Vasylets S. Mathematical modelling of transients at multiple engine electrotechnical complexes of mines.

Object - transients at multiple engine electrotechnical complexes of mines. The purpose - analysis of transients at multiple engine electrotechnical complexes of mines, which took place after safety tripping in case of leakage current flows, using methods of mathematical modelling, taking into account arrangement and functioning of power-supply net of technological mine section. Methods - theoretical (theory of alternating current electrical machines, transients theory, space vector method) and experimental (measuring of transient parameters in laboratory and industrial conditions, under voltage of 380 V and 1140 V accordingly, using modern methods of electrical measurements; processing was carried out by means of probability theory methods and the mathematical statistics). Novelty consists in further development of mathematical model of multiple engine electrotechnical complex of mine, that differs in taking into account stochastic reconfiguration of power net and in allowing to determine an influence of induction motors upon the character of voltage decreasing on individual branches of the power net after circuit breaker tripping. Results - the task of transient analysis in multiple engine electrotechnical complexes of mines, which took place after safety tripping in case of leakage current flows, using methods of mathematical modelling, taking into account arrangement and functioning of power-supply net of technological mine section, was solved. Industry is coal mines of Ukraine.