• china meter
  • Professional Manufacturer Of Energy meter,Electricity meter,Kilowatt hour meter etc.

Electromechanical meter

    Name:DD450 long life kwh meter

  • Electromechanical meter

  • The DD450 single-phase meter is designed to meet latest IEC62053-21,IEC62052-11. With accuracy of class 2, it measures active energy in single-phase two-wire alternating current power grids. It is a reliable long life meter. The designed service life is 20 yeas and the maximal overload capacity is 800%Ib. The construction of the meter complies with BS5685 and protection class IP53 of IEC30529.
  • Construction
  • Meter case
  • Two types of cases are available One is the insulating case of protective-classⅡ and the other is the weather-proof case complying to IEC60529 and Ip54.
  • Terminal block
  • The terminal block is molded of Bakelite . The voltage test link can be located inside or out-side of the meter case. The maximum diameter of the terminal hole is 8.5mm.
  • Driving element
  • The driving element consists of a voltage element and a current element, both of which are fixed to the frame. The voltage element has a low load adjustment mechanism, and the current element has an inductive load adjustment mechanism.
  • Rotor
  • The rotor shaft is made of aluminum alloy with a small hole in the upper end for storing lubrication and for fitting a brass bearing The worm is turned of brass, and is acid-cleaned or nickel-plated. The worm and shaft can be detached.
  • Braking element
  • The magnet is made of AINiCo5 alloy and designed as U-shaped so that the effect of short-time over current upon the magnet is negligible. The full load error can be fine controlled by adjustment mechanism.
  • Frame
  • The frame is die-casted by high-quality Al alloy of stable property to avoid distortion. The application of static spray-painting on the surface prevents the frame from oxidation.
  • Upper bearing
  • The pin is made of high-quality abrasion-proof stainless steel and is embedded on the brass pin base.
  • Lower bearing
  • Both double jewel bearing and magnetic bearing are available.
  • Register
  • The register adopts heat-and abrasion-proof plastic gears and bearings. No lubrication of bearings is needed during the service life. The drum is made of polycarbonate, printed by UV resistant alumina to ensure non-depigmentation.
  • Technical Parameter
  • 1 Meter type DD450
    2 Applicable Standards IEC60521、BS5685
    3 Accuracy Class 2 (according to IEC60521)
    4 Average service life (MTTF) 20 years
    5 Basic current (lb)   A 5        10         15
    6 Maximum current (Imax)  A 20    30    40    60    80    100
    7 Reference voltage   Un 110V,120V,220V,230V,240V
    8 Reference frequency   fn 50Hz, 60Hz
    9 Power losses in voltage circuit
    at 50Hz Un    		 For over load capacity of 800%lb:1.3W/6VA     
    others:1.0W/5VA
    10 Power losses in current
    circuit at 50Hz   Un  Ib    		 <0.5VA
    11 Non-running with no-load 0.8~1.1Un
    12 Starting current 0.5%lb
    13 Mean temperature change
    Form0.1lb to lmax at unity PF
    Form 0.2lb to lmax at unity 0.5lagging    		   <0.08%/℃
    <0.12%/℃
    14 Insulation level:
    Withstanding A.C. voltage for 50Hz, 1min
    Withstanding impulse voltage 1.2/50us    		   >4kV
    >8kV
    15 Rated load torque at unity PF, lb Over load capacity 800%lb:350uNm
    Over load capacity 400~600%lb:400uNm
    16 Weight of rotor 23.5g
    17 Weight of meter    1.6kg
    18 Main case Bakelite base/PC cover/Bakelite  terminal cover
    19 Register Cyclometer single, unidirectional, Jumping
    20 Option Reverse running stopper
  • Typical connection diagram
  • electromechanical meter
  • Outline & installation size
  • electromechanical meter