POWER SUPPLY SYSTEM FOR CAVERN EXCAVATION

摘要

PURPOSE: A power supply system for a cavern excavation is provided to install a power cable only by 1 feeder when a length of a cavern is extended during excavating the a cavern. CONSTITUTION: An automatic voltage control single wire transformer includes an automatic voltage control unit which stably supplies a power in response to the change of a load in an output terminal every predetermined lengths according to a threshold value of a voltage drop allowed which responds to an extension of a length of a cavern. A general single wire transformer compensates for a lack amount of a starting voltage of a load. A power supply cable(206) supplies a power to the load. A temporary tunnel(202) is excavated as a connecting path between a ground and a cavern(201). A unit substation(203) is installed at the temporary tunnel(202). Power supply devices(204) are installed every predetermined distances according to an excavation of the cavern(201).