Protective Earthing

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  • Fees : 2900 $
  • Date 28 Apr 2019
  • Location Abu Dhabi, English
PROTECTIVE EARTHING
Course Description

 
Few topics generate as much controversy and argument as that of grounding (or earthing as it is called in some countries) and the associated topics of lightning and surge protection of electrical and electronic systems. Any engineer dealing with power supply networks needs to understand the basic principles of grounding system design and its role in ensuring safety of equipment and personnel. A correct understanding of the basic principles involved will help him/her to avoid mistakes in grounding system design, mistakes that could lead to expensive failures and long downtime. In this workshop, we will demystify the concepts of grounding as applicable to utility networks and industrial plant distribution systems as well as their associated control equipment. In fact, a lot of myths have been built around this subject ,although it is quite a simple one when approached from basic principles. Our endeavour will therefore be to explain the fundamentals of grounding, which we hope will enable you to gain a correct perspective of the subject and give them the knowledge needed to solve real life grounding problems. Essentially this workshop is broken down into System Grounding, Protective grounding and Surge/noise protection of power and electronics systems normally found in distribution networks. A brief introduction to the design of substation grounding has been included. Detailed information on ground electrodes and measurement of ground resistance is also available
Course Objective

 

 

The basic principles of grounding of electrical systems

 

 

 

 

 

 The function of power system grounding and the various options available

 Role of protective grounding in ensuring safety; sizing of grounding conductors

 Importance of equipotential bonding in ensuring safety

 Design of ground electrodes, measurement of soil resistivity and ground electrode resistance

 Fundamental principles in the design of grounding systems in substations

 Solving static electricity-related hazards by grounding and bonding

 Role of grounding in protecting substation structures from lightning hazard

 Role of grounding in surge protection of power distribution equipment and sensitive systems

 Noise in electrical systems and the role of grounding in noise mitigation 

Course Certificate

 
Certificate will be issued to all attendees completing minimum of  75% of the total tuition hours of the course.
Who Should attend?

 
Instrumentation and Control Engineers

 

 

 

 

 

Consulting Engineers

Electrical Engineers

Project Engineers

Maintenance Engineers

Power System Protection and Control Engineers

Building Service Designers

Data Systems Planners and Managers

Electrical and Instrumentation Technicians

Course Outline

 
OVERVIEW

 

 

 

 

 

 Basics of grounding

 Bonding

 Role of grounding in lightning protection

 Ground electrodes and factors affecting their efficiency

 Grounding issues in outdoor substations

 Grounding for static charges

 Surge Protection

 Importance of grounding in mitigation of noise in sensitive circuits

 Importance of Local Codes

 

POWER SUPPLY SYSTEM GROUNDING

 Types of system grounding

 Ungrounded systems

 Solidly grounded systems

 Impedance grounding using neutral reactor

 Resonant grounding using neutral reactor

 Impedance grounding through neutral resistance

 Classification of supply systems based on grounding

 Point of grounding

 Other challenges

PROTECTIVE GROUNDING

 Electric shock, its cause and effects

 Direct and indirect contact

 Touch and step potential

 Role of protective grounding in minimizing the shock hazards

 Equipotential bonding

 Protective grounding conductors and installation

 Ground fault protection

 System classification based on system/protective grounding

GROUND ELECTRODE SYSTEMS

 Soil resistance and factors affecting soil resistivity

 Measurement of soil resistivity

 Resistance of ground electrode and distribution of resistance in surrounding soil layers

 Electrode current capacity

 Ground electrode configurations

 Parallel electrodes

 Ground electrode resistance measurement

 Chemical electrodes

 Concrete encased electrodes and splicing methods

 Corrosion of buried electrodes

 Grounding system maintenance

SUBSTATION GROUNDING DESIGN

 Grounding practices

 Basic design approach

 Calculating the ground fault current

 Ground potential rise in HV systems

 Grounding design in LV and MV substations/installations

 Grounding grid design for HV/EHV substations – A step-by-step approach

 Introduction to 2-layer soil model

 Transferred potential and ways of avoiding

 Points needing special attention in substation grounding design and for GIS

equipment

 Design of substations containing converter equipment feeding to HVDC transmission systems

 Ensuring effective substation grounding – Important aspects

 STATIC ELECTRICITY AND PROTECTION

 What is static electricity and how is it generated?

 Examples of static charge build up and its dangers

 Energy of spark due to static electricity

 Ways of controlling static build up

 Risk assessment and preventive measures

GROUNDING FOR LIGHTNING PROTECTION OF BUILDINGS AND STRUCTURES

 The physics of lightning

 Lightning incidence in different land masses

 Lightning strike probability

 Lightning protection

 Planning for protection and decision factors

 Improved approach to lightning protection and non-conventional systems

 Effect of lightning strikes on electrical installations

SURGES AND SURGE PROTECTION

 Surges, their causes and mitigation

 The ways by which surges couple into electrical circuits

 Bonding of grounding systems

 Basic principle of surge protection and commonly used surge protection devices

 Graded surge protection

 Selecting appropriate surge protective devices and their positioning in a system

 Importance of correct grounding practices for sensitive equipment

 Other ways and devices for mitigating surge problems

 Comparative merits of different types of SPDs for sensitive equipment

 Hybrid surge protective devices

 Surge protection of telemetry and data communication systems

ELECTRICAL NOISE AND MITIGATION

 Definition of electrical noise

 How are sensitive circuits affected?

 Noise categories

 Noise from power electrical equipment

 Noise coupling into signal circuits

 Noise mitigation measures

 Role of proper grounding in reducing noise

 Noise control by proper grounding of UPS derived supplies

SUMMARY, OPEN FORUM AND CLOSING

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