1、BRITISH STANDARD BS3288-3: 1989 Specification for Insulator and conductor fittings for overhead power lines Part 3: Dimensions of ball and socket couplings of string insulator units UDC 621.315.1:621.315.62/.65BS3288-3:1989 This British Standard, having been prepared under the directionof the Power
2、Electrical Engineering Standards Committee, was published underthe authority of the BoardofBSIand comes into effect on 31 May1989 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference PEL/70 Draft for comment86/30888 DC ISBN 0 580 16815 8 Committees respon
3、sible for this British Standard The preparation of this British Standard was entrusted by the Power Electrical Engineering Standards Committee (PEL/-) to Technical Committee PEL/70 upon which the following bodies were represented: Association of Consulting Engineers Association of Manufacturers Alli
4、ed to the Electrical and Electronic Industry (BEAMA Ltd.) British Cable Makers Confederation British Ceramic Research Ltd. British Industrial Ceramic Manufacturers Association Department of Energy (Electricity Division) Electrical and Electronic Insulation Association (BEAMA Ltd.) Transmission and D
5、istribution Association (BEAMA Ltd.) The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Aluminium Federation British Railways Board Electricity Supply Industry in England and Wales National Association of Malleable Ironfounders Overhead Tran
6、smission Line Contractors Amendments issued since publication Amd. No. Date of issue CommentsBS3288-3:1989 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Object 1 3 Plan of the standard 1 4 Pin ball 1 5 Socket 1 6 Hook-on “GO” gauge 1 7 Lower part of th
7、e insulator 1 8 Locking device 2 9 Dimensions of the pin ball 2 10 Dimensions of the socket end 3 11 Dimensions of the hook-on “GO” gauge 4 12 Dimensions of twin-balled pins 6 13 Clearance between the pin ball and the socket end 7 14 Effectiveness of locking the pin ball 8 15 Dimensions of the hole
8、for the split-pin 9 16 Dimensions of the hole for the W-clip 10 Appendix A Sliding position and over-tilting position of the pin ball in the socket end 11 Appendix B Recommended gauges 11BS3288-3:1989 ii BSI 07-1999 Foreword This Part of BS3288 has been prepared under the direction of the Power Elec
9、trical Engineering Standards Committee. It is technically equivalent to IEC120:1984, published by the International Electrotechnical Commission (IEC), except that the more compact British design of the size28 coupling has been added as size28B. This Part of BS3288 implements CENELEC Harmonization Do
10、cument HD474 and includes the28B ball and socket coupling which the UK has been permitted to retain as a national type. It is not envisaged that split-pins will be used in28B couplings and the dimensions of the corresponding holes have not been included. For ease of production the text of the IEC pu
11、blication has been used. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as th
12、e decimal marker. 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 itself confer immunity from legal obligations. Summary of pages This d
13、ocument comprises a front cover, an inside front cover, pagesi andii, pages 1 to24 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS3288-3:1989 BSI 07-1999 1 1 Sco
14、pe This standard applies to string insulator units of the cap and pin and long rod types and their associated metal fittings. 2 Object The object of this standard is to define the dimensions of a series of standard ball and socket couplings using the standard locking devices (see BS3288-4) in order
