OVERCURRENT-FAULT INDICATOR APPARATUS FOR TRUNK LINES OF AN ELECTRICAL POWER DISTRIBUTION SYSTEM

摘要

Disclosed is an overcurrent-fault indicator apparatus for locating a trunk line fault in a power distribution system. The apparatus includes a pair of input terminals adapted to be connected with the primary and secondary of a power distribution transformer, first and second switches which may be a zener diode and reed-type contact, respectively, coupled to the first input terminal through a full wave rectifier, indicating display means which is actuated by the closing of the first and second switch, and second switch closing means coupled to the other input terminal for closing said second switch, this closing means including time delay circuitry provided by a resistor and capacitor for temporarily delaying the opening and closing of the reed switch.