Transcript WG B1-41 1st meeting Milan 030813 ( ppt , 813 kB )

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
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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
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Members
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Last name
First name
Country
Function
Zenger
Walter
USA
Convener
Brakelmann
Heiner
Germany
Member
Burceanu
Monica
Belgium
Member
Chatzipanos
Michail
Greece
Member
De Wild
Frank
Netherlands Member
Frost
David
Australia
Genovesi
Mario
Italy
Head
Julian
UK
MemberCorrespond.
MemberCorrespond.
Member
Millar
John
Finland
Member
Moreau
Christophe
France
Member
Douima
Youssef
France
Young Engineer
Oliveira
Fabio
Brazil
Orella
Josu
Spain
MemberCorrespond.
Member
Arguelles
Jose Manuel
Spain
Young Engineer
Parmar
Deepak
Canada
Member
Zhang
Qunfeng
China
Member
Thunberg
Erik
Sweden
Bacchini
Marco
Italy
MemberCorrespond.
Local Expert &
Host of meeting in
Milan
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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
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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
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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
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Scope of WG B1.41
1. To review the literature (experience, history) on the subject
Cigre 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
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other
utilities
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
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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
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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
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Physical changes – Geometry, moisture content, compaction, porosity,
density
Chemical changes
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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
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