html{display:none} PROT 407: Transmission Line Protection | Schweitzer Engineering Laboratories

PROT 407: Transmission Line Protection


Engineers and power system consultants who need a comprehensive understanding of the challenges and solutions for protecting high-voltage power transmission lines should attend this course.

PROT 407 provides an in-depth study of the methods used in designing protection systems for high-voltage power transmission lines. The course provides advanced guidelines for relay application and settings for transmission lines, including series-compensated lines. It also reviews time-domain ultra-high-speed line protection principles. The course covers the application and settings of power swing blocking and out-of-step tripping functions.


Day 1
  • Power System Faults
  • Transmission Line Overview
  • Relaying Fundamentals
  • Instrument Transformers
  • Line Directional Overcurrent Protection
Day 2
  • Class Exercise: Line Directional Overcurrent Protection
  • Line Distance Protection, Part 1
  • Line Distance Protection, Part 2
  • Class Exercise: Distance Protection
  • Line Directional Comparison Protection
Day 3
  • Line Current-Based Protection
  • Time-Domain Line Protection
  • Series-Compensated Line Protection
  • Power Swing Blocking and Out-of-Step Tripping

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 transmission line protection problems
  • Select the appropriate transmission line protection schemes for various applications
  • Describe current and voltage transformers and their impact on transmission line protection scheme performance
  • Identify, apply, and calculate settings for transmission line protection schemes, including directional overcurrent, distance, and pilot protection schemes
  • Describe the various pilot protection schemes for transmission lines
  • Discuss the advantages of line current differential protection
  • Describe time-domain ultra-high-speed transmission line protection
  • Identify the challenges and solutions to series-compensated transmission line protection
  • Identify and apply power swing blocking and out-of-step tripping 
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 407 requires completion of PROT 401: Protecting Power Systems for Engineers or the following:

  • Familiarity with transmission line characteristics.
  • A basic knowledge of protective relay design, symmetrical components, fault analysis, 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.