| Title |
Self-powered Charging Circuit Design of Remote Monitoring Device for Electric Railway Feeder Line |
| DOI |
https://doi.org/10.5370/KIEE.2023.72.10.1237 |
| Keywords |
Railway feeder line; Remote monitoring device; SCADA; Self-powered charging; Split current transformer |
| Abstract |
Electric railways have many advantages in terms of passenger and freight capacity, energy efficiency, and reliability. The electric railway substation receives 154[kV] power from KEPCO and supplies it to vehicles through a Scott transformer and an auto transformer. There are AT method, BT method and direct method in the power supply method of AC electric railway in Korea. In the domestic railway system, the AT power supply method is introduced for induced interference and long-distance power supply.
AT is installed at intervals of 8 to 12[km] on the railway feed line and used by connecting the neutral point of the transformer to the line. In addition, various monitoring sensors using a mechanical protection relay or a digital IED are installed to monitor the system in real time. The KEPCO power grid, which is the upper stage of the electric railway feeder line, also introduced the SCADA system and is operating a fault detector or remote terminal unit for remote monitoring and control of the power line. In the case of using a battery for the power of the fault detector of the line, it is avoided due to natural discharge and inconvenience of replacement. A method of securing power by installing solar panels has also been proposed, but securing power at night or during the rainy season is uncertain and causes other problems such as maintenance. Thus, there is an attempt to solve the power supply problem by magnetically inducing the current of the feeder line through a split current transformer and charging the capacitor. The remote fault detector in the management system of the electric railway feeder or transmission line plays a role in acquiring and transmitting data. This remote fault detector uses the magnetic induction phenomenon from the transmission line and the feeder to supply power by itself. In this paper, a remote fault detector is introduced, a verification system for magnetic induction power is implemented, and a charging circuit is designed and tested. |