Projects
Projects: Projects for Investigator |
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| Reference Number | NIA_NGET0082 | |
| Title | Rating Impact of Non-isothermal Ground Surface (RINGS) | |
| Status | Completed | |
| Energy Categories | Other Power and Storage Technologies(Electricity transmission and distribution) 100%; | |
| Research Types | Applied Research and Development 100% | |
| Science and Technology Fields | ENGINEERING AND TECHNOLOGY (Electrical and Electronic Engineering) 50%; ENVIRONMENTAL SCIENCES (Earth Systems and Environmental Sciences) 50%; |
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| UKERC Cross Cutting Characterisation | Not Cross-cutting 100% | |
| Principal Investigator |
Project Contact No email address given National Grid Electricity Transmission |
|
| Award Type | Network Innovation Allowance | |
| Funding Source | Ofgem | |
| Start Date | 01 April 2012 | |
| End Date | 01 April 2014 | |
| Duration | 24 months | |
| Total Grant Value | £110,000 | |
| Industrial Sectors | Power | |
| Region | London | |
| Programme | Network Innovation Allowance | |
| Investigators | Principal Investigator | Project Contact , National Grid Electricity Transmission (100.000%) |
| Web Site | http://www.smarternetworks.org/project/NIA_NGET0082 |
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| Objectives | The objectives for this project are to; Understand how the ratings of shallow buried cables and cables in surface troughs are affected by non-isothermal boundary temperatures; and Recommendations for temperature conditions to be used in modelling of shallow buried cables and cables in surface troughs. This project will be successful if we understand in greater detail the issues around Cable ratings in non-isothermal ground surfaces. | |
| Abstract | Recent cable installations have also employed low Thermal Resistivity backfills enabling a higher heat transfer rate from the cable to ground surface, potentially increasing the ground surface temperature. This leads to uncertainty in the actual cable rating available in such situations. It is proposed that monitoring equipment is installed at a site where this situation occurs with the aim of collecting temperature and air flow data over a one year period to cover all seasons and a wide range of loading. The site most suitable for this would be at the Woodhead tunnel where new trough systems have been installed between the sealing ends and the tunnel. This data would then be used by Southampton University to assess how surface temperature is affected leading to a recommendation of temperature range to be used in cable modelling. The IEC 60287 standard describes alogorithms for use with various cable laying conditions including shallow buried cables. The standard assumes ground surface temperatures to be isothermal. The FEAR R&D project undertaken by the University of Southampton confirmed that the use of isothermal surface temperatures was valid for cables, including those in surface troughs, this assumption was shown to be optimistic, leading go possible overrating of such cables. Conversely cables may be underrated to mitigate for the unknown effect of non-isothermal temperatures. Recent cable installations have also employed low Thermal Resistivity backfills enabling a higher heat transfer rate from the cable to ground surface, potentially increasing the ground surface temperature. This leads to uncertainty in the actual cable rating available in such situations. It is proposed that monitoring equipment is installed at a site where this situation occurs with the aim of collecting temperature and air flow data over a one year period to cover all seasons and a wide range of loading. The site most suitable for this would be at the Woodhead tunnel where new trough systems have been installed between the sealing ends and the tunnel. This data would then be used by the university of Southampton, to assess how surface temperature is affected leading to a recommendation of temperature range to be used in cable modelling. he method that has been proposed for this project is: Install temperature and air velocity monitoring equipment Set up remote visualisation of data Analyse data Report on data analysisNote : Project Documents may be available via the ENA Smarter Networks Portal using the Website link above | |
| Publications | (none) |
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| Final Report | (none) |
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| Added to Database | 05/12/18 | |
