Course details

Overview ?

Why Choose this Course?

This course teaches practical electrical troubleshooting and is concerned with the calculation of fault currents in electrical power systems. Short-circuit currents are associated with large amounts of very destructive energy and therefore calculations must be made to ensure that the short-circuit ratings of equipment are adequate to cater for these high currents. Accurate assessment of these currents is also essential for determining the settings of the system protection devices.

This course includes the preparation of the system for analysis, by manual calculation and by the use of computer analysis. Participants will be introduced to the various fault analysis software programs.

This course will feature:

Identification of causes of electrical faults
Understanding three phase short circuit currents
Recognition of unsymmetrical faults in transformers
Representation of unsymmetrical faults in a power system
Manual and software assisted of fault currents

What are the Goals?

By the end of this course, participants will be able to:

Understand the various types of fault currents
Determine the causes of overcurrent and short circuit current
Explain differences between symmetrical and unsymmetrical faults
Analyse the common faults in a power system
Interpret manual calculation verses software aided fault current calculations

Who is this Course for?

This course will benefit all levels of personnel in an electrical installation. It will enable them to identify the causes and apply analysis of electrical faults in a power system.

This course is suitable to a wide range of technical professionals but will greatly benefit:

Electricians
Electrical supervisors
Plant electricians
Operations & maintenance engineers, supervisors & technicians
Maintenance technicians

How will this be Presented?

This course will utilise a variety of proven adult training techniques to ensure maximum understanding, comprehension and retention of the information presented. This includes presentation and discussion of case studies (with appropriate solutions), latest videos, technologies, and various commercial fault current analysis software.

Questions are encouraged throughout, particularly at the daily wrap up sessions. This provides opportunities for participants to discuss with the Presenter specific issues and, if possible, find appropriate solutions. Specific goals of each participant will be discussed to ensure that their needs are fulfilled whenever practicable.

The Course Content

Day One

Introduction to fault analysis

Source of fault current in an electrical installation
Common fault statistics of electrical equipment
Short-circuit rating of equipment
Selecting the correct switchgear rating for fault duties
Overview of per-unit system and one line diagrams
Sources of impedance data for all items of plant

Day Two

Three-phase short-circuit currents

Review – summary – discussion
Manual calculation of three-phase short-circuit current
Industrial systems and fault current analysis
Tutorial – based on attendees plant
Cables subjected to short-circuit currents
Compliance with regulations

Day Three

Unsymmetrical fault conditions

Overview of symmetrical components and faults
Consideration of various fault types
Sequence networks
Consideration of phase shift in two-winding transformers
Consideration of earth impedance
Consideration of three-winding transformers

Day Four

Representation of unsymmetrical faults in power systems

Review – summary – discussion
Fault diagrams of electrical equipment
Interconnected sequence networks
Special considerations with reference to limitation of earth fault current
Demonstration examples based on industrial power systems
Introduction to fault current analysis software

Day Five

Computer based calculation of faults

Introduction to a scaled down fault analysis software
Common network faults
Industrial standards namely ANSI, NEC & NFPA 70 compliance
Case studies of faults in a high voltage network
Case study of faults in a low voltage network
Q&A and wrap up session

Day 1

Day 2

Day 3

Day 4

Day 5

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