ANSI C29.1 - [PDF Document] (2023)

  • ANSI C29.1-1988

    for electrical power insulators - test methods

    " " " _. (714) 261.1455 (IW) 151-7179

    COPYRIGHT American National Standards InstituteLicensed by Information Handling ServicesCOPYRIGHT American National Standards InstituteLicensed by Information Handling Services

  • ANSI @ C29.1-1988

    Revision of ANSI C29.1-1982

    American National Standard

    for El.ectrical Power Insulators - Test Methods

    Secretariat

    National Electrical Manufacturers Association

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    Approved August 23,1988

    American National Standards Institute, I nc

    COPYRIGHT American National Standards InstituteLicensed by Information Handling ServicesCOPYRIGHT American National Standards InstituteLicensed by Information Handling Services

  • A N S I C27.L 8 8 W 0724350 0027822 O

    Approval of an American National Standard requires verification by ANSI that the re- American quirements for due process, consensus. and other criteria for approval have been nlet by National the standards developer. Standard Consensus is established when, in the judgment of the ANSI Board of Standards Review,

    substantial agreement has been reached by directly and materially affected interests. Sub- stantial agreement means much more than a simple majority, but not necessarily unanim- ity. Consensus requires that all views and objections be considered, and that a concerted effort 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 man- ufacturing, marketing, purchasing, or using products, processes, or procedures not con- forming to the standards.

    The American National Standards Institute does not develop standards and will in no cir- cumstances give a n interpretation of any American National Standard. Moreover, no per- son shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for inter- pretations 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    CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time.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 American 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

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    American National Standards Institute 1430 Broadway, New York, New York 10018

    Copyright O 1989 by American National Standards Institute, Inc AU rights reserved.

    No part of this publication may be reproduced in any form, in an electIonic refrieval system or otherwise, without the prior written permission of the publisher.

    Printed in the United States of America

    AlC189/12

    COPYRIGHT American National Standards InstituteLicensed by Information Handling ServicesCOPYRIGHT American National Standards InstituteLicensed by Information Handling Services

  • Foreword (This Foreword is not part of American NationalStandard C29.1-1988.) This standard comprises a manual of procedures to be followed in making tests to deter- mine the characteristics of insulators used on electric power systems, This standard is not an insulator specification, but rather a test method to be used in conjunction with insulator specifications.

    American National Standard C29.1-1988 is a revision of American National Standard Test Methods for ElectricalPower Insulators, ANSI C29.1-1972. The present revision was prepared by Accredited Standards Committee on Insulators for Electric Power Lines, C29, which is in charge of this work.

    Suggestions for improvement of this standard will be welcome. They should be sent to The Manager of Engineering, National Electrical Manufacturers Association, 2101 L St, N W , Washington, DC 20037, Attn: Secretary, ASC C-29.

    This standard was processed and approved for submittal to ANSI by Accredited Stan- dards Committee C29. Committee appfoval does not necessarily imply that all commit- tee members voted for its approval, At the time it approved this standard, the C29 Com- mittee had the following members:

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    J. L. Nicholls, Chairman C. White, Secretary

    Organization Represented Name of Representative Association of American Railroads. . . . . . . . . . . . . . . . . . . . . . . . . (Representation Vacant) . Bonneville Power Administration. . . . . . . . . . . . . . . . . . . . . . . . . . R. L. Brown Electric Light and Power Group. . . . . . . . . . . . . . . . . . . . . . . . . . . G. A. Cook

    A. S. Jagtiani J. F. Karcher E. F. Marchbank D. Soffrin (Alt) J. Weber

    T. A. Pinkham N. E. Spauldmg (Alt)

    R. Harap J. D. Sakich (Alt) J. W. Cater B. E. Kingsbury (Alt)

    R. Harmon (Alt) A. E. Schwalm (Alt) H. Van Herk (Alt)

    Institute of Electrical and Electronics Engineers . . . . . . . . . . . . . . . . . K. Labbe

    National Electrical Manufacturers Association . . . . . . . . . . . . . . . . . . A. C. Baker

    . J . L. Nicholls

    Salisbury Co. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . R. Bridewesson Stone & Webster Engineering Corporation. .................... G. Davidson U.S. Department of the Army (Liaison, with Vote) . . . . . . . . . . . . . . . W. M. Juno

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    I

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  • Contents SECTION PAGE 1.Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 . Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

    2.1 Insulators and Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 Low-Frequency Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.3 Impulse Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.4 Mechanical Strength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.5 Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

    3 . Test-Specimen Mounting for Electrical Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.1 Suspension Insulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.2 Line Insulators (Pin. Post) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.3 Apparatus Insulators (Cap and Pin, Post) ............................ 7 3.4 Strain Insulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.5 Spool Insulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

    4 . Electrical Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .' . . . . . . . . . . . . . . . . . . . 8 4.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.2 Low-Frequency Dry Flashover Voltage Tests ......................... 8 4.3 Low-Frequency Wet Flashover Voltage Tests ......................... 9 4.4 Low-Frequency Dry Withstand Voltage Tests ......................... 9 4.6 Low-Frequency Dew Withstand Voltage Tests . . : ...................... 10 4.7 Impulse Flashover Voltage Tests .................................. 10 4.8 Impulse Withstand Voltage Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4.9 Radio-Influence Voltage Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4.10 Visual Corona Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4.1 1 Puncture Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

    5 . Mechanical Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5.1 Ultimate Mechanical-Strength Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5.2 Combined Mechanical- and Electrical-Strength Test (Suspension Insulators) . . . . . 13 5.3 Time-Load-WithstandStrength Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.4 Porosity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.5 Thermal Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5 -6 Pinhole-Gaging Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

    4.5 Low-Frequency Wet Withstand Voltage Tests ......................... 12)

    6 . Galvanizing Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7 . Routine Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

    7.1 Electrical Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.2 Mechanical Tests

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