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The integration method for amplitude estimation of fundamental frequency signal, using appropriate integration interval, can be used when measuring signal is composed of fundamental and high harmonics of order 2n or fundamental and high harmonics of order 3n, n=1,2,3.... It is not possible to find the integration interval to get the integration method which is simultaneous immune to high harmonics of order 2n, 3n, 5n etc.. In this paper, the integration method is modified to get the method which is simultaneous immune to high harmonics of order 2n, 3n and 5n, n=1,2,3.... The obtained method is tested at miscellaneous form of measuring signals using Matlab

Modified integration method for amplitude estimation of fundamental frequency measuring signal for power system protection