1、Medium power transformers 50 Hz, with highest voltage for equipment not exceeding 36 kVPart 1: General requirementsBS EN 505881:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50588-1 September 2017 ICS 29.180
2、Supersedes EN 50588-1:2015English Version Medium power transformers 50 Hz, with highest voltage for equipment not exceeding 36 kV - Part 1: General requirementsTransformateurs 50 Hz de moyenne puissance, de tension la plus leve pour le matriel ne dpassant pas 36 kV - Partie 1: Exigences gnrales Mitt
3、elleistungstransformatoren 50 Hz, mit einer hchsten Spannung fr Betriebsmittel nicht ber 36 kV - Teil 1: Allgemeine Anforderungen This European Standard was approved by CENELEC on 2017-07-03. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions
4、 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 CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists i
5、n 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 CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national
6、 electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portuga
7、l, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17,
8、 B-1000 Brussels 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50588-1:2017 ENational forewordThis British Standard is the UK implementation of EN 505881:2017. It supersedes BS EN 505881:2015+A1:2016, which is withdrawn.The U
9、K participation in its preparation was entrusted 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 resp
10、onsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 97927 9ICS 29.180Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards
11、 Policy and Strategy Committee on 30 September 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 505881:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50588-1 September 2017 ICS 29.180 Supersedes EN 50588-1:2015English Version Medium power transform
12、ers 50 Hz, with highest voltage for equipment not exceeding 36 kV - Part 1: General requirementsTransformateurs 50 Hz de moyenne puissance, de tension la plus leve pour le matriel ne dpassant pas 36 kV - Partie 1: Exigences gnrales Mittelleistungstransformatoren 50 Hz, mit einer hchsten Spannung fr
13、Betriebsmittel nicht ber 36 kV - Teil 1: Allgemeine Anforderungen This European Standard was approved by CENELEC on 2017-07-03. 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 stan
14、dard without any alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version i
15、n any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croa
16、tia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerla
17、nd, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CENELEC All rights of exploitation in any
18、form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50588-1:2017 EBS EN 505881:2017EN 50588-1:2017 (E) 2 Contents Page European foreword . 3 1 Scope 4 2 Normative references . 5 3 Terms and definitions 6 4 Environmental classes . 8 5 Electrical characteristics . 8 5.1 Highest v
19、oltages for equipment for winding with Um 1,1 kV 8 5.2 Rated voltage for winding with Um 1,1 kV 8 5.3 Tapping 9 5.4 Connection designations for three phase transformers . 9 6 Load loss, no load loss, PEI, sound power level, short-circuit impedance . 9 6.1 General 9 6.2 Transformers with rated power
20、Sr 3 150 kVA 10 6.3 Transformers with rated power 3 150 kVA 1,1 kV Insulation levels and dielectric test shall be in accordance with the requirements of EN 60076-3 and for dry type transformers in accordance with EN 60076-11. The values of the highest voltage Um for equipment are: 3,6 kV 7,2 kV 12 k
21、V 17,5 kV 24 kV 36 kV NOTE National practices may require the use of highest voltages for equipment up to (but not including) 52 kV, when the rated voltage is less than 36 kV (such as Um = 38,5 kV or Um = 40,5 kV). 5.2 Rated voltage for winding with Um 1,1 kV For Um 1,1 kV, the preferred rated volta
22、ge value shall be chosen in the hereunder list: 400 V 410 V 415 V 420 V 433 V 690 V This document may be applied either as a whole or in part, to transformers with rated low voltages below 400 V and above 690 V. The values for short duration power frequency withstand and/or for the lightning impulse
23、 withstand test between windings and earth need to be stated by the purchaser. Typical values are respectively 10 kV and 30 kV. BS EN 505881:2017EN 50588-1:2017 (E) 9 5.3 Tapping Taps can be provided with DETC or OLTC devices: DETC: De-energized tap changer; OLTC: On load tap changer. For DETC, the
24、preferred tapping ranges are 2,5 % with 3 tap positions and 2 x 2,5 % with 5 tap positions. On special request 4 x 2,5 % with 9 tap positions can be provided. Tapping ranges greater than 10 % or with more than 9 tap positions are unusual and subject to specific agreement. For transformer equipped wi
25、th OLTC, the tapping range shall be smaller than 15 % with a maximum of 17 tap positions. Tapping ranges greater than 15 % or with more than 17 tap positions are unusual and subject to specific agreement. Tapping ranges outside the above definitions have to be specified by agreement between manufact
26、urer and purchaser. 5.4 Connection designations for three phase transformers Preferred connection designations, following IEV 421-10-09, shall be in accordance with the provisions of Table 1. Table 1 Connections Sr 100 kVA 100 kVA 3 150 kVA and Sr 1,1 kV The maximum levels of losses indicated in Tab
27、le 2, Table 3 and Table 4 can be increased by 20 % for no load loss and by 15 % for load loss and short circuit impedance unless otherwise specified should be increased by adding a value of 0,5 %. 6.2.4 Load loss and no load loss in case of dual voltage The level of losses given in 6.2.2 shall be we
28、ighted by the correction factors given in Table 6 below, in order to take care of variations related to dual voltage windings. Table 6 Correction of load loss and no load loss in case of dual voltage Ref Dual voltage Correction of load loss and no load loss A One winding In case of transformers with
29、 one high-voltage winding and two voltages available from tapped low-voltage winding, losses shall be calculated based on the higher low-voltage and shall comply with the levels indicated in Table 2, Table 3 and Table 4. The maximum available power on the lower low-voltage on such transformers shall
