BS英国标准BS EN 502992002 Oilimmersed cable connection assemblies for transformers and reactors.doc

BRITISH STANDARD BS EN50299:2002Oil-immersed cable connection assemblies for transformers and reactors having highest voltage for equipment Um from 72,5 kVto 550 kVThe European Standard EN 50299:2002 has the status of aBritish StandardICS 29.180 BS EN 50299:2002National forewordThis British Standard is the official English language version ofEN 50299:2002.The UK participation in its preparation was entrusted to Technical CommitteePEL/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 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-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.This British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on19 November 2002© BSI 19 November 2002ISBN 0 580 40795 0Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page,pages 2 to 11 and a back cover.The BSI copyright date displayed in this document indicates when the document was last issued.Amd. No.DateCommentsAmendments issued since publicationEUROPEAN STANDARDEN 50299NORME EUROPÉENNEEUROPÄISCHE NORMNovember 2002ICS 29.180English versionOil-immersed cable connection assemblies for transformers and reactors having highest voltage for equipment Um from 72,5 kV to 550 kVBoîte de raccordement de câble pour transformateurs immergéset bobine d'inductance de tensions comprises entre 72,5 kV et 550 kVÖlgefüllte Kabelanschlusseinheiten für Transformatoren und Drosselspulen mit einer höchsten Spannung für Betriebsmittel Um von 72,5 kV bis 550 kVThis European Standard was approved by CENELEC on 2002-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions.CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.CENELECEuropean Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische NormungCentral Secretariat: rue de Stassart 35, B - 1050 Brussels© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.Ref. No. EN 50299:2002 E 9 EN 50299:2002ForewordThis European Standard was prepared by the CENELEC Technical Committee TC 14, Power transformers.The text of the draft was submitted to the formal vote and was approved by CENELEC asEN 50299 on 2002-10-01.The following dates were fixed:-latest date by which the EN has to be implemented at national level by publication of an identicalnational standard or by endorsement(dop)2003-10-01-latest date by which the national standards conflictingwith the EN have to be withdrawn(dow)2005-10-01_Contents1Scope . 42Normative references . 43Definitions . 54Limits of supply . 65Rated values . 66Preferred values . 66.1Highest voltage for equipment . 66.2Rated current . 67Requirements. 67.1Temperature of connection interface . 67.2Mechanical requirements . 77.3Standard dimensions . 77.4Disconnecting link. 77.5Protection against corrosion . 77.6Mechanical forces on cable terminations . 88Tests . 88.1Factory tests . 88.2Tests after installation. 8Figure 1 Limits of supply for transformer end terminal and cable termination.10Figure 2 Standard dimensions for cable connection assembly.111ScopeThis standard covers the oil-immersed single-phase connection assembly of cables for transformers and reactors, designed in accordance with EN 60076 series and with EN 60289, respectively.NOTE In the standard the term "transformer" is used as common definition for transformer and reactor.The purpose of EN 50299 is to establish for the cable assemblies: the electrical and mechanical requirements, including interchangeability; the limits of supply; the test to be carried out.It complements and amends, if necessary, the relevant IEC standards and applies to oil immersed cable connections, suitable for fluid-filled or dry-type cable terminations.EN 50299 does not cover direct cable terminations (see 3.3.3), but, in this case, upon agreement between purchaser and supplier, the standard may be used for guidance except for Figure 1 and Figure 2 which are not applicable.This standard applies to oil-immersed cable connection boxes on transformers with highest voltage for equipment Um = 72,5 kV to 550 kV, including the current conductor terminal at the cable sealing end of the transformer.2Normative referencesThis European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisionsofanyofthesepublicationsapplytothisEuropeanStandardonly when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments).EN 60076EN 60289IEC 60141IEC 60296SeriesSeriesPower transformers (IEC 60076 series, mod.) Reactors (IEC 60289, mod.)Test on oil-filled and gas-pressure cables and their accessoriesSpecification for unused mineral insulating oils for transformersand switchgearIEC 60840Power cables with extruded insulation and their accessories forrated voltages above 30 kV (Um = 36 kV) up to 150 kV(Um = 170 kV) Test methods and requirementsIEC/TR2 61639Direct connection between power transformers andgas-insulated metal-enclosed switchgear