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

PROT 415: Time-Domain Line Protection

PDHs: 15

Course Base Fees: $1,200*
* Plus Applicable Tax


PROT 407
Course Information

This is a two-day course.

Course Base Fees: $1,200 USD

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.


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.


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.

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 and PROT 407: Transmission Line Protection OR have 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.

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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.