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 […]
VRLA Battery, Working, Types, Maintenance, Application
The Valve Regulated Lead Acid (VRLA) Battery is a type of rechargeable lead-acid battery. It is a fully maintenance-free and complete sealed battery. They are also commonly known as Sealed Battery(SLA). […]
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 […]
RTCC Panel in Transformer and Working Principle
RTCC stands for Remote Tap Changer Control. It is used to control the transformer output voltage by controlling the OLTC unit of the transformer. As we know the OLTC (On […]
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 TNC switch? Working, Function and Application
TNC switch stands for Trip Neutral Close switch. As its name, it is a three-position switch. TNC switch uses to control the Circuit Breaker of the electrical system. The 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 […]