本文研究整套型變電站的弧光保護分析，主要探討個人安全與設備保護。個人安全方面以整套型變電站為研究對象，透過IEEE-1584之建議公式，進行弧光電流、弧光能量與弧光危險距離模擬計算，依據NFPA-70E危險等級的規定，預測其危險等級，及評估個人防護裝備要求，確保其工作安全。設備保護方面由上述之弧光故障分析，進一步針對整套型變電站探討不同之偵測方式與保護方法，並蒐集相關法規，佐以實際操作需求與經濟效益分析，建立弧光保護參考準則。研究發現：480V整套型變電站變壓器容量1,000kVA以下，將二次側主斷路器短延時保護設定在200ms以內時，個人防護裝備可降低至「危險等級2」；當加裝弧光保護，則其故障清除時間可控制在100ms以內，所以只要變壓器容量不超過3,000kVA，個人防護裝備亦可降低至「危險等級2」。

This thesis focuses on the arcing fault hazard analysis and protection for unit substation. Two main topics are extensively studied on this paper. (1)Personal safety: Based on IEEE Std 1584, establish a spread sheet to estimate the arcing fault currents, incident energy and flash-protection boundary for the subject unit substations. The results are used for predicting the hazard class and evaluating the personal protective equipment (PPE) required by NFPA-70E to ensure personal safety in the working area. (2)Equipment protection: With the estimated arcing fault data the various detection schemes and protection methods are commonly discussed for the subject unit substations. Furthermore, certain relevant codes, operation practices and economical feasibility are also reviewed. Finally, a suggestion is derived to provide design guidelines for selecting proper arcing protection scheme and the tripping devices setting. It conclude that in order to limit the HRC of PPE to class 2, for transformer with capacity less than 1,000kVA the short time delay setting of main circuit braker in secondary of transfer must within 200ms. Similarly, for transformer with capacity less than 3,000kVA if the fault cleaning time can be controlled within 100ms by installing the dedicated arcing protection devices, the HRC of PPE also can limit to class 2.

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