Valence Electrical Training Services

Good Video for CT / PT / Phasor Diagram / Transformer Connections

Here is another excellent, but dated, video that covers a lot more than its title.

It starts with an excellent introduction to CTs and PTs (

Then some Phasor Diagram basics at 26:10 (

Then it discusses transformer connections and one method for calculating phase shifts at 30:18 (

It starts to get heavy into per unit calculations at 40:20 which is nice to know, but not something that a relay tester has to deal with often.

Our first video is getting close to finished and should be out soon.

About the Author Chris Werstiuk

Chris is an Electrical Engineering Technologist, a Journeyman Power System Electrician, and a Professional Engineer. He is also the Author of The Relay Testing Handbook series and founder of Valence Electrical Training Services. You can find out more about Chris here.

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