FIELD: electricity.
SUBSTANCE: invention is attributed to the field of instrument engineering and can be used for electric drive effective power monitoring. To achieve technical result two current transformers with compensation windings are introduced. In this circuit primary windings are included into two lines of three-phase supply mains. Secondary windings of current transformers are connected to current inputs of electronic system wattmeter. Each of the compensation windings is connected by one of its terminal to secondary winding of reducing voltage transformer and by the other terminal - to adjustable resistor associated with this transformer. Primary windings of reducing voltage transformers are connected to those lines of three-phase supply mains into which primary windings of current transformers are included.
EFFECT: separation of useful power consumption from overall power of all kinds of losses.
2 cl, 1 dwg
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