采用長期實時監(jiān)測運行中絕緣子污穢泄漏電流的方法來監(jiān)測變電站絕緣子的污穢程
度。所開發(fā)的泄漏電流傳感器頻帶寬度為150 kHz, 且在100～ 5×105 LA 范圍內具有足夠的線性度; 基于工控機的高速數(shù)據(jù)采集和處理系統(tǒng)能夠適應泄漏電流的大范圍內變化, 實時監(jiān)測絕緣子污穢程度, 當絕緣子污穢過度時能夠及時報警, 從而可以減小變電污閃的幾率, 提高供電系統(tǒng)的可靠性。
關鍵詞: 污穢; 在線監(jiān)測; 泄漏電流; 閃絡脈沖; 污閃
Abstract: The con tam inat ion degree of in su lato rs in sub stat ion is mon ito red by long2term real2t im e detect ing of the leakage cu rren t of in su lato rs in th is paper. The leakage cu rren t sen so r is developed to have enough linearity in the range f rom 100 LA to 5×105 LA and to po ssess 150 kHz bandw idth. The h igh2speed data acqu isit ion system based on indu st rial PC is adap t ive to leakage cu rren t variat ion in a w ide range. The system can accu rately p re2 dict the degree of con tam inat ion on the in su lato r in t im e. W hen the con tam inat ion degree is above the lim it, it w ill give alarm signal, thu s decreasing the p robab ility of f lashover in sub stat ion and imp roving the reliab ility of pow er supp ly system.
Key words: con tam inan t; on line detect ing; leakage cu rren t; arcing pu lse; con tam inan t
f lashover