FIELD: electric measurement engineering.
SUBSTANCE: electricity meter can be used for measuring electric energy in ac circuits. Electricity meter has current detector, current by voltage multiplier, current-to-pulse frequency converter, current transformer provided with two primary windings and rectifier. One primary winding of transformer is connected with phase conductor of measuring circuit, and the other winding - with one zero conductor and with one secondary winding at which winding the signal is proportional to difference in currents of primary windings. Outputs of transformer are connected with current-to-pulse frequency converter through rectifier.
EFFECT: protection against burglary.
1 dwg
