PROCEDURE MEASURING ELECTRIC ENERGY IN TWO-WIRE NETWORKS WITH PROTECTION AGAINST TAMPERING AND FACILITY FOR ITS REALIZATION Russian patent published in 2003 - IPC

FIELD: electrical engineering. SUBSTANCE: procedure measuring electric energy in A C networks is meant for commercial accounting and detection of facts of tampering with electric energy. Procedure includes formation of signals of instantaneous power of currents in neutral wire and currents of phase wire measured before and after lead-in of feeding line into building, mathematical processing of these signals, comparison of values of obtained signals. To compute consumed electric energy largest of them is chosen and relationship of values of all obtained signals is used to make decision on method of tampering. Facility for realization of procedure has current pickup of neutral wire which output is connected to first input of first multiplier, current pickup of phase wire which output is connected to first input of second multiplier. Second inputs of first and second multipliers are connected to output of voltage pickup and outputs of multipliers are connected to proper inputs of unit for mathematical processing of signals of pickups. Facility also has current pickup of phase wire placed in phase wire before lead-in of two-wire feeding line into building and additional multiplier. Output of additional current pickup of phase wire is connected to first input of additional multiplier whose second input is connected to output of voltage pickup, output of additional multiplier is connected to corresponding input of unit for mathematical processing of signals of pickups which outputs are connected to indicator of measurement results and unit of remote transmission of information. EFFECT: improved protection of results of measurement of consumed electric energy. 5 cl, 2 dwg, 1 tbl