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  • Reading time:5 mins read

This course aims to teach you all the fundamentals of Current Transformer in much detail.

What you will learn

What are CTs and where do we use them

Learn about polarity marks and CT ratio

Connect CTs in different configuration

Explore important characteristics of CT

Unlock easy way to model equivalent circuit of CT

How CT should be sized for protection and metering

Importance of CT grounding

Learn how to analyze the behavior of CT

Important parameters of CT

Explore CT burden, winding resistance, and Leakage reactance


Current transformer is an essential part of every Power System. We all might know the purpose of Current Transformer but we hardly understand how the current is flowing even though we know about polarity marks but it’s still confusing and complex to have all the fundamentals of current transformer on our fingertips. This course combines brief introduction to Current Transformer with its main characteristic and applications. You will emerge with the knowledge in principles, working, applications, sizing of CT that empowers you to have strong grip on the fundamentals of Current Transformer.

I have been creating high quality video tutorials about Power Systems since 2015 and focus specifically on the fundamentals. It is dedicated to the people who make power and energy work and make sure that Power Systems are safe, reliable, operable, protected and well designed. But it takes time and money to continue delivering high quality video tutorials. My goal is incredibly simple. I want to make Power Systems Intuitive, Open and Free to everyone, everywhere. Your purchase will allow me to keep making valuable technical videos free for those who can’t afford it and keep the doors of knowledge open to everyone. Thank you for supporting me.

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See you on the other side. Thank you and take care.



Welcome to the Course !!

About the Instructor
Quick word from GeneralPAC

Introduction to Current Transformers

CTs & Their Applications
CT Polarity
CT Ratio
Wye Connected CTs
Delta Connected CTs – Part 1
Delta Connected CTs – Part 2
CT Model

Brief Intro to Current Transformers

CT vs Power Transformer
Characteristics of CT
CT Accuracy & Importance
CT Sizing & Saturation
CT Saturation & Involved Parameters
CT Polarity & Its Use For Connections
CT Grounding

Current Transformer Equivalent Circuit Model

Parameters & Equivalent Circuit of CT
Excitation Current & Curve
CT Burden

Current Transformer Fundamental Assessment

Time to test your knowledge !!