15、to permit the assembly of insulators or metal fittings supplied by different manufacturers. NOTEOnly the dimensions necessary for assembly are dealt with in this standard. Properties of material and working loads are not specified. The co-ordination of dimensions with strength classes is specified i
16、n BS137-2. 3 Plan of the standard This standard includes standard sizes designated by the nominal pin diameters which form the basis of the standard. Each standard size is defined by the dimensions of the pin ball, of the socket and of the hook-on “GO” gauge specified in Clauses9 to11. Dimensions of
17、 twin-balled pins for coupling of two sockets are stated in Clause12. Clearance and locking conditions are tabulated in Clauses13 and14. Dimensions of the hole for the locking device are stated in Clauses15 and16. All dimensions are expressed in millimetres. For the pin ball and the socket, dimensio
18、ns apply to the finished product after any surface treatment. Extreme positions of the pin ball in the socket are given inAppendix A. Typical examples of gauges for checking the dimensions of pin balls and sockets are given in Appendix B. 4 Pin ball The pin ball shall conform to the dimensions speci
19、fied in Clause9. The main dimensions governing the shape of the pin ball are h 1,d 2 , r 1and r 2 . Dimension r 3is given for guidance because its accurate value may be obtained only by the drawing. In addition, the shank diameter d 1 , shall not exceed the specified values within a length equal to
20、H 3of the corresponding worn hook-on “GO” gauge (see Clause11). NOTEThere are two designs for the28mm ball and socket coupling. The one adopted by IEC is listed in this standard as “28”; the more compact British design is listed as “28”. The28B coupling is available only with a W-clip. 5 Socket The
21、socket interior shall conform to the dimensions specified in Clause10, which also specifies the minimum thickness of the locking device. NOTE 1Sockets according to the clause mentioned are shown with flat bottoms. Sockets with rounded bottoms with radii of curvature not less than the dimensions r 2o
22、f the pin balls can also be used. In this case, the dimensions R 5have to be correspondingly decreased. NOTE 2The16mm standard size according to Clause10 includes two alternative sockets. The reason for this is that, on the one hand, there is a need for a socket fitting exactly the standard pin ball
23、 and its predecessors with r 1 =23 (alternative A) and, on the other hand, there is a need for a socket also accepting pin balls with r 2 =50 (alternative B). Alternative A and alternative B are identical except for dimensions H 1 , H 2and T. Alternative A, having the smaller dimensions, is preferab
24、le where assembly with existing pin balls does not require alternative B. NOTE 3See Note to Clause4 for an explanation of28 and28B couplings. 6 Hook-on “GO” gauge The external dimensions of the socket have not been laid down. However, the socket shall permit acceptance of the hook-on “GO” gauge acco
25、rding to Clause11. 7 Lower part of the insulator The shape of the lower part of the insulator shall be such that assembly with the socket of maximum external dimensions according to Clause6 will always be possible.BS3288-3:1989 2 BSI 07-1999 8 Locking device The locking device, i.e.a split-pin or W-
26、clip, shall be designed for locking the minimum-size pin ball in the maximum size socket. This requirement is fulfilled if the locking devices standardized in BS3288-4 are used. 9 Dimensions of the pin ball Designated size of coupling d 1 d 2 h 1 r 1 r 2 r 3 a r 4 11 35 35 3,5 16 23 50 3 20 27 60 5,
