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Analysis and Investigation of the Main Causes in Overheating the Frontal Areas of Stators at Vertical Hydro-generators

机译：立式水轮发电机定子前部过热的主要原因分析与研究

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Many Romanian hydroelectric power plants commissioned during 1970-1990 are nowadays confronted with overheating in front of the turbines’ stator. For determining the main causes responsible of overheating during the functioning, the flowing rate, temperature, and the installed power were measured. These parameters were correlated with the water level from lake and the characteristics of the hydraulic machines. Ten of all tested turbines have a pronounced overheating in both modes of operation, inductive and capacitive. In these conditions, the turbine can not attend the secondary voltage control, neither at the power-frequency control. In the present paper from all the tested turbines confronted with the same problem, three turbines were selected. The obtained results for some aerodynamic and hydrodynamic parameters considered the main cause of improper functioning are analyzed. A new and unconventional solution for accomplishing the measurements was tested. The realized mathematical model establishes the necessary ventilation and the hydrodynamic parameters during the functioning. The obtained results were used as input data for the numerical model. The water level from the lake influences the proper functioning of the hydro-generators. The developed mathematical model enables the determination of the overheating causality. Some new solutions and constructive modifications are proposed, for improving the turbines operation. Finally, some conclusions and references are presented.
机译：如今，在1970-1990年间投入运行的许多罗马尼亚水力发电厂在涡轮机定子前都面临过热的问题。为了确定在运行过程中造成过热的主要原因，对流量，温度和装机功率进行了测量。这些参数与湖泊水位和水力机械的特性相关。在经过测试的所有涡轮机中，有十种在电感和电容两种工作模式下均存在明显的过热现象。在这些情况下，涡轮既不能进行二次电压控制，也不能进行工频控制。在本文中，从所有测试过的涡轮机面临相同的问题，选择了三个涡轮机。分析了一些空气动力学和流体动力学参数的获得结果，这些参数被认为是功能失常的主要原因。测试了用于完成测量的新的非常规解决方案。所建立的数学模型建立了运行过程中必要的通风和流体力学参数。获得的结果用作数值模型的输入数据。湖泊中的水位影响水轮发电机的正常运行。开发的数学模型可以确定过热的因果关系。提出了一些新的解决方案和建设性的修改，以改善涡轮机的运行。最后，给出了一些结论和参考。

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