Explain one and half breaker scheme

Question

Accepted Answer

One and a half breaker scheme is a protection scheme used in power systems to provide selective tripping of faulty sections.

It involves using one full circuit breaker and one half circuit breaker to protect a section of the power system.
The full circuit breaker is used to protect the main section while the half circuit breaker is used to protect the adjacent section.
If a fault occurs in the adjacent section, the half circuit breaker trips and isolates the faulty section while the full circuit breaker remains closed to maintain power supply to the main section.
If a fault occurs in the main section, both the full and half circuit breakers trip to isolate the faulty section.
This scheme provides selective tripping and minimizes the impact of faults on the power system.
It is commonly used in high voltage transmission systems.

Top TP Central Odisha Distribution Graduate Engineer Trainee (Get) interview questions & answers