This presentation reviews the established principles and the advanced aspects of the selection and application of protective relays in the overall protection system, multifunctional numerical devices application for power distribution and industrial systems, and. This presentation reviews the established principles and the advanced aspects of the selection and application of protective relays in the overall protection system, multifunctional numerical devices application for power distribution and industrial systems, and. Core idea: Protective relays monitor electrical quantities and command protective devices to isolate faults or abnormal operating conditions. Engineering use: Relays are used on feeders, transformers, buses, motors, generators, and transmission lines to protect equipment and improve system. The rectangular devices are test connection blocks, used for testing and isolation of instrument transformer circuits. Also principles of various protective relays and schemes including special protection. Core idea: Transmission line protection detects faults and trips the correct breakers so the faulted line section is removed without unnecessarily de-energizing healthy equipment. Applications range from classic panel built control systems to modern interfaces between control microprocessors and their power circuits or any application where reliable galvanic separation is required between different circuits.
