Online Course 1-2: Phasor Drawings for Relay Testers (4 NETA CTDs)

4.93 out of 5 based on 15 customer ratings
(15 customer reviews)

$39.95 USD

Waveform diagrams contain every detail of an electrical system, but that information can be difficult to understand without a lot of effort. Phasor drawings take the complex information embedded in waveform drawings and convert it into phasor diagrams so that you can see the most important information about an electrical system at a glance. Understanding phasor drawings is probably one of the most important skills that a relay tester must have to be successful!

This course will introduce you to phasors and show you how to convert waveform drawings into phasor drawings so that you can understand what phasors are and how they are created.  You will be able to understand what is happening inside your relay and test-set with these topics:

  • What are Phasors?
  • How to Draw Phasor Diagrams
  • Drawing Phasors with Lagging Angles
  • Drawing Phasors with Different Scales

In a perfect world, these four lessons would be all you needed to become a phasor drawing master. You would be a master at understanding and drawing phasor diagrams in Megger test-sets and GE SR relays but, unfortunately, it seems every manufacturer has a different system for the angles in phasor drawings.  The remaining lessons in this course will help you understand all of the different angle systems used by test-sets from Doble, Omicron, and Manta Test Systems as well as the angle systems used by GE UR and SEL relays:

  • Draw Phasors with Positive Angles
  • Draw Phasors with Negative Angles
  • Draw Phasors with Positive and Negative Angles

You can watch a 10-minute video below that will give you an introduction to the topics covered in this course.

Still not sure if this course is right for you? Test your knowledge with this quick quiz:

Test Your Knowledge


If you can’t answer all of the questions correctly,

Sign Up for the Course Today ($29.95 USD)


Not sure if online training is right for you?  Watch these two videos to see what skills you need for online training and how to navigate the online training course here at Valence Electrical Training Services.

Introduction to Online Training

online protective relay training introduction

All of our online training videos use Flash technology that should work on all Windows computers or tablets. You can view the course on Android tablets with the Dolphin Browser for Android, or on an iPad with the free Puffin Web Browser.  We found that the paid version of Photon Flash Player for iPad had better performance on an iPad.

This course is eligible for 4 NETA Continuing Technical Development Credits (CTDs). NETA Certified Technicians (Level III and Level IV) are required to earn a minimum of 48 CTDs every three years to maintain their certification. For more information about the CTD program and requirements, please contact the NETA office at or 888-300-6382.

Do you want to enroll more than one person to our online training courses?  No problem!  Click the “Enable Group registration” checkbox at the bottom of any course, then choose how many people you want to register before you click “Add to Cart”.  All bulk and coupon prices will still apply. You control who gets enrolled to the course via the “Group Registration” page. Enroll one at a time, or upload your entire team via a simple csv file. We’ll automatically create everything they need to start the course and send them an email with their user name, password, and course links.

15 reviews for Online Course 1-2: Phasor Drawings for Relay Testers (4 NETA CTDs)

  1. 5 out of 5


    practicing always make you better having course material teaching you and showing you gives you a better understanding of what a phasor is

  2. 5 out of 5


    This course allows anyone with little or no knowledge to have an overview of how electrical devices works.

  3. 5 out of 5


    The information in this course was very well presented. The practice sheets make the concepts more easily understood. I would recommend this course to anyone who is involved with Electrical Power Systems.

  4. 5 out of 5


    Great fundamental courses, preparing you for any relay testing out there.

  5. 5 out of 5


    Very good explanations on phasors and testing.

  6. 5 out of 5


    Excellent for NETA CEU’s

  7. 4 out of 5


    Great tool!

  8. 5 out of 5


    This course is a must for anyone that is responsible for testing or maintaining Power Systems.

  9. 5 out of 5


    You should take this course “to further their understanding of 3 phase phasors and vectors”

  10. 5 out of 5


    It is something that is required for the Modern Test Engineer

  11. 5 out of 5


    If you are in relay P&C, you need this course for success in your field

  12. 5 out of 5


    Anyone who loves to be a relay engineer, Chris is the guy who can teach you so well, who can make you be what you wanted to be as a relay engineer.

    He is Second to none when it comes to teaching about relays. He is the Guru :)

  13. 5 out of 5


    In order to clarify already understood concepts and learn new ones in order to make themselves a more confident and reliable relay tester and commissioning tech. Also to be able to mentor in the correct manner to hopefully eliminate some of the so many bad habits of testers in the industry.

  14. 5 out of 5


    For people who feel they may know some details about relay testing but get confused by the different phase angles and phase rotation. It clears up the differences and opens your eyes to the need to be careful when trying to figure out phase rotation.

  15. 5 out of 5


    There isn’t a better, more thorough introduction to phasors that I’ve seen online.

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$39.95 USD

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