1、BRITISH STANDARDBS EN60076-11:2004Power transformers Part 11: Dry-type transformersThe European Standard EN 60076-11:2004 has the status of a British StandardICS 29.180g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g
2、53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 60076-11:2004This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 April 2006 BSI 2006ISBN 0 580 47972 2National forewordThis British Standard is the official English lang
3、uage version of EN 60076-11:2004. It is identical with IEC 60076-11:2004. It supersedes BS EN 60726:2003 which will be withdrawn on 1 July 2007. The UK participation in its preparation was entrusted to Technical Committee PEL/14, Power transformers, which has the responsibility to: A list of organiz
4、ations 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 Corresponde
5、nce 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 itse
6、lf confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promu
7、lgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 38, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicati
8、onAmd. No. Date CommentsEUROPEAN STANDARD EN 60076-11 NORME EUROPENNE EUROPISCHE NORM July 2004 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B
9、- 1050 Brussels 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60076-11:2004 E ICS 29.180 Supersedes EN 60726:2003English version Power transformers Part 11: Dry-type transformers (IEC 60076-11:2004) Transformateurs de puiss
10、ance Partie 11: Transformateurs de type sec (CEI 60076-11:2004) Leistungstransformatoren Teil 11: Trockentransformatoren (IEC 60076-11:2004) This European Standard was approved by CENELEC on 2004-07-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the
11、 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
12、 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 electro
13、technical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 6
14、0076-11:2004 2 Foreword The text of document 14/476/FDIS, future edition 1 of IEC 60076-11, prepared by IEC TC 14, Power transformers, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60076-11 on 2004-07-01. This European Standard supersedes EN 60726:2003. The followi
15、ng dates were 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) 2005-04-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2007-07-01 Annex ZA has been add
16、ed by CENELEC. _ Endorsement notice The text of the International Standard IEC 60076-11:2004 was approved by CENELEC as a European Standard without any modification. _ 3 EN 60076-11:2004 CONTENTS 1 Scope 6 2 Normative references .6 3 Terms and definitions .7 4 Service conditions 7 4.1 General .7 4.2
17、 Normal service conditions7 4.3 Electromagnetic compatibility (EMC) 8 4.4 Provision for unusual service conditions.8 4.5 Transport and storage conditions .9 5 Tappings 9 6 Connections .9 7 Ability to withstand short circuit.9 8 Rating 10 8.1 General .10 8.2 Rated power10 8.3 Preferred values of rate
18、d power .10 8.4 Operation at higher than rated voltage .10 8.5 Operation with fan cooling .10 8.6 Operation in an enclosure10 9 Rating plate11 9.1 Rating plate fitted to the transformer 11 9.2 Rating plate fitted to the transformer enclosure 11 10 Identification according to cooling method.11 10.1 I
19、dentification symbols 11 10.2 Arrangement of symbols 12 11 Temperature-rise limits .12 11.1 Normal temperature-rise limits .12 11.2 Reduced temperature rises for transformers designed for high cooling air temperatures or special air cooling conditions 13 11.3 High altitude temperature rise correctio
20、n 13 12 Insulation levels .13 12.1 General .13 12.2 Transformers for use at high altitudes 15 13 Climatic, environmental and fire behaviour classes15 13.1 Climatic classes.15 13.2 Environmental classes .15 13.3 Fire behaviour classes.15 13.4 Test criteria for climatic, environmental and fire behavio
21、ur classes .16 14 General requirements for tests16 15 Measurement of winding resistance (routine test) 16 16 Measurement of voltage ratio and check of phase displacement (routine test)17 17 Measurement of short-circuit impedance and load loss (routine test)17 18 Measurement of no-load loss and curre
22、nt (routine test) .17 19 Separate-source AC withstand voltage test (routine test).17 EN 60076-11:2004 4 20 Induced AC withstand voltage test (routine test)17 21 Lightning impulse test (type test) 18 22 Partial discharge measurement (routine and special test) 18 22.1 General .18 22.2 Basic measuring
23、circuit (typical only) .18 22.3 Calibration of the measuring circuit 18 22.4 Voltage application 19 22.5 Partial discharge acceptance levels .20 23 Temperature-rise test (type test).21 23.1 General .21 23.2 Methods of loading 21 23.3 Winding temperature-rise correction for reduced current.24 23.4 De
24、termination of steady state conditions 24 24 Measurement of sound level (special test).24 25 Short-circuit test (special test) 25 26 Environmental test (special test) .25 26.1 General .25 26.2 Validity of the test25 26.3 Testing procedure25 27 Climatic test (special test).26 27.1 Thermal shock test
25、(special test)26 27.2 Validity of the test26 27.3 Thermal shock test for C1 class transformers .27 27.4 Thermal shock test for C2 class transformers .28 28 Fire behaviour test (special test) .28 28.1 General .28 28.2 Checking of corrosive and harmful gases emission.28 28.3 Fire behaviour test for F1
26、 class transformer .29 28.4 Quantities to be measured and measuring devices .31 28.5 Calibration of the test chamber without test object31 28.6 Test method 31 28.7 Test report 32 28.8 Criteria for evaluating the test results.32 29 Tolerances .33 30 Protection against direct contact .33 31 Degrees of
27、 protection provided by enclosures .33 32 Earthing terminal 33 33 Information required with enquiry and order 33 Annex A (informative) Installation and safety of dry-type transformers.36 Annex ZA (normative) Normative references to international publications with their corresponding European publica
28、tions38 5 EN 60076-11:2004 Figure 1 Basic measuring circuit for the partial discharge test for a single-phase transformer.19 Figure 2 Basic measuring circuit for the partial discharge test for a three-phase transformer.19 Figure 3 Voltage application for routine partial discharge test20 Figure 4 Vol
