Feasibility Study of the Use of Current Limiting Devices in Interruption and Sectionalizing of DC Circuits in Mines.

摘要

The objective of the study was to determine the feasibility of using current limiting devices (CLD) in switching heavy DC currents (1,200and 600amperes) at utilization voltages used in the mining industry (300and 600volts,nominal). Use of a CLD in this application is based on its orders of magnitude change in resistance when it changes state (from liquid mercury to vapor) after being subjected to short time,high-density current. Switching times on the order of 3to 4 miliseconds have been obtained.