Evolution of MV Cable Designs in the US from 1993 to 2014

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Brittany Short
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1 Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to 2014 Evolution of MV Cable Designs in the US from 1993 to 2014 Essay Wen Shu & Nigel Hampton

Several surveys were performed by Joe Dudas, supported by AEIC and

Materials Conductor System sizes Installation practices Results were

2 Several surveys were performed by Joe Dudas, supported by AEIC and NRECA ( ), to establish industry trends in MV cable use. Materials Conductor System sizes Installation practices Results were very useful to utilities and manufacturers in understanding current trends new install, replacement, etc. Last survey was conducted in Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to

3 Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to Installed Cable Base Interested in what went on here 21% Underground

4 Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to Evolving Cable Design Solutions Semicons (cond & ins shields) Jacket Barrier 0 Paper Tape Carbon Tape Jacket Extruded Lead 1 Thermoplastic Graphite / Carbon Tape 2 HMPWE Extruded Thermoplastic 3 Graphite / Carbon Tape None XLPE 4 Extruded Thermoplastic None or 5 EPR Generation Insulation 6 7 WTR Extruded Thermoset XLPE (crosslinked) Jacket 8 Conductor Blocking or 9 EPR Blocking / Metal Barrier 10????

Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to 2014 5 Survey Approach Data extracted from utility

5 Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to Survey Approach Data extracted from utility purchase specifications and procurement records 69 Fields 6,024 Entries... Total Reported Length = 94 million ft. (18 thousand miles)

6 Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to Selection of Collated Information Conductor Conductor Shield by Cable Miles Purchased per Year Conductor Material Conductor Type Conductor Size Conductor Fill Conductor Shield Compound by # of Utilities Specifying Conductor Shield Compound Insulation Insulation Material Insulation Material Metallic Shield Jacket Other Insulation Thickness Metallic Shield Type Jacket (Y/N) Cable Selection

7 Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to Voltages Supplied weighted by length 15kV 25kV 35kV 12% 39% 49%

8 Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to WTRXLPE Only EPR Only EPR or WTRXLPE Materials Specified Supersmooth 34% Not Specified 30% 66% 51% 19%

Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to 2014 9 Evolution of Materials Specified WTRXLPE EPR EITHER Studies

9 Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to Evolution of Materials Specified WTRXLPE EPR EITHER Studies are based on sampling of all the utilities 30% Thus Point Estimates have a Margin of Error based on participants & utility pool 51% 19%

10 Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to Sampling & Margin of Error Represents US Utility Space WTRXLPE EPR

11 Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to Evolution of Materials Specified Margin of Error included

12 Evolution of Materials Used Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to

13 Evolution of Materials Used Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to

14 Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to Flexibility, Expected life, Ease of terminating, Cost, Temperature rating. Factors for Cable Choice Expected Life Cost Flexibility Composite Score for IOU and Coop (2004) Ease of Termination Temperature Rating Score 15 20

15 Factors for Cable Choice Utilities were asked to rate the importance of the factors listed below based on their relative impact on the decision-making process for purchasing. Cable cost Qualification results (AWTT, ACLT, IEC, etc.) Factory audit results Warranty Past experience at a neighboring utility Industry presentation by manufacturers Industry presentations by utilities and other organizations Cable manufacturer reputation Insulation compound manufacturer reputation Management at your utility Expected life Temperature rating Ease of terminating/ jointing Size (reduced wall, flat strap neutral, cross-linked jacket, etc.) Compatibility with accessories used by your utility. Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to

16 Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to Factors for Cable Choice st of 5 in nd of 5 in th of 5 in th of 5 in 2004

17 Oct 2018 Sub A Evolution of MV Cable Designs in the US from 1993 to Conclusions This work should be used rather than the 2003 Dudas surveys 9 in every 10 miles has an aluminium conductor. At least 3 in every 10 miles will use Superclean / Supersmooth conductor screen. 7 in every 10 miles will use WTRXLPE. 5 in every 10 miles will be at 15 kv level. 7 in every 10 miles will be at the 100% insulation level. 8 in every 10 miles will have a concentric neutral wire screen. Top three reasons for making cable choice 1. Expected life 2. Experience within the utility 3. Accessory compatibility Least important reasons for making cable choice Manufacturer presentations Experience at neighboring utilities

SPECIFICATION FOR EXTRUDED DIELECTRIC, SHIELDED POWER CABLES RATED 5 THROUGH 46 kv

AEIC CS8-13 SPECIFICATION FOR EXTRUDED DIELECTRIC, SHIELDED POWER CABLES RATED 5 THROUGH 46 kv (4 th Edition) Association of Edison Illuminating Companies AEIC CS8-13 SPECIFICATION FOR EXTRUDED DIELECTRIC,