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Siemens offers a variety of solutions to help optimize plant operation. One very powerful tool is the Siemens Power Diagnostics® services that can be applied to either technical function groups of the turbine island or the complete power plant. These services combine our global engineering experience, comprehensive online data acquisition, data processing and analysis, trending, security systems, and the use of an expert knowledge base at remote Power Diagnostics Centers to enable detailed diagnosis of many actual plant conditions and recommendations for improvements.
Our goal is to help you identify, assess and diagnose abnormal operating conditions and determine follow-up actions – basically identify a potential problem before it impacts operations. Using Power Diagnostics services, we can help you turn an unplanned shutdown into a scheduled outage supported by the personnel and materials needed to make the best use of your time and money. Bottom line – in the long run our diagnostics service can help drive optimized operation, higher availability and improved turbine island efficiency.
Power Diagnostics services can provide …
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We are providing these services globally for more than 500 installations for gas turbines and combined cycle units which includes steam turbines and generators. The Power Diagnostics product line comprises
a variety of different diagnostic modules which are offered globally. Our expertise on gas units has been applied to the entire steam plant island.
Siemens Energy offers a variety of specialty monitors to assess your generator equipment condition. These monitors have local displays as well as capability to connect to the Power Diagnostic Center (PDC). With the Siemens specialty monitors following events can be monitored for generators:
Operation and aging can lead to damage to the high-voltage insulation. A continuous increase in partial discharges can be a symptom of pending insulation damage. Radio frequency measurement methods make it possible to identify, localize and monitor such partial discharges at an early stage so that appropriate measures can be planned and initiated to facilitate further operation
The high electromagnetic flux and currents created inside a generator can lead to end-turn basket vibration on some units. Generator end winding vibrations can loosen the winding, weaken insulation and ultimately crack conductors. Monitoring enables the identification of changes within the vibration behavior and the opportunity to take early action in some cases before extensive stator winding damages occurs.
Shorted turns can be caused by failed insulation between individual windings in generator rotor. Current carrying shorted turns will mean that the rotor field ampere turns are reduced and therefore an increase in rotor current will be required to compensate for this. Also, current carrying interturn shorts may cause unbalanced magnetic fields and uneven heating of the rotor which can result in vibration problems. Short circuits can be monitored by installing flux probes which measure flux density changes in the air gap between stator and rotor.
Electrical arcing is often associated with major generator issues. Early identification of arcing can help to proactively detect generator damage.
Grounding the electrical potentials that build up on the shaft can be vital to avoid major damage to bearings and other components. Therefore, the shaft voltage is monitored and an appropriate charge is actively removed in order to maintain the shaft at exactly frame potential. The system is also designed to warn operators of generator bearing insulation failure, arcing at bearings or seals, and when maintenance is required to clean the shaft and brushes.
Siemens Energy offers a variety of specialty monitors to assess your steam turbine equipment condition. These monitors have local displays as well as capability to connect to the Power Diagnostic Center (PDC). With the Siemens specialty monitors following events can be monitored for steam turbines:
Excessive torsional vibrations can result in cumulative fatigue damage, reducing the useful life of the shaft train components and potentially resulting in forced outages. Siemens offers a system to monitor the torsional vibration levels at critical shaft locations of your complete turbine generator shaft line, including contactless torque sensor (magnetostrictive); data processing system (software) and state-of-the-art industrial PC and LC monitor.
A failure of a last stage blade in a steam turbine can lead to severe turbine damage followed by extensive repairs and loss of power production. A blade vibration monitoring system can help early detection of abnormal blade vibration behavior. In conjunction with a diagnostics system, the vibration characteristics can be analyzed in more detail and support the inspection schedule in a timely manner. Depending on the system set-up, synchronous and non-synchronous vibrations can be evaluated.
Successful diagnosis of the generator condition depends on the availability of information; the more information, the more reliable the diagnosis. Learn how our Generator Online Monitoring and Diagnostics portfolio can help to avoid unexpected trips and support condition-based maintenance.