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1、 ANSI/NEMA CC 1 ANSI/NEMA CC 1 ELECTRIC POWER CONNECTION FOR SUBSTATIONS -,-,- -,-,- Approved as an American National Standard ANSI Approval Date: September 27, 2005 NEMA Standards Publication CC 1-2005 Electric Power Connection for Substations Published by: National Electrical Manufacturers Associa
2、tion 1300 North 17th Street Rosslyn, Virginia 22209 www.nema.org Copyright 2005 by the National Electrical Manufacturers Association. All rights including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Arti
3、stic Works, and the International and Pan American Copyright Conventions. -,-,- NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of persons engaged in the development and approval of the document at the time it was developed. Consensus does
4、not necessarily mean that there is unanimous agreement among every person participating in the development of this document. The National Electrical Manufacturers Association (NEMA) standards and guideline publications, of which the document contained herein is one, are developed through a voluntary
5、 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 process and establishes rules to promote fairness in the development of consensus, it does
6、 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 publications. NEMA disclaims liability for any personal injury, property, or other damages of any
7、 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 and makes no guaranty or warranty, expressed or implied, as to the accuracy or completeness of any i
8、nformation 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 performance of any individual manufacturer or sellers products or services by virtue of this standard
9、 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 any duty owed by any person or entity to someone else. Anyone using this document should rely on
10、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 standards on the topic covered by this publication may be available from other sources, which the user
11、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 does not certify, test, or inspect products, designs, or installations for safety or health purpo
12、ses. Any certification or other statement of compliance with any health or safety related information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. -,-,- CC 1-2005 Page i Copyright 2005 by the National Electrical Manuf
13、acturers Association. CONTENTS Page Foreword.ii Section 1 GENERAL1 1.1 Scope1 1.2 References1 1.3 Definitions .2 Section 2 REQUIREMENTS5 2.1 Current Ratings for Bare Copper Conductors and Tubing5 2.2 Current Ratings for Aluminum Conductors and Pipe Conductors7 2.3 EHV and UHV Power Connectors 9 2.4
14、Frequency.9 2.5 Temperature Rise (See 3.1.) 9 2.6 Pullout Strength (See 3.2.).10 2.7 Cantilever Strength of Bus Supports (See 3.4.)10 2.8 Torque Strength of Bolted Connectors .10 2.9 Aluminum Weldment Couplers .10 Section 3 TEST METHODS.11 3.1 Temperature Rise Tests .11 3.2 Pullout Strength Tests.12
15、 3.3 Corona and RIV Tests 12 3.4 Cantilever Strength of Bus Supports.14 3.5 Torque Strength Test of Bolted Connectors .15 3.6 Tensile Test of Welded Couplers15 3.7 Bending Test of Welded Couplers15 Section 4 DESIGN AND MARKING REQUIREMENTS16 4.1 Clamping Fasteners for Connectors.16 4.2 Identificatio
16、n Marking16 4.3 Designation of Connector Sizes16 4.4. Thread Dimensions for Stud Terminal Connectors.17 4.5 Bolt Holes for Terminal Connectors with Single Tangs or Multiple Flat Bar Tangs17 4.6 Conductor Clamping Bolts for Connectors .17 4.7 Tensile Strength of Bolts.22 4.8 Expansion Connectors22 4.
