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Power System Protection: Part One

This course provides an essential introduction to the principles of power system protection.

It covers the role of protection, why it is required, components of protection systems and their principles of operation. It goes on to provide an understanding of basic protection theory, grading principles and fault calculations. The course includes practical exercises and builds a fundamental understanding of protective systems on electrical networks from LV up to 132kV.


Day one

Role of Protection

  • Contribution in network design
  • Safety requirements
  • Principles

Components & 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 Calculation


  • 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.


Course duration 2 Days

Course Location Capenhurst, Chester

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

12 Hours allocated

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