Development of an Interlock System for Portable Primary Earths on the National Grid System
National Grid Electricity System Operator
National Grid TO Innovation Team
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Innovation Funding Incentive
Health and Safety
It is intended to use this device for all substations down lead and down dropper portable earthing work completed by the Overhead Line (OHL) teams. The current prototype has twenty keyway variations of the interlock system, it is intended to increase this to thirty to reduce the possibility of replication.
This programme addresses issues relating to earthing a subject that has a major importance in ensuring safety of people (National Grid staff and the general public) who are in proximity to high voltage assets. The issues addressed within the programme are the improvement of safety systems to OHL work involving application and removal of portable primary earthing devices the lack of transient high frequency measurements on substation earthing systems during switching operations, surge arrester operation or during the flow of fault current in practice. In addition, no data on the effect of lightning impulse or tests data within substations exist. In order to verify the simulation models, it is crucial that measurements are undertaken.