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Siemens Energy Presents New Control System for Industrial Steam Turbines

Posted on December 22, 2009

The TURLOOP control system, with global sales of more than 400 systems to date, provides Siemens Energy Service with a successful automation system for industrial steam turbine applications. To supplement this, TURLOOP CS was developed as a compact, budget variant. The system platform is based on Simatic S7 standard components, allowing flexible use for industrial steam turbines including extraction turbines with up to two extractions and irrespective of whether these are used as generator, compressor or pump drives.

Additional features of TURLOOP CS include provision for up to five configurable process controls and a maximum of eight final control elements with position controllers. The new control system also implements limit controllers for generator load, inlet pressure and backpressure, as well for extraction and wheel chamber pressure. Linearization curves can be parameterized for all final control elements. The system also permits automatic startup of the turbine and runup to nominal speed, while distinguishing between cold, warm and hot starts.

The system features on-board two-channel speed measurement for eddy-current sensors. TURLOOP SMM-DP speed measurement allows connection of all standard eddy-current sensors and proximitors, as well as interfacing with electronic overspeed protection systems via an adapter module. Where eddy current sensors are used, continuous monitoring of gap between speed sensor and pulse wheel is possible. Speed actual values are transmitted to the central computing unit fast and error-free along a PROFIBUS link.

Parameterization menus are used to adapt the system to the turbine via a 12-inch touchscreen, this also permitting comfortable system operation during turbine operation. Customer designations and tags from standard identification systems can be stored and displayed in the system. No additional software or hardware is required here for parameterization. Use of standardized and tested hardware and software ensures operating safety and reliability. Parameterization errors are detected, thus preventing "impossible" configurations. Self-diagnostic features are integrated in the control system. Provision is also made for backup of configuration data to a USB drive.

For more information: www.siemens.com

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