27、7 24 40 70 6,6 28 b 55 80 8 28B b 50 100 64 32 70 90 10 a Given for guidance. b See Note to Clause4. 11,9 0 1,1 22,81,3 0 9,1 0 1,2 1,5 +1 0 17 0 1,2 33,31,5 0 13,4 0 1,3 3 +1 0,5 21 0 1,3 411,6 0 19,5 0 1,4 3,5 1 +1 25 0 1,4 491,8 0 21 0 1,7 4 +1,5 1,0 29 0 1,5 571,9 0 23,5 0 1,8 4,5 +1,5 1,0 29 0
28、1,5 561,8 0 21 0 1,7 4,5 +1,5 1,0 33 0 1,6 652,1 0 27 0 1,9 5 +1,5 1,0BS3288-3:1989 BSI 07-1999 3 10 Dimensions of the socket end Designated size of coupling D 1 D 2 D 3 H 1 H 2 for W-clips and alternative split-pins H 2 c for standard split-pins R 1 R 3 R 4 R 5 T b Min. Min. Min. Min. Min. 11 24,5
29、24,5 15,5 16,3 35 4 1,5 4 4,8 16A a 34,5 34,5 20,5 21,6 23 3 3 5 5,5 16B a 34,5 34,5 25 25,5 23 3 3 5 7,9 20 42,5 42,5 28,5 29,3 27 6 3,5 7 7,0 24 51 51 32,5 33,5 40 5 4 10 8,7 28 d 59 59 36,5 37,4 55 8 4,5 12 10 28B d 58 58 32,5 50 5 5 10 8,7 32 67,5 67,5 42 43 70 10 5 14 11,5 a See Note2 to Clause
30、5. b Thickness of the locking device. c A greater value is given because in this case the split-pin does not always rest on the bottom of the socket. The position of the standard split-pin is determined by the position H 3of the centre of the hole and its diameter D 4(see Clause15) and F 2 (see BS32
31、88-4) and is also influenced by the tips of the legs resting in contact with the socket.The values of H 2ensures the correct clearances for split-pins. d See Note to Clause4. 12,5 0 +1,3 10,5 0 +1,3 19,2 0 +1,6 14,5 0 +1,6 19,2 0 +1,6 17 + 1,6 0 23 0 +2,1 20,5 0 +2,1 27,5 0 +2,5 23,5 0 +2,5 32 + 2,9
32、 0 26 0 +2,9 31,5 0 +2,5 23,5 0 +2,5 36 +3,3 0 30 0 3,3BS3288-3:1989 4 BSI 07-1999 11 Dimensions of the hook-on “GO” gaugeBS 3288-3:1989 BSI 07-1999 5 Designated size of coupling Gauge D 1 D 2 D 3 D 4 H 1 H 2 H 3 R 1 R 2 R 3 R 4 R 5 R 6 11 Max. contour a 12,000 22,950 25,322 60,15 9,250 17,775 23,77
33、5 35,075 35,075 3,631 1,450 49,70 2,80 New Nominal contour 11,980 22,920 25,348 59,95 9,220 17,860 23,860 35,060 35,060 3,616 1,460 49,80 2,70 Min. contour a 11,960 22,890 25,374 59,75 9,190 17,945 23,945 35,045 35,045 3,601 1,470 49,90 2,60 Worn b 11,900 22,800 25,400 59,55 9,100 18,000 24,000 35,0
34、00 35,000 3,556 1,500 50,00 2,50 16 New Max. contour a 17,122 33,490 35,326 90,59 13,572 20,686 31,786 23,086 50,086 3,071 2,939 71.70 2,80 Nominal contour 17,096 33,450 35,351 90,39 13,536 20,768 31,868 23,068 50,068 3,055 2,952 71,80 2,70 Min. contour a 17,070 33,410 35,376 90,19 13,500 20,850 31,
35、950 23,050 50,050 3,039 2,965 71,90 2,60 Worn b 17,000 33,300 35,400 89,99 13,400 20,900 32,000 23,000 50,000 2,993 3,000 72,00 2,50 20 New Max. contour a 21,150 41,220 45,484 120,95 19,702 25,551 42,151 27,101 60,101 5,845 3,425 89,55 3,45 Nominal contour 21,120 41,170 45,523 120,65 19,656 25,678 4
36、2,278 27,078 60,078 5,824 3,440 89,70 3,30 Min. contour a 21,090 41,120 45,561 120,35 19,610 25,805 42,405 27,055 60,055 5,803 3,455 89,85 3,15 Worn b 21,000 41,000 45,600 120,05 19,500 25,900 42,500 27,000 60,000 5,753 3,500 90,00 3,00 24 New Max. contour a 25,172 49,250 50,490 140,90 21,242 25,971
37、 46,171 40,121 70,121 6,732 3,914 104,55 3,45 Nominal contour 25,136 49,190 50,527 140,60 21,186 26,093 46,293 40,093 70,093 6,706 3,932 104,70 3,30 Min. contour a 25,100 49,130 50,564 140,30 21,130 26,215 46,415 40,065 70,065 6,680 3,950 104,85 3,15 Worn b 25,000 49,000 50,600 140,00 21,000 26,300
38、46,500 40,000 70,000 6,615 4,000 105,00 3,00 28 c New Max. contour a 29,190 57,290 66,870 165,94 23,770 29,100 51,100 55,135 80,135 7,994 4,414 129,55 3,45 Nominal contour 29,150 57,215 66,915 165,64 23,708 29,250 51,250 55,104 80,104 7,967 4,432 129,70 3,30 Min. contour a 29,110 57,140 66,960 165,3
