BUS DIFFERENTIAL PROTECTIVE RELAYING SYSTEM IN UNGROUNDED DC TRACTION POWER SUPPLY SYSTEM AND CONTROL METHOD THEREOF

摘要

The present invention is installed in each substation to supply DC power to the train in the electric railway power supply system ground If the ground is the mother ship of the protection relay or short-circuit system with an accident protection accident by using a differential busbar differential protection relays on the relay system and a control method that allows you to protect the mother ship. ; The present invention is to realize this, for installing the rectifier circuit breaker bus between the rectifier (positive bus) to the output side of the rectifier and each substation feeder for supplying a direct current power source, and between the negative bus and the ground, and the ground resistor during normal operation exhibits a high resistance to limit the leakage current to the reference value characteristic and below the protective relay system in the hayeoseo connecting the current limiting means to flow a magnitude of ground current exhibits a low-resistance characteristics required for detecting ground fault accident in series with an ungrounded DC power supply system In, busbar that is made if the sum bus accident judgment reference value set in advance or more, as judged by bus accident associated with the rectifier circuit breaker to trip all the bus to isolate the bus from the system by measuring the current accident of all the branches connected to the rectifier bus The invention of the structure being installed add-fault protection.