Simulating the mode of one-sided switching-on of an ultra-high voltage power line using a device for synchronizing the moments of switching-on the contacts of the circuit breaker phases

Abstract

Simulating the switching on of an overhead power transmission line (PTL) of ultra-high voltage in a dead-end mode, containing a significant aperiodic current component, both from the switch control key and in the three-phase automatic reclosing (TARC) cycle, is performed using the MATLAB software package. The aim of modelling is to search and find the optimal modes of electrical transmission operation in terms of admitting the values of the aperiodic current component and assessing possible values of overvoltages in the phases of power transmission lines. The possibility of using phase-by-phase control of a high-voltage circuit breaker, which ensures closing the power contacts of the circuit breaker phase at the moment of the maximum value of the instantaneous voltage on these contacts, is checked as a measure that can significantly reduce the influence of the aperiodic current component on the possibility of damaging switching equipment and developing an emergency situation in the power system. The results obtained can be used to practically eliminate the influence of the aperiodic current component in all possible modes (dead-end mode of an overhead line (OL), in an unsuccessful automatic reclosing cycle (ARC) for all types of short circuits on a high-voltage power line) with shunt reactors put into operation and without putting them into operation.