Apr 2013
Electricity Transmission
Portable Primary Earthing (PPE)
Apr 2013
National Grid Electricity System Operator
National Grid TO Innovation Team
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Innovation Funding Incentive
Health and Safety
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 use of portable primary earths, 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 and finally an assessment of the risk of rise of earth potential to inform the risk assessment process for mitigation of ROEP near high voltage assets.
To gain an understanding of how substation PPEs perform over extended application periods and declare a maximum continuous current rating of substation PPEs under induced current conditions.