Introduction: The project scope is to provide optimised condition assessment sampling for OHL conductors and improve the way National Grid makes use of existing data by applying it across the England and Wales Transmission network. This methodology allows other measures of asset condition to be incorporated into the model, and also has the potential to be applied to the condition assessment of other transmission assets.

Objectives:

• Refined understanding of the condition of National Grid's OHL system by extracting maximum value from existing data
• Optimisation of National Grid's future OHL conductor sampling programme
• Refined deteriation models that can be used to better forecast network risk

Expected Benefits: This project is successful if it delivers:

• Report detailing the application of proposed methodology within the National Grid Electricity Transmission business.

• England & Wales OHL Conductor Condition Assessment Model identifying varying degrees of uncertainty, focussed on ACSR circuits, 30-50 years old.

• The tools and techniques to inform a National Grid policy change with regards to the OHL conductor condition assessment based on the outcome of the above two deliverables.