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NEMA C29 2B-2013 Wet Process Porcelain and Toughened Glass - Transmission Suspension Type.pdf

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

3、 persons engaged in the development and approval of the document at the time it was developed. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the development of this document. American National Standards Institute (ANSI) standards and guidel

4、ine publications, of which the document contained herein is one, are developed through a voluntary consensus standards development process. This process brings together volunteers and/or seeks out the views of persons who have an interest in the topic covered by this publication. While NEMA administ

5、ers the process and establishes rules to promote fairness in the development of consensus, it does not write the document and it does not independently test, evaluate, or verify the accuracy or completeness of any information or the soundness of any judgments contained in its standards and guideline

6、 publications. NEMA disclaims liability for any personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, application, or reliance on this document. NEMA disclaims an

7、d makes no guaranty or warranty, express or implied, as to the accuracy or completeness of any information published herein, and disclaims and makes no warranty that the information in this document will fulfill any of your particular purposes or needs. NEMA does not undertake to guarantee the perfo

8、rmance of any individual manufacturer or sellers products or services by virtue of this standard or guide. In publishing and making this document available, NEMA is not undertaking to render professional or other services for or on behalf of any person or entity, nor is NEMA undertaking to perform a

9、ny duty owed by any person or entity to someone else. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances. Information and other standar

10、ds on the topic covered by this publication may be available from other sources, which the user may wish to consult for additional views or information not covered by this publication. NEMA has no power, nor does it undertake to police or enforce compliance with the contents of this document. NEMA d

11、oes not certify, test, or inspect products, designs, or installations for safety or health purposes. Any certification or other statement of compliance with any health or safetyrelated information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or

12、 maker of the statement. AMERICAN NATIONAL STANDARD Approval of an American National Standard requires verification by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of th

13、e ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted ef

14、fort be made toward their resolution. The use of American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conf

15、orming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in th

16、e name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. Caution Notice: This American National Standard may be revised or withdrawn at any time. The procedures of the Am

17、erican National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Published by Natio

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

19、e Protection of Literary and Artistiac Works, and the International and Pan American Copyright Conventions. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. Printed in the United States o

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

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