The Power Substation Fundamentals Course: Theory, Equipment, Earthing, and Design

This course tackles the most important aspects of a power substation (basic theory, electrical equipment, earthing, and design guidelines). It consists of 3 lessons, 29 topics in 5h 01m total course duration.

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Course Description

Welcome to our course “The Substation Fundamentals Course”. A power substation is an essential part of an electrical generation, transmission, and distribution system. The assembly of apparatus used to change some characteristics (e.g. voltage, frequency, p.f., A.C. to D.C., etc.) of an electrical supply is called a substation.

This course tackles the most important aspects of a power substation (basic theory, electrical equipment, earthing, and design guidelines).

Power substations have switching, protection and control equipment, and transformers. In a large substation, circuit breakers are used to interrupt any short circuits or overload currents that may occur on the network. Smaller distribution stations may use recloser circuit breakers or fuses for the protection of distribution circuits.

Substations themselves do not usually have generators, although a power plant may have a substation nearby. Other devices such as capacitors and voltage regulators may also be located at a substation.

This 5-hour course will discuss the following topics related to electrical power substations:

  • Function, classification and voltage of electrical substations.
  • Main components like power transformers, conductors, insulators, switch gears, current transformer, capacitor voltage transformer and voltage transformer.
  • Different types of circuit breakers, relays and their classification according to time, construction and function.
  • Difference between circuit breaker and fuse, in addition to their applications.
  • Definition of IP or ingress protection.
  • Grounding system including the effect of current on human body and components of grounding system.
  • Types of electric hazards and classification of earthing system.
  • Measuring the earthing resistance by Megger and three point method.
  • Design of an earthing system using ETAP program.
  • Ring main unit and its importance in electrical power system.
  • Types of switches used in electrical power system and substations.
  • Overhead transmission lines, underground cables and difference between them.
  • Busbars in power system, its importance, its different schemes and how to select them.
  • Lightning arrester and wave trap which are used in substations.
  • Air and gas insulated substations.
  • Design of power substation and single line diagram of 66/11 kV substation.

Course Overview

  • The purpose of electrical substations
  • Insulators & conductors, and their importance in power system
  • Instrumental transformers including the current & potential or voltage transformer
  • Electrical substation design
  • Ring main unit in power system

Who Is This Course For

  • Anyone who wants to learn about Electrical Engineering Power Systems.
  • Electrical Draughtsmen and Designers


  • Just Passion and Patience for Learning.

Downloadable course documents

After purchasing the course, students can download the following documents:

  • Electrical Substations Slides (.pdf)
  • Design Guide for rural power substations (.pdf)
  • Design of 500 kVA 11-0.415 kV power substation (.pdf)
  • Design overview and analysis of 11-0.415 kV, 500 kVA power substation in Nigeria (.pdf)
  • Best practice in HV substation construction projects (.pdf)
  • Voltage and current measurement in modern digital high voltage substations (.pdf)
  • The basics of high voltage switching equipment in power substations and switchyards (.pdf)
  • Earthing System Slides.pdf
  • Earthing system calculation for 132-11 kV, 1×40 MVA substation of steel factory (.pdf)

Course Content

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About Instructor

Ahmed Mahdy

I am an electrical power engineer, and I am also an electrical instructor at more than 30 platforms, teaching electrical engineering to more than 60,000 students from more than 170 countries. I also work in the electrical research field on topics related to power system stability, renewable energy systems, electric vehicles, and control systems.

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Course Includes

  • 3 Lessons
  • 29 Topics
  • Course Certificate
  • Lifetime Access