/UploadFile/file/20190805/20190805171058555855.pdf

The ProTech-GII is an
overspeed safety device
designed to safely shut
down steam, gas, and
hydro turbines of all
sizes upon sensing an
overspeed or overacceleration
event. This
device accurately
monitors turbine rotor
speed and acceleration
via active or passive
MPUs (magnetic
pickups) and issues a
shutdown command to the turbine’s trip valve(s) or corresponding trip system.
Depending on the system design, the ProTech-GII can be purchased with two dualredundant
trip relay outputs using a 2-out-of-3 voted architecture, or with three
independent non-voted trip relay outputs. Individual alarm relays, 4–20 mA speed
readouts, and Modbus® * communications make this overspeed device easy to
integrate into any turbine safety system.
*—Modbus is a trademark of Schneider Automation Inc.
The ProTech-GII is available in flush-mount models designed to be installed within a
standard 24” (610 mm) cabinet front door, or models designed to be bulkhead
mounted on a wall or skid near the turbine set. Designed for harsh environments
when installed within an enclosure, this device has an ingress protection rating of
IP56 (protected against dust and completely protected against jets of water of similar
force to heavy seas).
Designed for high reliability, each ProTech-GII module (A, B, C), depending on the
purchased model, accepts two high-voltage power inputs (90–240 Vac / 100–150
Vdc) or one high-voltage power input (90–240 Vac / 100–150 Vdc) and one lowvoltage
power input (18–32 Vdc). This design works on a high-signal-select basis,
allowing the unit to fully operate with either or both power sources available