DD28系列單相電能表
DD28 series single phase watt-hours meter
用途Application:
   DD28型單相電度表系感應單相交流有功電度表，適用于頻率為50Hz，單相交流中有功電能的計量。具有體積小、結構設計緊湊、低功耗等特點，其技術指標合GB/T15283-1994標準及IEC521國際標準。
   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/Tand lntermational standard IEC521.
結構特點Structure feature:
  該儀表采用分離式鐵芯結構，軸承具有單寶石、雙寶石、磁推式、磁懸式四種結構，外殼采用鋁、塑料和玻璃三種，基架由優質鋁合金壓鑄而成，具有良好的機械強度。
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 gl.The die-casting frame is alloy aluminum with excellent mechanical strength.
主要技術參數main technical data:
型號Te:DD282  DD283 
（級）Accurocy(cl):2
額定電壓Rated voltage(v):220-240
額定電流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)

過載能力Overl0ad capaciaty:200％Ib  300％Ib 
緣性能Insulation current:
工頻交流電壓2kV 歷時1分鐘，沖擊電壓強6kV
AC voltage 2kV for 1 minute impulse voltage 6kV
外型：
DD28透明塑殼；DD28黑色塑殼；DD28玻璃殼；DD28鋁殼