FIELD: electric engineering.
SUBSTANCE: projection of total resistance onto axis is calculated, which projection is turned in complex plane of resistances for estimated angle relatively axis of coordinates. Projection of measured voltage to axis is calculated, which is turned in complex plane relatively current vector for the same estimated angle. First and second time derivatives are calculated from projection of voltage vector. Moment, when asynchronous mode origins, is registered on base of non-coincidence of sign of voltage vector with signs of its first and corrected second derivatives. Starting from that moment, time is measured and half-period of asynchronous mode is calculated through first derivative of projection of voltage vector. In case measured time exceeds time of half-period of async mode, reduced by preset value, availability of async mode is fixed to form effect of automatics for liquidation of the mode at favorable value of angle of electricity transmission.
EFFECT: reduced number of incorrect influence of automatics; higher selectivity; higher stability of operation; improved adaptability.
6 dwg
