Failure of transmission towers or their associated components can cause a cascading failure involving a number of adjacent towers along the line. Repair is very costly: it involves replacement of overhead lines and towers affected, and includes other costs associated with power disruption and litigation. Therefore utilities spend a significantly amount of money on inspection and maintenance programmes to prevent failures occurring. Over the RIIO-ED1 period it is anticipated nearly UK DNO’s will spend £1B on this activity alone.
To develop a model that considers how tower components are affected by corrosion and wear due to particular environmental conditions. This model assesses tower components’ condition estimates their lifetime expectancy at specific sites providing invaluable support to the decision making process
The development of the project at PNDC comprised the following steps:
- Identification of factors with highest impact on corrosion process through literature review
- Review of state art of the hazard models to predict corrosion
- Creation of database containing information on tower components condition and environmental factors on site, e.g. temperature, wind speed, pollution concentration, etc.
- Correlation study to identify factors that have the highest impact on the deterioration of towers components
- Develop model and implement model to determine remaining life of components
A hazard model was created and implemented for particular areas of the transmission network. The model helps identifying areas were corrosion process develops faster and estimate remaining life. The model is expected to be integrated in the CBRM tool and complement existent models.
- Estimation of remaining tower components life
- Visualisation of deterioration progress in particular areas – Survival curves
- Rating of components risk of failure
Estimated Inspection & Maintenance spend for UK DNOS over RIIO-ED1
towers data included in study
circuits assessed as part of study