由於地下配電系統多數用戶負載是由分歧線路供電，而普遍使用於11.4KV或22.8KV分歧線路的200A配電肘型端頭(Elbow Connector)，常因施工時內部消弧棒(Probe)與壓接端子(Compression lug)相互鎖接不良，導致日後故障停電事故發生，嚴重影響供電，本研究即參考現場施工可能發生之鎖附不良狀況製作肘型端頭模擬樣本以進行電流溫升試驗，利用溫度記錄器量測樣本內部鎖接點溫度，並運用已相當成熟的紅外線熱像技術(IRT)檢測樣本表面溫度，由試驗資料分析發現，施工不良肘型端頭會出現較高溫升，藉由紅外線熱像檢測分析也確能發現其異常溫升特徵。
本文對於肘型端頭的紅外線熱像檢測表面溫度分佈資料，提出數種分析方法，均能辨識出異常溫升，其中「溫度分佈斜率法」與「溫差比較法」若交互運用，更能增加分析使用上的彈性和提高辨識準確度，此外，本文也利用實際試驗資料，並參考相關標準進一步探討和建立更為適當並符實際的檢測標準，經現場實例驗證，所提出之標準可準確且適當評估200A肘型端頭異常溫升的嚴重程度，標準中也包括如終端接頭等裸露式設備的檢測標準供參考。
本文研究結果，對於提升紅外線熱像檢測200A肘型端頭的預防性維護成效，極具助益，當可有效防範施工不當造成的故障停電事故，進而提高電力品質與供電穏定度。

The underground electricity supply to multiple user load of is normally done by using branch lines. However, most elbow connectors used in the 11.4KV or 22.8KV branch lines can break down and seriously cause electricity supply problems later on. This is often caused by internal arc suppression probe and compression lugs not properly connected together. This research uses the mature Infrared Thermography (IRT) to check the surface temperature of the connection point to see if there are temperature rises when the connections are not properly done. And the result does find abnormal temperature rises when connections are not properly made.
This thesis provides a few different ways to analyze the distribution of surface temperatures measured by IRT and are able to identify temperature rises. Among them, the temperature distribution slope and temperature difference comparison can be alternatively used to increase flexibility in the application and to improve precision of identification. Additionally, this thesis uses actual test data and related standards to further explore and establish more suitable and practical inspection standards. And through a real life case study, it proves that the proposed test standards can appropriately evaluate the degree of temperature of 200A elbow connectors. The test standards also includes inspection standards for exposed components such as terminal connectors for reference.
The result from this thesis’ study shows that IRT can be effective in detecting and in helping the preventive maintenance of 200A elbow connectors. It can effectively prevent interruptions of electricity supply caused by improper connection work and can consequently improve the quality of electricity supply.

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