The growing demand for higher power generation brings the request for increased reliability and efficiency of turbines. The last stage blades in the low-pressure steam turbine parts (LP) are, from this point of view, a key element of the turbine design defining the overall power, dimensions and design of the machine. Therefore, longer and bigger blades are designed.¹ However, these large blades are concurrently subject to strong dynamic loads. Therefore, crack detection and inspection is regularly performed during turbine overhauls. However, each outage and opening of the low-pressure part is associated with increased costs, often with an extension of the planned shutdown harmonogram and operators logically try to avoid it. The systems installed for the purpose of long-term monitoring of the rotating blades during operation can assist in deciding whether a blade inspection is necessary. These systems allow to monitor the vibratory behavior of the blades during turbine operation and to detect operation with blade excessive strain.

中文翻译：

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使用标准涡轮仪表监测旋转叶片

对更高功率的需求的不断增长提出了提高涡轮机可靠性和效率的要求。从这个角度来看，低压蒸汽涡轮机零件（LP）的最后一级叶片是涡轮机设计的关键元素，它定义了机器的整体功率，尺寸和设计。因此，设计了更长，更大的叶片。^1个然而，这些大叶片同时受到强大的动态载荷。因此，在涡轮机大修期间定期进行裂纹检测和检查。但是，低压部分的每次停机和打开都会增加成本，通常还会扩展计划中的停机谐波图，因此操作人员在逻辑上会设法避免这种情况。为在运行期间长期监控旋转刀片而安装的系统可以帮助确定是否需要检查刀片。这些系统允许在涡轮机运行期间监视叶片的振动行为，并检测叶片过度应变时的运行情况。