DD28系列单相电能表DD28 series single phase watt-hours meter用途Application: DD28型单相电度表系感应单相交流有功电度表，适用于频率为50Hz，单相交流电网中有功电能的计量。具有体积小、结构设计紧凑、低功耗等特点，其技术指标完全符合GB/T15283-1994国家标准及IEC521国际标准。 DD28 single-phase watt-hour meter is a kind of induction meter.which is applicable to measure the rated frequency 50Hz and power loss in electrified wire netting.All technical targets are completely conformed to National standard GB/T15283-1994 and lntermational standard IEC521.结构特点Structure feature: 该仪表采用分离式铁芯结构，轴承具有单宝石、双宝石、磁推式、磁悬式四种结构，外壳采用铝、塑料和玻璃三种，基架由优质铝合金压铸而成，具有良好的机械强度。The meter has separable electromagnet and the bearing has four kinds;single-jewel,magnetic thrust and magnetic floating.The case has three kinds;aluminum,plastic and glass.The die-casting frame is alloy aluminum with excellent mechanical strength.主要技术参数main technical data:型号Type:DD282 DD283 DD284精度（级）Accurocy(class):2额定电压Rated voltage(v):220-240额定电流Rated current(A):DD282:2(4),2.5(5),3(6),5(10),10(20),20(40),30(60),40(80) DD283:2(6),3(9),5(15),10(30),15(45),20(60),30(90)DD284:5(20),3(12),10(40),15(60),20(80)过载能力Overl0ad capaciaty:200％Ib 300％Ib 400％Ib绝缘性能Insulation current:工频交流电压2kV 历时1分钟，冲击电压强6kVAC voltage 2kV for 1 minute impulse voltage 6kV外型：DD28透明塑壳；DD28黑色塑壳；DD28玻璃壳；DD28铝壳