1、STD-BSI BS EN bL77-ENGL 3797 I Lb24bb7 0755533 bOT B BRITISH STANDARD Overhead lines - Requirements and tests for Stockbridge type aeolian vibration dampers The European Standard EN 61897:1998 has the status of a British Standard ICs 29.240.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY
2、 COPYRIGHT LAW BS EN 61897:1999 IEC 61897:1998 - STD.BSI BS EN bL97-ENGL 1997 I lb24bb9 0755532 5Llb I BS EN 61897:1999 National foreword This British Standard is the English ianguage version of EN 6189Z1998. It is identical with IEC 61897 1998. “he UK pa - present to the responsible inte - monitor
3、related international and European developments and promdgak theminthem This British Standard, having been prepared under the direction of the Eiecrotechnicai Sector Committee, was published under the authority of the Standards Commime and comes into effect on 15 February 1999 A list of oganhations
4、represented on this committee can be obtained on request to its secretary, From 1 January 1997, ali IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as EC 60027-1. For a period of time during the change over from one numbering system to the o
5、ther, publications may contain idenMers from both systms. Cross-references Attention is dram to the fact that CEN and CENELEC standards nody include an annex which lists nonnative references to intedonal publications with their corresponding European publications. The British Standards which impleme
6、nt these intemationai or European publications may be found in the BSI Standards Catalogue under the section entitied “hkrnationid Standards Correspondence Index“, or by using the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necess
7、ary provisions of a contract. Users of British Standards are responsible for their correct appication. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages
8、 2 to 24, an inside back cover and a back cover. Amendments issued since publication AmdNo. ID withstand mechanical loads imposed during installation, maintenance and specified service conditions; , avoid damage to the conductor under specified service conditions; be capable of being removed and re-
9、installed without damage to the conductor; be free from unacceptable levels of corona and radio interference under all service conditions; be suitable for safe and easy installation. The clamp design shall retain all parts when opened for attachment to conductor. Furthermore, the clamp design shall
10、be such that the damper, during installation, can be suspended on the conductor before tightening the clamp; ensure that individual components will not become loose in service; maintain its function over the entire service temperature range; avoid audible noise; prevent water collection. NOTE - Othe
11、r desirable characteristics which are not essential to the basic functions of the damper but which may be advantageous include: - verification of proper installation from the ground; - ease of installation and removal from energized lines. In the case of vibration dampers for conductors or earth wir
12、es containing integral fibre optic elements (or an externally applied optical cable wrapped around the earth wire) account should be made of the possible effects of the damper on these fibre optic elements. 4.2 Materials The materials shall conform to the requiremetats of IEC 61284. 4.3 Mass, dimens
13、ions and tolerances Damper mass and significant dimensions, including appropriate tolerances, shall be shown on contract drawings. STD-BSI BS EN bL877-ENL 1779 m Lb24bb7 0755539 7TD Page 7 EN 61897:1998 4.4 Protection against corrosion In addition to the applicable requirements of IEC 61284, the mes
14、senger cable (including cut ends if applicable) shall be protected against corrosion, e.g. in accordance with IEC 60888 for hot dip galvanized steel wire. 4.5 Manufacturing appearance and finish The dampers shall be free of defects and irregularities; they shall have all outside surfaces smooth and
15、all edges and corners well-rounded. 4.6 Marking The fitting marking requirements of IEC 61284 shall be applied to all clamp assemblies including those using breakaway bolts. 4.7 Installation instructions The supplier shall provide a clear and complete description of the recommended installation proc
16、edure including in-span positions. 5 Quality assurance A quality assurance programme taking into account the requirements of this standard can be used by agreement between the purchaser and the supplier to verify the quality of the vibration dampers during the manufacturing process. Detailed informa
17、tion on the use of quality assurance is given in IS0 9000-1 l, IS0 9001 2, IS0 9002 3, IS0 9003 4 and IS0 9004-1 5. It is recommended that test equipment used to verify compliance to this standard is routinely maintained and calibrated in accordance with a relevant quality standard. 6 Classification
