Real-Time Thermal Rating
Real-Time Thermal Rating (RTTR) devices are being used to monitor the real-time capability of overhead lines, transformers and underground cables on the Northern Powergrid network.
Why are we doing this?
RTTR systems calculate the thermal ratings of power equipment based on both the actual weather conditions, and the electrical current and temperature of the equipment. This gives us an accurate picture of the capacity of the network in real time, supplying network planners with the information needed to relieve strain on the network and make better decisions on when and where investment in infrastructure is needed.
The link between RTTR and customer demand-side response/energy storage means that if an asset is in danger of overheating, an appropriate response can be activated to reduce the load on it.
What have we learned so far?
When RTTR information and our GUS active network management system are combined, responses such as driving storage batteries and evoking interventions are achievable.
Early analysis shows there may be grounds to challenge the official planning ratings we are using and that ratings can be used to plan the network. In addition, we have learnt that caution needs to be exercised in applying RTTR, as a back-up system is needed to avoid overloading the network
