The analysis and simulation to the add-in DC reverse testing pulse based current-leakage protection method for DC trolley system

Based on the analysis to various current-leakage protection methods for DC trolley system, especially to the method based on add-in AC testing signal, a research on a new current-leakage protection method for DC trolley system based on add-in DC-reverse testing pulse is presented. Considering of the effects of four distributing parameters of the long wire, i.e. line inductance L, line capacitance C, line conductance G and line resistance R, the design principle of the controller for current-leakage protection system of DC trolley system is discussed in detail, and the corresponding simulation results are presented in this paper which validate the correctness of the analysis to the above mentioned new method.