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

PROT 411: Substation Equipment Protection

CEUs: 3.2
PDHs: 32

Course Base Fees: $2,400 USD*
* Plus Applicable Tax


PROT 411
Course Information

This is a 3 and 1/2 day course.

Course Base Fees: $2,400 USD

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


  • Overview of Power System Faults
  • Relaying Fundamentals
  • Instrument Transformers (includes a class exercise)
  • Overcurrent Protection Principles (includes a class exercise)
  • Differential Protection Principle
  • Bus Protection (includes a class exercise)
  • Transformer Differential Protection
  • Transformer Protection Exercise
  • 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.

Student Background and Knowledge

Before you attend this class, we recommend that you have a degree in electrical engineering or equivalent experience. In addition, we recommend that you complete PROT 401: Protecting Power Systems for Engineers OR have 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.

Available Courses

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Course Preparation

Digital course materials: A link to download the digital course materials will be sent via email 2 weeks prior to the course, and a workbook will be provided on the first day.

Additional information is on the Course Policies and FAQ pages.