FIELD: electrical engineering. SUBSTANCE: procedure is intended for timely control and measurement of quality of electric energy in heavy- and weak-current networks, for development of multifunctional meters of new generation which realize simultaneously functions of metering of energy subject to payment, of control over quality of electric energy with identification of sources distorting quality and quantitative evaluation of distortions. In compliance with invention pickups carry out test measurements of instant phase voltages and currents, conduct their harmonic analysis and resolution of voltages and currents of fundamental harmonic into symmetric components, compute active powers of sequences of fundamental harmonic and of summary power of higher harmonics of phases and coefficients of inverse and zero sequences and distortions of sinusoidal form. Signs and values of components of active power with due account of these coefficients make if feasible to detect source of distortion and to compute paid authorized and unauthorized energy. EFFECT: development of procedure for detection of sources of unauthorized distortion of quality of electric energy with time referencing and its quantitative evaluation. 1 cl
