Measurement of Power Quality Disturbances in Various Electrical Loads and its Analysis Using Wavelet Transform

The capability of energy being endowed to electrical equipment is ascribed as power quality. The efficiency of the electrical equipment is affected due to power quality issues which includes harmonics in electrical equipment, reduced power factor, instability in the voltages and imbalance. In recent years the power quality issues are caused due to increased use of electronics and non-linear loads. So, measurement and analysis of PQ issues are necessary for improvement of the quality of the electrical power. This work projects the measurement & identification of PQ problems in the electrical loads such as voltage swell, sag, harmonics etc. and analysis using Wavelet transform (WT) tool. The advantages of wavelet transform are that using this tool the frequency of the signal can be analyzed with respect to time simultaneously. The measurement of PQ issues is demonstrated on practical 34 node Indian test feeder with variable electrical loads using Fluke 435 Series II (Power Quality analyzer). Intuition of this paper is to measure quality of different electrical loads and to analyze variations using wavelet transform. This technique is used to resolve the impact of PQ issues by time & frequency analysis.