Hide noticeIf you are in North America, South America, or the Caribbean Click here

Power System Protection: Part One

This course provides an essential introduction to the principles of power system protection. Covering the fundamental role of protection, key components including fuses and relays, their principles of operation the course goes on to provide an enlightening introduction to grading principles and basic fault calculations. The course includes practical exercises and a ‘walk through’ the LV and HV system.

It provides a very detailed introduction to essential protection principles at a level that does not require knowledge of complex numbers. It is designed to lead on to the Power Systems Protection: Part Two course which takes delegates on to protection theory, practice and calculations at a level that does involve complex numbers.

  • Understand why protection is critical on electrical networks
  • Develop an understanding of protection systems for power assets
  • Understand the role of protection in network design
  • Develop an understanding of fault calculations
  • Be able to apply learnt skills directly in your place of work
  • Understand safety requirements in power network protection

Day one

Role of Protection

  • Contribution in network design
  • Safety requirements
  • Principles

Components and Operation

  • LV and MV fuses – characteristics and construction
  • Time limit fuses and CT release
  • Relays, basic principles, Inst, DT, IDMT, O/C & EF

Introduction to Grading

  • Current and time grading
  • Fuses
  • IDMT
  • Definite time
  • Practical exercise

LV Networks Protection

  • Principles
  • Walk through the LV system

Day two

HV Networks Protection

  • Principles
  • Walk through HV network system

Basic Fault Calculations


  • Construction and operation
  • HV and LV fuses
  • LV fuse grading

LV ACB Electronic Relays

  • Basic principles
  • Settings explained
  • Plotting characteristics on log-log paper
  • Additional features

Programme may be subject to amendment

View full course schedule


Course duration: 2 days


CPD Information


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

Subscribe for updates

* Please enter an email address