html{display:none} PROT 401: Protecting Power Systems for Engineers | Schweitzer Engineering Laboratories

PROT 401: Protecting Power Systems for Engineers

PDHs: 38

Course Base Fees: $3,000*
* Plus Applicable Tax


Course Information

This is a five-day course.

Course Base Fees: $3,000 USD

PROT 401 provides an overview of the principles and schemes for protecting power lines, transformers, buses, generators, and motors. The course provides basic guidelines for relay application and settings calculation. It also reviews basic power system concepts and describes instrument transformers.

This course is also available as ePROT 401, a self-paced virtual course.


This course is intended for engineers who need a comprehensive understanding of the challenges and solutions for protecting electrical power systems.


Day 1

  • Power System Basics and Balanced Faults
  • Class Exercise: Power System Balanced Faults
  • Symmetrical Components
  • Class Exercise: Symmetrical Components
  • Power System Unbalanced Faults

Day 2

  • Class Exercise: Power System Unbalanced Faults
  • Relaying Fundamentals
  • Instrument Transformers
  • Line Overcurrent Protection
  • Class Exercise: Overcurrent Protection Coordination

Day 3

  • Line Directional Overcurrent Protection
  • Class Exercise: Line Directional Overcurrent Protection
  • Line Distance Protection
  • Class Exercise: Line Distance Protection
  • Line Pilot Protection

Day 4

  • Transformer Protection
  • Class Exercise: Transformer Differential Protection
  • Class Exercise: Transformer Overcurrent Protection
  • Bus and Breaker Failure Protection
  • Class Exercise: Bus Protection

Day 5

  • Generator Protection
  • Class Exercise: Generator Protection
  • Motor Protection
  • Class Exercise: Motor 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 challenges and solutions to power system protection problems.
  • Select the appropriate protection schemes for various applications.
  • Analyze power system faults for balanced and unbalanced conditions using symmetrical components.
  • Describe current and voltage transformers and their impact on protection scheme performance.
  • Identify, apply, and calculate settings for distribution and transmission line protection schemes, including overcurrent, directional overcurrent, distance, and pilot protection schemes.
  • Identify and apply power swing blocking and out-of-step tripping schemes.
  • Identify, apply, and calculate settings for transformer, bus, and breaker failure protection schemes.
  • Identify, apply, and calculate settings for generator and motor protection schemes.

Student Background and Knowledge

A degree in electrical engineering or equivalent experience is recommended. In addition, we recommend that you have:

  • A basic knowledge of power systems.
  • A working knowledge of ac three-phase electrical circuits, trigonometry, basic calculus, complex numbers, and phasor concepts.

Recommended reading:

  • Any electric machinery book of your choosing that covers transformers, synchronous generators, and induction motors.
  • Any power system analysis book of your choosing that covers per-unit quantities, symmetrical components, and fault analysis.

Available Courses

Brookfield, WI, USA
May 1–5, 2023
Bloomington, MN, USA
June 5–9, 2023
Charlotte, NC, USA
August 7–11, 2023
Phoenix, AZ, USA
October 23–27, 2023

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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.