【正文】
的 紅外熱像儀具有較高的性價比 也是本課題需要注意的 ,也是決定本課題所設(shè)計的監(jiān)測系統(tǒng) 后續(xù)能 否進行推廣的 重要因素。 4) 根據(jù)本系統(tǒng)采集的紅外熱像 性噪比高,但 對比度低、圖像細節(jié)比較模糊 的特點 ,擬 先 對熱像進行銳化 , 增強圖像的細節(jié),然后對采集的黑白圖像進行偽彩色增強, 使 最終在主界面上顯示的 熱像具有 較好的 視覺效果。根據(jù)對 以往 該變電站變壓器故障原因的總結(jié),在變壓器存在潛在故障時,首先出現(xiàn)明顯溫升的是圖 中標注的高壓側(cè)和中壓 側(cè) 的三相接 頭, 本課題的 主要 目的 是通過這六個接頭的溫度和一些輔助區(qū)域溫度來判斷變壓器的運行情況,發(fā)現(xiàn)潛在 隱患 ,從而提前做出預(yù)警 ,及時檢修 。用紅外檢測技術(shù)對電力診斷具有如下優(yōu)點:1 緒論 碩士論文 4 診斷效率高、判斷準確、圖像直觀、安全可靠、非接觸探測、不受電磁干擾、探測距離遠、探測速度快以及可以進行在線檢測等。但是,預(yù)防性維修需要停電檢修,影響了供電的可靠性;定期檢修中更換的設(shè)備 有些 是沒有必要更換的,降低了經(jīng)濟性;試驗條件 有可能 不同于變壓器的實際運行條件,試驗結(jié)果不能及時、準確再現(xiàn)絕緣缺陷和潛在故障。 目前, 國外比較知名的大電力公司都已將紅外診斷技術(shù)廣泛運用于電力系統(tǒng)運行狀況的檢修,并取得了較好的效果 [9]。采用定期檢修方式使很多設(shè)備存在過修或失修的問題, 不僅 造成巨大的資源浪費 ,而且埋下了 安全 隱患 。 紅外檢測技術(shù)是 ―九五 ‖國家科技成果重點推廣項目, 是實現(xiàn)我國電力系統(tǒng) 從計劃 檢修 向預(yù)知狀態(tài)檢修 改革的重要 手段 ,本課題的 最終目的就是利用 紅外 熱像儀對 某市 供電局的 110KV 的 變壓器實施 24 小時不間斷在線監(jiān)測,利用熱像儀采集的數(shù)據(jù)實施智能化超溫報警,并 將數(shù)據(jù)上傳至遠程服務(wù)器,實現(xiàn)對該變電站的遠程監(jiān)控。 II 聲 明 本學(xué)位論文是我在導(dǎo)師的指導(dǎo)下取得的研究成果,盡我所知,在 本學(xué)位論文中,除了加以標注和致謝的部分外,不包含其他人已經(jīng)發(fā)表或公布過的研究成果,也不包含我為獲得任何教育機構(gòu)的學(xué)位或?qū)W歷而使用過的材料。 關(guān)鍵詞 : 電力變壓器 , 紅外熱像儀 , 在線監(jiān)測 Abstract 碩士論文 II Abstract Power transformer in a converting station is a key equipment of the electrical power system, as we know power transformer may has some potential fault, the traditional method is using some wokers to check the equipment constantly, but this method is too timeconsuming and laborious. Nowadays in the electric utility industry the method used on a large scale is online monitoring technology. This new method not only saves a lot of manpower and resources, but also enables the maintainance of the power transformer to get better results. The ultimate goal of this project is to use thermal infrared imager to implement a 24hour uninterrupted online monitoring on a 110 kv system uses the data collected by thermal infrared imager to realize intelligent temperature alarm, and upload the data to a remote server. This topic firstly analyzes the factors that influence the temperature measurement accuracy of thermal infrared imager, then do some reserch on the operating environment of the power transformer to choose the thermal infrared imager that fit for our system, finally use the SDK which is consistent with the thermal infrared imager to develop the backstage monitoring software system. The main research work for the software of this system are as follows: 1) According to the operational status of power transformer, choose the best online monitoring mode, and design the capturing process on the basis of the install position of the thermal infrared imager and the monitoring distance of the device. 2) According to the characteristics of the infrared image, choose the right image processing algorithm for the image preprocessing so that the infrared image can get the best visual effect. 3) Select the appropriate database based on this system, design the proper data storage structure to facilitate the system to store and query data from the database. 4) Design the right algorithm for infrared diagnosis on the basis of the latest diagnostic norms of infrared diagnosis so that the system can use the temperature data capturing by the thermal infrared imager to aquire the running state of the power transformer. 5) According to the existing work structure of the power supply bureau, select the right transport protocols and transport process to ensure that realtime data can be uploaded to the monitoring center quickly so that the electrician can get the running state of the device. Key word: power transformer, thermal infrared imager, online monitoring II 碩士論文 基于紅外測溫技術(shù)的電力變壓器過熱故障在線監(jiān)測系統(tǒng)的設(shè)計與開發(fā) III 目 錄 摘 要 ........................................................................................................ I Abstract ........................................................................................................II 1 緒論 .......................................................................................................... 1 引言 .............................................................................................................................. 1 電力系統(tǒng)紅外診斷技術(shù)的國內(nèi)外研究與應(yīng)用現(xiàn)狀 .................................................. 1 國外研究與應(yīng)用現(xiàn)狀 ........................................................................................ 2 國內(nèi)研究與應(yīng)用現(xiàn)狀 ........................................................................................ 2 變壓器傳統(tǒng)在線監(jiān)測方法簡介 .................................................................................. 2 變壓器紅外在線監(jiān)測的目的和意義 .......................................................................... 3 課題研究的主要內(nèi)容 .................................................................................................. 4 2 紅外熱像儀的選擇和使用 ......................................................................... 7 紅外熱像儀的工作原理 .............................................................................................. 7 紅外輻射原理 .................................................................................................... 7 紅外點測溫原理 ................................................................................................ 8 紅外熱像儀的系統(tǒng)組成 .................................................................................... 9 紅外熱像儀技術(shù)性能指標 ........................................................................................ 10 影響紅外熱像儀測溫的因素及相關(guān)對策 ................................................................ 12 熱像儀選擇基本原則 ................................................................................................ 13 系統(tǒng)熱像儀的選擇 .................................................................................................... 13 本章小結(jié) .................................................................................................................