18、 of tests 6.1 Type tests 6.1.1 General Type tests are intended to establish design characteristics. They are normally made once and repeated only when the design or the material of the damper components is changed. The results of type tests are recorded as evidence of compliance with design requirem
19、ents. 6.1 -2 Application Dampers shall be subjected to type tests as per table 1. Unless otherwise specified, each type test shall be performed on three test samples which are identical in all essential respects with dampers to be supplied under contract to the purchaser. All units shall pass the te
20、sts. Figures in square brackets refer to the bibliography. - STD-BSI BS EN b1877-ENGL L777 I lb2Ybb7 07555YO bL2 Page 8 EN 61897:1998 The dampers used for tests during which no damage occurs to the units or their components may be used in subsequent tests. 6.2 Sample tests 6.2.1 General Sample tests
21、 are required to verify that the dampers meet the performance specifications of the type test samples. In addition, they are intended to verify the quality of material and workmanship. 6.2.2 Application Dampers shall be subjected to sample tests as per table 1. The samples to be tested shall be sele
22、cted at random from the lot offered for acceptance. The purchaser has the right to make the selection. The dampers used for tests during which no damage occurs to the units or their components may be used in subsequent tests. 6.2.3 Sampling, acceptance criteria The sampling plan procedures according
23、 to IS0 2859-1 and IS0 2859-2 (inspection by attributes) and IS0 3951 (inspection by variables) and the detailed procedures (inspection level, AQL, single, double or multiple sampling, etc.) shall be agreed between the purchaser and the supplier for each different attribute or variable. NOTE - Sampl
24、ing inspection by variables is an acceptance sampling procedure to be used in place of inspection by attributes when it is appropriate to measure on some continuous scaie the characteristic(s) under consideration. In ths case of failure load tests and similar expensive tests, better distinction betw
25、een acceptable quality and objective quality is available with acceptance sampling by variables than by attributes for the same sample size. The purpose of the sampling process may also be important in the choice between a variables or attributes plan. For example, a purchaser may choose to use an a
26、ttributes acceptance sampling pian to assure that paris in a shipment lot are within a required dimensional tolerance; the manufacturer may make measurements under a variables sampling plan of the same dimensions because he is concerned with gradual trends or changes which may affect his ability to
27、provide shipment lots which meet the AQL. 6.3 Routine tests 6.3.1 General Routine tests are intended to prove conformance of vibration dampers to specific requirements and are made on every damper. The tests shall not damage the dampers. 6.3.2 Application and acceptance criteria Whole lots of damper
28、s may be subjected to routine tests. Any damper which does not conform to the requirements shall be discarded. I STD*BSI BS EN b1897-ENGL. 1999 E Jib24bb9 07555411 559 E - 7.7 Clamp blt tightening test X X 7.8 Attachment of weights to messenger cable X X Page 9 EN 61897:1998 Subclause 6.4 The follow
29、ing table 1 indicates the tests which shall be performed. These are marked with an “X“ in the table. Table of tests to be applied Test Type Sample Routine test test test However, the purchaser may specify additional tests which are included in the table and marked with an “O“. 7.1 7.2 7.3 Units or c
30、omponents damaged during the test shall be excluded from the delivery to the customer. Visual examination X X O Verification of dimensions, materials and mass X. X Corrosion protection tests X X Table 1 - Tests on dampers 7.9 7.10 Attachment of clamp to messenger cable test X X Corona and radio inte
31、rference voltage (RIV) tests x 1) 7.1 1 7.1 1.2 7.1 1.3 7.4 I Non-destructive tests I O I O 1 O 7.5 I Clamo siio test X O Damper performance tests - Damper characterist,ic test - Damper effectiveness evaluation I 7.6 I Breakaway bolt teSi 1x1 X I X X O I 7.12 I Damper fatigue test 1x1 I l) Not appli
32、cable for earth wire dampers. NOTE - The supplier should state in the tender quality plan, or other tender documentation, which testing is already complete (.e. which type tests) and which tests (sample or routine) are included in the tender, subject to the approval or change required by the purchas
33、er. 7 Test methods 7.1 Visual examination Type tests shall include visual examination to ascertain conformity of the dampers in all essential respects, with the manufacturing or contract drawings. Deviations from the drawings shall be subject to the approval of the purchaser and shall be appropriate