for rated voltages of72,5 kV and above3DefinitionsFor the purposes of this European Standard the following definitions apply.3.1cable-connection assemblycombination of a cable termination and a cable connection box which mechanically and electrically connects the cable to the transformer3.2cable connection boxpart of the transformer which houses the cable termination and the interface to the transformer connection3.3cable terminationequipment fitted to the end of a cable to ensure electrical connection with other parts of the system and to maintain the insulation up to the point of connection3.3.1fluid-filled cable terminationcable termination which includes an insulating fluid as part of the cable connection assembly and comprises a segregation between said cable fluid in the cable connection box3.3.2dry-type cable terminationcable termination which comprises an elastomeric electrical stress control component in intimate contact with a separating insulating barrier between the cable insulation and the insulation of the cable connection box. The cable termination does not require any insulating fluid3.3.3direct cable terminationcable termination directly fitted on the end of the cable without any separating insulating barrier between the cable insulation and the insulation of the cable connection box. The cable enters directly into the cable box via a gland3.4disconnect chambercable connection box which has an oil/oil bushing fitted between the box and the main transformertank,insuchamannerastoprevent,inserviceconditions,direct communication of oil in the main tank with the fluid in cable connection box. It is fitted with a disconnecting link3.5disconnecting linkremovable link inside a disconnect chamber which allows the transformer to be electrically isolated from the cable termination4Limits of supplyThe limits of supply of transformer and cable termination shall be according to Figure 1.5Rated valuesThe following rated values shall apply:a)highest voltage for equipment;b)rated insulation level;c)rated current;d)temperature rise;e)rated short-time and peak withstand currents;f)rated duration of short-circuit;g)cable commissioning test voltage.6Preferred values6.1Highest voltage for equipmentThe highest voltage for equipment Um of the cable connection shall be equal to the values for the cable and the transformer and shall be selected from the following preferred values:72,5 kV - 123 kV - 145 kV - 170 kV - 245 kV - 300 kV - 362 kV - 420 kV - 525 (550) kV6.2Rated currentThe rated current shall be selected from the following preferred values:400 A 1 000 A 1 600 A 2 000 A The value of 2 000 A cannot be exceeded.7Requirements7.1Temperature of connection interfaceThe current-carrying contact surfaces of the connection interface shall be either bare copper or copper silver-coated or tin-coated or silver-coated aluminium. The temperature of this interface shall not exceed the limit given in the IEC standard for the cable for which the cable connection box is designed.NOTE As the maximum conductor temperature for cables is limited by the maximum operating temperature for the insulation, there are certain cable insulations which cannot withstand the maximum temperature specified for the transformer if there is heat transfer across the connection interface of the cable termination. For cases when the temperature limit given by the IEC standard cannot be achieved, the supplier of the transformer should provide data on temperature rise of the main circuit end terminal and the insulating liquid as function of current.7.2Mechanical requirementsThe cable connection box shall be oil-tight and with the same degree of vacuum tightness as the transformer.It shall be filled with degassed oil, normally under vacuum conditions. However, if the transformer tank is not designed to withstand a vacuum, the oil filling shall be carried out under the same conditions as the main transformer tank. The oil used for filling the cable connection box shall comply with the requirements of IEC 60296 when sampled after filling and remaining in the box for a period of 20 min to 30 min.Figure 1 is a sketch of a typical arrangement of a cable termination assembly.The cable supplier provides the details inside the dotted line. The transformer supplier provides the other details. See also data list.Figure 1 and Figure 2 show the situation when the cable enters from below. The arrangement can be rotated to allow the cable to enter from above or changed to allow the cable to enter horizontally.7.3Standard dimensionsStandard dimensions for cable connection boxes, connections from the transformer in the cable connection box and cable terminations are shown in Figure 2. W ith the given five sizes, the voltage range Um from 72,5 kV to 550 kV is covered.NOTE Design limitations for extruded cables with large conductors or insulation diameters in the 1