May 2017
Electricity Transmission
Novel methodology for assessing environmental exposure of OHL routes
May 2017
Nov 2018
National Grid Electricity Transmission
Jonathan Hennah
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Network Innovation Allowance
Electricity Transmission Networks
The scope of this project is to further develop the techniques identified for classifying wind exposure of OHL line routes and incorporate corrosion risk in order to better understand the effect of environmental inputs on conductor deterioration. The project will combine novel corrosion and mechanical wear models developed using advanced weather data and conductor response models.

The project can be split into the following work packages.• Corrosion classification based on weather and pollution modelling • Mechanical wear classification based on weather and mechanical response model• Verification of model and environmental risk classification against condition information

The inputs to the project will be learning from the previous NIA project, advanced weather data, pollution data, mechanical response model, corrosion standards, and asset condition data. The output of the project is a risk classification and probability of condition state for each span section of OHL route based on the mechanical frequency response in terms of cycles per year and a corrosion risk based on ISO corrosion standards which can be equated to material loss per year.

This project will be limited to ASCR circuits.

To produce a novel methodology for the classification of total environmental input to OHL Systems in order to better understand the environment as a modifier to OHL conductor and fittings degradation.

This project will provide a new methodology for classifying environmental risk for OHL conductors and fittings base on environmental exposure. The project will be successful if the classification system developed proves to be accurate when verified against asset condition data.