEL/14 and implements HD 428.2.1 S1:1994, published by the European Committee for Electrotechnical Standardization (CENELEC). A British Standard does not purport to include all the necessary provisions of a contract. Users of Briti
10、sh Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred toCorresponding British Standard HD 398.3:1986BS 171 Power transformers Part 3:1987 Specification for insula
11、tion levels and dielectric tests BS 7821 Three phase oil-immersed distribution transformers, 50 Hz, from 50 to 2 500 kVA with highest voltage for equipment not exceeding 36 kV HD 428.1 S1:1992Part 1:1995 General requirements and requirements for transformers with highest voltage for equipment not ex
12、ceeding 24 kV HD 428.3:1994Part 3:1995 Supplementary requirements for transformers with highest voltage for equipment equal to 36 kV HD 506 S1:1989BS 7616:1993 Specification for bushings for liquid filled transformers above 1 kV and up to 36 kV Summary of pages This document comprises a front cover,
13、 an inside front cover, pages i and ii, the HD title page, pages 2 to 10, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: Londo
14、n South Bank University, London South Bank University, Fri Dec 08 12:29:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI HARMONIZATION DOCUMENT DOCUMENT DHARMONISATION HARMONISIERUNGSDOKUMENT HD 428.2.1 S1 May 1994 UDC 621.314.212 Descriptors: Transformer, three-phase transformer, immersed transformer,
15、 distribution transformer, termination in cable boxes, design characteristic, dimension English version Three phase oil-immersed distribution transformers 50 Hz, from 50 to 2 500 kVA with highest voltage for equipment not exceeding 36 kV Part 2: Distribution transformers with cable boxes on the high
16、 voltage and/or low voltage side Section 1: General requirements Transformateurs triphass de distribution immergs dans lhuile, 50 Hz, de 50 2 500 kVA, avec une tension la plus leve pour le matriel ne dpassant pas 36 kV Partie 2: Transformateurs de distribution raccords par boites cable ct haute tens
17、ion et/ou ct basse tension Section 1: Prescriptions gnrales Drehstrom-l-Verteilungstransformatoren 50 Hz von 50 bis 2 500 kVA, mit einer hschten Spannung fr Betriebsmittel bis 36 kV Teil 2: Verteilungstransformatoren mit Kabelanschluksten auf der Ober- und/oder Unterspannungsseite Hauptabschnitt 1:
18、Allgemeine Anforderungen This Harmonization Document was approved by CENELEC on 1993-09-22. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of this Harmonization Document on a national level. Up-to-date lists and bibliog
19、raphical references concerning national implementation may be obtained on application to the Central Secretariat or to any CENELEC member. This Harmonization Document exists in three official versions (English, French, German). CENELEC members are the national electrotechnical committees of Austria,
20、 Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee
21、fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1994 Copyright reserved to CENELEC members Ref. No. HD 428.2.1 S1:1994 E Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:29:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
22、7821-2.1:1995 BSI 07-1999 2 Foreword This Part 2.1 of HD 428 was prepared by WG 5 of Technical Committee TC 14, Power transformers. It covers the general arrangement of the transformer when intended to be equipped with cable boxes. This feature is commonly used in some countries of Europe for public
23、 distribution and in most countries for industrial applications. The document was submitted to the formal vote and was approved by CENELEC as HD 428.2.1 S1 on 1994-09-22. The following dates were fixed: latest date of announcement of the HD at national level(doa) 1994-04-01 latest date of publicatio
24、n of a harmonized national standard(dop) 1994-10-01 latest date of withdrawal of conflicting national standards(dow) 1994-10-01 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:29:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7821-2.1:1995 BSI 07-19993 1 Ge
25、neral HD 428.1 subclause 3.3 states that a distribution transformer could have different termination features. The following constructional situations are possible: i) Termination in open type (oil-air) bushings without protection. This is covered by HD 428.1, HD 428.3, HD 506, HD 596 and HD 607. ii
26、) Termination in plug-in type bushings of inside or outside cone type. This is covered by HD 428.1, HD 428.3 and HD 506. iii) Termination in air filled or oil/compound filled cable boxes or protective enclosure using open type and/or oil-oil bushings, as defined in HD 428.2.2. iv) Flange boxes and s
27、imilar solutions using open type bushings can also be used. This document covers, in conjunction with HD 428.1, distribution transformers under iii) and iv) above, up to 24 kV. An annex may in the future be issued to cover 36 kV. Further documents exist which may be used by agreement between purchas
28、er and manufacturer for cable boxes and enclosures. The dimensional requirements for cable boxes and protective enclosures are not included in this document. Unless otherwise stated in this document, HD 428.1 shall be applied. 2 Definitions For the purposes of this document, distribution transformer
29、s shall be classified according to the following definitions: 2.1 transformers with cable boxes, side mounted a transformer with electrical characteristics in the range defined in HD 428.1 with facings on the transformers tank side for provision of cable boxes, Type 1. These facings shall be on oppo
30、site sides of the transformer (as Figure 1) 2.2 transformers with cable boxes or similar, cover mounted a transformer with electrical characteristics in the range defined in HD 428.1, with terminations mounted on the tank cover. The terminations exit in such a way as to provide for cables on opposit
31、e sides of the transformer. The type of termination can be either cable box Type 1 or cable box Type 2 (as Figure 3, Figure 4) 2.3 unit substation transformer, side mounted a transformer with electrical characteristics in the range defined in HD 428.1, having facings on the transformers tank side fo
32、r provision of HV switchgear and LV equipment. These facings shall be on the same side of the transformer (as Figure 2) 2.4 unit substation transformer, cover mounted a transformer with electrical characteristics in the range defined in HD 428.1, with terminations mounted on the tank cover and enclo
33、sed in a flange box Figure 5 shows a typical arrangement, however, dimension should be agreed between manufacturer and purchaser 2.5 cable boxes, Type 1 a metallic box designed for receiving and protecting the ends of HV or LV cables so that the cable dielectric may be effectively sealed against moi
34、sture damage. A minimum protection of IP54 is required. These boxes are not specified in this section. A higher protection, IP65, may be necessary to satisfy termination requirements 2.6 cable boxes, Type 2 a metallic or non-metallic enclosure designed to prevent accidental contact with live parts.