39、4 23,646 29,400 51,400 55,073 80,073 7,938 4,450 129,85 3,15 Worn b 29,000 57,000 67,000 165,04 23,500 29,500 51,500 55,000 80,000 7,864 4,500 130,00 3,00 28B c New Max. contour a 29,190 56,280 79,850 170,90 21,242 28,000 43,900 50,130 100,150 6,473 4,914 169,55 3,45 Nominal contour 29,150 56,210 79
40、,900 170,60 21,186 28,101 44,000 50,100 100,100 6,448 4,932 169,70 3,30 Min. contour a 29,110 56,140 79,950 170,30 21,130 28,203 44,100 50,070 100,050 6,423 4,950 169,85 3,15 Worn b 29,000 56,000 80,000 170,00 21,000 28,305 44,200 50,000 100,000 6,360 5,000 170,00 3,00 32 New Max. contour a 33,220 6
41、5,310 85,800 198,45 27,300 34,000 61,400 70,150 90,150 9,719 4,914 149,55 3,45 Nominal contour 33,170 65,230 85,850 198,22 25,225 34,175 61,600 70,112 90,113 9,683 4,932 149,70 3,30 Min. contour a 33,120 65,150 87,900 197,98 27,150 34,350 61,800 70,075 90,075 9,647 4,950 149,85 3,15 Worn b 33,000 65
42、,000 86,000 197,83 27,000 34,500 62,000 70,000 90,000 9,572 5,000 150,00 3,00 a The counter of the new gauge should fall between the maximum and minimum contours. b See ClauseB.1. c See Note to Clause4.BS3288-3:1989 6 BSI 07-1999 12 Dimensions of twin-balled pins Designated size of coupling h 4 11 1
43、6 20 24 28 32 For other dimensions, see Clause9. 47 2,5 0 63 3,0 0 83 3,2 0 90 3,5 0 97 3,5 0 120 4,0 0BS3288-3:1989 BSI 07-1999 7 13 Clearance between the pin ball socket end Designated size ofcoupling D 1 d 1 D 2 d 2 D 3 d 2 P Q a Min. Max. Min. Min. Max. Min. 11 0,6 3,0 1,7 1,7 1,4 3,9 1,6 16A 2,
44、2 5,0 1,2 1,2 1,1 4,0 1,6 16B 2,2 5,0 1,2 1,2 3,6 6,5 3,7 20 2,0 5,4 1,5 1,5 1,0 4,5 2,0 24 2,5 6,4 2,0 2,0 2,5 6,7 2,8 28 b 3,0 7,4 2,0 2,0 2,5 7,2 3,0 28B b 2,5 6,5 2,0 2,0 2,5 6,7 2,8 32 3,0 7,9 2,2,5 3,0 8,2 3,5 a Clearance between the pin ball and the locking device. b See Note to Clause4.BS328
45、8-3:1989 8 BSI 07-1999 14 Effectiveness of locking the pin ball Designated size of coupling S Min. 11 0,9 16A 1,5 16B 1,4 20 2,5 24 2,0 28 a 2,8 28B a 2,0 32 3,3 a See Note to Clause4.BS3288-3:1989 BSI 07-1999 9 15 Dimensions of the hole for the split-pin Standard couplings D 4 D 5 H 3 K L Min. Min.
46、 Max. 11 7,5 0,4 13,5 3,5 0,6 26 16A 9,5 0,5 16,0 4 0,7 32 16B 10 0,5 18,0 5 0,6 32 20 10 0,5 18,0 5 1 40 24 12 0,5 21,5 6 1 51 28 a 13 0,5 24,0 7 1,2 59 32 15 0,5 28,0 8 1,4 68 a See Note to Clause4 The dimensions are applicable to both standard and alternative split-pins (see BS3288-4). 3,75 0 +1
47、4,75 0 +1 5 0 +1 5 0 +1,2 6 0 +1,5 6,5 0 +1,5 7,5 0 +1,5BS3288-3:1989 10 BSI 07-1999 16 Dimensions of the hole for the W-clip Standard couplings B 1 B 2 H 3 L Min. Max. 11 12,5 0,8 24 6,5 0,8 18 16A 16 1 33 7 0,8 24 16B 16 1 33 9,5 0,8 24 20 17 1 34 8,5 0,8 29 24 17,5 1 34,5 10,5 0,8 34 28 a 20 1 39
48、 11,5 0,8 42 28B a 17,5 1 34,5 10,5 0,8 42 32 22 1 42 13,0 0,8 48 a See Note to Clause4. Dimension B 2is the length of the recess over which the height H 3shall be maintained. Beyond B 2 , the shape of the recess is not important.BS3288-3:1989 BSI 07-1999 11 Appendix A Sliding position and over-tilt
49、ing position of the pin ball in the socket end A.1 Sliding position of the pin ball in the socket end A.2 Over-tilting position of the pin ball in the socket end Appendix B Recommended gauges B.1 Tolerance system The tolerances for the gauges follow the ISO system. This means that the “NOT GO” gauges only have manufacturing tolerances which are symmetrically located in relation to the corresponding tolerance limit of the coupling part. It also means that the
