MV protective relay

MV protective relay used in medium voltage networks which is activated when the electrical quantity changed such as voltage and current or physical quantity like thermal degree and oil move and it leads to start other devices and at last break the circuit. These relays which include Control relays and Multi Function Protection Relays, are offered in different models such as feeder protection , motor and transformer protection , differential and distance protection , overcurrent and overload protection , Station Controller، Bay Controller , Synchro-check , frequency load shedding , automatic voltage regulator and alarm unit . MV protective relay are used to control of power equipment in a power plant , post , refineries , etc.