Power Plant Sequential Trip Logic Explained

In this overview, we explore power plant sequential trip logic, focusing on a setup where the generator field breaker stays closed until a reverse power permissive is detected. This controlled shutdown process protects turbine-generator systems by ensuring the prime mover, like a steam or gas turbine, has stopped driving the generator before de-excitation. Reverse power—when the generator draws energy from the grid instead of producing it—acts as the key signal, confirmed by a relay after the turbine slows down. The sequence begins with a triggering event, like a steam loss, followed by…