本文对牵引变电所变压器保护和馈线保护这两个模块进行了研究，分析了牵引供

Paper feeder traction substation transformer protection and protect the two modules have been studied, analyzed the composition of traction power supply system, the traction power supply substation, and the load characteristics of electrified railway. <br>Because of its electric railway having impact load, mobility, a wide range of current variation, a large inrush current, higher harmonic content is different from the general characteristics of the load, and the power supply using single-phase supply, fault type relatively simple three-phase fault, Therefore, the protective design of the module also from a general protection design, the protection of the feeder with respect to different principles is generally substation. Automatic anti-accident protection device for a power system, when the system can not function properly or failure, quickly and accurately cutting element or failure signals for timely processing. Visible protection is an integral part of any power system essential to ensure the safe operation of the system to ensure power quality, prevent the occurrence of failures and accidents to expand, there is an extremely important role. <br>By analyzing the composition and characteristics of the load traction power supply system of electrified railway, and the study of the direct supply of electric railway power supply fault type, feeder protection principle based on the existing analysis, a number of the protection device is completely necessary, to within a few seconds after a short circuit accident of the primary device is not damaged, the short-circuit current is cut, so that from the point of power failure, thereby protecting the devices in a short circuit, and quickly restore the normal work of the other parts of the system. <br>With further optimization of substation protection technology, greatly improving the security and stability of the entire grid operation, greatly reduce the labor intensity of running maintenance personnel, technical protection authorities will pay attention to the power industry, becoming the core technology of substation design one.

In this paper, the two modules of transformer protection and feeder protection of traction substation are studied, and the composition of the traction power supply system, the power supply mode of the traction substation, and the load characteristics of the electrified railway are analyzed.<br>Because of its load impact, mobility, wide range of current changes, excitation surge flow large, high harmonic content is different from the characteristics of general load, and the power supply mode uses single-phase power supply, the fault type is simpler than three-phase failure, so its protection module design is also different from the general protection design, The principle of feeder protection is different from that of a general substation. Relay protection is a kind of anti-accident automatic device of power system, which can quickly and accurately remove faulty components or send signals in time for processing when the system fails or is not running properly. It can be seen that relay protection is an essential part of any power system, which plays an extremely important role in ensuring the safe operation of the system, ensuring the quality of electrical energy, preventing the expansion of failureand and the occurrence of accidents.<br>Based on the analysis of the composition of the traction power supply system and its load characteristics of the electrified railway, and the study of the fault type of the direct supply mode of the electrified railway, a certain number of protective devices are necessary on the basis of the analysis of the existing feeder protection principle, so that a certain number of protective devices can be destroyed in seconds after a short circuit accident. Cut the short-circuit current and remove the point of failure from the power supply, protecting the single device in the short circuit while quickly restoring the rest of the system to work.<br>With the further optimization of substation relay protection technology, greatly improve the safety and stability of the entire power grid operation, greatly reduce the labor intensity of the operation and maintenance personnel, relay protection technology will attract the attention of the relevant departments of the power industry, and become one of the core technologies of substation design.

This paper studies the two modules of transformer protection and feeder protection in traction substation, analyzes the composition of traction power supply system, the power supply mode of traction substation, and the load characteristics of electrified railway.<br>Because the electric railway load has the characteristics of impact, mobility, wide range of current change, large inrush current, high harmonic content and so on, which are different from the general load, and the power supply mode is single-phase power supply, the fault type is simpler than three-phase fault, so the design of its protection module is also different from the general protection design, and the principle of its feeder protection is relative to the general substation It's different. Relay protection is a kind of automatic anti accident device in power system. It can quickly and accurately cut off the fault components or send out signals in case of system failure or abnormal operation for timely processing. It can be seen that relay protection is an essential part of any power system, which plays an extremely important role in ensuring the safe operation of the system, ensuring the power quality, preventing the expansion of faults and the occurrence of accidents.<br>Based on the analysis of the composition and load characteristics of the traction power supply system of the electrified railway, as well as the study of the fault types of the direct power supply mode of the electrified railway, on the basis of the analysis of the existing feeder protection principle, a certain number of protection devices are absolutely necessary, so as to cut off the short-circuit current within a few seconds after the occurrence of the short-circuit accident, so as to The fault point is separated from the power supply, so as to protect the primary equipment in the short circuit circuit circuit and quickly recover the work of other normal parts of the system.<br>With the further optimization of substation relay protection technology, greatly improving the security and stability of the whole power grid operation, greatly reducing the labor intensity of operation and maintenance personnel, relay protection technology will attract the attention of relevant departments in the power industry, and become one of the core technologies of substation design.