ABSTRACT
In industry where reliability is important issue condition monitoring systems are often used as means of controlling machinery current state, store history of usage conditions as well as prediction of system future failures. Data gathered by condition monitoring systems is often used in failure diagnosis and scheduling maintenance in order to minimize system down-time. Basically system consists of certain number of sensors which are producing raw measurement data and software which processes and stores data from sensors. Sensors measure power current, temperature, vibrations and some other measurable features of machinery. Since in many cases it is impossible to take any decision or verify current system state basing on such simple indications from sensors data must be processed to the form which is easier to interpret. In many systems calculation like FFT of vibration and power current are often used for monitoring purposes. More developed methods are used for decision making and failure prediction. In condition monitored systems where electrical devices such as engines, gearboxes, transformers vulnerable to power disturbances are present methods of power quality analysis come into use.
