1、BRITISH STANDARDBS EN 50464-3:2007Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV Part 3: Determination of the power rating of a transformer loaded with non-sinusoidal currentsThe European Standard EN 50464-3:2
2、007 has the status of a British StandardICS 29.180g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 50464-3:2007This British Standard was publis
3、hed under the authority of the Standards Policy and Strategy Committee on 31 August 2007 BSI 2007ISBN 978 0 580 57702 4National forewordThis British Standard is the UK implementation of EN 50464-3:2007. It supersedes BS 7821-4:1995 which is withdrawn.The UK participation in its preparation was entru
4、sted to Technical Committee PEL/14, Power transformers.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Complian
5、ce with a British Standard cannot confer immunity from legal obligations. Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 50464-3NORME EUROPENNE EUROPISCHE NORM April 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Ele
6、ctrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50464-3:2007 E ICS 29.180 Supersedes HD 428.4 S1:1994En
7、glish version Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV - Part 3: Determination of the power rating of a transformer loaded with non-sinusoidal currents Transformateurs triphass de distribution immergs da
8、ns lhuile, 50 Hz, de 50 kVA 2 500 kVA, de tension la plus leve pour le matriel ne dpassant pas 36 kV - Partie 3: Dtermination de la caractristique de puissance dun transformateur avec des courants de charge non sinusodaux lgefllte Drehstrom-Verteilungstransformatoren 50 Hz, 50 kVA bis 2 500 kVA, mit
9、 einer hchsten Spannung fr Betriebsmittel bis 36 kV - Teil 3: Bestimmung der Bemessungsleistung eines Transformators bei nichtsinusfrmigen Laststrmen This European Standard was approved by CENELEC on 2007-02-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stip
10、ulate 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 Standa
11、rd 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 nationa
12、l electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden,
13、Switzerland and the United Kingdom. EN 50464-3:2007 - 2 -Foreword The text of the Harmonization Document HD 428.4 S1:1994, prepared by the Technical Committee CENELEC TC 14, Power transformers, was submitted to the formal vote for conversion into a European Standard and was approved by CENELEC as EN
14、 50464-3 on 2007-02-01. The following date was fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2008-02-01 The EN 50464 series consists of the following parts, under the general title “Three-phase oil-
15、immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV” : Part 1 General requirements Part 2-1 Distribution transformers with cable boxes on the high-voltage and/or low-voltage side General requirements Part 2-2 Distribution transfor
16、mers with cable boxes on the high-voltage and/or low-voltage side Cable boxes type 1 for use on distribution transformers meeting the requirements of EN 50464-2-1 Part 2-3 Distribution transformers with cable boxes on the high-voltage and/or low-voltage side Cable boxes type 2 for use on distributio
17、n transformers meeting the requirements of EN 50464-2-1 Part 3 Determination of the power rating of a transformer loaded with non-sinusoidal currents Part 4 Requirements and tests concerning pressurised corrugated tanks EN 50464-3:2007 - 3 -Contents 1 Scope4 2 Normative references4 3 Application.4 4
18、 Equivalent power rating.4 5 Calculation of the factor K to obtain the equivalent power rating 5 EN 50464-3:2007 - 4 -1 Scope This European Standard gives to the user guidance to determine the loadability of an oil-immersed distribution transformer, as defined in and covered by EN 50464-1, in the ca
19、se of load current with harmonic factors exceeding the maximum values allowed. NOTE In general this document is also applicable to dry-type distribution transformers as defined in and covered by HD 538. 2 Normative references For the purposes of this document, the normative references of EN 50464-1
20、apply. 3 Application For normal electrical energy distribution, the allowable total harmonic factor 1)and even harmonic factor of the load current are assumed to be limited to 5 % and 1 % respectively. For electrical distribution with higher harmonic factors, it has to be taken into account that the
21、 load loss increases and, by consequence, the temperature rises in the transformer exceed those corresponding to sinusoidal currents having the same r.m.s. value. NOTE If the transformer is intended for converter operation or the harmonic factor is higher than 5%, the matter shall be discussed betwe
22、en purchaser and manufacturer. 4 Equivalent power rating The equivalent power rating is related to sinusoidal current which causes the same losses as those occurring with the non-sinusoidal current imposed. The equivalent power rating is equal to the power based on the r.m.s. value of the non-sinuso
23、idal current multiplied by the factor K. The rated power of the transformer to be used shall be equal to or higher than the equivalent power rating. In case a transformer in service is subsequently loaded with harmonic currents, a derating factor 1/K shall be applied to the rated power. 1)The harmon
24、ic factor H, in percentage, is defined by: 21221100%=NnnnIIH EN 50464-3:2007 - 5 -5 Calculation of the factor K to obtain the equivalent power rating The factor K is given by the following formula 2): 2122 12111+=NnnnqIInIIeeKwhere e = the eddy current loss due to sinusoidal current at fundamental f
25、requency (e.g. 50 Hz), divided by the loss due to a d.c. current equal to the r.m.s. value of the sinusoidal current, both at reference temperature; n = harmonic order; I = the r.m.s. value of the sinusoidal current and, in the other case, of non-sinusoidal current, containing all harmonics, given b
26、y 2121112112=NnnnNnnnIIIIIIn = the nth harmonic current (amplitude or r.m.s. value); I1 = the fundamental current (amplitude or r.m.s. value); q = an exponential constant 3). 2)In the formula it is assumed that both power ratings are based on the same r.m.s. value of the load current. 3)The exponent
27、 q is dependent on the type of windings and on the frequency. However as an approximation and as a guidance, the following constant values may be used: 1,7 for transformers with round or rectangular wire in both the low and high voltage windings; 1,5 for transformers having low voltage foil windings
28、. Other values, based on measurements and possibly frequency dependent, may be applied by agreement between purchaser and manufacturer. BS EN 50464-3:2007BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Stand
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