17、9 Terminal Connectors.22 4.10 Flat Plain Washers 23 4.11 Dimensional Requirements for Bus Supports and Offset Pad Connectors.23 4.12 Recommendation for Making Connections .25 4.13 Tongue Mounting Fasteners .26 Annex A NEMA STANDARDS PUBLICATION NO. 107-1987 (1993) .27 Annex B BOLT HOLES FOR TERMINAL
18、 CONNECTORS46 Annex C BOLT HOLES FOR TERMINAL CONNECTORS USED IN OTHER COUNTRIES .48 -,-,- CC 1-2005 Page ii Copyright 2005 by the National Electrical Manufacturers Association. Foreword The purpose of this publication is to provide standard test methods and performance requirements for the electric
19、al and mechanical characteristics of connectors under normal operating conditions. User needs in the development of this Standards Publication have been recognized through the normal marketing determination of customer acceptance done by individual NEMA members, and through the procedures inherent i
20、n its approval as an American National Standard. The Electrical Connector Section of NEMA, in its constant review of the publication, continues to seek out the views of responsible users, which will contribute to the development of better standards. These standards are periodically reviewed by the E
21、lectrical Connector Section for any revisions necessary to keep them up to date with advancing technology. Proposed or recommended revisions are welcome and should be submitted to: Vice President, Technical Services National Electrical Manufacturers Association 1300 North 17th Street Rosslyn, Virgin
22、ia 22209 This Standards Publication was developed by the Electrical Connector Section of the National Electrical Manufacturers Association. At the time it was approved, the Electrical Connector Section had the following members: Greg Nienaber, Chairman Vince Baclawski, Secretary Organization Represe
23、nted: Name of Representative: Sicame Corporation Scott Casler Tyco Electronics/AMP Mark E. Johnson FCI USA Inc. Alan Beck Connector Manufacturing Company Greg T. Nienaber ILSCO Corporation David Fitzgibbon Thomas =1.2 for 4-conductor bundles ln = natural logarithm. Figure 3-2 CONDUCTOR VOLTAGE GRADI
24、ENT FOR SINGLE CONDUCTOR Figure 3-3 CONDUCTOR VOLTAGE GRADIENT FOR BUNDLED CONDUCTOR -,-,- CC 1-2005 Page 14 Copyright 2005 by the National Electrical Manufacturers Association. Figure 3-4 LINE TO GROUND VOLTAGE FOR SINGLE CONDUCTOR (THREE PHASE) Figure 3-5 LINE TO GROUND VOLTAGE FOR BUNDLED CONDUCT
25、OR (THREE PHASE) 3.3.3 Observations for Visual Corona Observations for visual corona shall be made in a darkened area after the eye has adapted to the dark. Binoculars or image amplification equipment can be used to locate and observe the presence or absence of positive corona, neglecting any negati
26、ve glow corona, as only the positive corona contributes significantly to the radio noise. A voltage up to 30% above the test voltage shall be applied to establish the critical corona location, if any. The corona extinction voltage shall be observed as the voltage is decreased. 3.3.4 RIV Measurements
27、 RIV measurements shall be made in accordance with the NEMA Standards Publication No. 107-1987 (1993), Methods of Measurement of Radio Influence Voltage (RIV) of High Voltage Apparatus (see Annex A). RIV measurements may be omitted if the test set-up allows complete visual observation and all source
28、s of corona have been identified. 3.4 CANTILEVER STRENGTH OF BUS SUPPORTS The cantilever strength shall be determined by applying a load at the centerline of the conductor, transverse to the conductor longitudinal axis. The bus support shall be bolted to a flat surface, using the hardware recommende
29、d by the manufacturer. -,-,- CC 1-2005 Page 15 Copyright 2005 by the National Electrical Manufacturers Association. 3.5 TORQUE STRENGTH TEST OF BOLTED CONNECTORS The conductor(s) shall be assembled in the connector and the bolts tightened uniformly and alternately in 11.3 N-m (100 lb-in.)increments
30、until 50% over the nominal torque value is achieved (see 4.6). 3.6 TENSILE TEST OF WELDED COUPLERS The spliced conductor, with the coupler in between, shall be fastened in a tensile testing machine and a load shall be applied at a crosshead speed not exceeding 20.8 mm per minute per meter (1/4 in. p
31、er minute per foot) of sample length 3.7 BENDING TEST OF WELDED COUPLERS A load shall be applied at two points, at a distance of 76.2 mm (3 in.) from the weld and transverse to the conductor longitudinal axis. The conductor shall be freely supported at each end. -,-,- CC 1-2005 Page 16 Copyright 200
32、5 by the National Electrical Manufacturers Association. Section 4 DESIGN AND MARKING REQUIREMENTS 4.1 CLAMPING FASTENERS FOR CONNECTORS 4.1.1 Clamping Fasteners for Copper Electric Power Connectors Clamping fasteners for copper electric power connectors shall meet the requirements of the American Na
