Ground fault protection relay device for the detection of ground fault current direction and gender dynamic ground fault protection relay system for DC traction supply system of non-ground

摘要

To operate the present invention relates ground fault protective relay system, it is necessary to flow a ground fault current in a large amount in the event of a ground fault, the resistance of the grounding resistor placed between the cathode mains rectifier result ground It is difficult to select a value. A1 The present invention relates to a ground fault protection relay apparatus for an electric railway. In ground fault protection relay device for detecting a ground fault current for operating the ground fault protection relay device according to the DC traction supply system ungrounded cathode mains rectifier is connected to ground through the current limiter and the resistor. While shows a resistance characteristic high during normal operation and limits to the reference value or less leakage, shows a low resistance characteristic at the occurrence time of ground fault current limiting device is in an amount sufficient to detect a ground fault and allows the flow of ground fault current. [Selection Figure Figure 2