Protection Switchgear 8 min read
Formation of arc during circuit breaking
The phenomena of Arc During opening of current carrying contacts in a circuit breaker the medium in between opening contacts…
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Protection Switchgear 2 min read
Protection of bus bars
The protection scheme for a power system should cover the whole system against all probable types of faults. Unrestricted forms…
Protection Switchgear 5 min read
Generator protection
· The range of size of generators extends from a few hundred KVA to more than 500MVA · Small and Medium sized…
Protection Switchgear 3 min read
Under Frequency | Negative Sequence Relay
Under Frequency Relay Frequency based relays can either be under frequency relay or over frequency relay. The frequency relays are normally used in generator protection and…
Protection Switchgear 1 min read
Static relays
Advantages of static relays • Due to the amplification of energizing signals obtainable, the sources need only provide low power. Therefore…
Protection Switchgear 1 min read
Distance relay
Distance relay is used for the protection of transmission line & feeders In a distance relay, instead of comparing the…
Protection Switchgear 1 min read
Directional Over Current Relays
1. When fault current can flow in both the directions through the relay, at its location. Therefore, it is necessary to…
Protection Switchgear 7 min read
Definition of Torque
Torque is defined as the moment of the external applied force about a point or axis of rotation. The expression…
Protection Switchgear 1 min read
Impedance Relay
The torque equation T, for such a relay the current actuates the operating torque and the voltage actuates the restraining…
Protection Switchgear 15 min read
Electromagnetic Relay
Electromagnetic relays are those relays which are operated by electromagnetic action. Modern electrical protection relays are mainly micro processor based,…
Protection Switchgear 2 min read
Zones and types of Protection system
Zones of Protection system · An electric power system is divided into several zones of protection. Each zone of protection, contains…
Protection Switchgear 8 min read
NATURE &EFFECT OF TRANSFRMER FAULTS
A faults on transformer winding is controlled in magnitude by a) Source & neutral earthing impedance b) Leakage reactance of the transformer…