1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI/NEMA C29.2B-2013American National Standard for Insulators Wet Process Porcelain and Toughened Glass Transmission SuspensionTypeANSI/NEMA C29.2 B-2013 American National Standard for Insulators Wet Process Porcelain and Toughe
2、ned Glass Transmission Suspension Type Secretariat: National Electrical Manufacturers Association Approved: May 2013 Published: November 15, 2013 American National Standards Institute, Inc. NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of
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18、nal Electrical Manufacturers Association 1300 North 17th Street, Suite 900, Rosslyn, VA 22209 Copyright 2013 by National Electrical Manufacturers Association All rights reserved including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for th
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20、f America. C29.2B-2013 Page i 2013 National Electrical Manufacturers Association FOREWORD (This Foreword is not part of American National Standard C29.2 B-2013) This standard has its origins in one of a series of standards issued 1952 by the Joint Committee on Insulator Standards of the Edison Elect
21、ric Institute and the National Electrical Manufacturers Association. That original 1952 standard was designated as: EEI-NEMA Standards for Wet-Process Porcelain Insulators (Suspension Type), EEI Publication Number TDJ-52, NEMA 140-1952. Several subsequent revisions were made and issued by the Americ
22、an Standards Association, Inc., and more recently by the American National Standards Institute (ANSI), as an American National Standard. ANSI C29.2-2012 has now been divided into two parts; C29 A and C29 B, where insulators with shell diameters less than 9 inches (228.6 mm) now are covered by C29.2A
23、 and those with shell diameters of at least 9 inches (228.6 mm) now are being covered by C29.2B. Suggestions for improvement of this standard will be welcome. They should be sent by the date of its next scheduled revision which is December 31st, 2015 to: Senior Technical Director, Operations Nationa
24、l Electrical Manufacturers Association 1300 North 17th Street Rosslyn, VA 22209 This standard was processed and approved for submittal to ANSI by Accredited Standards Committee on Insulators for Electric Power Lines, C29. Committee approval of the standard does not necessarily imply that all committ
25、ee members voted for approval. At the time it approved this standard, the ASC C-29 committee had the following members: Rob Christman, Chairman Steve Griffith, Secretary Organization Represented: Name of Representative: Edison Electric Institute B. Freimark R. Christman E. Cleckley M. Garrels R. Klu
26、ge J. Varner (alt) G. Obenchain (alt) Institute of Electrical and Electronic Engineers T. Grisham J. Hildreth A. Jagtiani J. Kuffel E. Gnandt (alt) National Electrical Manufacturers Association P. Maloney A.C. Baker R.A. Bernstorf D.G. Powell G.A. Stewart E. Willis (alt) Z. Lodi (alt) E. Niedospial
27、(alt) A. Schwalm (alt) C29.2B-2013 Page ii 2013 National Electrical Manufacturers Association Tennessee Valley Authority J. Nelson R. Stargel (alt) Western Area Power Administration R. Clark C29.2B-2013 Page iii 2013 National Electrical Manufacturers Association C29.2B-2013 Page iv 2013 National Ele
28、ctrical Manufacturers Association TABLE OF CONTENTS Page FOREWORD . iv 1 SCOPE 1 2 NORMATIVE REFERENCES 1 3 DEFINITIONS 1 4 GENERAL 1 5 MATERIALS 2 5.1 Insulator Shells 2 5.2 Shell Surface . 2 5.3 Metal Parts . 2 5.4 Cotter Keys . 2 5.4.1 Material . 2 5.4.2 Ball-and Socket Insulators 2 5.4.2 Clevis
29、Insulators 2 6 DIMENSIONS AND CHARACTERISTICS 2 7 MARKING 3 8 SAMPLING, INSPECTION, AND TESTS 3 8.1 General 3 8.2 Design Tests . 3 8.2.1 Low-Frequency Dry Flashover Test . 3 8.2.2 Low-Frequency Wet Flashover Test 3 8.2.3 Critical Impulse Flashover Tests-Positive and Negative 4 8.2.4 Radio-Influence
30、Voltage Test . 4 8.2.5 Thermal-Mechanical Load Cycle Test 4 8.2.6 Thermal Shock Test . 4 8.2.7 Residual-Strength Test 4 8.2.8 Impact Test . 5 8.2.6 Cotter Key Test . 5 8.2.10 Cement Expansion . 5 8.2.11 Design Modification 5 8.3 Quality Conformance Tests 5 8.3.1 Visual and Dimensional Tests 5 8.3.2
31、Porosity Tests . 5 8.3.3 Galvanizing Test 6 8.3.4 Combined Mechanical and Electrical-Strength Test 6 8.3.5 Puncture Test 6 8.3.6 Verification of Coupling Lock System .6 8.4 Routine Tests .7 8.4.1 Cold-to-Hot Thermal Shock Test . 7 8.4.2 Hot-to-Cold Thermal Shock Test . 7 8.4.3 Tension Proof Test . 7
32、 8.4.4 Flashover Test . . 7 TABLES 1 Metric Equivalents . 3 2 Dimensions and Electrical Characteristics of Ball-and-Socket and Clevis Transmission Insulators 9 3 Dimensions of Clevis Transmission Insulators 12 C29.2B-2013 Page v 2013 National Electrical Manufacturers Association FIGURES 1 Ball-and-S
