Feb 2013
Electricity Distribution
Feb 2013
Electricity North West Limited
Electricity North West Innovation Team
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Innovation Funding Incentive
High Voltage Technology
All designs for earthing systems consider the effects of touch and step potentials under fault conditions. However the quantity of concern is actually the current flowing through a human body, when in contact with metalwork subject to this potential and the time the current flows for. An electrode simply sited in soil which has a surface potential cannot be regarded as presenting the same hazard as metalwork with a direct metallic connection to the earth fault current return path. However there exists at this time no methodology for assessing either the hazard posed by such an earth electrode or the possible effects of the earth when connected to a distributed system on the Rise Of Earth Potential (ROEP) contours.

This project will if successful determine these effects and provide a means to provide cost effective safe earthing systems without the need for extensive separations between High Voltage (HV) and Low Voltage (LV) electrodes which in a Protective Multiple Earthing (PME) system may be impractical to achieve and maintain.

The project aims to develop new techniques to assess the impact of lower voltage earth electrodes on higher voltage ‘hot zones’, and to measure the resistance of distribution substation earth systems .