FIELD: electricity.
SUBSTANCE: invention relates to the field of electric engineering and suggests an adaptive switching method to control overload in result of three-phase reclosure of transmission lines with compensation by shunt reactor. Since an automatic circuit breaker (ACB) cuts the line off interaction between shunt admittance of the transmission lines and inductance of the reactive power compensator makes voltage between the ACB poles taking an oscillation form (beat). An optimal section for ACB reclosure corresponds to the section where voltage beat amplitude between the ACB contacts is minimum. It also allows a bigger time span for ACB operation after detection of the optimal section for reclosure, at that there are still several period of the main frequency ahead. The algorithm of the method is included into the control logic device for a digital relay of the three-phase reclosure of transmission lines thus creating a new digital relay for adaptive three-phase reclosure of transmission lines with compensation by shunt reactor.
EFFECT: high reliability at determining the first section of minimum voltage beat notwithstanding voltage zero crossing.
4 cl, 9 dwg
