FIELD: electrical engineering, measurement of electric energy consumption. SUBSTANCE: system and way refer to determination of loss of reference voltage which indicates potential unauthorized intervention into operation of double-element electronic meter that incorporates processor establishing electric power by signals of current and voltage and display presenting operational condition of meter. Difference of phase angle between two phases is measured to determine possible loss of reference voltage of meter in three-wire network before and after network mounting. If phase difference is equal to predetermined value than display of counter indicates loss of reference voltage and possible intervention into operation of meter. Apart from this system can be tailored for determination of time segment during which this state occurred to inform proper power suppliers and agencies which make out bills. EFFECT: enhanced functional reliability. 21 cl, 15 dwg, 1 tbl
