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 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.

Course Information
Course Base Fees: $1,725 USD*
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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