瓦秒法检查单相电能表存在的误区及对策 .pdfVIP

学兔兔 第47卷 第7A期 电测与仪表 、{o1．47N0I 2010年7月 Electrical Measurement＆ Instrumentation JIlI．2O10 瓦秒法检查单相电能表存在的误区及对策 祝小红 (武汉电力职业技术学院，武汉430079) 摘要：针对基层供电公司采用瓦秒法现场检验单相电能表运行状况存在自带负载功率过小、接线错误及误解瓦 秒法的检测结果含义等问题。本文在介绍瓦秒法原理的基础上，根据《电能计量装置技术管理规程》提出了自带 负载的电流必须大于电能表标定电流的5％的建议；分析了自带负载各种接线方式的实质，得出自带负载必须接 在电能表出线侧的结论；指出瓦秒法检测结果只反映电能表本身的运行误差，而不能反映电能表的接线误差。 关键词：瓦秒法；自带负载；接线方式；电能表误差；接线误差 中图分类号：TM933．4 文献标识码：B 文章编号：1001—1390(2010)7A一0098—04 The Existing Misunderstandings in Watt-second Method for Single——phase Electric Meter Checking and Its Countermeasures ZHU Xiao-hong (Wuhan Electric Power Technical College，Wuhan 430079，China) Abstract：AimingattheproblemsofWatt-secondmethodisusedincheckingtheconditionofasingle-phaseelectricmeteron spotbythegrass-rootscompaniesofpowersupply．It’sshownbelow,theself-takingpowerloadusedistoothin,itswiringmodeis wron5ortendstoamistakenconclusionfromthecheckingresuhsofWatt-secondmethod,andsoon．Thispaperfirstlyintroduced principlesofWatt-secondmethod,thenproposedthesuggestionsthatthecurrentofself-takingloadmustbe5％greaterthanthe calibrating current ofthe meter based on the technical management rules for electric energy metering device Thirdly,the paper came to a conclusion that self-taking load must be linked to the outlet side ofthe meter,after analyzing the substances ofvarious kindsofself-taking-loadwiringmodes,andlastly,poir~ed out that the results from Watt-second method only reflect