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1、DRAFT FOR DEVELOPMENT DD ENV 50232:1997 Aeronautical ground lighting electrical installation Isolating transformer: Equipment specifications and tests ICS 93.120 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 07:10:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
2、DD ENV 50232:1997 This Draft for Development, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 September 1997 BSI 03-1999 ISBN 0 580 27798 4 National foreword This publication is not to
3、 be regarded as a British Standard. It is being issued in the Draft for Development series of publications and is of a provisional nature because it is an interim draft. A revised version of this document is being produced by IEC/TC 97. It should be applied on this provisional basis, so that informa
4、tion and experience of its practical application may be obtained. Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the European organization responsible for its conversion into a European Standard. A review of this publication will be
5、 initiated 2 years after its publication by the European organization so that a decision can be taken on its status at the end of its three-year life. The commencement of the review period will be notified by an announcement in Update Standards. According to the replies received by the end of the re
6、view period, the responsible BSI Committee will decide whether to support the conversion into a European Standard, to extend the life of the prestandard or to withdraw it. Comments should be sent in writing to the Secretary of BSI Technical Committee EPL/97, Lighting and beaconing of aerodromes, at
7、389 Chiswick High Road, London W4 4AL, giving the document reference and clause number and proposing, where possible, an appropriate revision of the text. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to inte
8、rnational publications with their corresponding European publications. The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or b
9、y using the “Find” facility of the BSI Standards Electronic Catalogue. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ENV title page, pages 2 to 12 and a back cover. This standard has been updated (see copyright date) and may have had amendments in
10、corporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 07:10:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI DD ENV 50232:1997 BS
11、I 03-1999i Contents Page National forewordInside front cover Foreword2 Text of ENV 502323 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 07:10:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank
12、University, Tue Dec 12 07:10:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN PRESTANDARD PRNORME EUROPENNE EUROPISCHE VORNORM ENV 50232 February 1997 ICS 93.120 Descriptors: Electrical installation, lighting, arodrome, transformer, specification, designation, classification, test, marking Eng
13、lish version Aeronautical ground lighting electrical installation Isolating transformer: Equipment specifications and tests This European Prestandard (ENV) was approved by CENELEC on 1996-07-02 as a prospective standard for provisional application. The period of validity of this ENV is limited initi
14、ally to three years. After two years the members of CENELEC will be requested to submit their comments, particularly on the question whether the ENV can be converted into a European Standard (EN). CENELEC members are required to announce the existence of this ENV in the same way as for an EN and to
15、make the ENV available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the ENV) until the final decision about the possible conversion of the ENV into an EN is reached. CENELEC members are the national electrotechni
16、cal committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotech
17、nique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1997 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. ENV 50232:1997 E Licensed Copy: London South Bank University, London S
18、outh Bank University, Tue Dec 12 07:10:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ENV 50232:1997 BSI 03-1999 2 Foreword This European Prestandard was prepared by the CENELEC BTTF 72-3, Lighting fittings for aerodromes. The text of the draft was submitted to the CENELEC questionnaire and vote and
19、was approved as ENV 50232 on 1996-07-02. The following date was fixed: Contents Page Foreword2 Introduction3 1Scope3 2Normative references3 3Definitions, symbols and abbreviations3 3.1Definitions3 3.2Symbols and abbreviations4 4General requirements4 4.1Isolating transformer4 4.2Connection cables4 4.
20、3Electrical characteristics5 5Type and production tests6 5.1Type tests6 5.2Requalification tests6 5.3Production tests6 6Tests description6 6.1On load current ratio6 6.2Power factor7 6.3Efficiency8 6.4Short circuit current8 6.5Off load voltage8 6.6Dielectric strength8 6.7Current leakage8 6.8Fall test
21、10 6.9Pull test10 6.10 Soaking tests10 6.11 Dimensional tests10 6.12 Ageing test10 6.13 Cycling test11 6.14 Temperature rise test11 6.15 Surge test12 Page 6.16 Gas tightness test12 7Classification and designation12 7.1Classification12 7.2Marking, labelling, packaging12 Figure 1 Intensities boundarie
22、s for isolating transformer5 Figure 2 transformer under test7 Figure 37 Figure 49 Figure 59 Figure 6 Example of set up for primary leakage test9 Figure 612 Table 14 Table 2 Limits of current measured on A410 Table 310 Table 410 Table 512 latest date by which the existence of the ENV has to be announ
23、ced at national level(doa) 1996-12-01 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 07:10:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ENV 50232:1997 BSI 03-19993 Introduction This prestandard concerns isolating transformers used in electrical series circuits
24、 for supplying ground airport lighting luminaires, installed to give pilots visual cues during approach, landing, take off and taxiing. These lights are not used to light any ground surface, but shall provide some references to pilots. This is why there is a strong link between the following require
25、ments and those issued from ICAO standards. 1 Scope This prestandard specifies the nominal characteristics of the isolating transformers used in airfield ground lighting for 6,6 A series circuits supplied by Constant Current Regulators up to 30 kW in rating. This prestandard is applicable to isolati
26、ng transformer used to supply through its secondary circuit airport lighting luminaires. The isolating transformer provides electrical insulation, between the primary circuit supplied by a constant current regulator and the secondary connected to the load (generally the lamp of the luminaire) under
