臺灣博碩士論文加值系統

本論文進行傳統法與類神經網路法應用於油浸式電力變壓初期故障診斷效能之比較性研究。傳統診斷法包括變壓器異常判斷法、數碼法及氣體模式法，其中數碼診斷法包括Dornenburg、Rogers、IEC、日本電協研、Glass及Laborelec等6種，類神經網路法方面，則選擇徑向基、倒傳遞及支撐向量機等3種。研究中所採用的分解氣體樣本來自高雄港務局、台灣電力公司及IEC資料庫。研究結果顯示3種類神經網路輸入採單獨氣體濃度效能高於IEC數碼診斷法。於測試未知輸入樣本上，支撐向量機法準確性為97％，訓練時間56秒；徑向基網路法準確性93.9％，訓練時間89分；倒傳遞網路法準確性78.8％，訓練時間19分5秒。可見支撐向量機及徑向基網路之準確性是可被接受的，但徑向基網路訓練花費時間過長，於快速變壓器故障診斷上較不適合。此外，在實際變壓器故障診斷上，5組油中氣體，分別由傳統診斷法及類神經網路診斷法辨別其故障類型。結果Rogers、IEC、日本電協研、氣體模式診斷及支撐向量機等方法皆能成功辨別故障類型；Dornenburg法雖皆診斷出故障，但每一故障均檢測出2種類型；而Glass法有1個案例診斷錯誤；Laborelec有2個診斷錯誤；徑向機法與倒傳遞網路法則只成功診斷出2個故障類型。

This thesis presents a comparative study of traditional methods and artificial neural network (ANN) for the incipient fault diagnosis of oil-filled power transformer. The traditional diagnosis criterion includes transformer’s fault identification table, gas ratio code, and gas pattern; on the other hand, radial basis function network (RBFN), back-propagation network (BPN), and support vector machine (SVM) algorithms are selected as artificial neural networks. The gas ratio methods consists of Dornenburg, Rogers, IEC, JECR, Glass, and Laborelec etc. All dissolved gas samples were collected from Taipower Power Company, Burea of Kaohsiung Port, and IEC 60599. The research results show that performances of all neural networks methods based on individual gas component concentration are better than gas code method. For the test of unknown input samples, the accuracy of SVM is 97％ and its training time is 56 seconds; the accuracy of RBFN is 93.9％ and its training time is 89 minutes; the accuracy of BPN is 78.8％ and its training time is 19 minutes and 5 seconds. It can been seen that the fault diagnosis accuracy of SVM and RBFN are satisfactory. But RBFN took too much time to obtain the results, it is unacceptable for fast diagnosis of transformer fault. Besides, five dissolved gas are used for the fault diagnosis of field transformers, and these gas are respectively analyzed by different traditional method and ANN method to identify fault type. The results illustrate that Rogers, Doenenburg, IEC, Japanese Electric Institute, Gas pattern, and SVM can successfully detect all fault types; while Doenenburg diagnosed two fault types for each case. But RBFN and BPN methods only identified two faults; one case was wrongly classified by Glass method; two unsuccessful diagnosis happened to Laborelec method.

中文摘要-----------------------------------------------------Ⅰ
英文摘要-----------------------------------------------------Ⅱ
目錄---------------------------------------------------------Ⅳ
圖目錄-------------------------------------------------------Ⅵ
表目錄-------------------------------------------------------Ⅶ
第一章 緒論----------------------------------------1
1.1 研究背景與動機------------------------------1
1.2 國內外相關研究概況--------------------------1
1.3 研究貢獻------------------------------------3
1.4 論文內容概要--------------------------------3
第二章 變壓器故障診斷------------------------------4
2.1 前言----------------------------------------4
2.2 油中溶解氣體分析----------------------------4
2.2.1 油中氣體來源----------------------------------5
2.2.2 氣體層析法----------------------------------5
2.3 故障診斷--------------------------------------6
2.3.1 變壓器異常的判定----------------------------6
2.3.2 傳統診斷法----------------------------------7
2.4 傳統診斷法於實例診斷效能之比較分析----------17
第三章 類神經網路演算法----------------------------23
3.1 簡介----------------------------------------23
3.2 類神經網路類型------------------------------23
3.3 類神經網路運作過程--------------------------24
3.4 類神經網路演算法----------------------------25
3.4.1 徑向基類神經網路----------------------------25
3.4.2 倒傳遞類神經網路----------------------------27
3.4.3 支撐向量機----------------------------------34
第四章 變壓器故障案例診斷--------------------------39
4.1 簡介----------------------------------------39
4.2 不同演算法之性能評估------------------------39
4.2.1 IEC氣體濃度比值診斷法(已知輸入樣本)--------39
4.2.2 IEC氣體濃度比值診斷法(未知輸入樣本)--------42
4.2.3 單獨氣體濃度診斷法(已知輸入樣本)-----------42
4.2.4 單獨氣體濃度診斷法(未知輸入樣本)-----------44
4.3 案例診斷-----------------------------------45
第五章 結論與未來研究方向-------------------------48
5.1 結論---------------------------------------48
5.2 未來研究方向-------------------------------48
參考文獻---------------------------------------------------50

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