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

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9 Lessons

We discussed how waveforms and frequencies are created in the high voltage electrical world in our first online protective relay training course, The Three-Phase Electric Power System.  Waveform drawings depict every detail of a power system, but you have to be a special kind of person to look at a waveform drawing and accurately understand what is happening in any given moment. Phasor drawings were created to simplify waveform drawings into a diagram that can tell you a lot about the electrical system at a glance.

This phasor diagram online training course will show you how to convert waveform drawings into phasor diagrams so that you understand what is happening under the hood of protective relays, electrical meters, and protective relay test-sets to help you become a master at drawing and understanding phasor diagrams.

Phasor diagrams represent a common language that helps communicate complex information between electrical personnel and equipment, so you would think it would be important that all devices and personnel speak the same language. Unfortunately, phasor diagrams can be drawn using several different "dialects" depending on the manufacturer and model of the equipment, and the background of the personnel. A phasor drawn at 120° on a phasor diagram from Megger would be represented as -120° on Omicron test-sets or 240° on Doble test-sets. Some relay manufacturers can't even agree on the correct angle designations within their own product lines.

This course will demonstrate all of the different phasor diagram "dialects" so that you will be able to recognize any phasor diagram dialect, correctly interpret it, and then be able to convert it into another dialect so that you can test any relay with any test-set.

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

You should be able to see an animation at the top of this page. All of our online training videos use Flash technology that should work on all Windows computers or tablets using one of the links below to watch flash on with your browser.

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 [email protected] or 888-300-6382.

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Test Your Knowledge

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