30、 be no more than 0,85 times its rated power. In case of transformers with one high-voltage winding with two voltages available from a tap, the maximum available power on the lower high-voltage on such transformer shall be limited to 0,85 of its nominal rated power. In the case where the full rated p
31、ower is available regardless of the combination of voltages, the levels of losses indicated in Table 2, Table 3 and Table 4 can be increased by 15 % for no load loss and by 10 % for load loss. Such levels of losses shall refer to the highest voltage. B Both windings The maximum allowable losses indi
32、cated in Table 2, Table 3 and Table 4 can be increased by 20 % for no load losses and by 20 % for load losses for transformers with dual voltage on both windings if the rated power is the same regardless of the combination of voltages. The level of losses shall refer to the highest voltages of both
33、windings. This remains valid even if further voltage combinations are available. BS EN 505881:2017EN 50588-1:2017 (E) 14 For transformers having dual voltage on both windings for which both voltages on one winding are fully rated in combination with one of the voltages on the other winding, the leve
34、ls of losses shall be based on the highest power and the values indicated in Table 2, Table 3 and Table 4 can be increased by 15 % for no load losses and by 10 % for load losses. The level of losses shall refer to the highest voltages of both windings. This remains valid even if further voltage comb
35、inations are available. For transformer having insulation level according to Table 5 and having dual voltage according to Table 6 the loss level shall take into account both corrections. 6.2.5 Three winding transformers for PV applications Dual voltage correction factors given in Table 6, Ref A, app
36、ly also to transformers for photovoltaic applications, which have two low voltage windings that each have half the rated power of the high voltage winding. 6.3 Transformers with rated power 3 150 kVA 3 150 kVA. Table 7 Minimum Peak Efficiency Index (PEI) for Liquid immersed transformers RATED POWER
37、(kVA) PEI (%) A AA 3 150 3 150 kVA. kPEI, the load factor at which PEI occurs for transformers with Sr 3 150 kVA. For dual voltage transformers, the maximum rated power at the lower voltage. BS EN 505881:2017EN 50588-1:2017 (E) 20 Conductor mass and the nature of the conductor. Core mass and the nat
38、ure of the core material. For medium power pole mounted transformers, a visible display “For pole-mounted operation only”. In case correction factors apply on losses because of other insulation level or dual voltage as specified in subclauses 6.2.3 and 6.2.4, the loss class names to be written on th
39、e rating plate and in the technical documentation (e.g. A0, AA0, AAA0, Ak, Bk, Ck, ) shall remain the same, without mentioning the correction factors. In case of dual voltage transformers for which the full rated power is available regardless of the combination of voltages, the no load and load loss
40、 to be written on the rating plate and in the technical documentation shall refer to the highest voltage of the tapped winding. 9 Tests 9.1 Routine tests EN 60076-1 and EN 60076-11 apply unless otherwise stated in this standard. The test report of the transformers shall report the PEI value and the
41、corresponding kPEI for transformers with Sr 3 150 kVA. For transformers with Sr 3 150 kVA the test report shall include the measured value of no load loss and load loss. 9.2 Type tests EN 60076-1 and EN 60076-11 apply unless otherwise stated in this standard. 9.3 Special tests EN 60076-1 and EN 6007
42、6-11 apply unless otherwise stated in this standard. 9.4 Special test for corrugated tank 9.4.1 General information For liquid immersed transformers with corrugated tank a special test to check the reliability of the tank along the life is described here after. 9.4.2 Temperature variation For the si
43、mulation of the seasonal and daily temperature variations, the average liquid temperature is assumed to vary between -25 C (minimum ambient temperature with disconnected transformer) and +88 C (the sum of maximum ambient temperature +40 C and maximum allowed average oil temperature rise: 0,8 x 60 K
44、= 48 K). By agreement between manufacturer and purchaser the maximum temperature used for the endurance test shall be 40 C plus 0,8 times the liquid temperature rise determined by the temperature rise test as prescribed by EN 50464-4. 9.4.3 Sealing temperature When sealing the tank, the average liqu
45、id temperature shall be chosen between 15 C and 35 C and recorded. A manometer connected to the tank cover shall register the value zero. 9.4.4 Calculation of the volume variation From the temperature variations above, the liquid volume change from the relaxed stage at the sealing temperature shall
46、be calculated using a volume expansion coefficient given by suppliers and generally equal to 7,5 10-4(+/- 10 %) K-1for mineral oil. BS EN 505881:2017EN 50588-1:2017 (E) 21 The following value may be taken for other liquids if no information is given by suppliers: Silicone 10 10-4K-1 Natural ester 7,
47、4 10-4K-1 Synthetic ester 7,5 10-4K-19.4.5 Test procedure 9.4.5.1 General These tests are considered as special tests. These tests shall be carried out on a tank which is considered as representative of a range of tanks by agreement between purchaser and supplier. 9.4.5.2 Measurement of pressure ran
48、ge The increase or decrease of the liquid volume as calculated in paragraph above shall be added to or extracted from the relaxed tank, and the corresponding overpressure (P+) and underpressure (P-) shall be registered by a manometer connected to the tank cover. The liquid temperature during the mea
49、surement shall be the same value as used for sealing 3 C as described in the paragraph above 9.4.5.3 Endurance test To simulate the volume expansion, the tank shall be subjected to 2 000 cycles with overpressure and underpressure. Each cycle comprises one overpressure and one underpressure. To achieve the overpressure and underpressure, the volume of liquid calculated in paragraph above shall be added to and extracted from the tank in the quantity calculated in paragr
