Defect detector in power distribution system

A system comprising:

• a plurality of three-phase transformers, each having a primary winding and a secondary winding;
• a plurality of feeder lines, wherein each feeder line is coupled to the secondary winding of a respective three-phase transformer of the plurality of three-phase transformers;
• a plurality of switches, wherein each switch is upstream of the primary winding of a respective three-phase transformer of the plurality of three-phase transformers;
• a plurality of three-phase voltage meters, wherein each three-phase voltage meter reads a three-phase voltage of a respective feeder and provides voltage data;
• a memory for storing machine executable instructions;
• and
• a processing unit comprising one or more processor cores that access the memory and executes the machine readable instructions, the machine readable instructions comprising:
• a defect detector that receives the three-phase voltage data from each of the plurality of three-phase voltmeters, wherein the defect detector generates an alert indicating that a potential defect exists at a given switch of the plurality of switches in response to the voltage data indicating:
• (i) a drop in two or more phases of voltage at a given feeder line of the plurality of feeder lines within a predetermined amount of time of toggling of the given switch;
• or
• (ii) a drop in two or more phases of voltage of at least two or more feeder lines of the plurality of feeder lines;
• and
• a graphical user interface that outputs data uniquely identifying the given switch from the plurality of switches.