Mobile Power Measuring Complex a Three-Phase Motor with Separation Low-Frequency Vibration Components

Abstract

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Electric drive elements are a common network load in power supply systems. Inaccuracies in the electric machine installation and changes in the load, lead to constant changes in power consumption, including in the vibration event. Vibration forces have a negative effect on the machine mechanical fastenings and the mechanism. Vibration control is usually provided by specialized portable equipment. As a result vibrations there are deviations in electric power which occupy one of key places. Therefore, to monitor the processes in the induction motor, it is necessary to monitor the electric machine power. To obtain the necessary information on changes in power, developed a device for collecting electrical signals of the power circuit and a program for data processing. The device is designed for data collection both in places with access to power from the network, and in places with the appropriate voltage, for direct connection to the network. The program is based on wavelet transform of instantaneous three phases power, which allows you to convert a signal from the time domain to the frequency time. From the total power observation in the frequency-time domain, two frequency bands with constant expressed signals were obtained. In addition, due to a experiments series, a constant decrease in the amplitude power fluctuations with a frequency lower than the mains voltage frequency was determined.