The use of digital protective relay technologies is changing and advancing the management and control of transmission and distribution (TAndD) grids. Widely deployed supervisory control and data acquisition (SCADA) systems collect grid status data at 4- to 5-second intervals; unfortunately, this is too infrequent to reveal many of the disturbances that cause protective relays to trip. As such, historically, these disturbances remained undetected by TAndD system operators, which have not been able to respond or complete forensic analysis following outages. Today, the capabilities of advanced protective relays (ADVPRs) have evolved, and more powerful, intelligent modules have been added. Advanced sub-second monitoring, data collection, communications, and even phasor measurement unit (PMU) capabilities have been added. These are game-changing developments for utilities. Grid conditions can now be monitored and managed in near real time all the way out to distribution substations, where, in many cases, mechanical protective relays with no communications had typically been used. The first generations of protective relays are reaching the end of their useful lives and are being replaced with the next generation of ADVPR solutions. Navigant Research expects these systematic replacement cycles to provide a growing revenue stream for vendors over the next decade. According to Navigant Research, global protective relay revenue is projected to grow from $5.5 billion in 2015 to $9.7 billion in 2024. This Navigant Research report analyzes the global market for ADVPRs, with a focus on four classes of technologies: mechanical, solid-state, and digital protective relays and integrated digital protection systems. The study provides an analysis of the market issues, including market drivers and barriers, as well as regional trends and opportunities, associated with digital protective relay technologies. Global market forecasts for revenue, segmented by ADVPR technology and region, extend through 2024. The report also examines the key technologies related to digital protective relays, as well as the competitive landscape.