A remote monitoring system is presented. The system includes a sensor unit disposed in the electrical device, and configured to obtain measurement characteristics in response to a measurand of the electrical device, obtain reference characteristics insensitive to the measurand of the electrical device, and communicate the measurement characteristics and the reference characteristics using time varying electromagnetic fields. Further, the system includes a reader unit to establish a far-field communication with the sensor unit in the presence of at least one metallic interferer in the electrical device, wherein the reader unit is configured to receive the time varying electromagnetic fields associated with the measurement characteristics and the reference characteristics in response to a radio frequency signal transmitted to the sensor unit, and determine the measurand of the electrical device based on at least one property of the received time varying electromagnetic fields associated with the measurement characteristics and the reference characteristics.