傳統比流器為電力系統量測中不可或缺的設備之一，但其鐵芯架構在故障發生時的飽和問題將造成電流的誤判斷，進而使得後端的保護電驛誤動作。目前針對改善傳統比流器鐵芯飽和問題及配合未來變電所智慧化的需求，已有多種電流量測技術問世。本研究採用之新型電流量測技術，設計使用霍爾感測器採角度對稱分佈的方式環繞於待測電力纜線上，稱作無鐵芯式霍爾比流器。但因霍爾感測器本身具有約2.5V的直流輸出偏壓，此偏壓將受到環境溫度影響而改變其大小值，此現象稱為熱漂移現象。此外，環境溫度亦影響霍爾感測器的靈敏度，這些都是影響無鐵芯式霍爾比流器量測準確度的因素。
本研究提出之自我校正法可以隨時偵測並校正無鐵芯式霍爾比流器之直流輸出偏壓，避免熱漂移現象的發生而影響電流量測準確度。此外，此方法亦可依環境溫度的改變補償量測靈敏度以得到較佳的量測準確度，最後亦針對IEC 60044-8電子式電流互感器規範進行電流準確度等級試驗，結果證明無鐵芯式霍爾比流器經本文所提出之自我校正法進行補償後，其百分比電流誤差可達計測用比流器規範中之準確等級Class 0.5。

Current transformers (CTs) are an indispensable equipment for power system current measurement. If a fault occurs in a power system, iron cores of CTs may face saturation problem and cause current measurement errors, resulting in false responses in protection relays. There are many kinds of current measurement technology to solve the saturation problem of iron cores of CTs and fulfill the requirements of intelligent substations. This research proposes a new current measurement technology using Hall integrated circuits (Hall ICs) symmetrically surrounding a power cable to measure the current flowing in it. This new electronic current transformer is called coreless Hall-effect current transformer (HCT). However, there is a dc offset voltage of about 2.5V existing in Hall ICs and the thermal drift phenomenon of this dc offset may arise due to ambient temperature. Furthermore, the sensitivity of Hall ICs may also be affected by ambient temperature. All of them are factors affecting accuracy of the HCT.
This thesis proposes an automatic dc offset calibration method to eliminate the dc offset voltages of Hall ICs. It can detect the dc offset voltage of Hall ICs at any time to avoid affecting current measurement accuracy due to thermal drift phenomenon. Another method proposed is for temperature calibration which can calibrate the sensitivity variation due to ambient temperature. This research also follows IEC 60044-8 electronic current transformer standard to perform the current accuracy test to verify the accuracy class of coreless Hall-effect current transformer. Results show that accuracy can achieve class 0.5 for measuring CTs.

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