Links:
Heating
Wikipedia
Duct Bank Heating Calculations are Essential
Neher-McGrath Certifications
understanding ampacity
Understanding the Neher-McGrath Calculation
Correlations of Submersible Cable Performance
to Neher-McGrath Ampacity Calculations
Underground Installations – Not Rocket Science
ADVANCED THERMAL ANALYSIS OF UNDERGROUND POWER CABLES
Review of Power Cable
Standard Rating Methods
Linear Methods of Applied Mathematics
Heat equation
Heat Transfer Overview
Assessment of Hyperbolic Heat Transfer Equation in Theoretical Modeling for Radiofrequency Heating Techniques
References:
The following references were used for this website and may be useful to the reader for additional
background on the topics discussed.
1. J.H. Neher, M.H. McGrath, J.H. Neher, M.H. McGrath, "The Calculation of the Temperature
Rise and Load Capability of Cable Systems", Paper 57-660, AIEE Insulated Conductors
Committee, June 1957.
2. J.H. Neher, "The Transient Temperature Rise of Buried Cable Systems", Paper 63-917,
IEEE Insulated Conductors Committee, June 1963.
3. IEC-287, "Calculation of the Continuous Current Rating of Cables (100% Load Factor)",
International Electrotechnical Commission, 1982.
4. IEC-853-2, "Calculation of the Cyclic and Emergency Current Rating of Cables",
International Electrotechnical Commission, 1st Ed., 1989.
5. M.A. El-Kady, D.J. Horrocks, "Extended Values of Geometric Factor of External Thermal
Resistance of Cables in Duct Banks", IEEE Transactions on Power Apparatus and Systems,
Vol. PAS-104, 1995.
6. G.J. Anders, Rating of Electric Power Cables, IEEE Press/McGraw Hill, 1997.
7. J.A. Williams, T.R. Grave, E. Kallaur, "Uprating of High Pressure Gas-Filled Feeders by
Fluid Filling and Rapid Circulation", IEEE Conference, Anaheim, CA, September 15-19,
1986.
8. J.A. Williams, E.C. Bascom III, B. Horgan, T. Aabo, "Field Test Program and Results to
Verify HPFF Cable Rating", IEEE Transactions, 1991.
9. "The Calculation of Continuous Rating for Forced-Cooled High-Pressure Oil-Filled Pipe-
Type Cables", Working Group 21.08, Study Committee 21, Electra, No. 113, pp. 97-120.
10. "The Calculation of Continuous Ratings of Forced-Cooled Cable", Working Group 21.08,
Study Committee 21, Electra No. 66, pp. 59-84, October 1979.
11. J.P. Holman, Heat Transfer, 8th Edition, McGraw-Hill, New York, 1997.
12. K. Iizuka, Power Cable Technology Hand Book, DenkiShoin, Tokyo, 1974, pp. 80.
13. Transmission Cable Life Evaluation and Management, EPRI, September 1998. TR-111712.
14. Underground Transmission Systems Reference Book, EPRI, 1992. TR-101670.
15. E.C. Bascom, III, J.A. Williams, Ampacity Evaluation and Distributed Fiber Optic
Testing on Pipe-Type Cables Under Bridgeport Harbor, EPRI, December 2002.
Publication 1007534.
16. E.C. Bascom, III, J.H. Cooper, Condition and Power Transfer Assessment of
CenterPoint Energy's Polk-Garrott Pipe-Type Cable Circuit, EPRI, December 2002.
Publication 1007539.
17. J.A. Williams, Application of Fiber-Optic Temperature Monitoring to Solid Dielectric Cable,
EPRI, November 2000. Publication 1000469.
18. J.A. Williams, J.H. Cooper, Distributed Fiber Optic Temperature Monitoring and Ampacity
Analysis for XLPE Transmission Cables, EPRI, June 1998. TR-110630.
