Sayli A. Deshmukh. Int. Journal of Engineering Research and Application www.ijera.com ISSN : 2248-9622, Vol. 7, Issue 7, ( Part -4) July 2017, pp.75-79 www.ijera.com DOI: 10.9790/9622-0707047579 75 | Page Detecting Faults Based on Motor Current Signature Analysis for Electric Motor *Sayli A. Deshmukh 1 , A.R.Askhedkar 2 1 M.E. student at Department of Electronics & Telecommunication, MITCOE, Pune 2 Asst. Professor at Department of Electronics & Telecommunication, MITCOE, Pune ABSTRACT Motor electrical current signature analysis (MCSA) is sensing an electrical signal containing current components that are direct by-product of unique rotating flux components. Anomalies in operation of the motor modify harmonic content of motor supply current. Inductions motor drives are the most widely used electrical drive system and typically consume 40 to 50 percent of an industrialized nation’s total generating capacity. Induction motors have applications in the field of transportation, manufacturing, mining, and petrochemical and in almost every other fields dealing with electrical power. So, condition monitoring and fault diagnosis become necessary to monitor the health of the machine. The present paper discusses the fundamentals of Motor Current Signature Analysis and fault detection of the induction motor using MCSA. Keywords: Induction motor; MCSA; Signature Analysis; FFT; Fault Detection I. INTRODUCTION Induction motors are mainly used in industrial drives as they are rugged, reliable and economical. Motor Current Signature Analysis (MCSA) is a condition monitoring technique which helps to find and diagnose problems in induction motors. MCSA is a method from wider field of Electrical Signature Analysis (ESA), useful for analyzing not only electrical induction motors, but also generators, power transformers as well as other electric equipment. Most popular techniques of signature analysis are: Voltage Signature Analysis (VSA), Current Signature Analysis (CSA), Instantaneous Power Signature Analysis (IPSA) and Extended Park’s Vector Approach (EPVA) also includes Motor Circuit Analysis, involving analysis of resistance, impedance, inductance, phase angle, current/frequency response and insulation to ground faults [2]. Critical applications of induction motor are found in all industries and include all motor horsepower. For typical low- to medium-horsepower induction motors many of the commercial products to monitor induction motors are not cost effective. Advances in sensors, architectures and algorithms are the necessary technologies for effective incipient failure detection. For the purpose of failure monitoring, a variety of sensors could be used to collect measurements from an induction motor. These sensors can measure stator voltages and currents, case vibrations, internal and external temperature air-gap, output torque, external magnetic flux densities, rotor position and speed etc. [2]. A. Various types of faults in induction motor There are different types of faults which occur within the three phase induction motor during the course of normal operation. These faults may lead to a potentially catastrophic failure if remain undetected [9]. The common internal faults can be mainly categorized into two groups: 1. Electrical type of faults: The following two major types of electrical faults are very common in three phase induction motor while operating in industries.  Stator fault This type of fault in a symmetrical three phase ac machine cause a large circulating current to flow and leads to generation in the shorted turns. These can be line-to-line fault, Coil-to-coil fault, Open circuit fault, Turn-to-turn fault, and Line-to- ground fault.  Rotor Fault The rotor faults occurs due to several reasons such as,  While manufacturing during breezing process, non-uniform metallurgical stresses may be built into cage assembly and these may also lead to failure during operation.  At start of machine, a rotor bar may be unable to move longitudinally in the slot which it occupies, when the thermal spaces are imposed.  Heavy end ring can result in large centrifugal forces, this can cause dangerous stresses on the bars. RESEARCH ARTICLE OPEN ACCESS