Question
How to model a moving train in Right-of-Way?

Under certain conditions (staggered insulated joints, damaged insulated joints, etc.), rail GPR and rail-to-rail voltages can vary considerably as a function of train location. If the worst train location is obvious in a study, then

• Connect the two rail phases with a very low impedance for the section in which the train is located;
• Run the corresponding SPLITS simulation.

The worst rail GPR and rail-to-rail voltage are then obtained. However, if the worst train location is unknown, a moving train should be simulated (a train can appear at any location). This can be done using the “Monitor Fault” option:

• Select one of the rails to be the faulted phase;
• Select the other rail to be the reference phase;
• Define the fault location along the right-of-way at desired steps (intervals);
• Run Monitor Fault.

The final envelopes (maximum rail GPR and rail-to-rail voltages) are then extracted and the worst train location is identified.