Restricted Earth Fault Protection(REF) in Transformer
REF relay stands for Restricted Earth Fault Protection. It is an earth fault protection, and it will cover the protection for a particular area or zone. Generally, it is used […]
Carrier Aided Protection of Transmission Lines
As the name describes, carrier aided protection operates when the power line carrier is received in the relay and after checking the other fault condition in a transmission line. In […]
What is LBB protection? Working, Purpose, Scheme
LBB stands for Local Breaker backup, and it is used as backup protection of the circuit breaker to isolate the fault in case the circuit breaker is failed to trip. […]
What is SOTF protection? Operation and Purpose to use
SOTF protection stands for Switch On To Fault. If any fault is persisting in the transmission line during energization of Circuit Breaker or fault happens within 20 ms from the […]
Auto Recloser Relay – Function, Block & Lockout mode
Auto recloser function is used for transmission line protection system to avoid tripping during transient fault of the line. The function is available in the distance protection relay however separate […]
What is STUB Protection? application and working principle
STUB Protection is simple overcurrent protection it is used to protect the power system transmission line when the line isolator is in open condition. STUB protection is mainly required in […]