电力牵引供电系统是指从电力系统或一次供电系统接受电能，通过变压、变相或换流（将工频交流变换为低频交流或直流电压）后，向电力机车负载提供所需电流制式的电能，并完成牵引电能传输、配电等全部功能的完整系统。牵引供电系统的性能直接影响列车牵引功率的发挥和牵引传动控制系统的性能。
电力牵引供电系统担负着向电力机车不间断供电任务，乃是电力系统与用户间的桥梁。
The electric traction power supply system is shouldering the duty of uninterrupted power supply to the electric locomotive, it is the bridge between the electrical power system and users.
最后，通过对牵引供电系统异相电弧短路和电力机车运行过程的仿真，验证了保护方案的正确性，有效性和可行性。
At last, the accuracy, efficiency and feasibility are indicated by analyzing the simulation datum of the arc wrong-phase short circuit and the running of the electric locomotive.
无功、负序和谐波的不良影响需要在电力系统进行评估，在牵引供电系统中采取技术措施以期综合解决。
The harmful effects brought by reactive power, harmonics and negative sequence usually be evaluated on some sensitive power system nodes and be comprehensive solved in the traction power system.
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