html{display:none} PROT 415: Time-Domain Line Protection | Schweitzer Engineering Laboratories

PROT 415: Time-Domain Line Protection


This course is intended for utility transmission protection engineers and power system consultants who need a comprehensive understanding of the new ultra-high-speed time-domain line protection principles and applications.

After a refresher of power system faults and protection concepts, PROT 415 provides an in-depth study of incremental-quantity-based line protection elements. The course also covers traveling-wave protection elements and schemes in detail. Finally, the course covers fault-locating methods, including the new, highly accurate methods based on traveling waves launched by faults.


Day 1
  • Power System Faults
  • Transmission Line Overview
  • Relaying Fundamentals
  • Class Exercise: Relaying Fundamentals
  • Instrument Transformers
Day 2
  • Class Exercise: Instrument Transformers
  • Line Directional Overcurrent, Distance, and Pilot Protection
  • Incremental-Quantity Protection Elements
  • Traveling-Wave Protection Elements
  • Fault Locating

Course Objectives

At the conclusion of this course, students can:

  • Describe the need for fast fault clearing
  • Identify the limitations of phasor-based protection
  • Describe the challenges and solutions of line time-domain protection
  • Discuss power line models
  • Describe signal processing in microprocessor-based relays
  • Discuss current and voltage transformers and their impact on line time-domain protection performance
  • Describe incremental-quantity protection elements
  • Describe traveling-wave protection elements
  • Discuss traveling-wave fault locating
Course Information
Course Base Fees: $USD1,150*

CEUs: 1.4
Available Courses

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Course Requirements


A degree in electrical engineering or equivalent experience is required. In addition, PROT 415 requires completion of  PROT 401: Protecting Power Systems for Engineers and  PROT 407: Transmission Line Protection 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.