NEMA C29 5-2015 Wet-Process Porcelain Insulators Low- and Medium-Voltage Types.pdf

1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI/NEMA C29.5-2015Wet-Process Porcelain Insulators Low- and Medium-Voltage TypesANSI/NEMA C29.5-2015 American National Standard for Wet-Process Porcelain Insulators Low- and Medium-Voltage Types Secretariat: National Electrical

2、 Manufacturers Association Approved: July 30, 2015 Published: September 22, 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 engag

3、ed 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 guideline publicatio

4、ns, 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 administers the proces

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12、e statement. ANSI/NEMA C29.5-2015 Page i 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 th

13、e judgment of the 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 tha

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18、blished by National Electrical Manufacturers Association 1300 North 17th Street, Suite 900, Rosslyn, Virginia 22209 2015 National Electrical Manufacturers Association All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for t

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20、erica ANSI/NEMA C29.5-2015 Page ii 2015 National Electrical Manufacturers Association FOREWORD (This Foreword is not part of American National Standard C29.5-2015) The first edition of this standard was based essentially on the EEINEMA (Edison Electric Institute-National Electrical Manufacturers Ass

21、ociation) standards for Wet-Process Porcelain Insulators (Low- and Medium-Voltage Pin Type), EEI TDJ-55, NEMA 143-1952. Subsequent revisions have been developed by the Standards Committee on Insulators for Electric Power Lines, C29. The principal differences between this edition and the previous (19

22、84) edition are revisions to the color and marking requirements, addition of more specific requirements for conductor groove dimensions, and a change in the acceptance criteria for the cantilever strength test. Suggestions for improvement of this standard are welcomed. They should be sent by the dat

23、e of its next scheduled revision (December 31, 2020) to: Senior Technical Director, Operations National Electrical Manufacturers Association 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 I

24、nsulators for Electric Power Lines, C29. Committee approval of the standard does not necessarily imply that all committee members voted for approval. At the time it approved this standard, the ASC C29 Committee had the following members: A. Jagtiani, Chairman G. Winstanley, Secretary Organization Re

25、presented: Name of Representative: Edison Electric Institute E. Cleckley B. Freimark M. Garrels R. Kluge K. Reese M. Gray (alt) D. Mar (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. Varne

26、r (alt) ANSI/NEMA C29.5-2015 Page iii 2015 National Electrical Manufacturers Association Organization Represented: Name of Representative: National Electrical Manufacturers Association A. Baker R. Bernstorf A. Schwalm T. Van Remmen G. Stewart E. Niedospial (alt) P. Maloney (alt) Bonneville Power Adm

27、inistration D. Liebhaber J. Havel (alt) Tennessee Valley Authority J. Nelson R. Stargel (alt) Western Area Power Administration R. Clark ANSI/NEMA C29.5-2015 Page iv 2015 National Electrical Manufacturers Association Contents Foreword . ii 1 Scope 1 2 Referenced Standards 1 3 Definitions 1 4 General

28、 . 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 Tests 2 8.2.1 Low-Frequency Dry Flashover Test 2 8.2.2 Low-Frequency Wet Flashover Test . 2 8.2.3 Critical Impulse Flashover TestsPositive and Negative . 3 8.2.4 Radi

29、o-Influence Voltage Test 3 8.2.5 Cantilever-Strength Test . 3 8.2.6 Thermal Shock Test 3 8.3 Quality Conformance Tests 3 8.3.1 Dimensional Test . 3 8.3.2 Visual Test . 3 8.3.3 Porosity Test 3 8.3.4 Pinhole-Gauging Test 3 8.3.5 Puncture Test 4 8.4 Routine Test (Flashover Test) 4 Appendix . 13 Figures

30、 Figure 1 Pin Insulator, Class 55-1 5 Figure 2 Pin Insulator, Class 55-2 6 Figure 3 Pin Insulator, Class 55-3 7 Figure 4 Pin Insulator, Class 55-4 8 Figure 5 Pin Insulator, Class 55-5 9 Figure 6 Pin Insulator, Class 55-6 10 Figure 7 Pin Insulator, Class 55-7 11 Figure 8 Insulator Thread Gauge . 12 T

