Abstract
This paper presents a shear-mode piezoelectric current sensing device for two-wire power cords in electric power grids. The piezoelectric heterostructure consists of a cymbal structure and a permalloy plate. The cymbal structure is constructed from a permanent magnet, a brass cap, and shear-mode piezoelectric materials. The permalloy plate concentrates the magnetic field generated by the two-wire power cord on the magnet. Under the force amplification effect of the cymbal structure, the response of the device is improved. A prototype has been fabricated to conduct the experiments. The experimental average sensitivity of the device is 12.74 mV/A in the current range of 1–10 A with a separating distance of d = 0 mm, and the resolution reaches 0.04 A. The accuracy is calculated to be ±0.0177 mV at 1.5 A according to the experimental voltage distribution. The current-to-voltage results demonstrate that the proposed heterostructure can also be used as a magnetoelectric device without bias.
Highlights
Electricity monitoring of power lines based on current sensing devices is of great significance to improve the security and reliability of the electric power systems
Non-resonant piezoelectric current sensing devices were developed for a single wire in electric power grids [13,14], which operate non-invasively and exhibit high linearity, but the proposed structures are not suited for a two-wire power cord carrying identical currents in opposite directions
Magnet were to constitute thewas cymbal structure using insulate epoxy using insulate epoxy adhesive, andbonded the cymbal structure naturally dried in the air. (3)
Summary
Electricity monitoring of power lines based on current sensing devices is of great significance to improve the security and reliability of the electric power systems. Non-resonant piezoelectric current sensing devices were developed for a single wire in electric power grids [13,14], which operate non-invasively and exhibit high linearity, but the proposed structures are not suited for a two-wire power cord carrying identical currents in opposite directions. Ren et al [15] presented a shear-mode piezoelectric vibration energy harvesting device with a maximum. Ren et al [15] presented a shear-mode piezoelectric vibration energy harvesting device with a maximum output power of 4.16 mW. The brass cap, the shear-mode materials, andresults the permanent magnet constitute and the permanent magnet constitute a piezoelectric cymbal structure, which in force amplification and apotential cymbal structure, which in force to amplification andTheoretical potential enhancement of the response enhancement ofresults the response the currents. Bias magnetic [21,22,23,24]
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