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Substation Earthing

This intensive three-day course will give you an insight into all aspects of substation earthing for low, medium and high voltage systems (distribution and transmission), to ensure safety, protection and regulatory compliance.

The comprehensive programme includes technical sessions on earthing design and specifications, current standards and regulations, earth grids, resistivity, site areas, conductors, earth rods and GIS, and includes a practical earthing measurement exercise and subsequent data analysis. The speakers have been selected for their extensive industry experience and expertise and throughout the course you will have ample opportunity to discuss issues of interest with them.

Day one

Introduction and Principles of Earthing in LV, MV and HV Systems

  • Role, principles and importance of earthing
  • Preventing electric shock in LV systems
  • Earth faults, fault voltages, EPR and voltage gradient in MV and HV systems
  • Impedance in earthing and bonding conductors
  • Important criteria for earthing assessment

LV Earth Systems and Earth Terminals

  • Earthing requirements for public LV systems
  • Earth terminals for supply points in public and private LV cable systems
  • Abnormal voltages on LV earth terminals
  • Requirement to separate HV and LV earth systems
  • Special LV earthing situations

Earth Fault Current and EPR Analysis

  • System earthing
  • Redial and non-radial systems
  • Simplified and rigorous fault current analysis
  • Data and accuracy for project and EPR assessments

Introduction to Earth Standards and Company Earthing Policies

  • The need for standards and company procedures
  • The voltages and environmental impact that occur during an earth fault at a small substation
  • Description of safety voltages, limit values and ways they are constrained
  • Developments in ENA S34 and 14-24

Introduction to Earthing Design

  • Earthing standards; how this guides design practice
  • Main design criteria
  • Introduction to earth resistance formulae
  • Comparison of ways to reduce the earth resistance

Day two

Design of Substation Earthing

  • Stages in the design of a LV distribution substation
  • Use of standard formulae to investigate design options and check compliance with standards
  • Design of the local substation electrode system
  • Design of the earthing system for a HV substation
  • Exercise in developing the outline electrode design

Measurement Theory

  • Earth resistivity
  • Earth resistance

Practical Measurement Exercise

  • Group exercise undertaking soil resistivity and electrode resistance measurements

Analysis of Measurement Data

  • Delegates will use specialist software to gain a derived soil model for design purposes
  • Analysis of electrode resistance data to calculate the true resistance of the measured earthing system

Day three

Industrial Site Measurement Case Study

  • Undertaking measurements in difficult locations
  • Highlight the important issues
  • Explanation of procedures

Analysis of Earth Fault Current and EPR in more Complex Network Arrangements

  • Network calculation procedures
  • Mixed underground and overhead systems and isolated cable sections in overhead lines
  • Identifying points of worst case EPR

Example Case Studies and Calculations of EPR and risk effects in Industrial, generation and Public HV and MV Systems

  • Generation and industrial sites connected to cable and overhead line systems
  • Separation of HV/MV and LV earth systems in high resistivity areas
  • LV installations in vicinity of HV equipment with high EPR

Course review

Programme may be subject to amendment

  • Enhance your knowledge of earthing principles and systems
  • Understand the legal and environmental framework and standards that apply to earthing systems
  • Develop your ability to specify earthing system design to current standards
  • Reduce the risk of critical system failure through enhanced design
  • Enhance your understanding of the role of earthing systems in safe working practices
  • Enhance your understanding of earthing measurement processes and the anlaysis of measurement data
  • Develop knowledge of managing earthing system design and maintenance projects

This course is delivered by leading specialists in earthing assessment, design and audit and draws on their extensive expertise in the field.

View full course schedule


Course duration: 3 days


CPD Information


EA Technology are accredited members of the CPD certification service. This course counts towards your planned CPD requirements.

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