White noise detection and adaptive adjustment of T-R short-circuit rail potential for improved high-speed railway overhead contact systems

High-speed railway T-R (locomotive-rail) has fast operating speed, stable current transmission, and features such as safe contact performance between pantograph and catenary. Dynamic detection requires the use of a large number of sensing technology equipment and parameter sampling devices. Usually, static testing and adjustment are carried out first, to make the technical parameters meet the design standards; white noise is a filtered signal that affects the accuracy of T-R short-circuits potential parameter measurement. Excessive error fluctuations caused by white noise lead to current interference, which can trigger short circuits and increase the potential difference in the system. Firstly, the measurement methods of T-R parameters and the characteristics of white noise are analysed in the article; Secondly, an adaptive adjustment algorithm that suppresses rail short-circuit potential differences and mitigates white noise-induced errors and interference, ensures the safety and stability of locomotive and pantograph network current transmission. Finally, experiments and theoretical simulations, prove the effectiveness of grounding resistance in terms of error and suppression of interference fluctuations, constraining and limiting the potential dispersion of rail short-circuit current has a good inhibitory effect.