html{display:none} PROT 409: Generation System Protection | Schweitzer Engineering Laboratories

PROT 409: Generation System Protection


Engineers who need a comprehensive understanding of the design concepts and methods used in protecting electrical power generation systems should attend this course.

PROT 409 provides an in-depth study of the methods used in designing complete protection systems for generation systems.


Day 1
  • Power System Faults
  • Synchronous Generator Review
  • Generating Station Arrangements and Generator Grounding
  • Class Exercise: Generator Grounding
Day 2
  • Class Exercise: Generator Fault Calculations
  • Generator Fault Protection
  • Class Exercise: Generator Fault Protection
Day 3
  • Generator Abnormal Operation Protection, Part I: Thermal, Current Unbalance, and Motoring Protection
  • Generator Abnormal Operation Protection, Part II: Loss-of-Field, Overexcitation, and Overvoltage Protection
  • Class Exercise: Generator Loss-of-Field Protection
  • Generator Abnormal Operation Protection, Part III: Abnormal Frequency and Out-of-Step Protection
  • Generator Abnormal Operation Protection, Part IV: Breaker Failure, Inadvertent Energization, and Backup Protection
  • Class Exercise: Generator Backup Protection

Note: This course teaches fundamental knowledge but does not provide hands-on experience with SEL relays.

Course Objectives

At the conclusion of this course, students can:

  • Identify the protection requirements of synchronous generators
  • Apply generation system protection principles
  • Identify and select appropriate protection schemes for various generator applications
  • Determine settings for system backup using phase distance and overcurrent elements
  • Apply high- and low-impedance neutral grounding techniques
  • Calculate settings for critical generator protection elements, including:
    • Differential and ground fault
    • Out-of-step protection elements
    • Loss-of-field, overexcitation, and overvoltage
Course Information
Course Base Fees: $USD1,725*

CEUs: 2.1
Available Courses

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Course Requirements


A degree in electrical engineering or equivalent experience is required. In addition, PROT 409 requires completion of PROT 401: Protecting Power Systems for Engineers or the following:

  • Familiarity with electrical power generation systems
  • A basic knowledge of protective relay design, symmetrical components, and power system protection
  • A working knowledge of trigonometry, basic calculus, complex numbers, and phasor concepts

Course Preparation

Please check the General Course Information page for what you should bring to class.