Valence Electrical Training Services

How to Test Overcurrent Relays: An Introduction to Protective Relaying Online Seminar – 2022 Update

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I hoped we’d be releasing our new online seminar by now, but I did not expect that it would require 46+ topics and 140+ videos to properly demonstrate all aspects of electro-mechanical relay testing with five different test-sets and two example relays. It’s been a long slog because we review every video at least 8 times after it’s recorded to make sure that you are getting the best quality. Here’s what we have planned so far:

Online Seminar: How to Test Overcurrent Relays – Under Construction

Lesson 1- Introduction to Protective Relays

  1. History of Electrical Protection
  2. What Are Relays For?
  3. Introduction to Relay Inputs
  4. Introduction to Current Transformer (CT) Theory
  5. Introduction to Current Transformer Saturation
  6. Current Transformer Nameplate and Specifications
  7. Current Transformer Nameplate Burden and Saturation Voltage
  8. IEC vs NEMA CT Nameplate Information
  9. How Relays Protect Equipment
  10. How Relays Ignore System Fluctuations
  11. How Overcurrent Relays Coordinate
  12. Introduction to Zones of Protection
  13. Relay Output Basics

Lesson 2 – Testing Electro-Mechanical Relays

  1. Electro-Mechanical Relay basics
  2. Take a Tour of E-M Relay Components
  3. What to Look for in the E-M Relay’s Instruction Manual
  4. Test-Set Current Channels – Current & VA Specifications
  5. Test-Set Current Channels – Voltage Requirements
  6. Test-Set Current Channel Capabilities
  7. Configuring Test-Set Current Channels for Different Relays and Taps
  8. How to Connect Your Test-Set Current Channels to the Relay
  9. How to Make Test-Set to Relay Sensing Connections
  10. How to Connect to the Relay
  11. How to Connect Your Test-Set to the Relay
  12. How Not To Perform a Pickup Test
  13. How to Choose the Correct Step Size
  14. How to Perform an E-M Relay Pickup Test
  15. How to Evaluate Your Pickup Test Results with Percent Error Calculations
  16. Why You Can’t Always Use Percent Error Tolerances
  17. How to Apply Tolerances to Test-Set Software
  18. How to Apply Percent Tolerances to Test-Set Software When the Expected Value is 0
  19. How to Perform a Manual E-M Pickup Test with Your Test-Set
  20. How to Perform an Automated E-M Pickup Test with Your Test-Set
  21. How to Adjust the Pickup on Electro-Mechanical Inverse-Overcurrent Relays
  22. What Are TCC Curves and Why Do They Matter?
  23. How to Determine Test Points and Time Delays
  24. How to Prepare for 51-Element Time Tests
  25. How to Perform Manual 51-Element Time Tests with Your Test-Set
  26. How to Perform Simple 51-Element Time Tests
  27. How to Perform 51-Element Time Tests Using Curves With Your Test-Set
  28. How to Perform 51-Element Time Tests Using States With Your Test-Set
  29. How to Adjust the Timing on an Electro-Mechanical Relay
  30. Introduction to E-M 50-Elements
  31. How to Perform a 50-Element Pickup Test
  32. How to Perform a Manual 50-Element Pickup Test With Your Test-Set
  33. How to Perform a 50-Element Pickup Test With Your Test-Set
  34. How to Adjust a 50-Element Pickup on an Electro-Mechanical Relay
  35. How to Perform a 50-Element Pickup Test With Multiple Elements
  36. Introduction to E-M Targets
  37. How to Test E-M Targets
  38. How to Use a Test-Set to Test E-M Targets
  39. How to Manually Test E-M Targets With Your Test-Set
  40. How to Test E-M Targets With Your Test-Set
  41. How to Test E-M Relays Using Your Test-Set’s Pre-Built Test Plans
  42. How to Perform an Mechanical Inspection of the Cover and Case
  43. How to Perform an Mechanical Inspection of the Relay
  44. How to Perform an Mechanical Inspection of the Relay’s Contacts
  45. How to Perform a Creep Test
  46. How to Perform a Mechanical Zero Test
  47. How to Perform an Insulation Resistance Test
  48. How to Verify the Relay’s Trip Circuit (NERC)
  49. How to Safely Put the Relay Back Into Service
  50. How to Verify the In-Service Relay Inputs (NERC)
  51. Putting it All Together – How to Test an Electro-Mechanical Overcurrent Relay From Start to Finish
  52. All the Extras – Downloads, Credits, and Additional Training options

Lesson 3 – Understanding Power System Faults

  1. Overcurrent Relays Under Normal Conditions
  2. What Happens During a Fault and How Relay Engineers Create Relay Settings
  3. Fault Voltage and Fault Current During 3-Phase Faults
  4. How Electro-Mechanical Overcurrent Relays Respond to 3-Phase Faults
  5. Fault Current Magnitude and Direction in P-P Faults
  6. Fault Current vs. Phase Current in P-P Faults
  7. Fault Voltages in Phase-to-Phase Faults
  8. What Phase Voltages Look Like During Phase-to-Phase Faults
  9. Fault Voltages and Fault Current in Phase-Phase Faults
  10. How E-M OC Relays Respond to PP Faults
  11. Fault Voltage and Fault Current in 1P Faults
  12. How E-M OC Relays Respond to PN Faults
  13. Benefits of E-M OC Relays
  14. What Faults Really Look Like
  15. Why You Should Apply Realistic Faults When Testing E-M Relays

Lesson 4 – Testing Simple Overcurrent Microprocessor Relays

Lesson 5 – A Quick Introduction to Fault Studies

Lesson 6 – A Simple Way to Test Modern Digital Feeder Relays

Let me know if there is something specific you want to see in the comments section below before its too late.

I’ve given up on predicting release dates, but we can see the end of the tunnel and I hope it happens soon.

In the meantime, make sure you are subscribed to our TechTalk newsletter to get discounts and advanced entry to the course before it is available to the public.

Stay safe out there!

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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