31、able Table 1 Neck Designations and Dimensions 2 ANSI/NEMA C29.5-2015 Page 1 2015 National Electrical Manufacturers Association 1 Scope This standard covers low- and medium-voltagetype insulators made of wet-process porcelain and used in the transmission and distribution of electric energy. 2 Referen

32、ced Standards This standard is intended for use in conjunction with the latest approved revisions of the following American National Standards: ANSI C29.1 Test Methods for Electrical Power Insulators ANSI C29.6 Wet-Process Porcelain Insulators High-Voltage Pin Types ASTM D 1535 Standard Practice for

33、 Specifying 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 Manuf

34、acturers 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 insu

35、lator 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 th

36、e requirements 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. Note: The

37、most commonly requested color for porcelain is gray. If gray is required, it shall be in accordance with ASTM D 1535, Standard Practice for Specifying Color by the Munsell System, 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) C

38、hroma: -0.2 to +0.6 Other colors are available and can be negotiated between purchaser and supplier. 6 Dimensions and Characteristics 6.1 Figures 1-7 are drawings of insulator types. Dimensions and characteristics of the insulators shall be in accordance with these figures. ANSI/NEMA C29.5-2015 Page

39、 2 2015 National Electrical Manufacturers Association 6.2 When specified, neck designations shall be as shown in Table 1. All surfaces that might come in contact with conductors or tie wires must be rounded to prevent abrasion, cracking, or metal fatigue. The minimum depth of the top conductor groov

40、e shall be 0.5 inches for Class 55-2 and Class 55-3 insulators. It shall be 0.6 inches for Class 55-4 and Class 55-5 insulators. It shall be 0.7 inches for Class 55-6 and Class 55-7 insulators. The length of the top conductor groove shall not exceed the maximum neck diameter by more than 0.12 inches

41、. 6.3 All dimensions and other numerical values are given in customary English units. Metric equivalents are given in parentheses for certain characteristics. Table 1 Neck Designations and Dimensions 7 Marking Each insulator shall include markings to identify: manufacturer, the ANSI class number or

42、catalog number, and a time/lot reference (as a minimum, 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

43、required on each lot of insulators. Tests described in 8.4 shall be made on each insulator. 8.2 DESIGN TESTS 8.2.1 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 Test.” Failure of the

44、 average dry flashover value of the three insulators to equal or exceed 95% of the rated dry flashover 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

45、 tested in accordance with Section 4.3 of ANSI C29.1, “Low-Frequency Wet Flashover Test.” Failure of the average 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 o

46、f this standard. Designation Diameter Groove-Height Relationship, as Applicable (in.) Diameter Groove-Height Relationship, as Applicable (mm) Letter (in.) Minimum Maximum (mm) Minimum Maximum A 1 - - 45 3 - - C 2 9/16 57 3 14 22 F 2 9/16 73 3 14 22 J 3 89 3 6 16 K 4 102 3 6 16 N 6 9/16 152 3 14 22 A

47、NSI/NEMA C29.5-2015 Page 3 2015 National Electrical Manufacturers Association 8.2.3 Critical Impulse Flashover Tests Positive and Negative Three insulators shall be selected at random for the critical impulse flashover test, positive, and three for the critical impulse flashover test, negative, and

48、tested in accordance with Section 4.7 of ANSI C29.1, “Impulse Flashover Voltage Tests.” Failure of the average critical impulse flashover value of the three insulators to equal or exceed 92% of the rated critical impulse flashover value, as given in the applicable figure, shall constitute failure to

49、 meet the requirements of this standard. 8.2.4 Radio-Influence Voltage Test Five insulators shall be selected at random and tested in accordance with Section 4.9 of ANSI C29.1, “Radio-Influence Voltage Tests.” If one or more insulators fails to meet the requirements given in the applicable figure, five additional insulators shall be selected at random and tested. Failure of one or more of these additional insulators shall constitute failure to meet the requirements of this standard. 8.2.5 Cantilever-Str