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DD17 single -phase watt-hour meter is induction meter which is applicable to measure the rated frequency 50HZ~60HZ and power loss in electrified wire netting. All technical targets are completely conformed  to National Standard GB/T 15283-94 and International Standard IEC 521

DT8 series three-phase watt-hour meter are induction meters which are applicable to measure active energy and reactive energy electric energy consumption in a rated frequency 50Hz~60HZ and three phase AC alternating electrified net. The active energy meter are completely conformed to National Standard GB/T1 5283-94 and Intermational Standard IEC521. All technical targets of reactive energy meter are completely conformed to National Standard GB/T1 5282-94 and Intermational Standard IEC145.