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1、BRITISH STANDARD BS 7821-2.2: 1998 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 2.2 Cable boxes of type 1 for
2、 use on distribution transformers meeting the requirements of BS 7821-2.1 ICS 29.180 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:29:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7821-2.2:1998 This British Standard, having been prepared under the direct
3、ion of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 February 1998 BSI 04-1999 ISBN 0 580 29191 X National foreword This British Standard reproduces verbatim HD 428.2.2 S1:1997 and implements it as the UK national Standard. Th
4、e UK participation in its preparation was entrusted to Technical Committee PEL/14, Power transformers, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and
5、keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards nor
6、mally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “Internation
7、al Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a Britis
8、h Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the HD title page, pages 2 to 6 and a back cover. This standard has been updated (see copyright date) and may have had amendments incor
9、porated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:29:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7821-2.2:1998 BSI 04
10、-1999i Contents Page National forewordInside front cover Foreword2 Text of HD 428.2.2 S13 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:29:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank
11、University, Fri Dec 08 12:29:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI HARMONIZATION DOCUMENT DOCUMENT DHARMONISATION HARMONISIERUNGSDOKUMENT HD 428.2.2 S1 May 1997 ICS 29.180 English version Three-phase oil-immersed distribution transformers 50 Hz, from 50 to 2 500 kVA with highest voltage for
12、equipment not exceeding 36 kV Part 2: Distribution transformers with cable boxes on the high-voltage and/or low-voltage side Section 2: Cable boxes type 1 for use on distribution transformers meeting the requirements of HD 428.2.1 S1 Transformateurs triphass de distribution immergs dans Ihuile 50 Hz
13、 de 50 2 500 kVA de tension la plus leve pour le matriel ne dpassant pas 36 kV Partie 2: Transformateurs de distribution avec des botes cbles moyenne tension et/ou basse tension Section 2: Botes cbles de type 1 pour utilisation sur transformateurs de distribution conformes aux exigences du HD 428.2.
14、1 S1 Drehstrom-l-Verteilungs-transformatoren 50 Hz, 50 bis 2 500 kVA, mit einer hchsten Spannung fr Betriebsmittel bis 36 kV Teil 2: Verteilungstransformatoren mit Kabelanschluksten auf der Ober- und/oder Unterspannungsseite Hauptabschnitt 2: Kabelanschluksten Typ 1 fr Verteilungstransformatoren nac
15、h HD 428.2.1 S1 This Harmonization Document was approved by CENELEC on 1996-10-01. 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 bibliographical
16、references concerning such 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, Bel
17、gium, 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 fr E
18、lektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1997 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. HD 428.2.2 S1:1997 E Licensed Copy: London South Bank University, London South Bank University, Fri
19、Dec 08 12:29:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI HD 428.2.2 S1:1997 BSI 04-1999 2 Foreword This Harmonization Document was prepared by the Technical Committee CENELEC TC 14, Power transformers. The text of the draft was submitted to the formal vote and was approved by CENELEC as HD 428.2.2
20、 S1 on 1996-10-01. The following dates were fixed: Contents Page Foreword2 1Scope3 2Normative references3 3Definitions3 4Electrical requirements and clearances3 5Design considerations5 6Testing6 7Earthing of cable boxes6 Figure 1 Clearance distances4 Table 1 Three phase cable box, type 15 latest dat
21、e by which the existence of the HD has to be announced at national level(doa) 1997-03-01 latest date by which the HD has to be implemented at national level by publication of a harmonized national standard or by endorsement (dop) 1997-12-01 latest date by which the national standards conflicting wit
22、h the HD have to be withdrawn(dow) 1997-12-01 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:29:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI HD 428.2.2 S1:1997 BSI 04-19993 1 Scope This document specifies the requirements for cable boxes, Type 1, in which t
23、he cable cores are terminated. The cable boxes are suitable for use on transformers defined in HD 428.2.1 S1, Distribution transformers with cable boxes, for side mounted or cover mounted use. The cable boxes are suitable for operation indoors and outdoors under environmental conditions specified in
24、 HD 428.1 S1. Important design and construction requirements of the cable boxes are given. 2 Normative references This Harmonization Document incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and
25、 the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this Harmonization Document only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applie
26、s (including amendments). EN 50180:1997, Bushings above 1 kV up to 36 kV and from 250 A to 3,15 kA for liquid filled transformers. EN 60076, HD 398: series, Power transformers (IEC 76 series, modified). HD 428.1 S1:1992, Three-phase oil-immersed distribution transformers 50 Hz, from 50 to 2 500 kVA
27、with highest voltage for equipment not exceeding 36 kV Part 1: General requirements and requirements for transformers with highest voltage for equipment not exceeding 24 kV. HD 428.2.1 S1:1994, Part 2: Distribution transformers with cable boxes on the high-voltage and/or low-voltage side Section 1:
28、General requirements. HD 506 S1:1989, Bushings for liquid filled transformers above 1 kV up to 36 kV. HD 506 S1 + A1:1992, Bushings for liquid filled transformers above 1 kV up to 36 kV. HD 607 S1:1996, Busbar bushings up to 1 kV and from 1,25 kA to 5 kA, for liquid filled transformers. 3 Definition
29、s For the purpose of this document the following definitions apply: 3.1 fully insulated cable box a metallic cable box where those parts of the termination and bushing within the enclosure including live metal parts and cable cores are insulated by oil or compound suitable for the appropriate system
