Chain Circuit Model-based Rail Potential Analysis of AC Traction Power Supply System for Urban Rail Transit
The urban rail transit AC 3 kV traction power supply system overcomes both problems of stray current in DC system and cyclic commutation in standard frequency single-phase AC system.In this work,the chain network circuit model of AC traction power supply system was established,and the influencing factors of rail potential were analyzed by power flow calculation.The results showed that any of the following changes would lead to reduced rail potential:reducing the distance between cross-links,shortening the distance between the traction substations,reducing the leakage imped-ance,and increasing the cross-sectional area of the return line.The measures of adding integrated ground wire and up-down parallel connection at the horizontal channel were put forward,whose practical execution brought about effective re-duction in maximum rail potential by 42.99％.
rail potentialtraction power supplychain circuit modelurban rail transit
万方数据
维普
