JJF(新)107-2023新疆维吾尔自治区地方计量技术规范JJF(新)107-2023工频大电流发生器校准规范CalibrationSpecificationforPowerFrequencyHighCurrentGenerators2023-12-18发布2024-6-18实施新疆维吾尔自治区市场监督管理局发布JJF(新)107-2023工频大电流发生器校准规范CalibrationSpecificationforPowerFrequencyHighCurrentGenerators归口单位:新疆维吾尔自治区市场监督管理局主要起草单位:新疆维吾尔自治区计量测试研究院参加起草单位:国网新疆电力有限公司电力科学研究院本规范委托新疆维吾尔自治区电磁计量技术委员会负责解释JJF(新)107—2023JJF(新)107-2023本规范主要起草人:史鹏飞(新疆维吾尔自治区计量测试研究院)王晓文(新疆维吾尔自治区计量测试研究院)杨艳霞(新疆维吾尔自治区市场监督审核评价中心)参加起草人:刘卫新(国网新疆电力有限公司电力科学研究院)路东亮(新疆维吾尔自治区计量测试研究院)潘霞(国网新疆电力有限公司电力科学研究院)陈文涛(国网新疆电力有限公司电力科学研究院)JJF(新)107-2023I目录引言························································································(II)1范围························································································(1)2引用文件··················································································(1)3术语························································································(1)4概述························································································(1)5计量特性··················································································(2)5.1电流示值误差··········································································(2)5.2短时间稳定度··········································································(2)6校准条件··················································································(2)6.1环境条件················································································(2)6.2校准所用测量标准及设备···························································(3)7校准项目和校准方法···································································(3)7.1校准项目················································································(3)7.2校准方法················································································(3)8校准结果··················································································(5)9复校时间间隔············································································(5)附录A原始记录参考格式·····························································(6)附录B校准证书内页格式·····························································(7)附录C电流校准结果不确定度评定·················································(8)JJF(新)107-2023II引言JJF1001-2011《通用计量术语及定义》、JJF1071-2010《国家计量校准规范编写规则》和JJF1059.1-2012《测量不确定度评定与表示》共同构成本规范制订的基础性系列规范。本规范为首次发布。JJF(新)107-20231工频大电流发生器校准规范1范围本规范适用于新制造、使用中和修理后的最大输出电流不大于10kA的工频大电流发生器的校准。2引用文件GB/T16927.4-2014高电压和大电流试验技术第4部分:试验电流和测量系统的定义和要求GJB8816-2015交流标准大电流源检定规程凡是注明日期的引用文件,仅注日期的版本适用于本规范;凡是不注日期的引用文件,其最新版本(包括所有的修改单)适用于本规范。