1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI/NEMA C29.4-2015Wet Process Porcelain Insulators Strain TypeANSI/NEMA C29.4-2015 American National Standard for Wet Process Porcelain Insulators Strain Type Secretariat: National Electrical Manufacturers Association Approved:
2、 July 30, 2015 Published: September 17, 2015 American National Standards Institute, Inc. 2015 National Electrical Manufacturers Association NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of persons engaged in the development and approval o
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20、ed States of America ANSI/NEMA C29.4-2015 Page ii 2015 National Electrical Manufacturers Association FOREWORD (This Foreword is not part of American National Standard C29.4-2015) This standard for strain-type wet-process porcelain insulators covers specifications on materials and dimensions, togethe
21、r with tests on materials and measurement of flashover value. The first edition of this standard was based essentially on the EEINEMA (Edison Electric InstituteNational Electrical Manufacturers Association) standards for Wet-Process Porcelain Insulators (Strain Type), EEI TDJ-54, NEMA 142-1952. Subs
22、equent revisions have been developed by the Standards Committee on Insulators for Electric Power Lines, C29. The principal differences between this edition and the previous (1989) edition are revisions to the color and marking requirements, inclusion of U.S. customary units in the Table of Dimension
23、s, and a change in the acceptance criteria for the transverse strength test. Suggestions for improvement of this standard are welcomed. They should be sent by the date of its next scheduled revision (December 31, 2020) to: Senior Technical Director, Operations National Electrical Manufacturers Assoc
24、iation 1300 North 17th Street, Suite 900 Rosslyn, VA 22209 This standard was processed and approved for submittal to ANSI by Accredited Standards Committee (ASC) on Insulators for Electric Power Lines, C29. Committee approval of the standard does not necessarily imply that all committee members vote
25、d for approval. At the time it approved this standard, the ASC C29 Committee had the following members: A. Jagtiani, Chairman G. Winstanley, Secretary Organization Represented: Name of Representative: Edison Electric Institute E. Cleckley B. Freimark M. Garrels R. Kluge K. Reese M. Gray (alt) D. Mar
26、 (alt) T. Rao (alt) A. Shkuratkov (alt) Institute of Electrical and Electronic Engineers T. Grisham N. DeSantis A. Jagtiani J. Kuffel T. Shaw J. George (alt) J. Varner (alt) ANSI/NEMA C29.4-2015 Page iii 2015 National Electrical Manufacturers Association Organization Represented: Name of Representat
27、ive: National Electrical Manufacturers Association A. Baker R. Bernstorf A. Schwalm T. Van Remmen G. Stewart E. Niedospial (alt) P. Maloney (alt) Bonneville Power Administration D. Liebhaber J. Havel (alt) Tennessee Valley Authority J. Nelson R. Stargel (alt) Western Area Power Administration R. Cla
28、rk ANSI/NEMA C29.4-2015 Page iv 2015 National Electrical Manufacturers Association Contents Foreword . ii 1 Scope 1 2 Referenced Standards 1 3 Definitions 1 4 General . 1 5 Material . 1 6 Dimensions and Characteristics 1 7 Marking . 2 8 Sampling, Inspection, and Tests . 2 8.1 General 2 8.2 Design Te
29、sts . 2 8.2.1 Low-Frequency Dry Flashover Test 2 8.2.2 Low-Frequency Wet Flashover Test . 2 8.3 Quality Conformance Tests . 2 8.3.1 Dimensional Test . 3 8.3.2 Visual Test . 3 8.3.3 Porosity Test 3 8.3.4 Tensile-Strength Test 3 Appendix 8 Figures Figure 1 Strain Insulator, Class 54-1 4 Figure 2 Strai
30、n Insulator, Class 54-2 5 Figure 3 Strain Insulator, Class 54-3 6 Figure 4 Strain Insulator, Class 54-4 7 Table Table 1 Metric Equivalents 2 ANSI/NEMA C29.4-2015 Page 1 2015 National Electrical Manufacturers Association 1 Scope This standard covers strain-type insulators made of wet-process porcelai
31、n and used in the transmission and distribution of electric energy. 2 Referenced Standards This standard is intended for use in conjunction with the latest approved revisions of the following standards: ANSI C29.1 Test Methods for Electrical Power Insulators ASTM D 1535-80 Standard Practice for Spec
32、ifying Color by the Munsell System 3 Definitions See Section 2 of ANSI C29.1 for definitions of terms. 4 General 4.1 Insulators shall conform in all respects to the requirements of this standard. The text and figures supplement each other and shall be considered part of this standard. 4.2 Manufactur
33、ers drawings, if furnished, shall show the outline of the insulators, together with all pertinent dimensions. Any variations in these dimensions due to manufacturing tolerances shall be indicated. 4.3 When specified in the clauses below, the following re-test procedure applies: If only one insulator
