Prediction and Measurement of Voltage Drop on Extended Feeding Condition in Electrified Railway

초록

The power supply system in Korean electrified railway has adopted AT feeding. This system usually has the feeding distance of about 25km per one phase, M phase or T phase, in Korea. If a fault occurs in some substation for any reason, the vicinity substation must feed electric power on the outage substation through catenary. So, the feeding distance grows twice of the normal state at N-1 fault state. If substation’s feeding distance is longer than normal condition, the catenary impedance and train to supply electric power from the substation. Therefore, the voltage drop can occur and N-1 contingency of substation must be considered at the design of substation capacity. The analysis of electric railway should be done by computer simulation because of complicated train movement and the accuracy of simulation must be guaranteed. This paper presents the analysis of voltage drop on N-1 fault in traction power supply system. To decide the voltage stability at N-1 condition, Computer simulation is performed at specific substation at first. Field test is carried out after simulation. Two results by simulation and measurement are compared.