The Feasibility of Low Current Fault Detection by Differential Current Measurement.

摘要

The report reviews various means for trolley line fault detection in coal mines and identifies some of the problems and limitations of these means. It then describes a new approach for fault detection based on the detection of current differences between feeder and load currents. Means are described for measuring feeder and load currents to a precision of about 1/2percent,comparing these currents in real time and tripping feeder circuit breakers when the currents do not essentially balance. Motive load currents are telemetered back to current comparing points via radio links.