Differential protection of three and four parallel lines of idling current control

摘要

Algorithms of operation of three or four parallel lines protections, based on the difference between the control currents in the corresponding phases and current in comparison with their idling current are proposed. The implementing of protections of three parallel lines on logic elements is given. The work is considered in different modes. It is shown that when the three lines of action of cascade zone do not exceed the line length of 0.08, while the four- 0.06.%Opisano algorytm umożliwiający zabezpieczenie linii trzy- lub czteroprzewodowej bazujący na analizie różnic między prądami oraz różnicy prądów jałowych.