Application D8 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 and three phase AC altemating electrified net. The active energy meter are completely conformed to National Standard GB/T15283-94 and Intermational Standard IEC521. All technical targets of reactive energy meter are completely conformed to National Standard GB/T15282-94 and Intermational Standard IEC145.