M Mohit Reddy 01 01 The paper proposes an improved approach to locating and categorizing harmonic signals in the powerdistribution by means of using spectrograms and timefrequency distribution TFD analysis Spectrogramoccasionally referred to as temporal frequency representation TFR is an appropriate means of presenting signalsin the joint timefrequency domain Since the property of signals is recorded as the result of TFR it can simply locatethe detection and approximated information about the signals in the spectrum The application of a rule basedclassifier and a set of thresholds referred to in the IEEE Standard is used to identify and categorize 200 individualsignals with a range of harmonic features The recommended approach is examined with the help of MAPE and theoutcomes suggest that the method is accurate Moreover the spectrogram is able to give hundred percentclassification of harmonic signals The proposed method to detect and classified harmonic signals in the distributionsystem has been proved to be accurate fast and cost effective Copyright (c) Journal of Engineering Technology and Sciences. All rights reserved 2026