关键词: 双线轨道电路图, 设计流程, 极性交叉, 断流点

Abstract: This paper quotes the definition of a double-line track circuit diagram, introduces its seven design steps in detail, and analyses these following points carefully: the selection of the locations of switch machines, the requirement that AC track circuits meet the condition of polar transposition, the principles of arranging the feeding ends and receiving ends, and the plans for setting the cut-off points of choke transformers. It provides a reference scheme and suggestions for the designers of double-line track circuit diagram.

Key words: double-line track circuit diagram, design steps, polar transposition, cut-off point