Patent ID: 7683798

Claim:
An electric current monitoring and response system for high voltage electric power lines, comprising: one or more electrically conductive, non-electromagnetic housings configured to be electrically grounded in a position within electromagnetic fields created by phase conductors of one or more multi-phase, high-voltage electric power lines; a set of electromagnetic field sensors laterally distributed within the housings configured to simultaneously measure a combined electromagnetic fields generated by the phase conductors; for each of a plurality of electric current values for the phase conductors, electronics defining an impedance network operative for combining the measurements received from the electromagnetic field sensors to create an output signal indicative of the associated electric current value, wherein the electromagnetic field sensors and electronic defining the impedance network consist of passive components that do not require an electric power source other than the electromagnetic fields generated by the phase conductors; and response equipment operative to implement a response action based on the electric current values.