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Gas turbine measurement algorithms takes Sentry G3 machinery protection to a new level

11 July 2018

Sensonics introduced new measurement algorithm options for its Sentry G3 machinery protection monitor, the high performance turbine supervisory system.

The latest Sentry G3 system not only provides machine protection to the  API670 standard it also offers a range of programmable algorithms in each module to enable plant engineers to rapidly identify abnormal conditions and better manage the dynamic behaviour of their rotating plant. 

The Sentry G3 concept is one module type for all measurements; maximising flexibility, minimising spares holdings and already has many site references for the standard set of turbine supervisory measurements, including shaft eccentricity, rotor differential expansion and case expansion. These measurement algorithms can be loaded and configured in any channel position to provide the required measurement regime. 

The recent focus has been to provide gas turbine specific measurements such as first order vibration tracking and dynamic pressure which are both requirements recommended by gas turbine manufacturers. In addition, the speed algorithm has also been optimised to accept a wider range of speed probes and now offers a market leading sensitivity performance over a wide speed range ensuring the turbine interlocks can be integrated effectively to the G3 system over a range of operational conditions.

The new measurement algorithms can be downloaded in to the common hardware module and complement the other established measurements such as broadband vibration, temperature and speed which are also required for these types of applications. The flexibility of the G3 system sensor interface also permits a wide range of sensor types to be utilised providing both the necessary drive power supplies and fault detection.

The G3 system offers efficient channel density with up to 24 measurement channels in a 3U x 19” racking format, while the diverse system architecture separates functions across the independent modules providing a channel reliability suitable for safety instrumented systems. 

In summary, Sentry G3 provides state-of-the-art protection for the following modes:
 
• Measurement - Absolute bearing and relative shaft vibration, displacement and thrust position, speed, phase and reverse rotation, differential and casing expansion, rod drop and temperature. 
• Turbine Specialist Measurement - Shaft eccentricity, order tracking, dynamic pressure and mark - space differential expansion. 

The additional features incorporated into the latest Sentry G3 system ensures more than just machine protection, providing a set of tools to assist plant engineers to optimise the control and management of their rotating plant. 


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