30、 voltage 3.2 air filled cable box A metallic cable box designed to protect the ends of the cables and bushings, providing a weatherproof enclosure with a minimum rating of IP54. 3.2.1 air insulated termination an air filled cable box within which the cable cores are electrically terminated by stress
31、 control appropriate to the cable design and voltage; air being the sole insulation for the terminal connections 3.2.2 shrouded insulation termination an air filled cable box within which the cable cores are terminated as in 3.2.1 with additional local insulation enhancement, e.g. bushing protection
32、, taping NOTEEnhancement can be achieved by using insulated phase barriers, however, in this case full creepage distance air bushings are used. 4 Electrical requirements and clearances 4.1 General The enclosures when in position on the equipment with which they are to be used shall be capable of wit
33、hstanding the high voltage tests specified in HD 428.1 S1 as well as commissioning tests to be carried out on the connected cable. 4.2 High voltage enclosures The rated voltage of a box is the highest voltage designated for the equipment and preferred values in use are given in Table 1. Table 1 defi
34、nes the minimum clearances required between live metal parts, and between live metal parts to earth, and insulator creepage requirements. The fixing flange types are as given in HD 428.2.1 S1, Figure 1. However, shorter clearances may be agreed subject to confirmation by test. Licensed Copy: London
35、South Bank University, London South Bank University, Fri Dec 08 12:29:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI HD 428.2.2 S1:1997 4 BSI 04-1999 Bushings suitable for use in high voltage enclosures are specified in document EN 50180. Other bushings can be used if agreed between manufacturer and
36、purchaser provided the minimum limiting dimensions of Table 1 are complied with. Figure 1 Clearance distances Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:29:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI HD 428.2.2 S1:1997 BSI 04-19995 Table 1 Three phase
37、cable box, type 1 Cables above 185 mm2 should not be crossed in boxes with E dimensions equal to those given. The E dimension can be extended to a dimension agreed between manufacturer and purchaser when crossed cables are required. 4.3 Low voltage boxes All low voltage boxes shall be capable of acc
38、epting either bushings or monobloc or single bloc busbar type terminations of the correct rating for the maximum current required from the transformer. The box flange is as given in HD 428.2.1 S1, Figure 1. Due consideration shall be given to the effects of electromagnetic induced losses caused by h
39、igh currents. On agreement between purchaser and manufacturer, the flange types can be different to those given. Terminations suitable for use in LV cable boxes are specified in EN 50180 and HD 607 S1. 5 Design considerations 5.1 The boxes shall be selfcontained, The bushing mounting plate is an int
40、egral part of the enclosure for HV boxes, Cast iron shall not be used. (Dimensions below in mm) Air insulation kVLIST ILIST II BILABCEBILABCE kVpSingle3 CorekVpMin.Max.Single3 Core 1260909012549558575120 120125200495585 2495160160224575685125200 200205305575685 36145270270309625880170320 32032538062
41、5880 Fully insulated oil/compound filled LIST II kVBILABCE kVpSingle3 Core 1275453250495585 241251007590575685 36170125100135625880 Shrouded LIST II kVBILABCE kVpSingle3 Core 1275555080495585 24125110100140575685 36170165150225625880 NOTEThe above clearance dimensions are minima. The design of enclo
42、sure should take account of the actual manufacturers dimensions for the terminals to ensure that all clearances are complied with. The distances given in the table are consistent with the minimum clearances necessary; the currently available bushings, however, as described in EN 50180 have distances
43、, especially C, in excess of those given in the table. This fact should be taken into account when sizing the cable box. List I distances are for use with shedded bushings. The clearances given assume that the cable termination connected to the bushing cap does not reduce the clearance dimension. Ai
44、r insulation list II C values. Minimum values are based on BS practice and experience. Maximum values are in line with HD 506 S1/A1. For voltage levels below 12 kV the dimensions A, B, C and E are subject to agreement between manufacturer and purchaser. For application of list I and list II, see HD
45、398.3 S1. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:29:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI HD 428.2.2 S1:1997 6 BSI 04-1999 Fully insulated cable boxes shall be suitably sealed to contain the oil or compound and allowance made for thermal expa
46、nsion. Ventilation measures are to be provided in the case of air filled boxes of IP 54 protection. Means of draining air filled boxes are to be provided. Filling measures are to be provided in the case of oil/compound filled boxes and due consideration made to the filling medium expansion due to te
47、mperature changes. 5.2 Terminal nuts and stems The dimensions of terminal nuts and stems are related to the bushings in use for the appropriate currents and are given in relevant standards. 5.3 Provision for glanding cables NOTEUnder consideration in TC 20. 5.4 Termination of cables within enclosure
48、 To allow for termination of cables, the minimum vertical distance from the surface of the bushing cap to the gland plate shall be as given in Figure 1. The dimension E allows for only uncrossed cables at above 185 mm2. 6 Testing 6.1 Type tests A new design of an enclosure shall be subject to the fo
49、llowing type tests if clearances lower than those given in Table 1 are used. Tests are required on the cable box not necessarily connected to the transformer. Electrical Rated Lightning Impulse Withstand on the high voltage box, terminated with cables as in service. Rated Short Duration Power Frequency Withstand on the enclosure, terminated with cables as in service. The voltage levels for these tests will be appropriate impulse and power frequency levels for the highest system voltage as defined in HD
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