GE Technical Tutorial – Protection 101

Tutorial Presenter

This tutorial presents an overview of principles and methods for protecting an electric power system and the associated elements. It also covers the basic concepts on protective device applications and device setting considerations. In addition, high level information regarding bulk power system, substations and major components are provided. Since instrument transformers are integral parts of any protection system, the function and performance of current transformers are incorporated in this tutorial.
Date: 2018 October 18, Thursday
Time: 8:00 am to 12:00 noon
Location: Westin Hotel, Calgary
Topic: Power System Protection Fundamentals
Presenter: GE Staff

  • Define “Protection” and “Protection System”
    • Desirable Protection Attributes
    • Art and Science of Protection
    • Primary Equipment and Components
  • Common protection methods
    • Types of Protection
      • Overcurrent (50, 51, 67)
      • Differential
      • Voltage
      • Frequency
      • Power
      • Distance (Impedance) and pilot schemes
    • Power vs Protection Engineer views
    • Typical Bulk Power System
    • Protection Zones
    • Instrument Transformers
      • Current Transformers
      • Voltage Transformers
    • Switchgear
    • Substation Types


  • Considerations for setting protection relays
    • What information is required to apply Protection
      • One Line Diagrams
      • 3-line diagrams
      • Trip/Control circuit diagrams
      • System Grounding
      • Short circuit studies
        • Information needed for short circuit, load flow and voltage studies
    • Per Unit basics
    • Modeling faults
    • Symmetrical components
  • Highlight of special applications
    • Current Transformer (i.e. CT) performance and saturation
    • Data capture for commissioning, testing and trouble shooting
    • Arc flash

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