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In utility and industrial electric power transmission and distribution systems, a numerical relay is a computer-based system with software-based protection algorithms for the detection of electrical faults.[1] Such relays are also termed as microprocessor type protective relays. They are functional replacements for electro-mechanical protective relays and may include many protection functions in one unit, as well as providing metering, communication, and self-test functions.
- ^ "Schweitzer Programmable Automation Controller". Schweitzer Engineering Laboratories. Archived from the original on 9 September 2015. Retrieved 21 November 2012.