Split-core magnetoelectric current sensor and wireless current measurement application

Abstract

This paper proposed a split-core magnetoelectric current sensor consisting of a symmetric Terfenol-D/PZT/Terfenol-D composite, three magnetic core, a pair of permanent magnets and a packaging shell. The Terfenol-D/PZT/Terfenol-D element and three magnetic cores are connected in series to form a closed magnetic ring. In practical application, the sensor can be opened and closed during installation. For detecting the 50 Hz current, the detection sensitivity reaches 52.79 mV/A with R2 = 0.9988 in range of 10A to 1000A. In order to realize the wireless and self-powered measurement of current, this paper proposed a wireless current measurement system combining the split-core current sensor, a RMS detection module, a 4G-RTU module, a current transformer energy harvester and a monitoring platform. Within the allowable error range, the proposed measurement system can realize the wireless measurement of 50 Hz current. These results show that the proposed split-core magnetoelectric current sensor is expected to provide a new idea about current on-line monitoring for Internet of Things in Power Systems, which is of great significance and application.