| Urban rail transit with its advantages of efficient and convenient, safe and comfortable, large capacity, high-speed and punctual, less affected by natural environment has become the first choice to solve the traffic jam in major cities. Nowadays the urban rail transit construction is in the golden period in our country, to construct a reasonable model, analysis the distribution and influencing factors of stray current, have a monitoring of stray current corrosion, and take effective measures to protect stray current corrosion are important subjects in the construction and operation of urban rail transit, they also have significance theoretically and practically for the healthy development of urban rail transit in China.In this paper, based on the metro stray current static distribution model, simulated the metro locomotive dynamic operation process according to the traction calculation, then a metro stray current dynamic distribution model was established, and analyzed the influence of locomotives operation condition on the stray current distribution. The results show that: locomotives operation conditions have an significant effect on the distribution of rail potential and stray current, When the locomotives running at traction operation or braking operation, rail potential and stray current have larger values, more uneven distribution and more intense fluctuations.Meanwhile, this paper referred to the probabilistic load flow calculation in electric power system, based on the metro locomotives traction calculation and the established stray current dynamic distribution model, established the stray current dynamic probability distribution model, through the simulation analyzed the probability distribution characteristics of metro rail potential and stray current, results show that:the probability distributions of rail potential and stray current are not normal distribution, they are in unimodal convex distribution, and the value near average has the largest probability. When single-locomotive running, rail potential probability distribution is symmetry, and stray current is right; while multi-locomotives running simultaneously, the probability distributions of rail potential and stray current are approximate symmetrical. By analyzing the probability distribution of stray current, we can have a comprehensive analysis of rail potential and stray current probability and statistics characteristics, and these information has important reference value for the metro system safe and stable operation.Finally, we also analyzed and summarized the stray current corrosion principle, corrosion protection measures and stray current monitoring system. In particular analyzed the metro system protective measures, underground facilities own protective measures and the parameters monition of stray current corrosion. |
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