27、conditions specified in this prestandard. Specific transformers used to deliver a alternative voltage or a constant current on its secondary circuit, are not included in this prestandard. The document is in accordance with ICAO Annex 14. In any case any new operational need for Air Navigation Safety
28、 could change some data or principle issued in this document. 2 Normative references This European prestandard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at appropriate places in the text and the publications are listed hereaf
29、ter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. ENV 50231, Aviation ground lighting e
30、lectrical installation Constant current regulator: Equipment specifications and tests. prENV 50233, Aviation ground lighting electrical installation Connecting devices: Equipment specifications and tests. EN 60742, Isolating transformer and safety isolating transformers Requirements (IEC 742 + A1, m
31、od.). HD 383, Conductors of insulated cables (IEC 228). ICAO, International standards and recommended practices, Aerodromes Annex 14 to the Convention on International Civil Aviation, Volume 1 and 2, Aerodrome Design and Operations (Issued by International Civil Aviation Organisation). ISO 9002, Qua
32、lity systems Model for quality assurance in design, development, production, installation and servicing. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of this prestandard the following definitions apply, as well as those given in ICAO Annex 14. 3.1.1 isolating in all this
33、 document the word “isolating” shall be interpreted as defined in EN 60742 3.1.2 type test a test for the purpose of checking compliance of the design of a given product with the requirements of the relevant specification. Type tests are selected in agreement with the manufacturer or responsible ven
34、dor 3.1.3 production test a test for the purpose of checking the compliance of a batch of series products for acceptance. This test is defined in this standard 3.1.4 rated voltage the RMS voltage at which the transformer was designed to operate under normal load conditions 3.1.5 nominal wattage the
35、wattage at which the transformer was designed to supply full resistive load under normal conditions 3.1.6 rated current the RMS current at which the transformer was designed to operate 3.1.7 rated frequency the frequency or frequency range for which the transformer has been designed Licensed Copy: L
36、ondon South Bank University, London South Bank University, Tue Dec 12 07:10:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ENV 50232:1997 4 BSI 03-1999 3.1.8 isolating transformer isolating transformers are defined in EN 60742 3.1.9 safety isolating transformer safety isolating transformers are defin
37、ed in EN 60742 3.1.10 safety Extra-Low Voltage (SELV) safety Extra low voltage is defined in EN 60742 3.2 Symbols and abbreviations 4 General requirements 4.1 Isolating transformer The rated primary current shall be 6,6 A. The transformers shall be enclosed in a permanently sealed insulating case so
38、 as to produce a completely watertight assembly. The thickness of the encapsulation shall be not less than 6,5 mm anywhere, whatever the type of encapsulation. The transformers shall have two electrically and physically separate windings, one primary and one secondary wound on a magnetic circuit. Th
39、e magnetic core shall have no connection neither to earth, nor to one of the electrical circuits. An external earthing terminal linked to a well identified pole of the secondary may be required. All internal connections shall be made by high-pressure crimping or high-temperature soldering. The nomin
40、al characteristics as the nominal values on the secondary and the nominal wattage are specified in Table 1. Table 1 The encapsulation of the transformers shall provide a continuous and watertight bond with its connection cables/connectors. The construction of the transformer shall ensure its charact
41、eristics given in 4.3 and the dielectric strength between the primary circuit on one hand and either the secondary circuit or the outside surrounding on the other hand shall be at least 12 kV RMS for 1 min. The minimum length of the creepage path between primary and secondary shall be as specified i
42、n EN 60742. 4.2 Connection cables 4.2.1 Primary cables The isolating transformer shall be connected to the airfield lighting primary series circuit cable via two flexible copper cables with at least 6 mm2 cross section, and minimum length 50 cm. The rated service voltage for the cable shall be 6 kV
43、test voltage 35 kV DC. One cable shall have a moulded on male prENV 50233 type 1, class A, style 2 connector at its end. The other cable shall have a moulded on female prENV 50233 type 1, class A, style 9 connector. 4.2.2 Secondary Connection shall be by a section of two-pole cable of section 2 4 mm
44、2 or 2 2,5 mm2, service voltage minimum 600 V and minimum length of 1,2 m. These cables shall have female prENV 50233 type 2, class A, style 7 or 8 connectors at their ends. IT:Isolating transformer used in airfield lighting. CCR:Constant Current Regulator as specified in ENV 50231. A1, A2:primary a
45、nd secondary currents measured by ammeters. V1, V2:primary and secondary voltages measured by voltmeters. W1, W2:wattage measurements of respectively primary and secondary circuit of IT. Nominal wattage W Primary current A 456,6 656,6 1006,6 1506,6 2006,6 3006,6 Licensed Copy: London South Bank Univ
46、ersity, London South Bank University, Tue Dec 12 07:10:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ENV 50232:1997 BSI 03-19995 4.2.3 Characteristics The connectors shall be protected by watertight plugs/caps. The connector encapsulation, the cables sheath and the transformer body shall be made of
47、compatible materials. No cracks shall appear at the junctions between them, when the transformer and its connectors is manufactured as a single entity. The primary and secondary cables shall be flexible, class 5 or 6 specified in HD 383. 4.3 Electrical characteristics 4.3.1 Secondary current The tol
48、erance on the secondary current for nominal loading and a rated current shall be equal to the nominal value 1 %, i.e. 6,53 A or 6,67 A. 4.3.2 Power factor At nominal resistive load and rated primary current, for all types of transformer, the power factor shall be greater than 95 %. 4.3.3 Efficiency
49、At nominal resistive load and rated primary current the efficiency of the transformer shall be at least 85 % for transformers rated below and equal to 70 W and 90 % for transformers rated above 70 W. 4.3.4 Short-circuited secondary For a rated primary current, the secondary short-circuit current shall be less than 6,90 A. 4.3.5 Off-load voltage With the secondary in open circuit, the r.m.s. voltage at its terminals shall not exceed 50 V for all type of transformers. 4.3.6 Acceptable load In order to take account of the lamp power tolerances, losses in
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