FIELD: electrical engineering, relay protection, emergency automatic equipment of power-supply networks. SUBSTANCE: method of determination of frequency of power-supply network is based on measurement of electric signal of network at fixed time moments, on tuning of adaptive filter and on finding of frequency of power-supply network by roots of characteristic equation. There are introduced new operations making it possible to exclude influence of higher harmonics on precision and authenticity of determination of frequency of power-supply network. Invention can be used in digital protection systems for precision determination of frequency. EFFECT: increased precision of method. 3 dwg
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