Patent ID: 7191074

Claim:
An electric power monitoring and response system for determining a power line physical sag condition associated with phase conductors of a multi-phase electric power line, comprising: at least one field sensor located below the phase conductors and positioned to obtain a measurement comprising a representation of the combined electromagnetic fields generated by the phase conductors; a controller configured to determine the power line physical sag condition based on the measurement received from the field sensor and to generate output signals based on the power line physical sag condition, wherein the controller comprises a local controller proximate to the field sensor, a central controller, and communication equipment for transmitting data associated with the measurement or the power line physical sag condition between the local controller and the central controller; and response equipment responsive to the output signals operative to display information associated with the power line physical sag condition, report information associated with the power line physical sag condition, or electrically compensate for a persistent high, current or a voltage sag condition indicated by the power line physical sag condition.