Substation Earthing

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Course overview

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.

Cost: Three-day course: £1,160 + VAT

Location: EA Technology, Capenhurst, Chester, CH1 6ES

Who should attend?

This course includes essential learning for you if you

are an engineer or technician involved in earthing of

electrical equipment, especially within the substation

environment.

Those that have responsibilities to ensure the safe

operation of electrical systems in private industry,

distribution and transmission networks and generators.

Asset managers and substation designers and operators

will also benefit from this course, as will architects and

civil engineers involved in substation construction.

Benefits of attending this course

• Create safer working environments for you and

your colleagues

• Develop specialist substation earthing skills that are

in short supply

• Develop your ability to specify earthing system

design to current standards

• Reduce the risk of critical system failure through

enhanced design

• Gain expertise in managing earthing system design

and maintenance projects

Substations Courses Specialist CoursesCables CoursesPower Networks CoursesProtection CoursesTailored Programmes

Substation EarthingCourse programme

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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

Safer, Stronger,Smarter Networks

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