1、BRITISH STANDARD AEROSPACE SERIES BS G243:1990 Specification for Igniter cables for engine use (4kV d.c.)BSG243:1990 This BritishStandard having beenprepared under the directionof theAerospace Standards Policy Committee (ACE/-) was published undertheauthority of the BoardofBSIand comes into effect o
2、n 31August1990 BSI01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/6 Draft for comment88/71918DC ISBN 0 580 18036 0 Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Aerospace Standards Commit
3、tee (ACE/-) to Technical Committee ACE/6, upon which the following bodies were represented: BEAMA Ltd. British Cable Makers Confederation British Rubber Manufacturers Association Civil Aviation Authority Electronic Components Industry Federation Ministry of Defence National Supervising Inspectorate
4、Society of British Aerospace Companies Limited Amendments issued since publication Amd. No. Date of issue CommentsBSG243:1990 BSI 01-2000 i Contents Page Committees responsible Insidefrontcover Foreword ii 1 Scope 1 2 Construction 1 3 Designation and marking 1 4 Packaging and labelling 1 5 Performan
5、ce 1 6 Testing 1 Appendix A Hot dielectric test 6 Appendix B Thermal shock test 6 Figure 1 Cable 1 Table 1 Cable properties 2 Table 2 Cable test requirements 2 Table 3 Test application 4 Publications referred to Inside back coverBSG243:1990 ii BSI 01-2000 Foreword This BritishStandard, which has bee
6、n prepared under the direction of the Aerospace Standards Policy Committee, specifies requirements for a range of aircraft engine ignition cables that are suitable for use on high energy ignition circuits working at voltages of not more than4kV d.c. It is intended to be read in conjunction with BS G
7、 230 “General requirements for aircraft electrical cables (second series)” which specifies the general requirements and test methods for this range of cables. The standard requires the selection of the dielectric material so as to provide the minimum penalties of weight and space whilst offering rel
8、iable performance, and the dielectric insulation material should be suitable for printed identity marking methods. Cables manufactured to this standard are not required to meet BS3G 100, subsection3-13, Resistance to fire in designated fire zones. Care should be taken to select terminations which ha
9、ve been declared as suitable for use with the cable specified in this BritishStandard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of i
10、tself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be ind
11、icated in the amendment table on the inside front cover.BSG243:1990 BSI 01-2000 1 1 Scope This BritishStandard specifies the physical properties and performance requirements for high energy igniter cables of sizes030 and050 which are suitable for working at voltages of not more than4kV d.c. The cabl
12、es are suitable for continuous use where the maximum stabilized conductor temperature does not exceed260 C, and for applications involving flexing at temperatures down to65 C. NOTE 1The latest revision of an Aerospace standard is indicated by the prefix number. NOTE 2The titles of the publications r
13、eferred to in this standard are listed on the inside back page. 2 Construction 2.1 General The materials and method of construction used for the formation of the cables shall be defined and controlled to the satisfaction of the Approving Authority 1) . No change shall be made to such materials or pr
14、ocesses unless it can be shown to the satisfaction of the Approving Authority that the performance and handling properties of the cable have not been degraded. 2.2 Conductors 2.2.1 Conductors used in the manufacture of this cable shall comply with BS G 231. 2.2.2 Copper strands shall be nickel-plate
15、d (seeFigure 1). 2.3 Insulation 2.3.1 The insulation shall consist of two or more contrawrapped lapped layers of polytetrafluoroethylene (PTFE) tape sintered into an homogeneous mass (seeFigure 1). 2.3.2 The insulation shall not be loose on the conductor but it shall be possible to strip the insulat
16、ion from the conductor leaving the latter in a sufficiently clean condition to permit satisfactory connections to be made to terminations. 2.4 Properties Cable properties shall be in accordance with Table 1. 2.5 Colour The colour of the finished cable shall be white. 3 Designation and marking The de
