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WOODWARD TURBINE OVERSPEED PROTECTION DEVICE PROTECH GII

Woodward PLC is leader in manufacturing Turbine Control System & over speed protection system. Protech GII is control device to protect turbine from overspeeding & thereby inclining towards breakdown or failure.
Protech GII safely shuts down steam, gas & hydro turbines upon sensing over speed or over acceleration event. It accurately monitors turbine rotor speed & acceleration via MPUs (Magnetic Pick Up) coils & issues shutdown command to turbine trip valves or installed trip system.
8237-1596
above is the picture of Woodward Protech GII overspeed protection device, which works on TMR (Tripple Modular Redundancy) concept. Normally DCS has redundant(double) modules specially of Power & Control Processors to avoid tripping of plant because of failure of one module. TMR concept is patented by Triconex plcs(Emergency Shutdown System, Instrumented Protective System, Fire & Gas System, Burner Management System) which is taken over by Schneider.  

Function : 

Interface to digital control and protection - Veinfurt
As you can see in the above picture, how Protech GII gets input speed signals via 3 magnetic pickup units(speed sensors) sending correct speed of steam turbine, based on the input signal if the turbine reaches overspeed limit, Protech GII gives output to Trip Block assembly which eventually closes Trip valve & stops further steam input to the turbine.

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