How Current Transformers Work

Learn about current transformers (CTs), their purpose in metering and protection, and how they accurately measure high currents using magnetic fields and secondary windings.

Last updated November 18, 2024
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About the video

This lesson explains the fundamental workings of current transformers (CTs), devices used to safely measure high currents by reproducing them at a lower, more manageable level for metering and protection. By applying Maxwell’s equations, particularly Ampere’s law, you’ll understand how a CT uses a magnetic core and secondary winding to produce a current proportional to the primary current flowing through the main loop. The video covers the various types of CTs, including solid core, split core, and clamp-on styles, and their applications in different voltage environments. You’ll also learn about CT accuracy, protection against faults, and how CTs are used in conjunction with circuit breakers and relays for effective system monitoring and protection. To get started, go to the Lesson Content tab and click on the video.

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Each lesson contains a video, and is followed up with a simple quiz. Quizzes review information discussed within the video, with each question providing an answer justification. Helping to reinforce correct answers and helps clarify any mistakes through code citations, excerpts, and explanations, so you can better understand the material.

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