Online Seminar 1: How to Test Overcurrent Relays: An Introduction to Protective Relaying Online Seminar – Under Construction (32 CTDs)

6 Lessons

Are you new to relay testing and want to get a good foundation so that you are ready when you get thrown to the relay testing wolves?

Or have you already been thrown to the wolves and don’t feel confident that you have been testing relays properly?

If so, this seminar covers the basics of overcurrent protection that new relays testers should know before they start testing relays. It will also fill in gaps for self-taught relay testers who had to figure it out for themselves and want to truly understand how to test all overcurrent relays from any manufacturer with any test-set.

This seminar starts at the very beginning by defining the basic operating characteristics that you will find in all relays to help you understand why techs test relays the way they do and what failure points you should be looking for inside the relays you test. All overcurrent relays are fed from current transformers (CTs), so we also explain how CTs operate, why a saturated CT is bad, and how you can check to make sure that the CTs are properly installed on the power system.

Electro-mechanical relays were the backbone of the power system for over a century and are a great teaching tool because you can see what’s happening inside the relay while you are testing it. Most digital overcurrent relay elements are really just modeling electro-mechanical overcurrent relays, so being able to test and visualize an electro-mechanical relay will help you test any relay. Therefore, the second lesson shows you how to test electro-mechanical overcurrent relays, which sets you up with the basic skills and understanding that you can use for all relay testing.

I thought this was going to be a nice short lesson, but we want to fill in all of the blanks in your relay testing knowledge. That means that we explain every step of the relay testing process. For example; we don’t just don’t tell you to parallel channels when your test-set amplifiers overload, we explain why your amplifiers are overloading and what happens when you parallel channels…and why paralleling too many channels can actually make the problem worse. We spend a lot of time explaining the why of relay testing techniques so that you can apply the correct test procedure when something goes wrong. Then we go through step-by-step procedures with multiple relay and test-set examples that will prepare you to test your relays with your test-sets. You can download test sheets, checklists, and detailed testing instructions that you can use at your site to make sure you are testing your electro-mechanical relays correctly.

The third lesson describes the most common kinds of power system faults so that you can troubleshoot problems after a relay operates…and test any relay with realistic fault simulations using your electro-mechanical relay testing techniques to test any relay with any test-set.

The fourth lesson will show you how the skills you learned in the electro-mechanical lesson can be applied to any relay using a simple digital overcurrent relay (i.e. Basler BE1-51) example. Digital relays have different failure points, so we explain why you need to modify the electro-mechanical test procedures slightly when testing single-function, multi-phase, simple digital relays. Then we show you step-by-step test procedures using multiple test-sets along with test sheets, checklists, and detailed testing instructions that you can download and use at your site.

We strongly believe that if you truly understand the theory of a topic, you will be a better relay tester. The fifth lesson will give you a peak behind the curtain and show you how a relay engineer uses engineering studies to create relay settings, which will help you understand what you are testing and find setting mistakes, which are the most common reasons why relays mis-operate when in-service. We also show you how to search through a coordination study to find the relay settings and create test points that make sure the correct settings have been applied the easy way without needing to decode digital relays settings.

In the final lesson, we discuss why modern relays should really be called intelligent electronic devices (IEDs). These “relays” may share some features with traditional overcurrent relays, but they are much more complicated and have significantly different failure points. Traditional test techniques simply aren’t designed to find the most common problems inside IEDs, but we show you how to take all of the knowledge and techniques learned in this seminar and apply them to IEDs with the updated overcurrent element testing plan described in this lesson. As usual, there are step-by-step test procedures using multiple test-sets along with test sheets, checklists, and detailed testing instructions that you can download and use at your site to test the overcurrent elements inside this seminar.

How it Works:

This online seminars contains over 30 hours of videos (usually less than 15 minutes each) that you can watch at your own pace in any order with an internet connection. When you purchase the seminar with your credit card, you will have unlimited, 24/7 access to all the videos with no expiration date. Each video has closed captioning, fast-forward/rewind/play speed controls, and you can revisit the videos whenever you wish. We try to follow a “show don’t tell” philosophy in all our videos and use realistic conditions as much as possible. This seminar isn’t just a bunch of pre-recorded webinars and power point slide presentations. You will watch the instructor test different relays with different test-sets and explain what he is doing every step of the way. We didn’t cut out the mistakes he made while testing and creating the settings, so you will also see how to troubleshoot problems when they happen.

You will get a certificate of achievement when you complete all of the topics and lessons in the seminar that you can use for continuing education credits with your organization. There are too many accreditation organizations for us to keep track of, so we are only seeking pre-approval from NETA. Please let us know if you need any help getting accreditation with your organization. We will do the best we can to help you.

We have applied to NETA to pre-approve the seminar for 32 NETA CTDs and are waiting to hear back. This process has taken up to six months in the past and we’ll make an announcement when the credits are approved. You do NOT need pre-approval to request CTDs from this seminar in the meantime. Pre-approval just means that NETA will automatically apply 32 CTDs if you finish the seminar. There is a manual approval process for courses that are not pre-approved.

The following pages detail the lessons and topics in this seminar:

Introduction to Protective Relays

L02-How to Test Electro-Mechanical Overcurrent Relays

L03-Understanding Power System Faults

OS2-L04-How to Test Simple Digital Overcurrent Relays

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OS2-L05-Introduction to the Power System Studies Used to Create Relay Settings

OS2-L06-How to Test Overcurrent Elements in IEDs


    1. Chris Werstiuk Post author

      I’ve given up on estimating release dates.

      I’ll be finished recoding lesson 2 this week, and maybe lesson three next week.

      Two out of the three lessons after that should be pretty fast.

      The Engineering study lesson is an unknown at this point.