System and device for over-speed protection of a turbo-machine
This disclosure describes embodiments of a system and device to prevent damage that can occur during an over-speed condition in a turbo-machine. The embodiment includes a fluid circuit with a header, which couples to the turbo-machine, and a hydraulic circuit through which fluid can evacuate the header to a drain. The hydraulic circuit includes a trip header manifold with a pilot element in flow connection with a drain valve element that has an actuator to regulate the flow of fluid from the header. In one example, the pilot element uses solenoid valves to change the pressure of a fluid in the drain valve element and, in particular, maintains the actuator in a first position to prevent fluid to evacuate during normal operating conditions at the turbo-machine. When the over-speed condition occurs the actuator moves to a second position to place the header in flow connection with the drain.
1. A protection system for over-speed protection in a turbo-machine, said system comprising:
a fluid circuit comprising a header, a drain, and a hydraulic circuit coupling the header to the drain, the hydraulic circuit comprising a trip manifold device with a first state that prevents fluid to flow from a first inlet/outlet of the trip manifold device to a second inlet/outlet of the trip manifold device and a second state that permits fluid to flow from the first inlet outlet to the second inlet/outlet,
wherein the second state places the header in flow connection with the drain to permit fluid in the header to flow to the drain, and
wherein the hydraulic circuit comprises a first hydraulic circuit and a second hydraulic circuit that couple with the header to separate drains.
2. The system of claim 1 , wherein the hydraulic circuit directs a supply fluid to the trip manifold device as a pilot supply and a main supply, and wherein the pilot supply pressurizes an actuator in the trip manifold device to maintain the trip manifold device in the first state.
3. The system of claim 2 , further comprising one or more valves disposed in hydraulic circuit between the header and the trip manifold device.
4. The system of claim 1 , further comprising a junction box coupled with the trip manifold device, wherein the junction box provides an interface between turbo-machine controls and elements in the trip manifold device to change the trip manifold device between the first state to the second state.
5. The system of claim 4 , wherein the elements comprise a pair of solenoid valves.