导　　师： 屠幼萍;宣晓华

学科专业： 0808

授予学位： 硕士

作　　者： ;

机构地区： 华北电力大学

摘　　要： 高压电容型设备在电力系统中占有重要的地位,对其绝缘进行在线监测对电力系统的稳定运行有着很大的必要性和实用性。论文根据杭州萧山某变电站的现场需求,设计了电容型设备介损在线监测系统。该系统采用分层分布式现场总线的结构,选择了温度、湿度和电流传感器,采用单片机设计了分布式信号采集系统,实现了参数的设置。 采用DELPHI7开发了数据管理系统的功能模块,后台的数据库采用微软的SQLserver2000,建立了变电站数据管理所需的数据表。采用ADO connection组件实现了功能模块与后台数据库的连接,而ADO query组件实现了数据库的插入、删除、修改等操作,在实现系统功能的同时,也兼顾了系统人机界面友好,操作方便的人性化设计。 针对传统的基波相位分离法存在栅栏效应和频谱泄露的不足,采用了加窗的方法进行算法改进。并对现场的数据进行了MATLAB数字仿真,对比结果表明,改进后的方法在信号的基波频率稳定性及介损角计算的准确度上具有优势。 Capacitance type equipment occupies an important position in high voltage substations. Therefore, the online monitoring of capacitance type equipment insulation is of major importance for the stable operation of the power system. Paper see dielectric loss as a target quantity choice on the parameters of on-line monitoring and made the following jobs,adopt hierarchical structure of fieldbus, according to site requirements, chose temperature, humidity and current sensor and achieve the parameter setting, as to interference, using both hardware and software anti-jamming, on block system also achieved good effect. Using DELPHI7to make main interface and realize all data module development, using MS Access of Microsoft as the background of database, a scene of the hydropower station, the data table needed at the front desk and backend database connection, ADOconnection components, inquires by using a function, the main interface ADOquery programming, and realized the perfect combination, the user need only in the main interface button control operation, to avoid the background data from direct control data sheets and brings redundancy. For traditional base wave phase separation exist fence effect and spectrum leaked shortage, adopted the thoughts, and add window to the scene data, the digital simulation of MATLAB, obtained contrast figure, which demonstrates that the improved method compared with the original method has advantages.

关 键 词： 电容型设备 介损 在线监测 现场总线 改进的基波相位分离法

分 类 号： [TM835]

领　　域： [电气工程]