Under Frequency Relay Frequency based relays can either be under frequency relay or over frequency relay. The frequency…

Advantages of static relays  •  Due to the amplification of energizing signals obtainable, the sources need…

 Distance relay is used for the protection of transmission line & feeders In a distance…

 1.                          When fault current can flow in both the directions through the relay, at its location.…

Torque is defined as the moment of the external applied force about a point or…

The torque equation T, for such a relay the current actuates the operating torque and…

Electromagnetic relays are those relays which are operated by electromagnetic action. Modern electrical protection relays…

 Zones of Protection system ·         An electric power system is divided into several zones of protection.…

 A faults on transformer winding is controlled in magnitude by  a)                         Source & neutral earthing impedance…

 •                          The power transformer is one of the most important links in a power transmission and…