34、 fails to comply with the applicable test, a new sample equal to twice the quantity originally submitted to that test shall be subjected to retesting. If two or more insulators fail to comply, or if any failure occurs during the retesting, the complete lot is considered as not complying with the req
35、uirements of this standard. 5 Material 5.1 The insulators shall be made of commercial-grade wet-process porcelain that meets the mechanical and electrical requirements of this standard. 5.2 The surface of the shells exposed after the assembly shall be glazed for porcelain insulators. NOTEThe most co
36、mmon color requested for porcelain is gray. If gray is required, it shall be in accordance with ASTM D 1535, and shall conform to Munsell notation 5BG 7.0/0.4 with the following tolerances: a) Hue: 12(3G to 7B) b) Value: 0.5 c) Chroma: -0.2 to +0.6 Other colors are available and can be negotiated be
37、tween purchaser and supplier 6 Dimensions and Characteristics 6.1 Figures 1-4 (see pages 4-7) are drawings of insulator types. Dimensions and characteristics of the insulators shall be in accordance with these figures. 6.2 All dimensions and other numerical values are given in customary English unit
38、s. Except as otherwise stated, metric equivalents shall be as shown in Table 1. ANSI/NEMA C29.4-2015 Page 2 2015 National Electrical Manufacturers Association Table 1 Metric Equivalents Inches Millimeters Inches Millimeters 1/16 1.6 3 76 3.2 3 79 6 3 86 16 3 89 22 41/16 103 1 25.4 4 108 1 41 4 115 1
39、 44 1 48 5 140 2 54 6 172 2 57 2 60 7 178 2 64 2 67 2 73 NOTEThese equivalents are for use in converting dimensions given in this standard only. 7 Marking Each insulator shall include markings to identify: manufacturer, the ANSI class number or catalog number, and a time/lot reference (as a minimum,
40、 the month and year that the item was produced). The marking shall be legible and durable. 8 Sampling, Inspection, and Tests 8.1 GENERAL Tests described in 8.2 shall be required only on Insulators of new designs. Tests described in 8.3 shall be required on each lot of insulators. 8.2 DESIGN TESTS 8.
41、2.1 Low-Frequency Dry Flashover Test Three insulators shall be selected at random and tested in accordance with Section 4.2 of ANSI C29.1, “Low-Frequency Dry Flashover Voltage Tests.” Failure of the average dry flashover value of the three insulators to equal or exceed 95% of the rated dry flashover
42、 value, as given in the applicable figure, shall constitute failure to meet the requirements of this standard. 8.2.2 Low-Frequency Wet Flashover Test Three insulators shall be selected at random and tested in accordance with 4.3 of ANSI C29.1, “Low-Frequency Wet Flashover Tests.” Failure of the aver
43、age wet flashover value of the three insulators to equal or exceed 90% of the rated wet flashover value, as given in the applicable figure, shall constitute failure to meet the requirements of this standard. 8.3 QUALITY CONFORMANCE TESTS ANSI/NEMA C29.4-2015 Page 3 2015 National Electrical Manufactu
44、rers Association 8.3.1 Dimensional Test Three insulators shall be selected at random from the lot and their dimensions checked against the dimensions on the manufacturers drawing. Failure of one or more of these insulators to conform, within manufacturing tolerances, to the dimensions on this drawin
45、g shall constitute failure of the lot to meet the requirements of this standard. 8.3.2 Visual Test If visual inspection is required on lots of 500 or more insulators, 50 insulators shall be selected at random from the lot. If more than four but fewer than 10 of the insulators fail to meet the requir
46、ements of 5.2, 100 additional insulators shall be selected at random from the same lot. Failure of more than a total of 10 insulators from both the first and second samples shall constitute failure of the lot to meet the requirements of this standard. 8.3.3 Porosity Test A minimum of three specimen
47、samples shall be selected from insulators destroyed in other tests and tested in accordance with 5.4 of ANSI C29.1, “Porosity Test.” Penetration of the dye into the body of the dielectric shall constitute failure of the lot to meet the requirements of this standard. 8.3.4 Tensile-Strength Test Five
48、insulators shall be randomly selected and tested in accordance with 5.1.5 of ANSI C29.1, “Strain Insulators (Tensile Strength).” Failure of any one or more of the five insulators to meet the strength requirements given in the applicable figure shall constitute failure of the lot to meet the requirem
49、ents of this standard. The re-test procedure in section 4.3 is applicable to this test. ANSI/NEMA C29.4-2015 Page 4 2015 National Electrical Manufacturers Association 1 3 / 4 d2 1 / 2 M A X3 1 / 221/ 21 3 / 4 c 5 / 8 cALLOWABLE VARIATIONS: The letters appearing on the figure above stand for the following tolerances. A single letter indicates a plus or minus tolerance; for example, c = 1/16 in. c = 1/16 in. d = in. NOTES: (1) All dimensions are in inches. (2) The longitudinal radius in the load-bearing areas shall
