1、 IEEE Standard Power Cable Ampacity Tables Amendment 1: Revision to Introduction Sponsored by the Insulated Conductors Committee IEEE 3 Park Avenue New York, NY 10016-5997 USA 11 January 2013 IEEE Power and Energy Society IEEE Std 835a-2012 (Amendment to IEEE Std 835-1994) IEEE Std 835a-2012 (Amendm
2、ent to IEEE Std 835-1994) IEEE Standard Power Cable Ampacity Tables Amendment 1: Revision to Introduction Sponsor Insulated Conductors Committee of the IEEE Power and Energy Society Approved 5 December 2012 IEEE-SA Standards Board Abstract: Corrections to the introduction for the standard with over
3、3000 ampacity tables for extruded dielectric power cables rated through 138 kV and laminar dielectric power cables rated through 500 kV are addressed in this amendment. Keywords: ampacity, cable, dielectric, extruded, IEEE 835, laminar, power The Institute of Electrical and Electronics Engineers, In
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18、articipants At the time this IEEE standard was completed, the Ampacity Topics Working Group had the following membership: David Purnhagen, Chair Todd Goyette, Vice ChairThe following members of the individual balloting committee voted on this standard. Balloters may have voted for approval, disappro
19、val, or abstention. Roy Alexander Thomas Barnes Earle Bascom III Robert Beavers William Bloethe Kenneth Bow Kent Brown Nissen Burstein William Byrd Robert Christman Frank Di Guglielmo Gary Donner Gearold O H Eidhin Frank Gerleve David Gilmer Todd Goyette Randall Groves Ajit Gwal Richard Harp Jeffrey
20、 Hartenberger Timothy Hayden Jeffrey Helzer Lee Herron Lauri Hiivala Werner Hoelzl Dennis Johnson A. Jones Gael Kennedy Yuri Khersonsky Richard Kolich Albert Kong Edwin Kramer Jim Kulchisky Saumen Kundu Chung-Yiu Lam Michael Lauxman Russell Lowe Greg Luri Daniel Mainstruck Arturo Maldonado John Mcal
21、haney Jr. John Merando Rachel Mosier Jerry Murphy Michael S. Newman Charles Ngethe Joe Nims Lorraine Padden Moises Ramos Brieana Reed-Harmel Jesse Rorabaugh Bartien Sayogo Gil Shultz Michael Smalley Jerry Smith Nagu Srinivas Gregory Stano Gary Stoedter David Tepen Peter Tirinzoni Nijam Uddin John Ve
22、rgis Martin Von Herrmann Carl Wall Kenneth White Jian Yu Dawn Zhao Tiebin Zhao J. ZimnochCopyright 2013 IEEE. All rights reserved. vii When the IEEE-SA Standards Board approved this standard on 5 December 2012, it had the following membership: Richard H. Hulett, Chair John Kulick, Vice Chair Robert
23、M. Grow, Past Chair Konstantinos Karachalios, Secretary Satish Aggarwal Masayuki Ariyoshi Peter Balma William Bartley Ted Burse Clint Chaplin Wael Diab Jean-Philippe Faure Alexander Gelman Paul Houz Jim Hughes Young Kyun Kim Joeseph L. Koepfinger* David J. Law Thomas Lee Hung Ling Oleg Logvinov Ted
24、Olsen Gary Robinson Jon Walter Rosdahl Mike Seavy Yatin Trivedi Paul Winston Yu Yuan *Member Emeritus Also included are the following nonvoting IEEE-SA Standards Board liaisons: Richard DeBlasio, DOE Representative Michael Janezic, NIST Representative Michelle Turner IEEE Standards Program Manager,
25、Document Development Malia Zaman IEEE Standards Program Manager, Technical Program Development Copyright 2013 IEEE. All rights reserved. viii Introduction This introduction is not part of IEEE Std 835a-2012, IEEE Standard Power Cable Ampacity TablesAmendment 1: Revision to Introduction. The publicat
26、ions AlEE S-135-1, Power Cable Ampacities Volume 1 Copper Conductors and S-135-2, Power Cable Ampacities Volume 2 Aluminum Conductors (IPCEA P-46-426) have often been referred to as the “black books” and have been used by engineers, planners, and system designers throughout the world. For over 30 ye
27、ars, these publications were the only complete document on power cable ampacities in the United States. In 1976, the Insulated Conductors Committee, in cooperation with the Insulated Cable Engineers Association (ICEA) and the National Electrical Manufacturers Association (NEMA), published supplement
28、al ampacity tables to provide ampacity ratings for single conductor cables with shield losses due to circulating currents. That publication was needed due to the tremendous increase in the use of single conductor extruded dielectric cables with multiple point bonding and grounding. As time passed, n
29、ew cable designs were developed with synthetic insulation, different shielding designs and higher operating voltages and temperatures. Moreover, new technology and equipment was developed for measuring the thermal properties of soil. These developments with heat transfer in soils provided a differen
30、t understanding and approach for rating cables based on maximum cable/earth interface temperature. In addition, new forced convection heat transfer analytical methods were employed for cables in air, which provided for less conservative ampacity ratings. The tables in this standard reflect these cha
31、nges in methodology and provide the user with a vast array of cable ampacity ratings for 600 V utilization cables, medium voltage distribution cable and high voltage transmission cables. This amendment provides corrections for the original standard. The amendment corrects discrepancies between formu
32、las and the text discussing the use of the formula and also provides additional definitions where required. Copyright 2013 IEEE. All rights reserved. ix Contents 3. Technical features of the tables2 3.4 Adjustments for change in parameter 2 3.5 Method of Calculation . 2 Annex A (normative) Electrica
