城市轨道交通环网差动及零序电流回路检测方法研究

Study on Inspection Method of Differential and Zero Sequence Current Circuit for Loop Network of Urban Rail Transit

城市轨道交通区间环网电缆光纤差动电流保护和零序电流保护回路极性及完整性的检测一直是困扰电气试验人员的难题。本文研究通过将整流变压器低压侧短路产生电流的方法,验证城市轨道交通区间环网电缆光纤差动电流保护及零序电流保护回路的极性和完整性,该方法经现场测试应用效果良好。

The inspection of polarity and integrity of fiber optic differential current protection and zero sequence current protection circuits for loop network cables in urban rail transit has always been a difficulty for electrical testing personnel.The paper studies the method of generating current through short circuits on the low-voltage side of rectifier transformer to verify the polarity and integrity of fiber optic differential current protection and zero sequence current protection circuits for loop network cables in urban rail transit.The method has been tested and applied at site with good results.