The essential voltage, modern, and segment perspective are required for a wide variety of electricity system programs. An algorithm this is able to calculating or estimating those portions In real time, in the presence of distorted waveforms, reveals application in numerous areas of energy structures. Strategies to hit upon voltage Sag encompass the root imply square (rms), fourier rework, and Height voltage detection techniques. The hassle with those techniques Is they use a windowing method and might therefore be too Slow when carried out to discover voltage sags for mitigation since they Use historic facts. Latest work within the area of sign processing has Led to an algorithm that can extract a nonstationary sinusoidal signal out of a given multi-aspect input signal. The algorithm is able to estimating the amplitude, segment and frequency. On this paper, the algorithm is as compared to existing techniques of sag Detection.