关键词: 长输管道 , 泄漏检测 , OPC , BLOB , 投影降噪

Abstract: The designed and developed leakage detection system was used to monitor the long－distance pipeline operation condition．This system is mainly composed of three modules including multi－sources information acquisition module，data
storage and query module，leakage analysis and diagnosis module．The OPC technology was applied to real－timely and quickly acquire the field PLC information，which can resolve the information missing problem resulted by the low－frequency SCADA system．The data was stored with BLOB format，and the query function was also realized．Projective algorithm was used for de－noising to get the weak leakage feature signals．Furthermore，the time difference of negative pressure wave transmission was calculated by correlation analysis as well as its velocity was solved dynamically．Field tests indicate that this system can meet the field requirement with high location precision．

Key words: Long－distance pipeline , Leakage detection , OPC , BLOB , Projective algorithm , Correlation analysis