FIELD: electricity.
SUBSTANCE: invention can be used in electrical engineering. According to the invention, measured current or voltage values are converted to vector values consisting of quadrature component on an observation interval which is equal to or is a multiple of the period of industrial frequency, and conversion of the measured current (voltage) values is carried out with a set of N multipliers, N adders and N delay elements, where N is a given bit capacity of the digital filter, connected to enable realisation of one of real transformations: Hartley, sine and cosine, performed with subsequent conversion of the real transformation result into quadrature components of vector values.
EFFECT: simple method of filtering industrial frequency signals.
2 tbl, 8 dwg
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