Specialty protection modules provide monitoring solutions for speed, overspeed, acceleration, reverse rotation, locked rotor, thrust, case expansion, differential expansion, common process measurements and differential measurements, and temperature and differential temperature. These solutions are typically applied in the monitoring of steam and hydro turbines, aeroderivative and industrial gas turbines, turbo-expanders, large pumps, and compressors. All specialty protection modules communicate via DeviceNet™ network.
Dual speed modules measure speed, rotor acceleration, and peak speed and can detect zero speed, locked rotor, and reverse rotation. In addition, these modules are components of Electronic Overspeed Detection Systems (EODS).
Eccentricity is the measure of the amount of bow in a rotor. Rotor bow can be a fixed mechanical bow, or it can be a temporary bow caused by uneven thermal heating or simply by the weight of the rotor (gravity bow). Knowing and managing the amount of rotor bow is critical to the startup of most steam turbines.
Our modules perform real-time measurements of dynamic signals within a frequency band centered on the running speed of a machine, any multiple of running speed, or within any specific frequency range. True real-time measurements are often required as part of the monitoring solution for many classes of industrial and aeroderivative gas turbines, such as the Rolls Royce® Trent® engine and the General Electric® LM2500™ engine.
Position modules provide static turbine supervisory position measurements, including axial position (thrust), valve position, differential expansion, and case expansion.
Process modules measure DC voltage or loop current and report and alarm on the data value, the rate of change for each channel, and the difference between adjacent channels.
Relay modules provide additional relay capabilities to our XM® series of intelligent I/O modules.
Temperature modules measure either Resistance Temperature Detectors (RTDs) or grounded or isolated thermocouples. These modules report and/or alarm on the measured temperature, the rate of change for each channel, and the difference between adjacent channels.
Shaft absolute is the measure of the shaft’s motion relative to free space. Our modules calculate the absolute shaft measurement by summing the signals of both an eddy current probe (measuring the motion of the shaft relative to the case) and a seismic or velocity sensor measuring the absolute motion of the case. Monitoring absolute shaft vibration is critical for many large steam turbines where the weight of the shaft is large relative to the weight of the turbine case.