Testing and Improvement of Power Current Microsensors

• Main Authors: Kun-Long Chen, 陳坤隆
• Other Authors: Nanming Chen
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/g3nggk

碩士 === 國立臺灣科技大學 === 電機工程系 === 94 === In a power system, the current transformer is adopted as a means to measure the magnitude of current so as to achieve the goal of detecting faults and protecting the power system. Power system fault currents contain large DC offset and render the core of the current transformer to be saturated. Whenever saturation phenomenon occurs in the core, it will cause the protective system to make false responses. Furthermore, the bulky volume of the core will also impose a restriction on other applications. Owing to these limitations, this research is designed to take advantage of Hall elements to measure the magnetic field and subsequently the current. Based on this attribute, the Hall element can be used to measure the magnetic field outside the insulator when electric current flows in an electric conducting wire. In the measuring system developed in this study, LabVIEW, the core measurement tool, is used to measure element characteristics and transient waveforms of the Hall voltage. Consequently, the study aims at examining the feasibility of power current microsensors and to propose possible amendments to this design.