17、signation and marking of the cable shall comply with clause4 of BSG 230:1984. 4 Packaging and labelling The packaging and labelling of cable shall comply with clause5 of BSG 230:1984. 5 Performance When tested in accordance with6.1 the cable shall comply with the specific requirements given in Table
18、 2. 6 Testing 6.1 Cable shall be tested in accordance with Table 2. Test methods shall comply with BS G 230. 6.2 The application of tests for qualification approval, production quality testing, inspection lot testing and production routine testing shall be in accordance with Table 3. Test methods sh
19、all comply with BS G 230. 1) The Approving Authority shall be either: a) for UK civil aviation products, the Civil Aviation Authority (or their accredited representative); or b) for UK military products, the Quality Assurance Directorate nominated in the relevant Ministry of Defence contract. Figure
20、 1 CableBSG243:1990 2 BSI 01-2000 Table 1 Cable properties Table 2 Cable test requirements Cable designation Size code Conductor (nominal) Maximum resistance Minimum insulation thickness Cable diameter Maximum mass per unit length Area No. of wires Wire diameter Conductor diameter maximum minimum BS
21、 G 243 030 mm 22.98 37 mm 0.32 mm 2.24 Ohms/Km 6.44 mm 0.725 mm 3.94 mm 3.69 g/m 45.2 BS G 243 050 4.65 37 0.4 2.8 4.08 0.9 4.8 4.6 68.6 BS G 230Test No. Purpose of test Specific requirements of this standard 1 Appearance and identification of finished cable As BSG 230 2 Mass per unit length of fini
22、shed cable Maximum values shall be in accordance with Table 1 of this standard 3 Conductor composition As BSG 230 4 Visual examination of strands As BSG 230 5 Insulation thickness and concentricity Minimum values shall be in accordance with Table 1 of this standard 6 Core and cable outer diameters D
23、imensions shall be in accordance with Table 1 of this standard 7 Tensile strength and elongation at break of copper or copper alloy conductors Tensile strength shall be220N/mm 2(minimum)300N/mm 2(maximum) Elongation shall be10%(minimum). 9 Strand plating continuity As BSG 230 10 Strand plating adher
24、ence As BSG 230 11 Strand plating thickness As BSG 230 12 Electrical resistance of copper or copper alloy conductors Maximum values shall be in accordance with Table 1 of this standard 15 Conductors strand adhesion As BSG 230 16 High voltage As BSG 230 16(a) 16(b) Immersion Dry spark Test voltage5kV
25、 Test voltage7kV 17 Insulation resistance As BSG 230 19 Accelerated ageing Use a mandrel diameter of15times the maximum diameter of the cable Test temperature: Test time: Test tension: 313 5 C 120h 20N For the room temperature bend test use a mandrel diameter of10times the maximum diameter of the ca
26、ble Test tension: 20N For the high voltage test apply5kVBSG243:1990 BSI 01-2000 3Table 2 Cable test requirements BS G 230Test No. Purpose of test Specific requirements of this standard 22 Delamination and shrinkage Store for five cycles from room temperature to313 5 C holding the top temperature for
27、 one hour. Allow cable to return to room temperature between cycles Total length of exposed conductor (i.e.the sum of both ends) shall not exceed3mm 23 Delamination and insulation blocking Use a mandrel diameter of12times the maximum diameter of the cable Test tension: 10N for size030 25N for size05
28、0 Store for1h at260 C 24 Room temperature bend Use a mandrel diameter of10times the maximum cable O/D Test tension: 20N 25 Cold bend Use a mandrel diameter of10times the maximum cable O/D Test tension: 30N Store for6h at65 C 28 28(a) 28(b) Flammability Method1 Method2 Flame application time: 15s for
29、 Method1 15s for Method2 29 Resistance to fluids Percentage swell shall be the average of the samples tested in each fluid 30 Scrape abrasion Test temperature: 260 2 C Test force: No. of cycles: 14N 40 31 Overload resistance Test temperature T1: 360 5 C Test temperature T2: 510 10 C 35 Climatic Humi
30、dity 1 . Carry out the test in accordance with 2 c) of BSG229category A. Prepare the specimens by winding at least six turns on a mandrel of the diameter specified for test23. On removal from the chamber unwind the cable from the mandrel. The cable shall show no sign to normal vision of deterioratio