35、The enclosure can be common to HV and LV terminations or be independent for HV and LV. A protection between IP33 and IP55 is required and is subject to agreement between manufacturer and purchaser 2.7 flange box an enclosure designed to provide flanges for mounting ancillary equipment on opposite si
36、des of the transformer as Figure 5 and Figure 6. The box is mounted on the cover of the transformer. The IP rating is dependent on the mounted equipment and is subject to agreement between manufacturer and purchaser 3 Electrical characteristics These shall comply with HD 428.1 S1 clause 2. In respec
37、t of subclause 2.9 a), also List 1 for impulse withstand voltage is admitted. To derive the insulation and dielectric test level, the impulse withstand voltage shall be taken from HD 398.3 Table II List 1 or List 2 as agreed between manufacturer and purchaser. Licensed Copy: London South Bank Univer
38、sity, London South Bank University, Fri Dec 08 12:29:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7821-2.1:1995 4 BSI 07-1999 4 Design characteristics 4.1 Type of oil preservation and degree of sealing These shall comply with subclause 3.1 of HD 428.1. 4.2 Terminal markings These shall comply wi
39、th subclause 3.2 of HD 428.1. 4.3 Provision for cable box Type 1 connections Facings shall be provided for mounting HV and LV bushing assemblies and cable boxes, as detailed in Figure 1, Figure 2 and Figure 3 of this document. Fixing methods shall be provided on transformer facings positioned as def
40、ined on the appropriate drawings given in Figure 1, Figure 2 and Figure 3. 4.4 Provision for cable box Type 2 Facings shall be provided for mounting HV and LV bushing assemblies with cable box Type 2 as shown in Figure 4 and Figure 5. The use of independent HV and LV enclosure shall be subject to ag
41、reement between manufacturer and purchaser. 5 Transformer requirements 5.1 Transformers with cable boxes, mounted on both sides Limiting dimensions are indicated in Figure 1. The underbase is generally in the form of skids, provided with axle holes. Four jacking lugs shall be provided, if specified
42、by the purchaser. Two lifting fittings shall be provided of adequate section. These shall be positioned to facilitate lifting in a reasonably upright position, taking into account the cable box weight. These weights to be given by the purchaser if necessary. Unless otherwise stated, cable boxes Type
43、 1 as defined in 2.5 shall be fitted to the high voltage facing and a bushing assembly shall be fitted to the low voltage facing. The termination of the low voltage shall be specified by purchaser at time of enquiry. Other accessories shall comply with HD 428.1 clause 5 and shall preferably be mount
44、ed on one end of the tank and shall not be obstructed by coolers. Unless otherwise agreed, two earthing terminals shall be fitted on the centre line, one below each connection facing, with the connection hole placed on the lower part of the tank. 5.2 transformers with cable boxes, cover mounted Ther
45、e are no limiting dimensions. The accessories shall comply with clause 5 of HD 428.1. 5.2.1 Cable box Type 1. A cable box Type 1 shall be fitted to the high voltage flange. The termination of the low voltage shall be as specified by the purchaser at time of enquiry. One method of cover mounting cabl
46、e boxes Type 1 is shown in Figure 3 of this document which defines its own flange fitting that shall always be maintained. 5.2.2 Cable box Type 2. A cable box Type 2 is provided for either both high voltage and low voltage terminations or only one of them. This shall be agreed between manufacturer a
47、nd purchaser. One method of cover mounting cable boxes Type 2 is shown in Figure 4 of this document. 5.3 Unit substation transformer, with cable boxes mounted on the same side Limiting dimensions are indicated in Figure 2. A stable fixing for HV switchgear equipment can be requested by the purchaser
48、, in a position as indicated in Figure 2. The requirements of this fixing are subject to agreement between purchaser and manufacturer. The fixing shall be capable of supporting an agreed load and designed so as to not load the facing flange. An LV bushing plate assembly shall be provided on a mounti
49、ng pocket. The mounting pocket flange face shall lie in the same plane as the face of the pocket provided for the HV ring main equipment. The termination of the low voltage shall be specified by the purchaser. The flange face of the mounting pockets of HV/LV shall be flat and sufficiently robust to prevent distortion and oil leakage when the agreed equipment is bolted thereto. The transformer tank with its cover removed shall be capable of withstanding the combined loads of the agreed attached equipment without distortio
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