Power grid is a network that delivers electricity from generating station to consumers. Grid efficiency and reliability can be increased by implementing real time monitoring of high voltage devices and transmission line. It helps in fault detection and hence avoids cascading failure initiated by a single fault. Real time monitoring is provided by low cost devices such as wireless sensor nodes. Wireless sensor nodes are battery operated devices and replacing theses batteries is one of the major drawback of it. These monitoring devices can be made self sustainable by harvesting varying magnetic field around high voltage devices and overhead transmission line. The amount of energy harvested by magnetic field harvester depends on magnetic core, field intensity, de-magnetization effect, and distance between harvester and magnetic field. This paper provides an overview of different magnetic field harvesting techniques employed in power grid.

Wireless sensor node, Smart grid, magnetic field harvesters, real time monitoring

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