1405

Online monitoring equipment is playing an increasingly important role in the electrical power networks, where its use can help reduce maintenance costs and improve grid system reliability. In this context, energy arvesting technology can help online monitoring equipment get rid of battery power supply shackles. A novel non-invasive helical core can scavenge the magnetic field energy efficiently near the current-carrying cable. In this paper, to research the optimization design method of helical magnetic core, a new method for optimizing the air gap of the helical magnetic core is proposed. A parameter K is introduced to represents the ratio between the air gap and the thickness of a single helical. When K is in the optimal range, the open-circuit voltage can be increased by 25.71%. Therefore, the proposed air gap optimization method can significantly improve the energy extraction capacity of the helical core.