19. E.C. Bascom, III, J.A. Williams, M.A. Pasha, S.M. Rahman, W. Zenger, "Ampacity
Evaluation of High-Pressure Gas-Filled (HPGF) Pipe-Type Cables Under Bridgeport
Harbor", Transactions of IEEE PES Transmission & Distribution Conference, Paper
03TD0093, Dallas, Texas, 7-12 September 2003.
20. E.C. Bascom, III, "Underground Cable Uprating and Upgrading Tutorial", Transactions
of IEEE PES Transmission & Distribution Conference, Paper 03TD0362 (Panel Session),
Dallas, Texas, 7-12 September 2003.
21. W.D. Stevenson, Jr., Elements of Power System Analysis, 4th Ed., McGraw-Hill,
New York, 1982.
22. D.W. Purnhagen, Designer's Handbook for Forced-Cooled High-Pressure Oil-Filled
Pipe-Type Cable Systems, EPRI, EL-3624, Project 7801-5, July 1984.
23. Volume 1: Calculating AC/DC resistance Ratios for High-Pressure Oil-Filled Cable Designs
- Designer's Guide, EPRI, EL-3977, 1985.
24. Voume 2: Calculating AC/DC resistance Ratios for High-Pressure Oil-Filled Cable Designs
- Details of Mathematical Derivations, EPRI, EPRI EL-3977, 1985.
25. D. Parmar, J. Steinmanis, "Underground Cables Need a Proper Burial", Transmission &
Distribution World, April 2003, pp. 44-51.
26. E.C. Bascom, III, J.A. Williams, "Taking Your Cable's Temperature", Transactions of the
T&D World Expo, 7-9 May 2002, Indianapolis, Indiana.
27. Transmission Cable Life Evaluation and Management, EPRI, September 1998. TR-111712.
28. "The Calculation of Continuous Rating for Forced-Cooled High-Pressure Oil-Filled Pipe-
Type Cables", Working Group 21.08, Study Committee 21, Electra, No. 113, pp. 97-120.
29. "The Calculation of Continuous Ratings of Forced-Cooled Cable", Working Group 21.08,
Study Committee 21, Electra No. 66, pp. 59-84, October 1979.
30. Thermal Properties Manual for Underground Power Transmission, EPRI, November 1997.
TR-108919.
31. "IEEE Guide for Application of Sheath-Bonding Methods for Single- Conductor Cables
and the Calculation of Induced Voltages and Currents in Cable Sheaths", 575-1988.
32. E.C. Bascom, III, D.A. Douglass, G.C. Thomann, T. Aabo, "Hybrid Transmission:
Aggressive Use of Underground Cable Sections with Overhead Lines", CIGRE 1996,
21/22-10.
33. Increased Power Flow Guidebook – Overhead Transmission Lines, EPRI,
December 2002. 1001817.
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.: Professional Engineering
Neher-McGrath are specialized and complicated calculations. We highly suggest that all results and calculation be made under the guidance of and licence professional engineer that specializes in this type of work.
NEC 310.15 (C) Engineering Supervision, indicates that these calculations should be performed under engineering supervision.
.: Software:
There are several software packages available that will calculate the Neher-McGrath equations. Each of these packages has its pros and cons. Please feel free to email us with your particular project requirements and we can help you find the software package that best suits your needs. Email Us
.: Professional Articles :
Heating- Pure Power Spring 08
Duct Bank Heating Calculations are Essential for
Critical Environments (Data Centers)
.: DuctShow©:
By downloading you agree that DuctShow movies are Proprietary and for demonstration purpose only. The information shown in the DuctShow© movies below are NOT applicable to any and all real world installations.
.: Special LowRHO® concrete Mix:
High strength LowRHO® Mix Desig
Low strength LowRHO® Mix Desig
.: RHOMON® Conduit Thermal Couplings:
RHOMON® Conduit Thermal Couplings are specially engineered pieces of conduit that are placed in your duct bank during installation. These units monitor temperature and can be set up in a self contained system or tied into the building BMS system
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