33、l/thermal circuit . 4 Copyright 2013 IEEE. All rights reserved. 1 IEEE Standard Power Cable Ampacity Tables Amendment 1: Revision to Introduction IMPORTANT NOTICE: IEEE Standards documents are not intended to ensure safety, health, or environmental protection, or ensure against interference with or
34、from other devices or networks. Implementers of IEEE Standards documents are responsible for determining and complying with all appropriate safety, security, environmental, health, and interference protection practices and all applicable laws and regulations. This IEEE document is made available for
35、 use subject to important notices and legal disclaimers. These notices and disclaimers appear in all publications containing this document and may be found under the heading “Important Notice” or “Important Notices and Disclaimers Concerning IEEE Documents.” They can also be obtained on request from
36、 IEEE or viewed at http:/standards.ieee.org/IPR/disclaimers.html. NOTEThe editing instructions contained in this corrigendum define how to merge the material contained therein into the existing base standard and its amendments to form the comprehensive standard. The editing instructions are shown in
37、 bold italic. Four editing instructions are used: change, delete, insert, and replace. Change is used to make corrections in existing text or tables. The editing instruction specifies the location of the change and describes what is being changed by using strikethrough (to remove old material) and u
38、nderscore (to add new material). Delete removes existing material. Insert adds new material without disturbing the existing material. Insertions may require renumbering. If so, renumbering instructions are given in the editing instruction. Replace is used to make changes in figures or equations by r
39、emoving the existing figure or equation and replacing it with a new one. Editing instructions, change markings, and this NOTE will not be carried over into future editions because the changes will be incorporated into the base standard.11Notes in text, tables, and figures of a standard are given for
40、 information only and do not contain requirements needed to implement this standard. IEEE Std 835a-2012 IEEE Standard Power Cable Ampacity Tables Amendment 1: Revision to Introduction Copyright 2013 IEEE. All rights reserved. 2 3. Technical features of the tables 3.4 Adjustments for change in parame
41、ter 3.4.2 Adjustment for change in maximum conductor temperature rise due to dielectric loss Insert the following definition into the where list on Page-Intro-10: I is adjusted ampacity for new maximum conductor temperature and new temperature rise Change first sentence of second paragraph on Page-I
42、ntro 10 as follows: When ccTT ccTT the above formula will give conservative values since it is based on the ratio of direct current losses at two temperatures while the ratio of the alternating-current conductor and shield losses (if any) to direct-current conductor losses decreases with increasing
43、temperature. 3.5 Method of Calculation 3.5.1 Single phase cables Insert the following definitions on page Intro-11 Qsis the ratio of the sum of conductor and shield or sheath losses to conductor losses Rsis the resistance of the cable sheath or shield (/ft) Rdcis the dc resistance of the conductor (
44、 /ft) 3.5.6 Horizontal cables in air Change the introductory sentence to the equations on Page Intro-13 as follows: The external thermal resistance (dsR) (eR ) for horizontal cables or conduit in air is calculated using the following equations: Replace Equation (6) with the following: TOFWWTnRrce+=
45、IEEE Std 835a-2012 IEEE Standard Power Cable Ampacity Tables Amendment 1: Revision to Introduction Copyright 2013 IEEE. All rights reserved. 3 3.5.7 Vertical cables in air Change the introductory sentence to the equations on Page Intro-14as follows: The internal thermal resistance (dsR) (sdR ) betwe
46、en cable surface and riser conduit surface is calculated using the following equations: Change the definition in the where list Page Intro-14, for equation (10) as follows: n n = number of conductors within a stated diameter Replace the equation for Grashof number, Gr, on Page Intro-14 with the foll
47、owing: 23*fkTxgGr= Change the definition in where list for Cpon Page Intro-15 as follows: Cpis specific heat or of air Replace the equation for *Grxon Page Intro-16 with the following: 24*fkwxkxqgGr= IEEE Std 835a-2012 IEEE Standard Power Cable Ampacity Tables Amendment 1: Revision to Introduction C
48、opyright 2013 IEEE. All rights reserved. 4 Annex A (normative) Electrical/thermal circuit A.2 Calculation Examples A.2.2 Example 2: 3-1/c 250 kcmil aluminum, 35 kV, wire shielded, XLPE cables installed in separate 3 inch PVC conduits, buried flat Change the sentence on Page Intro-26 as follows: 3-1/
49、c 250 kcmil aluminum conductor cables, 35 kV, cross-linked polyethylene insulation (0.345 inch wall), 12#14 AWG copper concentric wire shield, with 0.080 inch PVC jacket over each cable A.2.3 Example 3: 3-1/c 2000 kcmil copper, 15 kV, tape shielded, EPR cables installed in a 6 inch PVC in still air Replace the values of fand fon Page Intro-40 with the following: f= 0.0672 lb/ft3 sea level tff= 0.0478 lb/h tfA.2.4 Example 4: 1-1/c #1/0 AWG aluminum 15 k
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