Development of OHL Hot Joint Monitoring Tool
National Grid Electricity System Operator
National Grid TO Innovation Team
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Innovation Funding Incentive
Gas Distribution Networks
National Grid currently complete helicopter borne infra red patrols on an annual
basis for 70% of the circuits and every two years for the remaining 30%. Part of
this inspection is the search for so called “hot joints”.
The current tool for sharing and recording hot joint data has become inadequate
and presently results in long delays in rectifying hot joint problems.
Hot joints can potentially cost the system operator (and thus the consumer if
passed through) thousands of pounds as well as possibly reducing system
security. This is due to the fact that circuits must be downrated if a hot joint is
discovered. Downrating of circuits can then result in constraint costs which can
Development of an innovative modelling and monitoring tool for overhead line hot joints that are discovered and reported by the helicopter unit as part of their annual infrared patrols. The model will act as the central repository for all
information relating to hot joints on the network (from identification to rectification) and include the deterioration prediction tool currently issued in TGN 200. Implementation via the National Grid SAM platform will allow access to multiple users at the same time and dramatically ease data sharing.