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