Research on Synchronous Measurement Methods Based on Non-Contact Sensing

Non-contact sensing technology is increasingly gaining attention for its benefits of ease of installation, cost-effectiveness, and flexibility. This study introduces a non-contact synchronous phasor measurement technology, tailored for areas with high permeability in the new energy sector, and develops its prototype based on 3-D printing technology and Printed circuit board (PCB).The non-contact voltage probe, constructed through capacitive coupling techniques, calculates voltage via the sampling difference between two probes. Utilizing tunnel magnetoresistance (TMR), the research introduces linear array prototypes of four TMR chips for non-contact current measurement. The sensor’s actual sensitivity is confirmed through regression analysis, markedly enhancing measurement accuracy. Under laboratory conditions, the test results indicate that the voltage amplitude measurement error remains below 1%, with a phase angle measurement error under 0.4°. Similarly, the current amplitude measurement error does not exceed 2%, and the phase angle measurement error is below 0.1°.