| Wideband current wireless measuring device based on tunneling magnetoresistance effect |
| 投稿时间：2023-01-06 修订日期：2023-04-19 |
| 查看全文(View full text) View / Add Comment Download PDF Reader |
| English Abstract: |
| Wideband electrical quantity data contains a large amount of fault transient information. Due to the limited bandwidth of the traditional transformers, it is difficult to measure the wideband transient signal accurately and comprehensively. Aiming at this problem, a noninvasive current measurement method with precise time scale is proposed and a principle prototype is designed. The magnetic field induced by the line current is measured by the tunneling magnetoresistance(TMR) chip. The transformation ratio is calculated according to the relative installation position between the measured conductor and the TMR sensor and the wave is recorded and read by the microcontroller unit(MCU). The sensor module circuit with wideband, low noise and variable gain, and the transient recording wireless measurement transmission module circuit are designed to accurately perceive wideband signals. Then, according to the actual installation position of the sensor, the transfer relationship formula is deduced to realize the accurate calculation of the primary current. The testing platform is built to test the DC, AC and transient signal transmission capability of the measuring device, and the grounding fault current measurement comparison experiment is carried out by 10 kV distribution network. The main factors affecting the measurement accuracy of the TMR sensor are analyzed. The results show that the measurement error of DC and 50 Hz signals of TMR sensor is less than 1% and the measurement error of high frequency signal of TMR sensor is less than 3 %. |
|
| English and key words:tunneling magnetoresistance sensors wideband transients noninvasive measurement |
| 基金项目:国家重点研发计划项目(2022YFB3206800)；国家自然科学基金重点资助项目(52037001)；湖南省研究生科研创新重点项目(CX20210740) |
| DOI：10.16081/j.epae.202306010 |
| Colse |
