MODEL FOR ANALYSIS STATIONARY COMPONENTS OF SIGNALS FROM CAPACITIVE RUNOUT SHAFT SENSORS FOR LARGE HYDROGENERATORS

Abstract

The stable operation of power equipment is of critical importance for the production, transmission and distribution of electric energy, since the failure of any part of it can lead to serious disturbances in the power system, affecting its reliability and power quality. An important task is the timely monitoring of the technical condition of critical nodes, since internal chemical, thermal and mechanical processes can lead to defects in the design of generators. About half of the breakdowns of generating machines are related to skewing and unbalancing problems. Increased loads on supports and wear of bearings are the consequences of these defects, which impairs the performance of hydraulic units. Vibration control systems mainly use accelerometers, but their effectiveness is limited because they do not allow accurate detection of defects.

The advantages of simultaneous measurement of shaft runout parameters and vibration signals for obtaining more detailed information for diagnosis are presented. Shown that the installation of sensors near the nodes of the hydro unit allows receiving the signals necessary for condition assessment, and the analysis of output signals of capacitive meters ensures high monitoring accuracy, which, in turn, increases the efficiency of managing the technical condition of hydro generators. It was determined that such an analysis is possible when conducting research on computer models, the basis of which are models of measurement signals. Models of the output signal of capacitive shaft runout meters have developed for the analysis of factors contributing to defects in hydro generators.