采用長期實時監測運行中絕緣子污穢泄漏電流的方法來監測變電站絕緣子的污穢程
度。所開發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據采集和處理系統能夠適應泄漏電流的大范圍內變化, 實時監測絕緣子污穢程度, 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, 提高供電系統的可靠性。
關鍵詞: 污穢; 在線監測; 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