Ferguson Johnson

400kV EPR Assessment

Allens West Residential Development

SPE was contracted by Ferguson Johnson to asses the Earth Potential Rise (EPR) associated with a 400kV National Grid transmission line through a planned residential estate.

SPE’s scope of work was to assess each of the tower bases, for a phase-earth fault and calculate the associated touch potential, EPR and transferred potential risk of the Hot Zone onto the adjacent LV and 11kV earthing system. SPE developed a detailed model of the tower base in SESCAD, and then carried out a detailed analysis of the fault current distribution in the transmission line using the CDEGS TRALIN and SPLITS modules.

In addition, SPE also carried out an assessment of touch voltage risks for incoming lightning strikes and the risk of induced voltages on nearby metallic structures using the EMTP-ATP software package.

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Key Features

Client: Ferguson Johnson
Industry: Building Services / Transmission & Distribution
Plant Type: Residential Development
Project:  Earthing Study
Contract: Lump Sum
Date: 2020

“SPE undertook an Earthing study to assess the Earth Potential Rise of a 400kV Transmission line on a nearby residential estate.”