傳統比流器在應用上有著交流飽和、直流飽和及殘磁等問題，而這些問題完全起源於比流器本身鐵芯的磁滯特性。在電力系統發生故障時，故障電流含有過大的直流偏移電流成份使得比流器的鐵芯發生飽和現象，因而造成二次側電流失真，使電流偵測產生誤差及電驛誤動作，將大大影響電力系統的安全性跟可靠性。此外，傳統比流器亦有體積大、重量重之缺點，侷限了電力保護系統的發展與應用。
基於傳統比流器的問題，已有研究利用霍爾感測器設計出無鐵芯式霍爾比流器，因其不需使用鐵芯，不會有鐵芯飽和的問題，且體積也較小，然而霍爾感測器屬於IC電子零件，其壽命長度可能不如傳統比流器，因此為延長無鐵芯式霍爾比流器的使用壽命，本研究為其設計一個由多組霍爾感測器所構成的多感測模組備用機制，藉此來延長使用壽命，增加其可靠度及均化誤差，模擬及實測的結果皆證明能達到此效果。本研究亦針對IEC 60044-8電子式比流器規範進行電流準確等級試驗，實測結果證明本研究所設計之具有備用機制的無鐵芯式霍爾比流器在計測用電流誤差準確等級可達Class 0.5。

In the application of traditional current transformers (CTs), there are problems of AC saturation, DC saturation and residual magnetism. These problems are caused by the magnetic hysteresis characteristic of CT iron cores. When a fault occurs in a power system, the excessive fault current containing direct current offset will not only cause saturation phenomenon of the CT iron cores, but also cause current distortion in the secondary windings which results in inaccurate responses to current measurements and protective relays. This will greatly affect the safety and the reliability of the power system. Moreover, traditional CTs also have some drawbacks such as large volume and heavy weight. Therefore, the development and application of the power protective system is limited.
Due to the problems of traditional CTs, some researches apply Hall sensors to design a coreless Hall effect current transformer (HCT). The saturation phenomenon of iron cores will not occur in the HCT because it does not need iron cores. As a result, its volume is also smaller than the traditional CTs. However, Hall sensors are electronic components. Their life span may not be so long as the traditional CTs. In order to extend the life span of the HCT, this research designs a multiple sensing modules redundancy function composed of multiple Hall sensor groups for the HCT. This redundancy function is also able to increase the reliability and equalize the error of the HCT. According to IEC standard 60044-8, the HCT with redundancy function designed by this research can achieve the current error accuracy class 0.5 for measuring CTs.

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