HV Earthing System Studies

Ensuring safety and compliance of your electrical asset

Relying on over 15 years of experience in the field, PSC offers high voltage earthing system design studies that ensures the safety of persons within electrical installations and protection of client infrastructure and assets.

Our extensive experience in the assessment, design, modeling and analysis of HV earthing systems ensures that our team of specialists demonstrates compliance with the UK, National Grid, DNO, or international standards for a range of installations such as generation, transmission, distribution or industrial, operating at voltages between 11kV and 400kV.

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Soil resistivity measurements and analysis

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Preparation of HV earthing system design drawings

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HV earthing system modeling and analysis utilizing SES CDEGS software

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Earth Potential Rise (EPR) assessment

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Calculation of touch, step and transfer voltages

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Post-construction Fall of Potential (FOP) resistance measurement and analysis

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Third-party design audits

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HV earthing system feasibility studies

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Impressed voltage studies

Why Us for HV Earthing System Studies?

Vendor-neutral and independent technical consultancy
Expert knowledge of earthing system policies and specifications for transmission and distribution network assets
Over a decade of successful earthing system project delivery experience
Highly experienced team of innovative and creative thinkers focussed on developing solutions to complex problems

Our experience

Enoch Hill 33kV Onshore Wind Farm

  • PSC were requested to undertake an HV earthing design study for the Enoch Hill 33kV onshore wind farm, in accordance with UK standards. As part of the study, soil resistivity measurements were analyzed to develop soil model for each turbine, the substation and overall wind farm. An earthing system design was produced for each turbine to achieve a resistance of less than 10Ω (where practicable) in accordance with BS EN61400-24. An overall earthing system design was produced for the wind farm and CDEGS earth fault simulation studies were carried out to determine the resistance of the proposed earthing system, the resultant EPR and, touch and step voltages at the site and to confirm the ITU (Hot / Cold) site classification. Read more>

Nairn Road Substation

  • PSC were requested to undertake an HV earthing design study for the Nairn Road Substation, in accordance with UK standards. As part of the study, soil resistivity measurements were analyzed prior to designing the buried earth electrode system for the substation. CDEGS earth fault simulation studies were carried out to determine the resistance of the proposed earthing system and the resultant EPR and, touch and step voltages at the site.

South Redhouse BESS

  • PSC were requested to update the existing South Redhouse BESS earthing system to accommodate the inclusion of new HV plant, in accordance with ENA TS 41-24, BS EN 50522 and ENA ER S34. As part of the study, an earthing system design for the new HV plant area was incorporated into the existing CDEGS model for the substation and was simulated under single phase-to-earth fault conditions. The resultant EPR and touch and step voltages were determined to confirm site classification in accordance with ITU  specifications and the safety of personnel within the site.

Killala (Lisglannon) 38kV Substation

  • PSC were appointed to undertake an HV earthing design study for the 38kV AIS substation and associated wind turbines, in accordance with IEEE80, IEEE81 and ESBN specifications 18134 and 18133. As part of the study, soil resistivity measurements were analyzed prior to designing the buried earth electrode system for the substation and each wind turbine. CDEGS earth fault simulation studies were carried out to determine the resistance of the proposed earthing system and the resultant EPR, hot zone contours, and touch and step voltages at the substation and connected wind farm.

Millvale Solar PV Site

  • PSC were commissioned to design the Medium Voltage (MV) earthing system for the proposed Millvale Solar PV plant. The purpose of the study was to demonstrate that the earthing system will provide safe step and touch potentials throughout the site in accordance EN 50522. As part of the study, soil resistivity measurements were conducted and analyzed prior to designing the buried earth electrode system for the substation. CDEGS earth fault simulation studies were carried out to determine the resistance of the proposed earthing system and the resultant EPR and, touch and step voltages at the site.

Latest News

The importance of impressed voltages

The importance of impressed voltages

PSC UK’s Rob Knott and Stephen Lilley explain impressed voltages and how they can be a significant safety hazard to be managed and controlled on any electrical construction site. read more

HV earthing design and analysis in the UK

HV earthing design and analysis in the UK

PSC UK’s Rob Knott and Stephen Lilley explain High Voltage (HV) earthing system analysis & design and why such systems are important to creating safe work areas. read more

Contact us

Robert Knott – Principal Engineer

Robert Knott is an IET Chartered Engineer with over 15 years of international experience in the risk assessment, design and analysis of lightning protection systems across a diverse range of sectors including power generation, transmission, distribution, renewables (battery storage/solar/wind), oil and gas and industrial,  As a result, Rob offers his time and support as a Regular member of the CIGRE Working Group C..4.43 “Lightning problems and lightning risk management for nuclear power plants.” Working alongside other international experts in the field of lightning, we are working towards publishing a guideline for the development of lightning protection designs for nuclear power stations, based on the concept of lightning risk management.

Stephen Lilley – Senior Engineer

Stephen Lilley is a senior engineer with over 6 years of experience of lightning protection system assessment and design across the Power (generation, transmission, distribution), renewables, nuclear and industrial sectors.  Stephen has a comprehensive knowledge of the application of UK and international standards such as BS EN62305, IEEE998 and NFPA780.

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