BS-EN-61857-21-2004.pdf
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1、BRITISH STANDARD BS EN 61857-21:2004 Electrical insulation systems Procedures for thermal evaluation Part 21: Specific requirements for general-purpose models Wire-wound applications The European Standard EN 61857-21:2004 has the status of a British Standard ICS 29.080.30 ? Licensed Copy: sheffieldu
2、n sheffieldun, na, Fri Nov 10 07:31:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61857-21:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2004 BSI 1 December 2004 ISBN 0 580 44891 6 National foreword This British Stand
3、ard is the official English language version of EN 61857-21:2004. It is identical with IEC 61857-21:2004. It supersedes BS EN 61857-21:1991 and BS EN 61857-23:2002 which are withdrawn. The UK participation in its preparation was entrusted to Technical Committee GEL/98, Electrical insulation systems,
4、 which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the
5、section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct applicatio
6、n. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor
7、 related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 15 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last i
8、ssued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:31:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 61857-21 NORME EUROPENNE EUROPISCHE NORM November 2004 CENELEC European Committee for Electrotechnical Stan
9、dardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61857-21:
10、2004 E ICS 29.080.30 Supersedes EN 61857-21:1999 refer to Figure 2 for principles of construction of the GPM-TC. 4.2 Model components a) Frame: The frame consists of a rigid supporting metal base with suitable stand-off insulators of porcelain or other appropriate material bolted to one end, and wit
11、h two channels, formed by an inner and outer sheet, bolted to the other end. See Figure 1 or 2 for specific dimensions. The supporting base has holes for mounting the model during application of mechanical stress (vibration). The assembled channel portion contains two or three coils insulated from t
12、he frame by ground insulation, insulated from each other by coil-to-coil insulation and held in place by channel wedges. b) Coils: Each coil shall be wound with parallel winding wires for the conductor-to-conductor dielectric test. Coils may be machine-wound, or hand-wound on pins or forms. The ends
13、 of the parallel windings shall be isolated to allow conductor-to-conductor testing. When the GPM-TC is being used to evaluate more than one type of winding wire, the EIM being evaluated as coil-to-coil insulation must be placed such that each EIM is in contact with each type of winding wire. c) Win
14、ding wire: Heavy film-coated. A wire size of 1,0 mm to 1,12 mm is preferred. d) EIM: EIM is used as ground insulation in the channel and as coil-to-coil insulation. EIM qualified as either ground insulation or coil-to-coil insulation in an EIS may be used in either case. EIM shall represent the thic
15、kness to be evaluated. EIM placed between the coils shall be of sufficient width to provide a complete insulation barrier between the coils. The EIMs in the semicircular section shall be shaped, by cutting or other technique, to follow the curve of the coils and extend wider than the width of the wi
16、re wound coils. When the GPM-TC is being used to evaluate the performance of two sets of EIM, it is Page 6 EN 6185721:2004 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:31:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 12-75816 ? 4002:CEI 51 essential for each type of EIM to be in contact
17、 with each type of winding wire. If the EIM placed between the top and middle coils are not the same as placed between the middle and bottom coils, then the winding wire placed into the top coil shall be the same as is placed into the bottom coil. The middle coil may be wound with an alternate windi
18、ng wire. e) Channel wedge: The wedges shall be of sufficient stiffness to contain the coils in the channel. One end of the wedge shall be rounded to ensure easy passage through the channel. f) Tie cord and/or electrical grade tape. g) Electrical insulating varnish or resin, if a component of the EIS
19、, shall conform to either IEC 60455 or IEC 60464. 4.3 Assembly of the model a) Each coil shall be wound on a coil former with two parallel sides and with semicircles at both ends. The parallel sides shall have a length of 65 mm and the semicircles shall have a diameter of 45 mm. Each coil shall be c
20、omposed of a sufficient number of turns of winding wire to fill either half (GPM) or one-third (GPM-TC) of the channel leaving room for the insulation and the wedge. The unconnected ends shall be prepared by cutting off one end of each of the bifilar wires, leaving a length of 5 mm from the coil nea
21、r the middle of one of the semicircles. The two unconnected ends shall be separated from each other and from the coil by a minimum of 5 mm to ensure isolation and allow conductor-to-conductor dielectric testing. A sufficient length of the other conductor ends shall be brought out from the straight p
22、ortion of the coil for attachment to the stand-off insulators. Individual coils shall be secured with tie cord or electrical grade tape. b) Before assembly, each metal component of the model shall be completely clean and dry. These metal components shall be carefully assembled ensuring that the chan
23、nels are equal in width and the sides parallel. A simple procedure for this is to cut two wooden blocks equal in width to the channel openings and to centre the channels by placing the blocks in the channels prior to tightening the hold-down bolts. c) The channel insulation shall be cut from a piece
24、 of the EIM of the thickness to be evaluated as a 65 mm square for a GPM or a 65 mm 90 mm rectangle for a GPM-TC and bent to fit the channel. This allows the EIM to project out of the top of the channel so it can be folded under the wedge and to project 5 mm from each end of the channel. If more tha
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