31、n, and the identification shall remain legible. The specimen shall then be subjected to the immersion test Test16(a) except that the specimen length may be reduced Fungus resistance 2 . Carry out the test in accordance with 2 j) of BSG229category F There shall be no sign to normal vision of fungusBS
32、G243:1990 4 BSI 01-2000Table 2 Cable test requirements Table 3 Test application BS G 230Test No. Purpose of test Specific requirements of this standard 36 Identification durability Test temperature: 20 5 C Minimum cycles: Applied force: 100 2 0.1N Thermal shock test (seeAppendix A) Variation of tota
33、l exposed conductor length shall not exceed1.5mm from original specimen No splitting or bubbling of the insulation outer surface is permitted Hot dielectric test (seeAppendix B) The cable shall withstand5kV r.m.s. for30min without signs of electrical failure NOTE 1BS2G 229refers to clause6 of Euroca
34、e-ED14B/RTCA DO-160B for the Humidity test. NOTE 2BS2G 229 refers to clause13 of Eurocae-ED14B/RTCA DO-160B for the Fungus resistance test. BS G 230Test No. Purpose of test No. of Specimens Qualification approval Production quality test Inspection lot test Production routine testing 1 Appearance and
35、 identification of finished cable 2 2 Mass per unit length of finished cable 1 3 Conductor composition 4 Visual examination of strands 1 5 Insulation thickness and concentricity 6 Core and cable outer diameters 7 Tensile strength and elongation at break of copper or copper alloy conductors 2 9 Stran
36、d plating continuity 1 10 Strand plating adherence 1 11 Strand plating thickness 1 12 Electrical resistance of copper or copper alloy conductors 1 15 Conductor strand adhesion 1 16 16(a) 16(b) High voltage Immersion Dry spark 3 17 Insulation resistance 3 BSG243:1990 BSI 01-2000 5Table 3 Test applica
37、tion BS G 230Test No. Purpose of test No. of Specimens Qualification approval Production quality test Inspection lot test Production routine testing 19 Accelerated ageing 1 22 Delamination and shrinkage 2 23 Delamination and insulation blocking 2 24 Room temperature bend 1 25 Cold bend 1 28a Flammab
38、ility 5 28b 5 29 Resistance to fluids 3per fluid 30 Scrape abrasion 2 31 Overload resistance 2 35 Climatic 1 36 Identification durability 1 37 Cable to cable abrasion 2 Thermal shock SeeAppendix A 2 Hot dielectric test SeeAppendix B 1 BSG243:1990 6 BSI 01-2000 Appendix A Thermal shock test Prepare a
39、 specimen of cable1.5m long by removing25 1.0mm of insulation from each end. Form the specimen into a loose coil of not less than0.3m diameter and lay it on a wire screen for handling throughout the test. Place the specimen in a pre-heated air circulating oven for30min at a temperature of260 2 C. Re
40、move the specimen from the oven and within two minutes place in another chamber which has been pre-cooled to65 2 C for a period of30min. Remove the specimen and allow a minimum period of30min to return to room temperature of20 C to25 C. At the conclusion of this test measure to the nearest0.25mm the
41、 length of exposed conductor from the end of each layer of insulation. Repeat the thermal shock cycle and the measurements for an additional three cycles. Finally, subject the specimen to the immersion test16(a) of BSG 230 using a test voltage of5kV(r.m.s.). Appendix B Hot dielectric test Wind five
42、turns of cable round a25mm diameter metal mandrel with150mm ends free, and place in an oven, Raise the temperature slowly to260 2 C. After1h at this temperature apply a voltage of3kV(r.m.s.), rising by1kV (r.m.s.) each30min to5kV (r.m.s.), between the conductor and the mandrel and maintain for30min.
43、 Examine for signs of electrical failure.BSG243:1990 BSI 01-2000 Publications referred to BS3G 100, Specification for general requirements for equipment for use in aircraft. BS3G 100-2.3.13, Resistance to fire in designated fire zones. BS2G 229, Schedule for environmental conditions and test procedu
44、res for airborne equipment. BSG 230, Specification for general requirements for aircraft electrical cables (second series). BSG 231, Specification for conductors for general purpose aircraft electrical cables and aerospace applications. BS G243:1990 BSI 389 Chiswick High Road London W4 4AL BSIBritis
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