The invention provides an AT traction network
short circuit fault
distance measurement method. The method comprises the steps: A, a
current sensor is arranged on each auxiliary?connection line CPWn between a protection line and a steel rail; in the case of
short circuit, a central controlling and
processing unit acquires at once current In of all auxiliary?connection lines measured by the current sensors, the largest auxiliary?connection
line current Ik and the second largest auxiliary?connection
line current Ik' are found out, k'=k+ / -1, and the central controlling and
processing unit determines the section between the auxiliary?connection line CPWk and the CPWk' to be the section where a
short circuit fault happens; B, the distance X between the
short circuit fault position and the auxiliary?connection line CPWk where the largest auxiliary?connection
line current Ik is located is found out, in the formula shown in the description, D is the distance between the auxiliary?connection line CPWk and the CPWk'; and finally the distance between the fault and the
traction substation can be obtained. According to the method provided by the invention, the traction network
short circuit fault position in high speed railway full parallel AT power supply?mode can be quickly and accurately measured, timely maintenance is facilitated, and loss expansion and accident happening can be more effectively avoided.