Taleb A. Open-phase modes of operations of asynchronous motors of power station auxiliaries

Power supply system of electric power station aux-iliaries. Rising reliability of station auxiliaries asynchronous motor at the open-phase regimes due to perfection of the relay protection devices; Researching methods are analysis of stationary and transitional modes of operation of asynchronous motor at the open-phase regimes and theory of relay protection of station auxiliaries system elements. Worked up: 1) the deter-mination methods of equivalent circuits parameters of asynchronous motor for analysis of open-phase regimes based on the catalogue data; 2) mathematical model of multimachine power supply system of station auxiliaries for analysing the open-phase regimes, 3) computation method of losses and windings heating tempera-ture of asynchronous motor at the open-phase regimes; 4) is offered a new device of asynchronous motor relay protection from phase break in feeding net and in motor stator windings circuit. In the result of research an apparatus realization and software of power station aux iliary system and of it separate elements is got. The sphere of using is the power supply systems with asynchronous load.