The ProTech-GII is a configurable overspeed detection system designed to safely shut down steam, gas, and hydro turbines of all sizes upon sensing an overspeed or overacceleration event. Available in two dual redundant trip relay outputs using a 2-out-of-3 voted architecture, or with three independent non-voted trip relay outputs with individual alarm relays, 4–20 mA speed readouts, and Modbus® communications making this overspeed device easy to integrate into any turbine safety system. This ProTech GII model is a panel mount, high voltage/low voltage power input, voted relays/voted inputs safety device for steam turbine overspeed protection.
Optionally the ProTech-GII can be configured to protect a turbine from high acceleration events also. The derivative of the speed signal is used to detect turbine acceleration and issue an associated trip command.
Each module’s speed sensor input uses special MPU open-wire detection circuitry to validate that the MPU is properly connected before turbine operation, and special loss-of-speed detection logic to validate MPU functionality during turbine operation.
Automatic Overspeed Test Routine
Optionally the ProTech-GII can be configured to routinely perform an overspeed test of each module, then log and report the test results. With this test routine, each module goes through its test sequence using an internal frequency generator to simulate an overspeed condition.
Sulfur Contamination Resistant
The ProTech-GII utilizes a special conformal coating material that has demonstrated excellent long-term protection against H2S and SO2 gases at levels classified in international standard IEC 721-3-3 1994 - environment Class 3C2.
The ProTech-GII’s triple-modular design allows users to easily replace one of its modules (A, B, C) while the turbine is on-line and operating normally. Ease of replacement is enhanced by the unit’s backplane plug-and-operate structure, and its module-to-module learning function.
PROTECTING YOUR ASSETS--SAFETY SYSTEMS FOR TURBINES AND COMPRESSORS