How Travelling Wave Technology Is Locating the Fault Site

Scottish and Southern Energy (SSE) is responsible for generation, transmission and distribution of electricity in the north of Scotland. The system in Scotland is predominantly rural with the bulk of the transmission on 132 kV double circuits. One of these circuits with a tee connection to a transformer station feeding local load, showed increased tripping activity from 2006. Thereafter an emerging pattern of increasing faults could not be fully explained by the foot patrols and helicopters sent to investigate. The distance to fault on the tee circuit could not be accurately identified for a number of reasons outlined in this paper.

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