IEC 60255-1:2022 specifies common rules and requirements applicable to measuring relays and protection equipment, including any combination of equipment to form a distributed protection scheme for power system protection such as control, monitoring and process interface equipment . IEC 60255-1:2022 specifies common rules and requirements applicable to measuring relays and protection equipment, including any combination of equipment to form a distributed protection scheme for power system protection such as control, monitoring and process interface equipment . Concepts and applications of ac transmission line protection are presented in this guide. Many important issues, such as coordination of settings, operating times, characteristics of relays, mutual coupling of lines, and use of communication channels, are examined. These types of devices protect electrical systems and components from damage when an unwanted event occurs, such as an electrical. This handbook covers the code of practice in protection circuitry including standard lead and device numbers, mode of connections at terminal strips, colour codes in multicore cables, dos and donts in execution. The device numbers are enumerated in ANSI / IEEE Standard C37. 2 Standard for Electrical Power System Device Function.
