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。 dd28single-phase watt-hour meter is a kind of induction meter.which isapplicable to measure the rated frequency 50hz and power loss inelectrified wire netting.all technical targets are completelyconformed to national standard gb/t15283-1994 and lntermationalstandard 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 separableelectromagnet and the bearing has four kinds;single-jewel,magneticthrust and magnetic floating.the case has threekinds;aluminum,plastic and glass.the die-casting frame is alloyaluminum with excellent mechanical strength. 主要技术参数main technicaldata: 型号type:dd282 dd283 dd284 精度（级）accurocy(class):2 额定电压ratedvoltage(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overl0adcapaciaty: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6kv ac 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