臺灣博碩士論文加值系統

模鑄型變壓器所使用的絕緣樹脂材料中，若有空隙或細微雜質殘存，則當變壓器被供電時，在該處將引發部分放電現象。若此放電能量超過該絕緣材料之耐受程度時，將危及變壓器而造成毀損，為預防此現象則需仰賴部分放電偵測技術。英國電機研究協會所訂定之量測漏電荷量的方式，是目前國內普遍使用的方法，此法之靈敏度高，但無法運用於即時偵測。本論文針對音射原理應用於偵測模鑄型變壓器部分放電的技術作探討，經由實測證明，具有即時偵測功能之音射偵測法，不只能適用於油浸式變壓器；更可運用在模鑄型變壓器上。在實驗中更發現，模鑄型變壓器之音射信號存有數百萬赫芝以上未曾被察覺的頻率成份，將可做為更深入研究模鑄型變壓器部分放電的參考。

Defects in the cast-resin dry-type transformer, such as particles or voids, when apply voltage to this transformer will produce partial discharge activity. It will cause degradation in insulated material for transformer when the partial discharge leakage energy reaches to some extent. For the measurement of partial discharge in transformer, Electrical Research Association method is a method to measure the leakage electrical energy. Although the high sensitivity is the merit of this method, it is not well developed for online monitor the performance of cast-resin dry-type transformer. In this thesis, Acoustic Emission technique was proposed to detect the degradation of the cast-resin dry-type transformer. Experimental results show that the method of Acoustic Emission is adequate for online monitor, and can substitute the Electrical Research Association method. From the field test of the Acoustic Emission techniques, the part of high frequency is measured that has never been discussed. It will be able to provide the more information in partial discharge phenomenon of cast-resin dry-type transformer.

目 錄
摘 要 I
誌 謝 III
目 錄 IV
圖 目 錄 VI
表 目 錄 IX
符 號 表 X
第一章 緒論
1.1 研究動機與背景 1
1.2 本論文之貢獻 1
1.3 論文章節概要 2
第二章 音射測量相關技術
2.1 音射簡介 3
2.1.1 音射訊號波形 3
2.1.2 音射檢測技術的優點與缺點 5
2.2 音射訊號的參數 6
2.2.1 音射訊號的參數 6
2.2.2 音射訊號特性分析 7
2.2.3 雜訊的濾除 10
2.3 壓電感測器特性之探討 11
2.3.1 壓電陶瓷[11] 11
2.3.2 壓電係數 13
2.3.3 壓電感測器的等效電路 15
第三章 音射在油浸式變壓器及絕緣樹脂的應用
3.1 簡介 17
3.2 放電過程 17
3.3 音射法在油浸式變壓器上的應用 22
3.3.1 鐵心雜訊測試 26
3.4 音射法在絕緣樹脂的應用 28
第四章 音射部分放電量測
4.1 電流頻譜量測 33
4.2 音射部分放電信號量測 37
4.3 音射和部份放電量測器輸出的電壓信號的比較 43
4.4 音射信號資料的分析 48
第五章 結論與展望
5.1 結論 53
5.2 展望 53
參考文獻 54
作者簡介 57

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