PROT 415: Time-Domain Line Protection

Course Length: 2 Days (PDHs: 15)
Course Based Fees: $1,200*
* Plus Applicable Tax


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

Learning Outcomes

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.

Click here to view our recommended reading on these topics:

  • Electric circuit analysis
  • Power systems that cover symmetrical components, fault analysis, and electrical transients in power systems

Additional information is on the Course Policies and FAQ pages.

Available Courses

Request onsite training for your company.