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Electrical Transformers Explained: Low Voltage Systems.
16 students

Electrical Transformers Explained: Low Voltage Systems.

Learn how transformers work, how to test them, and how they are used in real electrical systems — explained simply.
Created byDeon Jacobs
Last updated 5/2026
English

What you'll learn

  • Understand how Low Voltage Transformers Work and how to Connect them.
  • Learn how to Calculate the output Voltages on Transformers.
  • Learn about Potential Transformers and Current Transformers.
  • Gain a good understanding of How Energy Meters work and how to Connect them.
  • Learn how the Relay Panel works on a Trade Test.

Explore related topics

Course content

3 sections • 17 lectures • 3h 20m total length

  • Working of a Transformer.10:07

    In this Video Tutorial you will Learn how a Transformer works.

  • Step Down Transformer Calculations.11:54

    In this Video Tutorial you will Learn how to do Calculations for Step Down Transformer.

  • Step Up Transformer Calculations.8:22

    In this Video Tutorial you will Learn how to do Step Up Transformer Calculations.

  • Transformer Power Factor.4:22

    In this Video Tutorial you will Learn what Power Factor is and how it effects Output Voltage.

  • Power Factor Calculations.7:32

    In this Video Tutorial you will Learn how to do Power Factor Calculations to determine the Correct Output Voltage.

  • Transformer Star Delta Connections.13:06

    In this Video Tutorial you will Learn how to Connect 3 Single Phase Transformers in different Star Delta configurations.

  • 3 Phase Transformer Calculations.23:18

    In this Video Tutorial you will Learn how to do the Calculations of 3 Single Phase Transformers that get connected in Different Star Delta Configurations.

  • Connecting 3 Single Phase Transformers in Star Delta Configurations.15:07

    In this Video Tutorial I show you how to connect 3 Single Phase Transformers in the Different Star Delta Configurations and the outcomes.

  • Transformer Tapping's Calculations.18:38

    In this Video Tutorial you will Learn how the Tapping's of a Transformer work and how to do the Calculations.

  • PT Connected to Voltmeter with a Selector Switch.9:34

    In this Video Tutorial you will Learn How a Potential Transformer works and how to connect it into a Circuit using a Selector Switch.

  • Ringing out a Voltmeter Selector Switch.8:37

    In this Video Tutorial you will Learn how to Ring Out the Selector Switch for a Volt Meter.

  • CT Connected to an Ammeter with a Selector Switch.9:37

    In this Video Tutorial you will Learn how a Current Transformer Works and how to Connect it into a Circuit using a Selector Switch.

  • PT's and CT's in a Trade Test.3:48

    In this Video Tutorial you will get a good idea of how PT's and CT's are wired in a Trade Test.

Requirements

  • You need the foundation of Electricity before attending this course.
  • Please complete the Basics of Electricity Course first.

Description

In this Online Course I will teach you how Transformers work, How they get Connected, How to do Transformer Calculations and How PT's and CT's get Connected. I have added extra material just to assist you with more Trade Test Preparation which is Energy Meters and Relay Panel. Course is around 3H20 to complete.

1) Working of a Transformer – Teaches how a basic transformer works. (10:07)

2) Step Down Transformer Calculations – Learn how to calculate Voltages and Current on a Step Down Transformer. (11:54)

3) Step Up transformer Calculations - Learn how to calculate Voltages and Current on a Step Up Transformer. (8:22)

4) Transformer Power Factor – Learn what Power Factor is and its effects in a Transformer. (4:22)

5) Power Factor Calculations – Learn how to do Calculations with Power Factor. (7:32)

6) Transformer Star Delta Connections – Learn how to connect 3 Single Phase Transformers in different configurations. (13:06)

7) 3 Phase Transformer Calculations – Learn how to calculate the output Voltages when connecting transformers in Star Delta configurations. (23:18)

8) Connecting 3 Single Phase Transformers in Star Delta Configurations – Practical video on the actual connecting of 3 Single Phase Transformers in Star Delta configurations. (15:06)

9) Transformer Tapping's Calculations – Learn how to calculate output Voltages on Transformers with Tapping's. (18:38)

10) PT Connected to a Voltmeter with a Selector Switch – Learn how Potential Transformers work and how to connect them using a Selector Switch. (11:30)

11) Ringing out a Voltmeter Selector Switch – Gain understanding of how to ring out a Voltmeter Selector Switch. (8:37)

12) CT Connected to an Ammeter with a Selector Switch – Learn how a Current Transformer works and how to connect it to a Selector Switch. (9:37)

13) PT’s and CT’s in a Trade Test – Learn what is expected of you in Trade test when connecting PT’s and Ct’s. (3:48)

14) Energy Meter Connections – Learn how to connect 3 Single Phase Energy Meters to a 3 Phase supply and how to connect a 3 Phase Energy Meter. (9:19)

15) Energy Meters in Trade Test – Learn what is expected of you in Trade test and how to Balance the Loads across the 3 Phases. (13:45)

16) Relay Panel – Get a better understanding of how the Relay Panel works and what is expected of you in Trade Test. (19:10)

17) Fault Finding on a Relay Panel – Learn how to identify faults on the Relay Panel and record your findings (14:42)

Who this course is for:

  • Anyone with Electrical knowledge that wants to upskill themselves.
  • Students who want to prepare themselves for an Electrical Trade Test.

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