33、tional Standard for Square and Hex Bolts and Screws, Including Askew Head Bolts, Hex Cap Screw and Lag Screws, ASME B18.2.1, and Square and Hex Nuts, ASME B18.2.2. Washers shall meet the requirements of the American National Standard for Plain Washers, ASME B18.22.1. Lock washers are optional and, i
34、f used, shall meet the requirements of the American National Standard for Lock Washers, ASME B18.21.1. 4.1.2 Clamping Fasteners for Aluminum Electric Power Connectors Clamping fasteners for aluminum electric power connectors shall meet the requirements of the American National Standard for Hex Bolts
35、 and Screws, Including Askew Head Bolts, Hex Cap Screw and Lag Screws, ASME B18.21.1, and Square and Hex Nuts, ASME B18.2.2. Flat washers shall meet the requirements of the American National Standard, ASME B18.22.1. Lock washers shall meet the requirements of the American National Standard, ASME B18
36、.21.1. Bolts, nuts, or both, shall be treated to prevent galling. 4.2 IDENTIFICATION MARKING The following minimum amount of information shall be given on all electric power connectors: a) Manufacturers designation. b) Nominal size or range of sizes of the conductors with which the connector is inte
37、nded to be used. 4.3 DESIGNATION OF CONNECTOR SIZES The size of an electric power connector shall be designated in terms of the size, or other sizes of conductors which the connector accommodates. The size of conductors shall be given in the following terms: a) For wire and cablein American Wire Gau
38、ge (AWG) sizes or thousands of circular mils (kcmil) Reference is also made to the equivalent metric (mm2) sizes for AWG or kcmil series conductors. b) For tubingin nominal pipe size (NPS) or iron pipe size (IPS) which includes standard (SPS or SCH 40) and extra heavy (EHPS or SCH 80) sizes, except
39、for expansion or internal connectors. The connector marked NPS or IPS indicates that it is designed to accommodate both SPS (SCH 40) and EHPS (SCH 80). Special marking is required if the connector is limited to SPS (SCH 40) or EHPS (SCH 80) only. -,-,- CC 1-2005 Page 17 Copyright 2005 by the Nationa
40、l Electrical Manufacturers Association. 4.4. THREAD DIMENSIONS FOR STUD TERMINAL CONNECTORS The thread dimensions for internal threaded stud terminal connectors intended for use with electrical equipment shall be as shown in Table 4-1. Table 4-1 STANDARD THREADS FOR STUD TERMINALS Stud Diameter Numb
41、er of Connector in. mm* Threads per in. Thread Class 5/8 15.9 11 UNC-2B -3/4 19.0 16 UNF-2B 1 25.4 14 UNS-2A 1-1/8 28.6 12 UNF-2B 1-1/4 31.8 12 UNF-2B 1-1/2 38.1 12 UNF-2B 2 50.8 12 UN-2B 2-1/2 63.5 12 UN-2B 3 76.2 12 UN-2B * For reference only 4.5 BOLT HOLES FOR TERMINAL CONNECTORS WITH SINGLE TANG
42、S OR MULTIPLE FLAT BAR TANGS The dimensions and the arrangement of bolt holes in the tangs of power connectors shall be as shown in Annex B, Figure B-1 to B-6. Figures B-7 to B-9 show the typical spacing for multiple flat bar tangs. Metric terminal pad spacing and sizes used in some countries other
43、than the U.S. are given for information in Annex C. 4.6 CONDUCTOR CLAMPING BOLTS FOR CONNECTORS 4.6.1 General Bronze alloy bolts shall be used on copper alloy connectors and aluminum alloy bolts shall be used on aluminum alloy conductors. Alternate alloy, including Steel or Stainless steel, material
44、s shall be permitted to be used for bolts if performance requirements are met and no adverse material compatibility or galling of threads occurs and approved by the manufacturer. 4.6.2 Number and Diameter of Conductor Clamping Bolts The number and diameter of clamping bolts for connectors are listed
45、 in Table 4-2. -,-,- CC 1-2005 Page 18 Copyright 2005 by the National Electrical Manufacturers Association. 4.6.2.1 U Bolts (See Figure 4-1) Each U bolt shall count as two bolts. Figure 4-1 U- BOLT TYPE CONNECTOR 4.6.2.2 Shackles (See Figure 4-2) Each bolt of a single casting, wrap-around conductor
46、shackle design shall count as two bolts. Figure 4-2 SHACKLE TYPE CONNECTOR 4.6.2.3 Different Sizes of Conductors When two different sizes of conductors are involved, the bolts specified for the smaller conductor shall be permitted to be used. 4.6.2.4 Exception when three bolts are specified When thr
47、ee bolts are specified, the following exceptions shall apply: a) Terminal lugs shall have a minimum of four bolts or the equivalent for a single conductor. b) Stud connectors shall have a minimum of four bolts or the equivalent for the stud portion. -,-,- CC 1-2005 Page 19 Copyright 2005 by the Nati
48、onal Electrical Manufacturers Association. Table 4-2 CONNECTOR CLAMPING BOLTS U.S. STANDARD CONDUCTORS AND HARDWARE Type of Conductor For Copper Conductors For Aluminum or ACSR Conductors Bolts Per Conductor Bolts per Conductor Single Size Standard Duty Single Size Heavy Duty Range Taking Range Taking* Single Size 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Standard Pipe S