OHL Real Time Thermal Rating Installation Guide
Overview
Real Time Thermal Rating (RTTR) is one of the network technologies trialled under the Customer-Led Network Revolution. This document describes how RTTR devices were installed on overhead lines for the project.
Generally on overhead line installations, the device and thermal rating system consists of a group of monitoring devices measuring conductor loading and environmental conditions, that links to a model construction of the line that complies with existing design and construction standards, the benefits of localised environmental monitoring can infer a potential change to those existing static constraints. (ENA engineering recommendation P27 1986)
One of the RTTR solutions deployed in the Customer-Led Network Revolution was RTTR of bare-conductor overhead lines at HV (20kV) and EHV (66kV). This document captures the detailed learning about the installation process for the On-Line Sensors, Weather Stations and Local Controllers employed in this RTTR system. Guidance is provided on both dead installation (with a circuit outage) and Live Working installation, depending on the voltage at which the equipment is to be installed and the location.
Examples of the specific processes and procedures created for Live Work installation are given in the appendices, to guide the production of specific policies, procedures and training for Network Operators wishing to implement RTTR on overhead lines.
