Description

The DD**0 single-phase meter is designed to meet latest IEC****1. 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 *0 yeas and the maximal overload capacity is **0%Ib. The construction of the meter complies with BS***5 and protection class IP*3 of IEC****9. Meter case The meter case complies to the insulating protective-class â…¡. Terminal block The terminal block is molded of heat-and flame-resistant bakelite. It is fixed in the extendedmeter base. The voltage test link can be located inside or outside of the meter case. Driving element The driving element consists of a voltage element and a current element, both of which arefixed on the aluminum alloy frame. It has a load curve compensation device and inductive load adjustment mechanism. Rotor The rotor shaft is turned of high strength aluminum alloy. Bras or plastic worm is also ***** 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 currents upon the magnet is negligible. Frame The frame is die-casted by high-qualiy SiAl alloy of stable property to avoid distortion. A lowload adjustment mechanism which can be manually adjusted is mounted on the frame. Upper bearing The upper bearing consists of a guide pin and a brass sleeve, and is fixed on the meter framewith one screw. Lower bearing The meter uses holistic hard ferrite magnetic bearing unless there is special request from thecustomer. 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, and is pyrographed and printed by UV resistant alumina to ensure non-depigmentation.