ProTech‐GII

This device accurately monitors turbine rotor speed and acceleration via active or passive MPUs (magnetic sensors) and issues a stop command to the turbine’s trip valves or the corresponding trip system.

Depending on the system design, the ProTech-GII can be purchased with two dual-redundant trip relay outputs using 2-out-of-3 voting architecture, or with three independent non-voted trip relay outputs. Individual alarm relays, 4-20 mA speed displays, and Modbus® communications facilitate its integration into any turbine safety system.

* — Modbus is a trademark of Schneider Automation Inc.

The ProTech-GII is available in flush-mount models for installation inside the front door of a standard 24″ (610 mm) cabinet or in wall-mounted models near the turbine skid. Designed for harsh environments when installed in an enclosure, the device has an IP56 rating (dust-protected and fully protected against strong water jets).

Built for high reliability, each ProTech-GII module (A, B, C) 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 low-voltage input (18-32 Vdc). This design operates on high signal selection, allowing the device to function fully with either or both power sources.

Certified IEC61508 SIL-3
Compliant with API670 and API612 standards
2-out-of-3 voting
High availability (TMR)
Acceleration protection
Online testing
Online repair
Overspeed trip and test logs
Modbus communications
Password protection
12-millisecond response time (independent voting output models)
Internal frequency generator
Optional Ethernet communication gateway