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1、BRITISH STANDARD BS EN 50482:2008 Instrument transformers Three-phase inductive voltage transformers having Um up to 52 kV ICS 17.220.20 ? Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:03
2、:43 MDTNo reproduction or networking permitted without license from IHS -,-,- BS EN 50482:2008 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 May 2008 BSI 2008 ISBN 978 0 580 56558 8 National foreword This British Standard is the UK imple
3、mentation of EN 50482:2008. It supersedes BS 7729:1994 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PEL/38, Instrument transformers. A list of organizations represented on this committee can be obtained on request to its secretary. This publication
4、 does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication DateComments Copyright British Standards Instit
5、ution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:03:43 MDTNo reproduction or networking permitted without license from IHS -,-,- EUROPEAN STANDARD EN 50482 NORME EUROPENNE EUROPISCHE NORM January 2008 CENELEC European Commit
6、tee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC m
7、embers. Ref. No. EN 50482:2008 E ICS 17.220.20 Supersedes HD 587 S1:1993 English version Instrument transformers - Three-phase inductive voltage transformers having Um up to 52 kV Transformateurs de mesure - Transformateurs inductifs de tension triphass avec Um jusqu 52 kV Messwandler - Dreiphasige
8、Spannungswandler mit Um bis 52 kV This European Standard was approved by CENELEC on 2007-09-01. 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-
9、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
10、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, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland,
11、France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Copyright British Standards Institution Provided by IHS under license with BSI -
12、 Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:03:43 MDTNo reproduction or networking permitted without license from IHS -,-,- EN 50482:2008 2 Foreword This European Standard was prepared by the Technical Committee CENELEC TC 38X, Instrument transformers. The text of
13、the draft was submitted to the formal vote and was approved by CENELEC as EN 50482 on 2007-09-01. This European Standard supersedes HD 587 S1:1993. It is to be used in conjunction with EN 60044-2:1999. The following dates were fixed: latest date by which the EN has to be implemented at national leve
14、l by publication of an identical national standard or by endorsement (dop) 2008-09-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-09-01 _ BS EN 50482:2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontro
15、lled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:03:43 MDTNo reproduction or networking permitted without license from IHS -,-,- 3 EN 50482:2008 Contents 1 General. 5 1.1 Scope 5 1.2 Normative references 5 2 Definitions. 5 3 General requirements 5 4 Normal and special service co
16、nditions. 5 5 Ratings 5 5.1 Standard values of rated voltages 5 5.2 Standard values of rated output. 6 5.3 Standard values of rated voltage factor 6 5.4 Limits of temperature rise 6 6 Design requirements. 7 6.1 Insulation requirements . 7 6.2 Short-circuit withstand capability 8 7 Classification of
17、tests. 8 8 Type tests. 8 8.1 Temperature-rise tests. 8 8.2 Short-circuit withstand capability test . 8 8.3 Impulse test on primary winding. 8 8.4 Wet test for outdoor type transformers. 9 9 Routine tests. 9 9.1 Verification of terminal markings 9 9.2 Power frequency tests on primary winding and part
18、ial discharge measurement 9 9.3 Power-frequency tests between section and on secondary windings 11 10 Special test . 11 11 Markings. 11 11.1 Rating plate and markings. 11 11.2 Terminal markings. 11 12 Accuracy requirements for three-phase inductive measuring voltage transformers. 12 12.1 Accuracy cl
19、ass designation for measuring voltage transformers. 12 12.2 Limits of voltage error and phase displacement for measuring voltage transformers. 12 12.3 Type test for accuracy of measuring voltage transformers 12 12.4 Routine test for accuracy of measuring voltage transformers . 12 12.5 Markings of th
20、e rating plate of three-phase measuring voltage transformer 12 13 Additional requirements for three-phase inductive protective voltage transformers. 12 13.1 Accuracy class designation for protective voltage transformers 12 13.2 Limits of voltage error and phase displacement for protective voltage tr
21、ansformers 12 13.3 Rated voltages for secondary windings intended to produce a residual voltage 12 13.4 Output for secondary windings intended to produce a residual voltage. 12 13.5 Accuracy class for secondary windings intended to produce a residual voltage 13 13.6 Type test for protective voltage
22、transformers 13 13.7 Routine test for protective transformers . 14 13.8 Markings of the rating plate of a three-phase protective voltage transformer 14 Bibliography. 21 BS EN 50482:2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing
23、 Co/5910770001 Not for Resale, 08/14/2008 21:03:43 MDTNo reproduction or networking permitted without license from IHS -,-,- EN 50482:2008 4 Figures Figure 1 Three-phase transformer with a single secondary 15 Figure 2 Three-phase transformer with two secondaries 15 Figure 3 Three-phase transformer w
24、ith one multi-tap secondary 16 Figure 4 Three-phase transformer with one residual voltage winding. 16 Figure 5 Circuit for accuracy test on a voltage transformer having a rated voltage factor of 1,5 17 Figure 6 Circuit for accuracy test on a voltage transformer having a rated voltage factor of 1,9 1
25、7 Figure 7 Circuit for accuracy test on the residual voltage winding of a voltage transformer having a rated voltage factor not exceeding 1,5 18 Figure 8 Circuit for accuracy test on the residual voltage winding of a voltage transformer having a rated voltage factor not exceeding 1,9 18 Figure 9 Alt
26、ernative circuit for accuracy test on the residual voltage winding of a voltage transformer having a rated voltage factor of 1,9. 19 Figure 10 Test circuit for partial discharge measurement of a three-phase earthed voltage transformer 19 Figure 11 Test circuit for partial discharge measurement of a
