城市轨道交通供电系统光纤纵差保护判据仿真研究

城市轨道交通供电系统的电压等级较高、输送距离短且较多采用电力电缆进行电能的传输,本文针对光纤纵差保护原理,开发了基于PSCAD/EMTDC的故障分量相量的差动保护判据和基于故障分量采样值的差动保护判据的差动保护模块,仿真了这两种差动保护判据在广州地铁二号线电力电缆线路上应用的效果。结果表明,所建立的继电保护模块能够正确实现相应的保护原理所应实现的功能,与常规相量差动保护判据相比,本文所研究的保护判据允许接地过渡电阻的能力及灵敏性方面具有明显的优势。

Simulation of Fiber-optical Differential Protection Criterion on the Power System of Urban Mass Transit

The power system of urban mass transit is characterized by a high voltage,short-distance transport and more use of electric cables for power transmission.The paper analyzes the principle of differential protection,designed the fault component vector quantities differential protection and fault component sampled value differential protection in PSCAD/ EMTDC.It effect that the simulated this two kinds differentials protection in Guangzhou Metro Line two.The results show that the relay module can establish the corresponding function of the correct principles.Comparing to the conventional pharos differential protection criterion,the protection criterion has obvious superiority on sensitivity and capability of avoiding the influence caused by transitional resistance in the paper.