Turbine Supervisory Instrumentation (TSI) in Turbine Monitoring

Turbine Supervisory Instrumentation (TSI) is a critical system that monitors key parameters of a turbine to ensure its health and reliability. The TSI system includes measurements for rotor train behavior, such as speed, vibrations, axial position, and differential expansion of the turbo set.

Key Parameters Monitored by TSI

• Vibration: Vibration measurements encompass both shaft and bearing vibrations, crucial indicators of turbine health.
• Turbine Expansion: Monitoring absolute and differential expansion helps prevent rubbing between rotating and stationary parts.
• Axial Shift: Supervising axial shaft position safeguards against excessive thrust rates during transient conditions.
• Speed Measurement: Speed data is crucial for ensuring the turbine operates within safe limits.
• Key Phasor: Key phasor signals assist in measuring vector parameters like 1X amplitude and phase.

Bently Nevada 3500 System

The Bently Nevada 3500 rack is a trusted system for processing vibration, axial position, and differential expansion data. It communicates with the turbine control system via Modbus TCP/IP, ensuring seamless integration.

Bently Nevada 3500 Rack Components

• 3500/15 Dual-Redundant Power Supply: Provides primary and backup power sources for the system.
• 3500/22 Transient Data Interface (TDI): Interfaces with monitoring software and collects dynamic data.
• 3500/25 Key Phasor: Converts input signals from proximity probes into digital key phasor signals.
• 3500/42M Proximitor / Seismic Monitor: Monitors proximity and seismic signals, generating vibration and position measurements.
• 3500/45 Position Monitor: Accepts inputs from proximity and position transducers, conditioning proportional values.
• 3500/32M 4 Channel Relay: Provides hardwire relay outputs with configurable logic for alarms and dangers.
• 3500/92 Communication Gateway: Facilitates digital communication with the turbine control system.

Dual Over-speed Racks for Turbine Speed Supervision

JAQUET FT3100 racks ensure rotor train speed remains within safe limits. They come with redundant sensing elements to guarantee reliability.

Monitoring Turbine Field Instruments and Transducers

Various instruments and transducers are employed to monitor critical aspects of the turbine:

• Shaft Position: Supervising axial shaft position protects against shaft displacements during transient conditions.
• Differential Expansion: Ensuring differential expansion is within limits prevents rubbing between parts.
• Gap Voltage (VDC): Represents the distance between the probe’s tip and the shaft’s surface.

Conclusion

Turbine Supervisory Instrumentation, like the Bently Nevada 3500 system and JAQUET FT3100 racks, plays a vital role in maintaining turbine health and reliability. Monitoring these parameters ensures safe and efficient turbine operation.