He Wei, Yang Aichao
School of Information Engineering, Baise University, Baise 533000, China.
Jiangxi Electric Power Research Institute, Nanchang 330096, China.
Micromachines (Basel). 2019 Jun 23;10(6):421. doi: 10.3390/mi10060421.
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.
本文提出了一种用于电网中两线电源线的剪切模式压电电流传感装置。该压电异质结构由一个钹形结构和一个坡莫合金板组成。钹形结构由永久磁铁、黄铜帽和剪切模式压电材料构成。坡莫合金板将两线电源线产生的磁场集中在磁铁上。在钹形结构的力放大作用下，该装置的响应得到改善。已制作了一个原型进行实验。在电流范围为1 - 10 A且分离距离d = 0 mm时，该装置的实验平均灵敏度为12.74 mV/A，分辨率达到0.04 A。根据实验电压分布，在1.5 A时计算出的精度为±0.0177 mV。电流 - 电压结果表明，所提出的异质结构也可以用作无偏置的磁电装置。
