Reliability Planning for $2\mathrm{x}25$ kV Traction Power Supply System: Fault Severity and Contingency Analysis

The involvement of autotransformers in a
$2\mathrm{x}25 \mathbf{kV}$
traction system increases the severity of faults. Unattended faults lead to component failure, making reliability planning essential for the system. This paper proposes a method of estimating the fault current variation with fault location using a node-admittance matrix-based approach. The system is further analyzed during various contingencies to ensure a robust design, and its performance is enhanced using Static Var Compensators (SVCs), An optimal voltage compensation algorithm is proposed to trigger in the event of any outage. A comparative analysis is presented on a 30 km sample feeding section, with SVCs placed at the substation and then at the sectioning post.