Implementation of the line distance protection algorithm in the java programming language
This paper presents an algorithm for distance protection of lines with polygonal and circular characteristics in the Java programming language. The analysis of correct operation for the considered stage of distance protection of the line different types of relay characteristics is made at different types of short circuits. A model of the protected line was developed in PSCAD/EMTD to obtain instantaneous values of currents and voltages during short circuits and a COMTRADE file of the emergency process was formed. Graphs are constructed for a visual representation of the operation of the distance protection of the line. Also these graphs reflect the conditions of operation depending on the choice of the relay characteristics of the resistance relay.