500 / 2022-03-21 20:54:43

Research on evaluation method of dynamic distribution of rail transit stray current

Stray current; DC metro system; Traction characteristics; Transition resistance; Ground

In order to quickly obtain the dynamic distribution of rail transit stray currents, a dynamic stray current model considering traction characteristics is proposed in this paper, and the static rail branch scatter matrix and conduction matrix are formed by using the node-branch refinement technology of the static rail model, the transition resistance matrices of the ascending and descending rails are introduced to form the decoupling matrix of the ascending and descending rails, and then the traction characteristics of the train are correlated with the track nodes, and the dynamic node current column vector of the train running in real time is obtained. Current dynamic distribution. The calculation results show that the stray current envelope is fin-like. The peak value of the fin-shaped curve is obtained when the train runs to the middle of the power supply section during the acceleration phase. At the same time, the train is located near the midpoint of the long section at the moment of maximum traction current, and the traction current conducts for a longer distance on the track section, thus leaking more into the ground. This paper can provide a reference for basic theoretical methods for stray current modeling considering the traction characteristics of rail transit, and provide basic method support for stray current analysis and early warning.