A non-invasive electric current sensor employing a modified shear-mode cymbal transducer

作者：He, Wei^*; Lu, Yueran; Qu, Chiwen; Peng, Jiancai

来源：Sensors and Actuators A: Physical , 2016, 241: 120-123.

DOI：10.1016/j.sna.2016.02.015

• Non-invasive sensor
• Electric power grid
• Shear-mode cymbal transducer
• Halbach array
• Ampere force

This paper presents a non-invasive sensor for electric current monitoring in electric power grid. The sensor consists of a modified shear-mode cymbal transducer and a Halbach array attached on the transducer. The Halbach array generates concentrated magnetic flux density on the side where the electric wire is placed and lowers the magnetic field on the other side. The wire experiences an enhanced Ampere force when energized, and the resulting reaction force of the Ampere force is further amplified by the cymbal transducer. The transducer works in shear mode and produces a voltage proportional to the applied electric current. At low frequencies, the sensor exhibits a flat voltage response. The non-resonant sensitivity of the sensor reaches similar to 6.98 mV/A over the frequency range of 10-80 Hz with a separating distance of d= 3.0 mm. The average sensitivity is 6.97 mV/A with high linearity at the power-frequency of 50 Hz, and a small current step change of 0.05 A can be clearly distinguished.

• 出版日期2016-4-15
• 单位百色学院