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Cigre WG B1.41 Meeting Long term performance of soil and backfill of cable systems

Cigre WG B1.41 Meeting Long term performance of soil and backfill of cable systems. Milan, Italy Mar 07 - 08, 2013 Walter Zenger, USA Convener of WG B1.41. Agenda. Introduction Each member to present their past experience on this subject.

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Cigre WG B1.41 Meeting Long term performance of soil and backfill of cable systems

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  1. Cigre WG B1.41 MeetingLong term performance of soil and backfill of cable systems Milan, Italy Mar 07 - 08, 2013 Walter Zenger, USA Convener of WG B1.41

  2. Agenda • Introduction • Each member to present their past experience on this subject. • The corresponding members are asked to provide me prior to the meeting with a short write-up of their experience. • Membership including Corresponding members and Young Engineers • Selection of Secretary of WG B1.41 • Review of Terms of Reference (ToR) and results of TF B1.41 • Approval process of ToR and input by TF members as well as Technical Committee approval Walter Zenger - United States

  3. Members Walter Zenger - United States

  4. Agenda (cont.) • Discussion of WG procedures • WG B1.41 website and documents • Sign-up as WG expert if not individual Cigre member • Web-based meetings or conference call in between meetings • How to manage the two areas of land and submarine cables • How can corresponding members contribute? • Discuss ToR Scope items 1 to 4 and assign collection of data to WG members including scope of each item and schedule Walter Zenger - United States

  5. Agenda (cont.) • Need to engage SC D1 ? • Annual Report to be presented to SC B1 • Determine if WG has to issue a questionnaire or whether we can use questionnaire of WG B1.35. • Next meeting – Date & Host Walter Zenger - United States

  6. Main Goals of WG B1.41 • Determine the long term performance of soil and backfill • Understand the parameters that can impact the change in properties over time • Draw on existing knowledge of heat flow, soil and backfill properties and short term soil and backfill stability • For existing systems – primary focus • New installed systems • Impact of increased loading • Long-term changes in environmental conditions • Evaluate historic development of backfill engineering Walter Zenger - United States

  7. Scope of WG B1.41 1. To review the literature (experience, history) on the subjectCigre and IEC Jicable, IEEE, EPRI, Kema, Ontario Hydro & HQ, CEGB, ERA, IET, Heiner B, EDF, Canadian Soils database, NZ Gov report, Other 2. To establish the appropriate terminology and characterization parameters. 3. To review methods to measure the thermal, mechanical and chemical soil / backfill properties and stability. IEEE, ASTM, DIN EN 12390-2, BS EN 12390-2, nuclear density gauge (ASTM) Troxler, BS/IEC 60692, TPA and related methods, Soil stability measurements. 4. To review methods to measure the aging and long-term stability of soil and backfill properties over system life 5. To review technical methods how to mitigate deterioration of soil and backfill conditions including moisture depletion by vegetation or other utilities Walter Zenger - United States

  8. Scope of WG B1.41 ( cont. ) 6. To evaluate the consequences, if no action is taken, such as loss of ampacity, including cost and overheating of the cable system. 7. To integrate the information in a practical users guide. 8. To apply to extruded, paper, and paper-laminate cable systems 9. To apply to HV AC and DC land cable systems including direct buried, direct buried ducts or pipe, duct bank / manhole systems, and Horizontal Directional Drill (HDD) installations 10. To apply to HV AC and DC submarine cable systems including ploughing, jetting, trenching and HDD installations 11. To apply to MV AC cable systems of high importance Walter Zenger - United States

  9. Terms • Thermal resistivity • Thermal diffusivity • Thermal stability / thermal runaway • TPA - Thermal Property Analyzer • Earth Interface Temperature • Controlled dry-out / critical temperature / critical radius • Heat flux • Time to dry-out • Ambient Earth Temperature and it’s change over time • Physical Parameters • Geometry • Soil type / Composition / Texture • Moisture content / Critical moisture content / Saturation Index / Moisture capacitance • Degree of compaction • Soil density • Porosity Walter Zenger - United States

  10. Terms • Installation Parameters • Depth of burial – change over time • Type of cover – vegetation, streets, structures • Installation Methods • Type of installation – trenching, plowing – cable or duct, HDD • Cable configuration – direct buried, duct, duct bank, HDD • Backfill – Native / thermal sands / FTB / grouting • Casings and HDD, ducts grouted or water filled • Forced cooling systems • Submarine environment • Test methods • Applicable standards and publications • Test setups • Sampling • Field thermal survey – in-situ testing • Aging or change over time • Physical changes – Geometry, moisture content, compaction, porosity, density • Chemical changes Walter Zenger - United States

  11. Other Issues • Questionnaire • Use results of WG B1.35 questionnaire? • Issue WG B1.41 questionnaire? • Annual Report to SC B1 • Next meeting • Date July 9 / 10 • Host Prysmian UK, Eastleigh • Webcast necessary ? Date Walter Zenger - United States

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