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