СИНХРОНИЗАЦИЯ ВЕКТОРОВ ТОКОВ И НАПРЯЖЕНИЙ ПРИ ОПРЕДЕЛЕНИИ МЕСТА ПОВРЕЖДЕНИЯ НА ВОЗДУШНЫХ ЛИНИЯХ ЭЛЕКТРОПЕРЕДАЧИ

Abstract

The article presents and analyzes the method of current and voltage phasors synchronization in the end points of the overhead power line when detecting fault location in order to test the efficiency of the method. Short circuit modes in the overhead transmission line are simulated using the Matlab software. The methods of fault localization in the overhead power line based on measuring the values of emergency condition parameters are applied. An algorithm implementing the proposed method of fault localization by synchronizing current and voltage phasors in the end points of the overhead power line is developed. The algorithm and the method have been tested. A series of short circuits is performed on the simulation model in the different points of the line in order to get the values of current and voltage phasors and use them for the two-end localization of the fault using the proposed method of phasor synchronization. The inaccuracy of the two-end localization of the fault resulting from asynchronized nature of current and voltage phasors reaches the highest values under short circuits in the end points of the line. It is attributable to the highest phase angle between the measured phasors of current and voltage. The maximum inaccuracy of the given model of the overhead power line is 4.5% at the phase angle of 23 degrees. The studies based on the mathematical model of the overhead power line have proved that the use of the introduced method of current and voltage phasor synchronization significantly increases the accuracy of fault localization in the overhead power lines while the error caused by asynchronized measurements is reduced to zero.