IEEE 442-2017 en Guide for Thermal Resistivity Measurements of Soils and Backfill Materials.pdf

1、IEEE Guide for Thermal Resistivity Measurements of Soils and Backfill Materials IEEE Std 442-2017 (Revision of IEEE Std 442-1981) IEEE Power and Energy Society Sponsored by the Insulated Conductors Committee IEEE 3 Park Avenue New York, NY 10016-5997 USAIEEE Std 442-2017 (Revision of IEEE Std 442-19

2、81) IEEE Guide for Thermal Resistivity Measurements of Soils and Backfill Materials Sponsor Insulated Conductors Committee of the IEEE Power and Energy Society Approved 28 September 2017 IEEE-SA Standards BoardAbstract: The measurement of thermal resistivity of soil and backfill materials to include

3、 concrete, engineered backfills, grout, rock, sand, and any other material used to encase the cable system installed in the ground is covered in this guide. A thorough knowledge of the thermal properties of a soil or backfill material enables the user to properly design, rate, and load underground c

4、ables. The method used is based on the theory that the rate of temperature rise of a line heat source is dependent upon the thermal constants of the medium in which it is placed. The designs for both laboratory and field thermal probes are also described in this guide. Keywords: backfill, IEEE 442,

5、soil, soil thermal properties, thermal needle, thermal probe, thermal property analyzer, thermal resistivity The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright 2018 by The Institute of Electrical and Electronics Engineers, Inc. All right

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35、8 IEEE. All rights reserved. Participants At the time this guide was submitted to the IEEE-SASB for approval, the IEEE P442 Working Group had the following membership: Nimesh Patel, Chair Sudhakar Cherukupalli, Vice Chair Earle C. (Rusty) Bascom III William Black Chris Grodzinski Dennis E. Johnson R

36、achel Mosier Lucian Munteanu Deepak Parmar David Purnhagen Walter Zenger The following members of the individual balloting committee voted on this guide. Balloters may have voted for approval, disapproval, or abstention. Saleman Alibhay Thomas Barnes Earle C. (Rusty) Bascom III William Black William

37、 Bloethe Kenneth Bow Kent Brown William Byrd Sudhakar Cherukupalli Michael Chirico Robert Christman Gary Donner Donald Dunn Todd Goyette Randall Groves Ajit Gwal Jeffrey Helzer Lee Herron Lauri Hiivala Werner Hoelzl Magdi Ishac Dennis E. Johnson Jim Kulchisky Chung-Yiu Lam Michael Lauxman John Meran

38、do Daleep Mohla Rachel Mosier Jerry Murphy Arthur Neubauer Michael Newman Charles Ngethe Lorraine Padden Deepak Parmar Nimesh Patel Shashikant Patel Branimir Petosic Christopher Petrola Thomas Proios Charles Rogers Ryandi Ryandi Daniel Sabin Bartien Sayogo Michael Smalley Jeremy Smith Jerry Smith Da

39、vid Tepen Peter Tirinzoni Nijam Uddin John V ergis Kenneth White Jian Y u Walter Zenger Tiebin Zhao When the IEEE-SA Standards Board approved this guide on 28 September 2017, it had the following membership: Jean-Phillipe Faure, Chair Gary Hoffman, Vice Chair John D. Kulick, Past Chair Konstantinos

40、Karachalios, Secretary Chuck Adams Masayuki Ariyoshi Ted Burse Stephen Dukes Doug Edwards J. Travis Griffith Michael Janezic Thomas Koshy Joseph L. Koepfinger* Kevin Lu Daleep Mohla Damir Novosel Ronald C. Petersen Annette D. Reilly Robby Robson Dorothy Stanley Adrian Stephens Mehmet Ulema Phil Wenn

41、blom Howard Wolfman Y u Y uan *Member Emeritus7 Copyright 2018 IEEE. All rights reserved. Introduction This introduction is not part of IEEE Std 442-2017, IEEE Guide for Thermal Resistivity Measurements of Soils and Backfill Materials. An important design consideration in the design of underground c

42、able systems is to understand the thermal resistivity characteristics of the materials that surround the cable. Over the years, many utilities, consultants, and testing firms have measured soil thermal resistivity both in situ and in the laboratory on selected soil samples. Such measurements have ut

43、ilized various types of equipment and measurement techniques. In many cases, these testing methods have yielded inaccurate or inconsistent measurements of soil thermal resistivity. The Insulated Conductors Committee, recognizing the need for industry guidelines for the measurement of soil thermal re

44、sistivity, has prepared this guide to provide the user information on the test equipment that should be used to perform these material resistivity measurements. In addition, the guide provides information on how to make the in-situ or laboratory resistivity measurements and interpret the data in ord

45、er to provide meaningful results using this equipment. The in-situ resistivity of a soil changes from season to season, due to changes in the moisture content of the soil or due to the relocation of the water table. It is important to consider these factors when determining a soil thermal resistivity value for ampacity calculations and rating underground cables.