Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
MULTIPARAMETER MONITORING OF THE SPEED ADJUSTMENT SYSTEM OF A 390 MW FRANCIS TURBINE
Submission Author:
ANGELO MADUREIRA , PA , Brazil
Co-Authors:
ANGELO MADUREIRA, Edileno Miranda Cordovil
Presenter: ANGELO MADUREIRA
doi://10.26678/ABCM.COBEM2019.COB2019-2066
Abstract
Hydrogenerators are machines of great importance in the generation of electric energy, especially in the context of the Brazilian energy matrix, where hydroelectricity accounts for more than 65% of energy generation. There is an increasing need to monitor the entire generation system, due to the increase over the years, by the regulator of electric power availability index. Thus, this work will present a case study of monitoring of 390 MW Francis turbines by means of real time data acquisition of structural and dynamic components of the speed regulation system, the main control system of hydraulic turbines.This work has arisen due to the high number of shear pin failures of the speed governor distributor mechanism, object of this study, which causes losses in the availability of these hydrogenerator units. Therefore, monitoring based on measurements of microdeformations using sensors of the strain gages type was used in the distributor mechanism. After the tests, excessive deformation of the adjustment ring and turbine cap can be achieved, causing excessive torque and spurious loads on the drive cranks of the guide vanes. The implemented solution aimed to reduce the coefficient of friction of the bearings to levels lower than those considered in design so as to avoid the overload of torque in the drive. The multi-parameter monitoring system adopted for the diagnosis proved effective and a suitable tool for complex diagnoses in large hydraulic machines.
Keywords
Francis Turbine, sensores straingages, failure analysis, Online monitoring systems
