html{display:none} PROT 411: Substation Equipment Protection | Schweitzer Engineering Laboratories

PROT 411: Substation Equipment Protection


Engineers who need a comprehensive understanding of the design concepts and methods used in protecting high-voltage electrical substation bus and power transformers would benefit from this course.

PROT 411 provides an in-depth study of the methods used in designing protection for high-voltage power transformer protection and substation bus protection.


Day 1
  • Overview of Power System Faults
  • Relaying Fundamentals
  • Instrument Transformers (includes a class exercise)
  • Overcurrent Protection Principles (includes a class exercise)
Day 2
  • Differential Protection Principle
  • Bus Protection (includes a class exercise)
  • Transformer Differential Protection
  • Transformer Protection Exercise
Day 3
  • Transformer Nondifferential Protection
  • Transformer Overcurrent Protection Exercise
  • Substation Trip Circuits and Breaker Failure

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:

  • Describe the protection requirements of power transformers and buses
  • Specify current transformers for protective relay applications
  • Define transformer protection issues and identify solutions using digital relays
  • Define bus protection problems and identify solutions for digital relays
  • Calculate relay settings for transformer and bus protection relays
Course Information
Course Base Fees: $USD1,725*

CEUs: 2.1
Available Courses

There are currently no courses available. Request to be notified when this course is added to the schedule.


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Course Requirements


A degree in electrical engineering or equivalent experience is required. In addition, PROT 411 requires completion of PROT 401: Protecting Power Systems for Engineers or the following:

  • Familiarity with wye and delta transformer connections
  • 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.