admin 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 CB closing, the SOTF protection will activate and it will trip the Circuit Breaker immediately to isolate the fault. Why SOTF Protection? We know that … Read more
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 auto recloser relay is also available for using the function. Auto Recloser Relay Function: We know that the distance protection relay is used to protect … Read more
Stub protection uses a simple overcurrent protection system to protect the transmission line when the line isolator remains open. Stub protection works mainly in a one-and-a-half breaker busbar scheme. In this scheme, two lines connect to two buses through three circuit breakers, as shown in the diagram. When one line shuts down or switches off, … Read more