3术语下列术语适用于本规范。工频大电流发生器powerfrequencyhighcurrentgenerator一种能产生工频大电流的电气试验装置,其输出电流的大小可以调节,输出电流的时长可以控制。4概述工频大电流发生器是能够输出交流大电流,用于对各种开关、电流互感器等电器设备做电流负载试验及温升试验的装置,工频大电流发生器原理如图1所示。其实质上是一种双绕组降压变压器。当一次侧绕组上加上电压时,流过电流在铁芯中就产生交变磁通,这些磁通称为主磁通,主磁通会穿过一次、二次绕组,绕组内会产生感应电动势,这时如果二次侧接入负载,便会产生电流。JJF(新)107-20232图1工频大电流发生器工作原理图5计量特性5.1电流示值误差5.1.1数显式工频大电流发生器电流测量最大允许误差:±3%。5.1.2指针式工频大电流发生器电流测量最大允许误差:±5%。5.2短时间稳定度输出电流的短时间稳定度一般不超过其最大允许误差绝对值的1/5。注:以上指标不适用于合格性判别,仅供参考。6校准条件6.1环境条件6.1.1环境温度:20℃±5℃;6.1.2环境相对湿度:20%~80%;6.1.3电源电压:220V±22V或380V±38V;6.1.4电源频率:50Hz±0.5Hz;6.1.5电源总谐波失真:≤5%。6.1.6校准场所没有可察觉的振动和影响仪器正常工作的电磁干扰。JJF(新)107-202336.2校准所用测量标准及设备6.2.1电流互感器电流互感器的测量范围应覆盖被校设备的电流范围,准确度等级不低于0.1级。6.2.2标准交流电流表标准交流电流表的测量范围应覆盖前述电流互感器的输出电流范围,其最大允许误差≤±0.5%。6.2.3钳形电流表钳形电流表的测量范围应覆盖被校设备的电流范围,准确度等级不低于被校准设备的1/3。7校准项目和校准方法7.1校准项目校准项目见表1。表1校准项目序号校准项目1电流示值误差2短时间稳定度7.2校准方法7.2.1外观及工作正常性检查a)工频大电流发生器外观应完好,铭牌上应明确标出产品名称、制造厂、型号、出厂编号、制造日期、额定工作电压等,所有标志清晰明确。b)各种调节旋钮、按键灵活可靠,显示笔画应完整无缺。c)工频大电流发生器控制箱及升流装置金属外壳均应有明显的接地端子。有关接地的要求,制造厂应在技术说明书中明确说明。7.2.2输出电流校准方式一:使用电流互感器和标准交流电流表的组合进行电流示值误差的校准,如图2所示。JJF(新)107-20234图2方式一电流示值误差校准原理图方式二:使用钳形电流表进行电流示值误差的校准,如图3所示。图3方式二电流示值误差校准原理图对于数显式工频大电流发生器,每个量程至少应选取20%、40%、60%、80%和100%,5个点进行校准,也可根据用户的需求增加校准点。对于指针式工频大电流发生器,可以根据指针表盘上的刻度线自行选择校准点,一般选取不少于4个点。启动被测仪器,缓慢升高输出电流至校准点,待输出电流基本稳定后同时读取被测仪器的示值和标准器的标准值。电流示值误差按照式(1)进行计算:xsIsIII(1)式中:I—被测工频大电流发生器误差;IX—被测工频大电流发生器示值,A;IS—标准电流值,A。7.2.3短时间稳定度校准原理如图2。将工频大电流发生器升流至额定电流的50%以上,记录此时标准交流电流表的电流值,被校仪器连续运行10min,期间每隔1min记录1次电流值,短时间稳定度按式(2)计算:maxmin100%tIIRI(2)式中:��——电流输出的短时间稳定度,%;Imax——时间段内实测电流最大值,A;Imin——时间段内实测电流最小值,A;� ——时间段内实测电流的算术平均值,A。JJF(新)107-202358校准结果工频大电流发生器校准后,出具校准证书。校准证书至少应包含以下信息:a)标题:“校准证书”;b)实验室名称和地址;c)进行校准的地点(如果与实验室的地址不同);d)证书的唯一性标识(如编号),每页及总页数的标识;e)客户的名称和地址;f)被校对象的描述和明确标识;g)进行校准的日期,如果与校准结果的有效性和应用有关时,应说明被校对象的接收日期;h)如果与校准结果的有效性应用有关时,应对被校样品的抽样程序进行说明;i)校准所依据的技术规范的标识,包括名称及代号;j)本次校准所用测量标准的溯源性及有效性说明;k)校准环境的描述;l)校准结果及其测量不确定度的说明;m)对校准规范的偏离的说明;n)校准证书签发人的签名、职务或等效标识;o)校准结果仅对被校对象有效的说明;p)未经实验室书面批准,不得部分复制证书的声明。9复校时间间隔仪器复校时间间隔,建议不超过1年。如果仪器经维修、更换重要部件或对仪器性能有怀疑时,应随时校准。JJF(新)107-20236附录A原始记录参考格式第1页,共2页委托单位:类型:出厂编号:规格/型号:生产厂家:主要测量设备:测量范围:扩展不确定度:设备编号:证书编号:有效期至:环境温度:℃环境湿度:%RH校准:核验:校准地点:校准项目及结果A.1外观及工作正常性检查A.2电流示值误差标准值/A显示值/A相对误差/%不确定度k=2A.3短时间稳定度次数时间/min电流值/ARt/%不确定度,k=21...10JJF(新)107-20237附录B校准证书内页格式B.1外观及工作正常性检查B.2电流示值误差标准值/A显示值/A相对误差/%不确定度k=2B.3短时间稳定度输出电流/A时长/minRt/%不确定度,k=2JJF(新)107-20238附录C电流校准结果不确定度评定C.1概述C.1.1测量依据:JJF(新)107-2023《工频大电流发生器校准规范》。C.1.2环境条件:环境:20℃±5℃,相对湿度:20%~80%。C.1.3测量标准:电流互感器(15000)A/5A,准确度等级:0.1级,数字多用表8508AACI:(0~2)A,量程最大允许误差为±3.