PJM.com will be performing system maintenance on Tuesday, December 2, 2025 from 5:00 p.m. – 7:00 p.m. (1700-1900 hours). During this maintenance, intermittent website outages may occur.
This module will identify the characteristics of the various protection schemes used for transmission lines and identify the expected relay actions for a given fault on a transmission line.
(866) 400-8980 (610) 666-8980 Member Relations