34、ly documented as an agreed concession. Sample tests and, if required, routine tests shall include visual examination to ensure conformity of manufacturing process, shape, coating and surface finish of the damper with the contract drawings. Particular attention shall be given to markings required and
35、 to the finish of surfaces which come into contact with the conductor. The sample test prxedure and acceptance criteria shall be agreed between the purchaser and the supplier. STDmBSI BS EN b1877-ENGL 1777 E Lb2Libb7 0755592 q?!C, Page 10 EN 6-1897:1998 For dampers subjected to corona type test, the
36、 sample test shall include a comparison of shape and surface finish with one of the corona type test samples when specified by the purchaser. 7.2 Verification of dimensions, materials and mass Type and sample tests shall include verification of dimensions to ensure that dampers are within the dimens
37、ional tolerances stated on contract drawings. The purchaser may choose to witness the measurement of selected dimensions or may inspect the suppliers documentation when this is available. Type and sample tests shall also include verification of materials to ensure that they are in accordance with co
38、ntract drawings and documents. This verification shall normally be carried out by the purchaser inspecting the suppliers documentation relating to material specifications, certificates of conformity or other quality documentation. The total mass of the damper complete with all its components shall c
39、omply with the mass shown on the contract drawing (within given tolerances). 7.3 Corrosion protection tests 7.3.1 Hot dip galvanized components (other than messenger cable wires) Hot dip galvanized components other than messenger cable wires shall be tested in accordance with the requirements specif
40、ied in IS0 1461. The coating thicknesses shall conform to tables 2 and 3 unless otherwise agreed between purchaser and sumlier. However, for the purDose of this standard, tables 2 and 3 in IS0 1461 shall apply to the following categories of items (and not to the categories specified in IS0 1461). Ta
41、ble 2: Coating thickness on all samples except - washers; - threaded components; - small parts which are centrifuged (significant surface area c1 O00 mm2). Table 3: Coating thickness on - washers; - threaded components; - small parts which are centrifuged (significant surface area cl O00 mm2). 7.3.2
42、 Ferrous components protected from corrosion by methods other than hot dip galvanizing Ferrous components protected from corrosion by methods other than hot dip galvanizing shall be tested in accordance with the requirements of relevant IECASO standards agreed between purchaser and supplier. 7.3.3 H
43、ot dip galvanized meqsenger cable wires Hot dip galvanized messenger cable wires shall be tested in accordance with the requirements specified in IEC 60888. Page 11 EN 61897:1998 7.4 Non-destructive tests The purchaser shall specify or agree to relevant test methods (IS0 or other) and acceptance cri
44、teria. Examples of non-destructive tests are as follows: - magnetic test; - eddy current test; - radiographic test; - ultrasonic test; - proof load test; - dye penetrant test; - hardness test. 7.5 Clamp slip test The test shall be performed using the conductor for which the clamp is intended. The co
45、nductor shall be “as new“, .e. free of any deterioration or damage. The minimum free length of test conductor between its terminating fittings shall be 2 m. The conductor shall be tensioned to 20 % of its rated tensile strength. Precautions shall be taken to avoid birdcaging of the conductor. The cl
46、amp shall be installed in accordance with the suppliers instructions on a different portion of conductor for each test. In the case of breakaway bolts, the installation torque shall be the design value minus the tolerance agreed between the purchaser and the supplier (see 7.7). NOTE - The use of oth
47、er conductors, or conductor lengths or tensions may be agreed between purchaser and supplier. By means of a suitable device a load coaxial to the conductor shall be applied to the clamp. The load shall be gradually increased (not faster than 100 N/s) until it reaches 2,5 kN (specified minimum slip l
48、oad). This load shall be kept constant for 60 s. Then the load value shall be gradually increased until slippage of the clamp occurs. The value of slip load shall be recorded. Clamp slip shall be considered as having occurred when a slip distance of 1 mm is measured. 0 Acceptance criteria No movemen
49、t of the clamp relative to the conductor greater than 1 mm shall occur at or before the end of application of 2,5 kN for 60 s. If both a minimum and a maximum slip load are stated, the slip shall occur between those values. Surface flattening of the outer strands of the conductor is acceptable. 7.6 Breakaway bolt test The breakaway bolts, if used, shall be tested by applying increasing torque to the breakaway portion until it breaks away. The breakaway torque shall be recorded. The breakaway torque shall be within the tolerance agr
