scope:

This part of IEC 60255 is applicable to measuring relays and protection equipment, taking into account combinations of devices to form schemes for power system protection including the control, monitoring, communication and process interface equipment used with those systems. This standard specifies the requirements for electromagnetic compatibility for measuring relays and protection equipment. For equipment not incorporating electronic circuits, for example electromechanical relays, tests according to this standard are not required. The requirements specified in this standard are applicable to measuring relays and protection equipment in a new condition and all tests specified are type tests only. 151 1.1