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室外轨道电路故障，一般可分为短路故障和断路故障2种。按传统的故障判别方法，由于轨面电压会在故障点前后发生突变，一般用万用表逐点测试轨面电压值，根据轨面电压值的变化情况，即可查出断路故障点；而对短路故障，由于故障时轨面电压几乎为零，且故障点前后基一没有变化，
Outdoor track circuit failure, the general can be divided into short-circuit fault and open circuit fault 2 species. According to the traditional method of fault identification, as the rail voltage changes suddenly before and after the fault point, the rail voltage is usually tested point by point by the multimeter. According to the change of the rail voltage, the fault point can be detected. Fault, due to fault rail surface voltage is almost zero, and before and after the failure point based on a change,