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

摘要： 设计并开发泄漏检测系统，该系统可以实时监测长输管道的运行状况。该系统主要包括3大模块：多源信息获取模块，数据存储与查询模块以及泄漏分析与诊断模块。通过OPC技术实时快速获取现场PLC信息，弥补SCADA系统采样频率低导致信息缺失的不足；利用BLOB格式存储大容量实时数据 ,并实现历史数据查询功能；应用投影降噪理论进行信号降噪，实现小泄漏特征信号获取；结合相关分析技术计算负压波传输时间差，并动态求解负压波波速。现场试验证明，该系统具有较高的定位精度，满足现场需求。

关键词: 长输管道 , 泄漏检测 , OPC , BLOB , 投影降噪