Posted inProtection Switchgear
Protection of bus bars
The protection scheme for a power system should cover the whole system against all probable…
Posted inProtection Switchgear
Generator protection
· The range of size of generators extends from a few hundred KVA to more than…
Posted inPower System Operation and Control
Current Transformers(CT)s and Potential Transformer(PT)
Current transformers are generally used to measure currents of high magnitude. These transformers step down…
Posted inProtection Switchgear
Under Frequency | Negative Sequence Relay
Under Frequency Relay Frequency based relays can either be under frequency relay or over frequency relay. The frequency…
Posted inProtection Switchgear
Static relays
Advantages of static relays • Due to the amplification of energizing signals obtainable, the sources need…
Posted inProtection Switchgear
Distance relay
Distance relay is used for the protection of transmission line & feeders In a distance…
Posted inProtection Switchgear
Directional Over Current Relays
1. When fault current can flow in both the directions through the relay, at its location.…
Posted inProtection Switchgear
Definition of Torque
Torque is defined as the moment of the external applied force about a point or…
Posted inProtection Switchgear
Impedance Relay
The torque equation T, for such a relay the current actuates the operating torque and…
Posted inProtection Switchgear
Electromagnetic Relay
Electromagnetic relays are those relays which are operated by electromagnetic action. Modern electrical protection relays…