Journal ArticleDOI
Experience with on-line partial discharge measurement in high voltage inverter fed motors
Greg C. Stone,Howard Sedding,Connor Chan +2 more
- Vol. 54, Iss: 1, pp 866-872
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TLDR
In this article, the stator winding failure mechanisms which produce PD, including the insulation problems that voltage-source, pulse width modulation (VS-PWM) drives can accelerate, are discussed.Abstract:
Partial discharge (PD) testing has long been an important tool for assessing the condition of the high voltage insulation in motor and generator stator windings. In the past several years, many motors have been powered from inverters which facilitate variable speed motor operation. The most common drive used today is the voltage-source, pulse width modulation (VS-PWM) type. VS-PWM drives rated up to 13.8 kV are becoming more common in natural gas processing plants, as well as in other petrochemical facilities. Such drives generate high voltage impulses in the kV range with risetimes in the sub-microsecond range. These impulses are a form of severe electrical interference that can make the on-line detection of partial discharge (with magnitudes 1000 times smaller) difficult due to the overlapping frequency content in PD and in the impulses. Thus, PD detection on medium voltage VS-PWM systems has been a challenge in spite of the serious stator winding insulation aging that such drives may cause to these motors. This paper discusses the stator winding failure mechanisms which produce PD, including the insulation problems that VS-PWM drives can accelerate. A research project that lasted several years is reviewed. It culminated in a prototype on-line PD monitoring system suitable for motors fed by VS-PWM drives.read more
Citations
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Journal ArticleDOI
Reliable Detection of Stator Interturn Faults of Very Low Severity Level in Induction Motors
TL;DR: The article studies induction motors with incipient interturn fault severity with many well-known techniques and proposes a novel method that relies on the monitoring of the stray flux at three positions of the machine, which may be adopted in industry.
Journal ArticleDOI
Noise Rejection and Detection of Partial Discharges Under Repetitive Impulse Supply Voltage
TL;DR: This paper investigates methods to detect PD pulses on enameled wires under repetitive impulsive voltages with different rise times of 60, 500, and 1000 ns, proposing techniques which allow separation of PD from noise even when they overlap in time and frequency domains.
Journal ArticleDOI
Novel Diagnostic Techniques for Rotating Electrical Machines—A Review
TL;DR: The review considers both the techniques currently applied on field for the diagnostics of the electrical machines and the novel methodologies recently proposed by the researchers in the literature.
Journal ArticleDOI
Partial Discharges in Motor Fed by Inverter: From Detection to Winding Configuration
TL;DR: It is shown that a representative insulation system performance picture could be drawn experimentally and used to enhance insulation design and manufacturing choices and to demonstrate the feasibility of PD test of the insulation system on a different type of motor under such conditions, both electrically and environmentally.
Journal ArticleDOI
Design of Archimedes Spiral Antenna to Optimize for Partial Discharge Detection of Inverter Fed Motor Insulation
TL;DR: The design of antenna with optimized geometry and satisfied parameters to detect PD for impulsive voltage is reported and the influence of both impulse voltage parameters and test configuration on PD features are discussed.
References
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Book
Electric Motors and Drives: Fundamentals, Types and Applications
TL;DR: Inverter-fed induction motor drives Stepping motors Synchronous, brushless DC and switched reluctance drives Motor/drive selection Appendix - Introduction to closed-loop control Index as mentioned in this paper
Journal ArticleDOI
Partial discharge signal interpretation for generator diagnostics
TL;DR: In this article, the phase resolved partial discharge (PRPDP) pattern was used for discharge source recognition during generator diagnostics, and the frequency content of the discharge signal at the detection coupler was also investigated.
Journal ArticleDOI
Effects of converter pulses on the electrical insulation in low and medium voltage motors
TL;DR: A new IEC test specification is under development for the insulation systems used in converter-driven machines with the aim of providing manufacturers with a reliable means to quality insulation systems for use in converterfed machines and users with confidence that the machines they purchase contain insulation that is fit for their intended purposes.
Journal ArticleDOI
Objective methods to interpret partial-discharge data on rotating-machine stator windings
G.C. Stone,V. Warren +1 more
TL;DR: In this article, a review of the methods that can reduce the risk of false indications, thus making the measurement less subjective, is presented, and compared with a table that provides an objective means of determining the stator-insulation condition relative to other similar machines.