DESIGN AND ANALYSIS OF AUTO SFU OPERATION

Mechanical Engineering

A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by over current or overload or short circuit. Its basic function is to interrupt current flow after protective relays detect a fault. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation. Circuit breakers are made in varying sizes, from small devices that protect an individual household appliance up to large switchgear designed to protect high voltage circuits feeding an entire city. According the manually system, there are too many problems which worker have to face. These problems are as following: • More time consuming. • Required lots of effort. • Chances of damage of machines. • Chances of causes damage on worker when this operation have to do in hazardous area. • Safety of workers is compromised. • This operation has to do in proper time otherwise damage can cause and whole system collapsed. • More man power required. In industry, it works on very high voltage. Once a fault is detected, the circuit breaker contacts must open to interrupt the circuit and then circuit breaker disconnect with the power supply and whole system stop. After the solving the fault, again connect the circuit breaker with the power supply this work has to do manually. This time for reconnect approximately is 5 to 6 sec. After attaching our mechanism with this system this reconnect operation can be done by automatically and it causes less time then manually which approximately is 0.5 to 1 sec. and by this mechanism we also avoid the above problem and get excellent performance.

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