29、tage application for special partial discharge test .20 Figure 5 Example of back-to- back method Single phase. 23 Figure 6 Example of back-to-back method Three-phase .23 Figure 7 Test chamber .34 Figure 8 Test chamber details 35 Table 1 Letter symbols.12 Table 2 Winding temperature-rise limits13 Tab
30、le 3 Insulation levels based on European practice.14 Table 4 Insulation levels based on North American practice14 Table 5 sequence of tests 16 Table 6 Dimensions of test chamber (see Figures 7 and 8) .30 EN 60076-11:2004 6 POWER TRANSFORMERS Part 11: Dry-type transformers 1 Scope This part of IEC 60
31、076 applies to dry-type power transformers (including auto-transformers) having values of highest voltage for equipment up to and including 36 kV and at least one winding operating at greater than 1,1 kV. The standard applies to all construction technologies. This standard does not apply to: gas-fil
32、led dry type transformers where the gas is not air; single-phase transformers rated at less than 5 kVA; polyphase transformers rated at less than 15 kVA; instrument transformers (see IEC 60044 and IEC 60186); starting transformers; testing transformers; traction transformers mounted on rolling stock
33、; flameproof and mining transformers; welding transformers; voltage regulating transformers; small power transformers in which safety is a special consideration. Where IEC standards do not exist for the transformers mentioned above or for other special transformers, this standard may be applicable a
34、s a whole or in parts. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC
35、 60050 (all parts), International electrotechnical vocabulary (IEV) IEC 60071 (all parts), Insulation co-ordination IEC 60076-1:1993, Power transformers Part 1: General Amendment 1 (1999) IEC 60076-2, Power transformers Part 2: Temperature rise IEC 60076-3, Power transformers Part 3: Insulation leve
36、ls, dielectric tests and external clearances in air 7 EN 60076-11:2004 IEC 60076-5, Power transformers Part 5: Ability to withstand short-circuit IEC 60076-10, Power transformers Part 10: Determination of sound levels IEC 60085, Thermal evaluation and classification of electrical insulation IEC 6027
37、0, High-voltage test techniques Partial discharge measurements IEC 60332-3-10, Tests on electric cables under fire conditions Part 3-10: Test for vertical flame spread of vertically-mounted bunched wires or cables Apparatus IEC 60529, Degrees of protection provided by enclosures (IP Code) IEC 60905:
38、1987, Loading guide for dry-type power transformers IEC 61330, High-voltage/low voltage prefabricated substations 3 Terms and definitions For the purpose of this part of IEC 60076, the following terms and definitions apply. 3.1 dry-type transformer transformer of which the magnetic circuit and windi
39、ngs are not immersed in an insulating liquid 3.2 totally enclosed dry-type transformer transformer in an un-pressurised enclosure cooled by the circulation of the internal air 3.3 enclosed dry-type transformer transformer in a ventilated enclosure cooled by the circulation of the external air 3.4 no
40、n-enclosed dry-type transformer transformer supplied without a protective enclosure cooled by natural or forced air ventilation 4 Service conditions 4.1 General The requirements of IEC 60076-1 apply to dry-type transformers only in so far as they are referred to in this standard. 4.2 Normal service
41、conditions 4.2.1 General Unless otherwise stated, the service conditions in 4.2.2 to 4.2.6 apply. When transformers are required to operate outside the normal service conditions, de-rating in accordance with 11.2 and/or 11.3 applies. EN 60076-11:2004 8 4.2.2 Altitude A height above sea level not exc
42、eeding 1 000 m. 4.2.3 Temperature of cooling air The temperature of cooling air not exceeding: 40 C at any time; 30 C monthly average of the hottest month; 20 C yearly average. and not below: 25 C in the case of outdoor transformers; 5 C in the case of indoor transformers. where the monthly and year
43、ly averages are as defined in 3.12 of IEC 60076-1. 4.2.4 Wave-shape of supply voltage A supply voltage of which the waveshape is approximately sinusoidal. NOTE This requirement is normally not critical in public supply systems but may have to be considered in installations with considerable converte
44、r loading. In such cases, there is a conventional rule that the deformation shall neither exceed 5 % total harmonic content nor 1 % even harmonic content, see IEC 61000-2-4. Also note the importance of current harmonics for load loss and temperature rise, see IEC 61378-1. 4.2.5 Symmetry of polyphase
45、 supply voltages For three-phase transformers, a set of three-phase supply voltages which are approximately symmetrical. 4.2.6 Humidity The relative humidity of the surrounding air shall be less than 93 %. No drops of water shall be present on the surface of the coils. 4.3 Electromagnetic compatibil
46、ity (EMC) Transformers shall be considered as passive elements in respect to emission and immunity to electromagnetic disturbances. 4.4 Provision for unusual service conditions The purchaser shall identify in his enquiry any service conditions not covered by the normal service conditions in 4.2. Exa
47、mples of such conditions are: high or low ambient temperature outside the limits prescribed in 4.2.3; restricted ventilation; altitude in excess of the limit prescribed in 4.2.2; damaging fumes and vapours; steam; humidity in excess of the limit prescribed in 4.2.6; dripping water; salt spray; 9 EN
48、60076-11:2004 excessive and abrasive dust; high harmonic content of the load current; distortion of the supply voltage waveform; fast transient overvoltages over the limits prescribed in 12.1 and Clause 21; associated power factor correction and method of capacitor switching to limit inrush current;
49、 superimposed DC current; seismic qualification which would otherwise require special considerations in the design; extreme mechanical shock and vibrations; transport and storage conditions not covered by the normal condition described in 4.5. Transformer specification for operation under such abnormal conditions shall be subject to agreement between the supplier and purchaser. Supplementary requirements, within def
