Distance Protection of Transmission Lines | Example Using the SEL-421 Protection Relay

Download our free 28-page power system protection fundamentals text-based course: https://www.romeroengineering.co/protection-and-control-fundamentals Online Courses: https://www.romeroengineering.co/courses SEL-421 Mho Element Plotter Spreadsheet: https://www.romeroengineering.co/downloads-mho-element-plotter In this video we discuss how to protect a transmission line implementing a distance protection scheme using the SEL-421 protection relay as an example. We go over how to calculate the Zone 1 (underreaching) and Zone 2 (overreaching) settings to develop a robust protection scheme that protects the entire transmission line. Sign up to our online course membership at: https://www.romeroengineering.co/offers/FRPvBQDG/checkout Book a one-on-one training session with Ricardo: https://www.romeroengineering.co/offers/ZEo7VkVz/checkout 00:00 Intro 00:30 Mho element plotter spreadsheet 02:35 Zone 1 04:03 Zone 2 05:10 Example transmission line settings 12:30 Programming the SEL-421 Relay