1 International Journal of Research in Science & Technology Volume: 1 | Issue: 10 | November 2014 | ISSN: 2349-0845 IJRST I. INTRODUCTION Scenario has changed a lot. With the increase of size and capacity, power systems have become complex leading to reduced reliability. But the development of electronics, electrical device and appliances has become more and more sophisticated and they demand uninterrupted and conditioned power. In this ever changing power scenario, quality assurance of electric power has also been affected. It demands a deep research and study on the subject „Electric Power Quality. ‟Institute of Electrical and Electronic Engineers (IEEE) Standard IEEE1100 defines power quality as the concept of powering and grounding sensitive electronic equipment in a manner suitable for the equipment. A simpler definition is stated as below. Power quality is a set of electrical boundaries that allows a piece of equipment to function in its intended manner without significant loss of performance or life expectancy. Electric Power Quality (EPQ) is a term that refers to maintaining the near sinusoidal waveform of power distribution bus voltages and currents at rated magnitude and frequency. Thus EPQ is often used to express voltage quality, current quality, reliability of service, quality of power supply, etc., Fundamental concept identifies the parameters and their degree of variation with respect to their rated magnitude which are the base reason for degradation of quality of electric power. Sources are the regions which causes the unwanted variation of those parameters. Effects of poor quality of power are the effects faced by the system and consumer equipment after the occurrence of different disturbances [1], [2]. In modeling and analysis, attempts are taken to configure the disturbance, its occurrence, sources and effect; mainly based on the mathematical background. For monitoring of EPQ, constant measurement and instrumentation of the electric parameters are necessary. Complete solution, i.e. delivery of pure power to the consumer side is practically impossible. Our target is to minimize the probability of occurrence of disturbances and to reduce the effects of EPQ problems. To ensure uninterrupted Power Quality Disturbances Analysis and Detection using Discrete and Continuous wavelet transforms Vemu Chakrapani 1 , Ch.Durga Prasad 2 and K.Kiran Kumar 3 1 Department of EEE, SRKR Engineering College, Bhimavaram, India 2 Department of EEE, SRKR Engineering College, Bhimavaram, India 3 Department of EEE, SRKR Engineering College, Bhimavaram, India Article Info ABSTRACT Article history: Received Nov 12 th , 2014 Accepted Nov 19 th , 2014 Publication Nov 22 th , 2014 This paper discusses power quality Disturbances analysis and detection using discrete wavelet transform (DWT) and Continuous wavelet transform (CWT). Two power quality disturbances, Sag and Swell is analyzed in this paper. Results are carried out in MATLAB/Simulink Environment. Keyword: Power quality issues, discrete wavelet transform, Continuous wavelet transforms. Copyright © 2014 International Journal of Research in Science & Technology All rights reserved. Corresponding Author: Vemu Chakrapani Department of EEE, SRKR Engineering College, Bhimavaram, India chakrivemu12@gmail.com