一种三相三线与三相四线自适应电能表的设计

Design of Adaptive Electric Energy Meter Used for 3P3W or 3P4W System

针对传统三相电能表因应用现场接线方式不同,衍生出来多种电压规格的表型,造成电能表厂商的生产和维护成本高、用户使用和管理难度大的问题;该文介绍了一种三相三线与三相四线自适应电能表;该自适应电能表以测量到的三相电压幅值和三相电压间的相角为基础数据,结合电能表的行业标准、技术规范和实际运行环境,形成了一整套的电压规格识别和管理、计量参数调整和显示报警机制,并通过软件程序实现了电能表对三相三线与三相四线两种接线方式下不同电压规格的自适应功能;测试结果表明,所设计的自适应电能表在57.7V、100V和220V三种电压规格下都能准确地测量和计量,完全能满足国家电网公司在《Q/GDW1827—2013三相智能电能表技术规范》中对0.2S级三相智能电能表的技术规范要求,且性价比高,具有广阔的市场前景。

Because of the wiring method is different in application, the normal three phase electric energy meter have many voltage specification types, it causes the manufacturing and maintenance cost of the electric energy meter manufacturer very highly, and it is also difficult for the user to use and manage. In this paper, it describes a three phase electric energy meter which can be adaptive in 3P3W or 3P4W system. The meter used the three phase voltage amplitude and included angle as basic data which measured by itself, and combined with the in dustry standard, technical specification and actual operating environment of the electric energy meter, formed a suit of mechanism which used to recognize and manage the voltage specification, adjust the meter parameters, display and alarm, then used software program to a- chieve the different voltage specification adaptive function. The test result shows that the adaptive electric energy meter can work correctly under the power grid system whose voltage specification is 57. 7 V, 100 V or 220 V. The adaptive electric energy meter can perfectly satisfy the technical specifications requirements of State Grid in the Q/GDW1827-2013 Technical specification for triphase smart electricity meters for the class-0. 2 S three phase electric energy meter, it has high quality-price ratio, and broad market prospects.