Study On The Technique Of Power Supply System For Railway On The Fault Location Of 10kV Electric Transmission Line

With the rapid development of China’s railways and electrification transformation,the power supply lines under the jurisdiction of the Railway Administration are vast in territory and very complicated along the lines.Among them,10 k V power lines provide power for traffic signal lights,office premises and even related power supply nearby.Railway transportation is related to people ’s livelihood,so the reliability and stability of operation is very important,and the stability and reliability of the corresponding power supply system is also very critical,that is,the power supply system fault detection and removal requirements are very high.Once the power supply line breaks down,it will cause that the traffic signal lights lose power,can not work normally,affect the normal operation of the locomotive,and even cause a large number of property losses and life safety accidents.Therefore,it is very important to patrol the railway power supply system,find out the faults,remove the faults quickly and restore the normal power supply.Combined with the application of practical engineering and the present situation of railway power fault treatment,and based on the analysis of various types of fault characteristics and fault features of railway power supply system,a fault location system for railway power supply system based on fault indicator is designed according to the characteristics of the electric transmission line of railway.This paper carefully studies the special railway fault indicator,supporting communication management terminal,and the working principle of the signal source device and the main station system of the ground detection.In the event of a short circuit in the line and grounding fault,railway-specific indicators judge short circuit fault through normal load of electric field and magnetic field inductive line,overcurrent sudden change current,line power loss,judge grounding fault through the detection of special square wave signals,and transmit the fault information to the nearby supporting communication management terminal,so that the terminal starts fault detection and judgment,and converts the information into the message of corresponding short circuit and grounding fault,sending the fault information to the main station system through the communication terminal after the fault signal is determined,and analyzing the fault information in the main station system in combination with the topology structure of the power supply system to determine the fault section.This paper completes the construction design,installation and commissioning of the whole fault location system.Combined with the system operation,it improves the applicability of the fault location system and the standby automatic switching device,and improves the start-up setting of the fault indicator,so as to improve the accuracy of the system positioning.