The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON CIRCUITS AND SYSTEMS
Transactions ID Number: 52-173
Full Name: Ponnuswamy Rajkumar
Position: Professor
Age: ON
Sex: Male
Address: Electrical & Electronics Engineering Dept., Sri Ramakrishna Engineering College, Coimbatore-22
Country: INDIA
Tel: +914222461588
Tel prefix:
Fax:
E-mail address: hod-eee@srec.ac.in
Other E-mails: sparkcsice@rediffmail.com
Title of the Paper: Identification of Impending Interturn Faults in Random Wound Induction Motors Used in Adjustable Speed Drives
Authors as they appear in the Paper: Ponnuswamy Rajkumar, Sudesh Johny, Ebenezer Jeyakumar
Email addresses of all the authors: hod-eee@srec.ac.in, john_plasma@srec.ac.in, ebeyjkumar@rediffmail.com
Number of paper pages: 10
Abstract: Abstract: Diagnosis of stator current has been presented by several authors for identifying various bearing and rotor faults in an induction motor. However, there is very limited literature covering the effect of interturn faults on the stator current pattern. This is due to the reason that the effect of motor interturn insulation faults in the initial stages being not discernible and any changes in the capacitive current components are negligibly very small and of very high frequency content. This paper deals with a simple technique, utilizing the effect of the interturn fault in modifying the high frequency components of the applied pulse width modulated (PWM) voltage. Insulation Resistance (IR) and Polarization Index (PI) are two universally accepted diagnostic tests for insulation tests. The change in insulation strength between the turns affects the capacitive component of the stator line current. Resulting changes in wave shapes of applied voltage have been s!
tudied with respect to both the distance of interturn faults from line end and reduction in the insulation strength; and hence in the insulation resistance value. The studies have been made by computer simulation and validated by experiments. There is ample evidence that an impending and progressing interturn fault can be identified in Adjustable Speed Drives driven by frequency converters by studying line end coil voltage waveforms.
Keywords: Keywords: Repetitive switching surges, stator line current, PWM voltage, adjustable speed drives, motor insulation, interturn faults, high frequency capacitive current components
EXTENSION of the file: .doc
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