Valence Electrical Training Services

Overcurrent Relay Testing Online Seminar – Under Construction

We need your help with our next online seminar about overcurrent relay testing.

What would you like to see in an online seminar about overcurrent relays? Our current rough outline includes:

  • Why Do We Use Overcurrent Protection?
  • Introduction to Fault Studies
    • Calculating Maximum Current With an Infinite Buss
  • Introduction to Coordination Studies
    • Calculating Expected Time Delays from Coordination Studies
    • Converting Current Across Voltages
  • Understanding Fault Types
  • The individual elements will be loosely based on the following chapters from The Relay Testing Handbook: Principles and Practice:
    • Chapter 9: Instantaneous Overcurrent (50) Element Testing
    • Chapter 10: Time Overcurrent (51) Element Testing
    • Chapter 11: Directional Overcurrent (67) Element Testing
  • Each element will include the following relays and test-sets:
    • SEL-351
    • GE-SR-750
    • GE-UR F30
    • What other relays would you like to see?
    • Manta MTS-5100
    • Omicron Test Universe
  • Then we’re thinking about adding Breaker Fail Protection (50BF)

Let us know what you’d like to see in the comments below!

We want to make this as realistic and universal as possible, so we’re looking for overcurrent coordination study examples across three voltages.  If you have a coordination study/arc flash study you can share, drop us a line at [email protected]. We’ll give you credit, a free subscription to the seminar when it becomes available, and make sure everything in the study is anonymous.

We could also use some real short circuit utility contributions for the seminars. Feel free to send us your systems fault capacity with the any of the  following parameters and you might see them in the seminar:

  • kVA, MVA, or Amps with:
    • positive X/R ratio, and
    • negative X/R ratio, and
    • zero  X/R ratio
  • kVA, MVA, or Amps with:
  • 3P X/R ratio, and
  • PP X/R ratio, and
  • PN X/R ratio
  • Per Unit with:
    • Utility Base kVA
    • R+, and
    • R-, and
    • R 0, and
    • X+, and
    • X-, and
    • X 0, and

Please help us make the best online training course possible with your comments and submissions!

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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