33、ocket Suspension Insulator Classes 52-3-L, 52-3-H, 52-5-L, 52-5-H, 52-8-L, 52-8-H, and 52-11 13 2 Clevis Suspension Insulator Classes 52-4-L, 52-4-H, 52-6-L, 52-6-H, 52-10-L, 52-10-H, and 52-12 . 14 3 Ball Gauge for Class 52-3-L MNL7), and further references stated therein. This manual also contains
34、 additional information on methods of computation such as those given in 8.3.4. 8.3.3 Galvanizing Test C29.2B-2013 Page 6 2013 National Electrical Manufacturers Association Five pieces representative of each type of galvanized hardware used with the insulators shall be selected at random and tested
35、in accordance with Section 6 of ANSI C29.1. Five to ten measurements shall be randomly distributed over the entire surface. Both the average thickness value for each individual specimen and the average of the entire sample shall equal or exceed the following: Average of Entire Sample Average of Indi
36、vidual Specimen Hardware (except nuts/bolts) 3.4 mil 3.1 mil Nuts/bolts 2.1 mil 1.7 mil If the average of one specimen, or if the average of the entire sample, fails to comply with the table above, then the re-test procedure in section 4.4 shall be applied. 8.3.4 Combined Mechanical and Electrical-S
37、trength Test Ten assembled insulators shall be selected at random from the lot and tested in accordance with 5.2 of ANSI C29.1. The criteria for determining conformance with the standard are as follows: a) All insulators subjected to the combined mechanical and electrical-strength test shall equal o
38、r exceed the rated combined mechanical and electrical strengths as given in Table 2 of this standard. b) For all insulators listed in Table 2. SRatingX 3 Where: X is the average value obtained on the sample insulators tested S is the standard deviation obtained on the sample insulators tested The fa
39、ilure mode for each sample subjected to the combined mechanical and electrical-strength test shall be recorded. The re-test procedure in section 4.4 is applicable to this test. 8.3.5 Puncture Test Five assembled insulators shall be selected at random and tested in accordance with 4.11 of ANSI C29.1.
40、 The criterion for determining conformance to this standard is: No puncture shall occur below the specified puncture voltage. To provide information the test voltage may be raised until puncture occurs, and the puncture voltage recorded. The re-test procedure in section 4.4 is applicable to this tes
41、t. 8.3.6 Verification of Coupling Lock System Six ball-and-socket insulators shall be coupled in 3 strings of two units with the cotter key in the locking position. Each string shall then be subjected to an attempt to disengage the ball from the socket, applying relative movements by hand representa
42、tive of those encountered in use. The disengagement of any ball shall constitute failure of the lot to meet the requirements of this standard. C29.2B-2013 Page 7 2013 National Electrical Manufacturers Association 8.4 Routine tests 8.4.1 Cold-to-Hot Thermal Shock Test Each toughened glass shell shall
43、 be submitted to a thermal shock, bringing it from ambient temperature to a temperature at least 540F (300C) higher, and shall be maintained at the higher temperature for at least 1 minute. All toughened glass shells that fracture do not meet the requirements of this standard. 8.4.2 Hot-to-Cold Ther
44、mal Shock Test Each toughened glass shell shall be quickly and completely immersed in water at a temperature not exceeding 122F (50C), the shell having been heated by hot air or other suitable means to a uniform temperature of at least 180F (100C) higher than that of the water. All toughened glass s
45、hells that fracture do not meet the requirements of this standard. 8.4.3 Tension Proof Test Each assembled insulator shall be subjected to a tension proof test in accordance with 7.2.1 of ANSI C29.1. The load applied shall be that shown in Table 2. All insulators that fail do not meet the requiremen
46、ts of this standard. 8.4.4 Flashover Test Each porcelain insulator shall be subjected to a routine flashover test in accordance with 7.1 of ANSI C29.1. All insulators that puncture fail to meet the requirements of this standard. C29.2B-2013 Page 8 2013 National Electrical Manufacturers Association C
47、29.2B-2013 Page 9 2013 National Electrical Manufacturers Association Table 2 Dimensions and Electrical Characteristics of Ball-and-Socket and Clevis Transmission Insulators6 ANSI Class Connection type Dimensional Values Mechanical Values Electrical Values Radio-influence Voltage Leakage distance, in
48、ches (mm) Spacing, inches (mm) Shell diameter, inches (mm) M for example, a = 1/64 in. When two letters are used, the first is a plus tolerance, and the second a minus; for example, ax = 1/64 in., -0. a = 1/64 in. c = 1/16 in. b = 1/32 in. d = 1/8 in. x = 0 NOTES 1 For specific diameter and tolerance, see manufacturers drawings 2 All dimensions are in inches; for metric equivalents, see table 1. 3 The connecting length of a string of six insulators selected at random shall be equal to six times the nominal spacing of the insula
