Electricity
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Gwangju Metro uses substations which receive electricity of 3 phases 4 line 22.9KV from Korea Electric Power Corporation (“KEPCO”) in multi-earth system and also act as a liaison substation to contact between substations when a certain station is in failure.
Operated under unmanned Supervisory Control and Data Acquisition(SCADA)in principle 3 air cooling rectifiers of 2500KW which convert AC to DC are installed at each substation a nd 2 of them are permanently operated and 1 is reserved for spare. The electricity supply method to the railroad adopted parallel supply method which 2 substations supply electricity to each railroad in order to share load and either substation supplies electricity when the other substation is in failure
Trolly Wire Facilitywhich supplies electricity to the train Supplies electricity to current collector of the train by sliding contact and is divided to Catenary Wire and Re-Bar Wire. Catenary wire is installed on the ground and consists of Messenger Wire which supports Trolly Wire to keep it in a certain height and accessories. Re-Bar Wire is installed in the underground tunnel sections and consists of Al T-bar which supports Trolly Wire and other supporting accessories.
Digital Protection Relay
Digital protection relay is installed in the substation and distribution board of electric room of the station in order to minimize the errors of the current analog relay and supplies stable electricity through accurate data analysis when electricity failure occurs.
SCADA Facility
Supervisory Control and Data Acquisition (SCADA) is a facility which remotely monitors the power systems distributed in several places such as substation and electric rooms of the station. It collects and analyzes the data accurately when an error occurs with power facility.
Facility and Equipment
Recovery Inverter System Recovery energy which could be converted to electric energy while the subway train reduces its speed or stops. This is a facility which reuses such recovery energy through a recovery inverter.