Rating Impact of Non-isothermal Ground Surface (RINGS)
- Status:
- Complete
- Project Reference Number:
- NIA_NGET0082
- START DATE:
- END DATE:
Project summary
- Funding mechanism:
-
- Network Innovation Allowance
- Research area:
-
- ET - Network improvements and system operability
- Technology:
-
- Conductors
- Expenditure:
- £148,000
Summary
Documents
The IEC 60287 standard describes algorithms 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 Southampton University confirmed that the use of isothermal surface temperatures was valid for cables buried at more than 1 metre depth but for shallow buried cables, including those in surface troughs; this assumption was shown to be optimistic, leading to possible overrating of such cables. Conversely cables may be underrated to mitigate for the unknown affect of non-isothermal temperatures.
Benefits
This project will be successful if we understand in greater detail the issues around Cable ratings in non-isothermal ground surfaces.
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