Аналіз впливу перекосу електродів ємнісного сенсора биття системи моніторингу стану гідрогенераторів на його функцію перетворення

Abstract

In the paper the impact of the skewness of the surface where the electrodes (sensitive the elements) of the runout capacitive sensor are located on its conversion function is considered. The sensor is designed for the usage in control and diagnostics systems of the actual technical condition of high-power hydro generators. During the assembly runout capacitive sensors may be installed with deviations relatively the normal to the surface, which is controlled, or as a result of technological errors the surface of the sensors may be located under certain angle to the shaft axis, also deviations may occur as a result of vibration or other impacts in the process of operation. It is noted that the response function of the runout capacitive sensor is greatly influenced by the deviation of the planes of electrodes location relatively the axis of the shaft surface. To assess the effect of influence of the skew error on the runout capacitive sensors response function stability, a calculation scheme was used and simulations were conducted in the Comsol Multiphysics environment. The research conducted enabled to obtain response functions for runout capacitive sensors with plane-parallel electrodes at different skewness angles of the surface of the electrodes location. Results of the experimental studies proved the correctness of the analytical propositions and data, obtained as a result of computer simulation The results of the analysis of the obtained response functions enabled to determine that the skewness influences the value of the informative component of the capacitance of the output value of response function of the runout capacitive sensors informative capacity of the output value of runout capacitive sensors and leads to the shift of the graph of the response function on additive component.