Mell What is switch on to fault protection?
Switch on to fault protection (SOTF) is used to provide high-speed tripping when energizing a power line under fault condition. Exactly, switching on the circuit breaker without fault clearance (fault exist in the line). Switch on to fault protection trips the circuit breaker immediately without time delay.
What is a close in fault?
… in Figure 1, a close-in fault (or near end fault) is a fault that occurs close to the relay and a far-bus fault (or far end fault) is a fault that occurs at the other end of the line.
What is LBB relay?
Local Breaker Backup Protection is used to protect the generator when the generator’s circuit breaker failed to trip the generator during the fault condition. It is a backup protection of a generator.
What is stub bus protection?
Stub protection is nothing but a simple Phase over current protection which is used to protect the power system under ring bus or one and half bus configuration when the line isolators are opened.
What is auto recloser circuit breaker?
In electric power distribution, automatic circuit reclosers (ACRs) are a class of switchgear which is designed for use on overhead electricity distribution networks to detect and interrupt momentary faults.
What is power swing?
Power swings refer to oscillation in active and reactive power flows on a transmission line consequent to a large disturbance like a fault. The oscillation in the apparent power and bus voltages is seen by the relay as an impedance swing on the R-X plane.
What is a through fault?
Through fault is nothing but a fault which occurs outside of the protective zone or in simple words the external fault is called through fault. Two kind of through fault is considered as through fault. One is External short circuit and another one is overload condition.
What is LBB full form?
LBB (Little Black Book) in Worldwide.
What is teed protection?
INTRODCTION TO TEED CIRCUITS Electrical suuply line protection apparatus used with Teed circuits supply lines having three terminals comprising:a unit at one terminal and the other twoare at each of the other terminals. Broad band communication links between the three units and separate from the supply lines.
What is one and half breaker scheme?
In One and Half Breaker Scheme, three breakers are connected between the two buses. Each Breaker is provided with two Isolators and two Earth Switches. These Isolators are provided to physically isolate the Circuit Breaker for maintenance. One bay of three breakers is called Diagonal in One and Half Breaker Scheme.
When to use switch on to fault protection?
Switch on to fault protection (SOTF) is used to provide high-speed tripping when energizing a power line under fault condition. Exactly, switching on the circuit breaker without fault clearance (fault exist in the line).
When to use switch on to fault relay?
Switch on to fault protection (SOTF) is used to provide high-speed tripping when energizing a power line under fault condition. Exactly, switching on the circuit breaker without fault clearance (fault exist in the line). Switch on to fault protection trips the circuit breaker immediately without time delay.
When to use the SOTF switch on to fault function?
The main purpose of the SOTF switch-on-to- fault function is to provide high-speed trip- ping when energizing a power line on to a short-circuit fault on the line. Automatic initiating of the SOTF function using dead line detection can only be used when the potential transformer is situated on the line-side of the circuit breaker.
When to use SOTF protection on a circuit breaker?
Let us suppose that a fault is existing and we gave a closing command to Breaker, then in that case SOTF protection will immediately trip the Breaker. SOTF Protection is helpful in the sense that while taking maintenance on a Line, it may happen so that Earth Switch of a particular Circuit Breaker is close.