27、three-phase unearthed voltage transformer 20 Figure 12 Example of a calibration circuit used during the measurement of partial discharge of a three-phase voltage transformer . 20 Table Table 1 Permissible partial discharge levels for various neutral earthing system and test voltages 7 BS EN 50482:20
28、08 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:03:43 MDTNo reproduction or networking permitted without license from IHS -,-,- 5 EN 50482:2008 1 General 1.1 Scope This European Standard
29、 specifies the requirements and tests for new three-phase voltage transformers with Um up to 52 kV and frequencies from 15 Hz to 100 Hz, for use with electrical instruments or electrical protective devices. NOTE Single-phase voltage transformers connected in a three-phase bank are not covered in thi
30、s document. 1.2 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. EN 60044-2:1
31、999, Instrument transformers Part 2: Inductive voltage transformers (IEC 60044-2:1997, mod.) EN 60270:2001, High-voltage test techniques Partial discharge measurements (IEC 60270:2000) HD 588.1 S1:1991, High-voltage test techniques Part 1: General definitions and test requirements (IEC 60060-1:1989
32、+ corr. March 1990) 2 Definitions Clause 2 of EN 60044-2:1999 is applicable with the following additions: 2.3 Additional definitions for three-phase inductive voltage transformers 2.3.1 three-phase voltage transformer a voltage transformer which has three line-to-neutral primary windings the neutral
33、 point of which can be earthed or unearthed and in which one or more of the three line-to-neutral secondary windings can be connected for three-phase operation or residual voltage operation 2.3.2 rated output of a three-phase voltage transformer the per phase value of the apparent power (in volt-amp
34、eres at a specified power factor) that a three-phase voltage transformer is intended to supply to the secondary circuit, at the rated secondary voltage and with rated per-phase burden connected to it 3 General requirements Clause 3 of EN 60044-2:1999 applies. 4 Normal and special service conditions
35、Clause 4 of EN 60044-2:1999 applies. 5 Ratings 5.1 Standard values of rated voltages 5.1.1 Rated primary voltages The standard values of rated line-to-line primary voltage of three-phase voltage transformer shall be one of the values of nominal system voltage designated by EN 60044-2:1999. NOTE The
36、performance of a voltage transformer as a measuring or protection transformer is based on the rated primary voltage, whereas the rated insulation level is based on one value of the highest voltages for equipment of EN 60071. BS EN 50482:2008 Copyright British Standards Institution Provided by IHS un
37、der license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:03:43 MDTNo reproduction or networking permitted without license from IHS -,-,- EN 50482:2008 6 5.1.2 Rated secondary voltages The rated line-to-line secondary voltage shall be chosen according to pr
38、actice at the location where the transformer is to be used. The values given below are considered standard values for three-phase voltage transformers: 100 V and 110 V; 200 V, for extended secondary circuits. NOTE Whenever possible, the rated transformation ratio should be a simple value. If one of
39、the following values: 10 12 15 20 25 30 40 50 60 80 and their decimal multiples is used for the rated transformation ratio together with one of the rated secondary voltages of this subclause, the majority of the standard values of nominal system voltage of IEC 60038 will be covered. 5.1.3 Rated seco
40、ndary voltages for residual windings The rated secondary voltages of windings intended to be connected in broken-delta with similar windings to produce a residual voltage are given in 13.3. 5.2 Standard values of rated output The standard values of rated output per phase at a power factor of 0,8 lag
41、ging, expressed in volt-amperes, are: 10 15 25 30 50 75 100 150 200 VA The underlined values are preferred values. NOTE For a given transformer, provided one of the values of rated output is standard and associated with a standard accuracy class, the declaration of other rated outputs, which may be
42、non-standard values but associated with other standard accuracy classes, is not precluded. 5.3 Standard values of rated voltage factor Subclause 5.3 of EN 60044-2:1999 applies. 5.4 Limits of temperature rise Unless otherwise specified below the temperature rise of a voltage transformer at the specif
43、ied voltage, at the rated frequency and at the rated burden or at the highest burden, if there are several rated burden, at any power factor between 0,8 lagging and unity, shall not exceed the appropriate value given in Table 3 of EN 60044-2:1999. a) All three-phase transformers, irrespective of vol
44、tage factor (VF) and time rating, shall be capable of operating continuously with a balanced three-phase voltage of 1,2 times rated primary voltage. The steady state temperature rise shall not exceed the limits given in Table 3 of EN 60044-2:1999. b) Three-phase earthed transformers having a voltage
45、 factor of 1,5 for 30 s or 1,9 for 30 s shall after the application of 1,2 times rated primary voltages for sufficient time to reach stable thermal conditions, be capable of operating with a balanced three-phase voltage of respectively 0,866 or 1,1 times the rated primary voltage applied for 30 s, o
46、ne line terminal of the primary winding being connected to the neutral of that winding. The temperature rise shall not exceed by more than 10 K the value specified in Table 3 of EN 60044-2:1999. c) Three-phase earthed transformers having a voltage factor of 1,9 for 8 h shall after the application of
47、 1,2 times rated primary voltage for sufficient time to reach stable thermal conditions, be capable of operating with a balanced three-phase voltage of 1,1 times rated line-to-line voltage applied for 8 h, one line terminal of the primary winding being connected to the neutral point of the winding.
48、The temperature rise shall not exceed by more than 10 K the value specified in Table 3 of EN 60044-2:1999. Table 3 of EN 60044-2:1999 as well as the text and the notes, except a), b), and c) above apply. BS EN 50482:2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 21:03:43 M