Conferences related to Stator bars

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2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)

Energy conversion and conditioning technologies, power electronics, adjustable speed drives and their applications, power electronics for smarter grid, energy efficiency,technologies for sustainable energy systems, converters and power supplies


2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

The Conference focuses on all aspects of instrumentation and measurement science andtechnology research development and applications. The list of program topics includes but isnot limited to: Measurement Science & Education, Measurement Systems, Measurement DataAcquisition, Measurements of Physical Quantities, and Measurement Applications.


2020 IEEE International Power Modulator and High Voltage Conference (IPMHVC)

This conference provides an exchange of technical topics in the fields of Solid State Modulators and Switches, Breakdown and Insulation, Compact Pulsed Power Systems, High Voltage Design, High Power Microwaves, Biological Applications, Analytical Methods and Modeling, and Accelerators.


2020 IEEE Power & Energy Society General Meeting (PESGM)

The Annual IEEE PES General Meeting will bring together over 2900 attendees for technical sessions, administrative sessions, super sessions, poster sessions, student programs, awards ceremonies, committee meetings, tutorials and more


IECON 2020 - 46th Annual Conference of the IEEE Industrial Electronics Society

IECON is focusing on industrial and manufacturing theory and applications of electronics, controls, communications, instrumentation and computational intelligence.


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Periodicals related to Stator bars

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Applied Superconductivity, IEEE Transactions on

Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission


Automatic Control, IEEE Transactions on

The theory, design and application of Control Systems. It shall encompass components, and the integration of these components, as are necessary for the construction of such systems. The word `systems' as used herein shall be interpreted to include physical, biological, organizational and other entities and combinations thereof, which can be represented through a mathematical symbolism. The Field of Interest: shall ...


Dielectrics and Electrical Insulation, IEEE Transactions on

Electrical insulation common to the design and construction of components and equipment for use in electric and electronic circuits and distribution systems at all frequencies.


Electrical Insulation Magazine, IEEE

The magazine covers theory, analysis, design (computer-aided design), and practical implementation of circuits, and the application of circuit theoretic techniques to systems and to signal processing. Content is written for the spectrum of activities from basic scientific theory to industrial applications.


Energy Conversion, IEEE Transaction on

Research, development, design, application, construction, installation, and operation of electric power generating facilities (along with their conventional, nuclear, or renewable sources) for the safe, reliable, and economic generation of electrical energy for general industrial, commercial, public, and domestic consumption, and electromechanical energy conversion for the use of electrical energy


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Most published Xplore authors for Stator bars

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Xplore Articles related to Stator bars

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Basics of power factor measurements on high voltage stator bars and stator windings

IEEE Electrical Insulation Magazine, 2004

This article is a tutorial on power factor (PF) measurements on high voltage stator bars and coils and describes the basic theory associated with this important test method. In addition, the most commonly used measuring techniques and typical equipment setup used to make PF measurements are described. The coil manufacturing industry has a lot of experience performing this test and ...


Long term aging test on stator bars exposed to end arm discharges

1998 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.98CH36257), 1998

Long term aging tests of stator bar end arms were carried out over several months. Six specimens affected by one of three types of defect were studied. Those defects were corona activity, surface tracking and bar-to-bar discharges. All the specimens were submitted to an aging voltage of 20 kV c.a. Phase resolved partial discharge (PRPD) and spectral analyses were performed ...


Optimization of Transposition in Stator Bars of Hydro-Generators

2012 Sixth International Conference on Electromagnetic Field Problems and Applications, 2012

Large-scale generators tend to have high power density. In hydro-generators, stator windings commonly use Roebel bars in which strands are transposed in slot region to suppress circulating currents between strands. The Roebel bar allows increasing machine efficiency, and consequently energy savings. But in end regions of stator windings, the unbalanced leakage fluxes still produce circulating currents. To alleviate the circulating ...


Application of digital partial discharge measuring techniques for the diagnosis of high voltage generator insulation

Conference Record of the 1996 IEEE International Symposium on Electrical Insulation, 1996

In this paper, practical studies are presented in which computer-aided partial discharge (PD) diagnostics have been applied to the stator bars and stator windings of a small electric generator during factory tests and during the maintenance of different turbogenerators in power generating plants.


Improving the accuracy and overall value of stator winding insulation assessments for operational generators, through laboratory based insulation research tests on stator bars

Proceedings of IEEE. AFRICON '96, 1996

The Technology Research and Investigations division of Eskom's Technology Group (T-R-I) is currently investigating the technical and logistical merit of performing offline quadratic-rate partial discharge tests on the stator winding insulation of its hydro- and turbo-generators. A series of laboratory based insulation research studies on stator bars have been conducted to gain a better understanding of the various partial discharge ...


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Educational Resources on Stator bars

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IEEE-USA E-Books

  • Basics of power factor measurements on high voltage stator bars and stator windings

    This article is a tutorial on power factor (PF) measurements on high voltage stator bars and coils and describes the basic theory associated with this important test method. In addition, the most commonly used measuring techniques and typical equipment setup used to make PF measurements are described. The coil manufacturing industry has a lot of experience performing this test and had a major part in updating the current standard. Although measured values are a function of the coil insulation system, some typical trends in measured values are described.

  • Long term aging test on stator bars exposed to end arm discharges

    Long term aging tests of stator bar end arms were carried out over several months. Six specimens affected by one of three types of defect were studied. Those defects were corona activity, surface tracking and bar-to-bar discharges. All the specimens were submitted to an aging voltage of 20 kV c.a. Phase resolved partial discharge (PRPD) and spectral analyses were performed periodically, to characterize each type of activity. After more than one year and a half of aging, we noted that some type of activity was very sporadic, while others were more permanent. Two failures occurred up to now, both of them on specimens with corona activity. Despite the fact that the failures both occurred in the straight portion of the bars, we suspect that the corona activity was, at least partially, involved in the failure mechanism. The aging test is still running with two new specimens replacing the failed ones.

  • Optimization of Transposition in Stator Bars of Hydro-Generators

    Large-scale generators tend to have high power density. In hydro-generators, stator windings commonly use Roebel bars in which strands are transposed in slot region to suppress circulating currents between strands. The Roebel bar allows increasing machine efficiency, and consequently energy savings. But in end regions of stator windings, the unbalanced leakage fluxes still produce circulating currents. To alleviate the circulating currents in strands, one more transposition can be made in end regions. Such reduced circulating current is achieved at the cost of the consumption of more copper. Therefore, a trade-off between circulating current losses and copper losses must be made. To this end, the transposition method is optimized based on the theoretical analysis of the losses caused by circulating currents.

  • Application of digital partial discharge measuring techniques for the diagnosis of high voltage generator insulation

    In this paper, practical studies are presented in which computer-aided partial discharge (PD) diagnostics have been applied to the stator bars and stator windings of a small electric generator during factory tests and during the maintenance of different turbogenerators in power generating plants.

  • Improving the accuracy and overall value of stator winding insulation assessments for operational generators, through laboratory based insulation research tests on stator bars

    The Technology Research and Investigations division of Eskom's Technology Group (T-R-I) is currently investigating the technical and logistical merit of performing offline quadratic-rate partial discharge tests on the stator winding insulation of its hydro- and turbo-generators. A series of laboratory based insulation research studies on stator bars have been conducted to gain a better understanding of the various partial discharge phenomena involved. Results thus far obtained from these tests have provided valuable insight into the discharge activity of operational generators.

  • A method for the evaluation of insulation systems for high voltage rotating machines

    Partial Discharge Pattern of three important types of defects in insulation systems of high voltage rotating machines (the internal defect, the damaged semi-conductive screen and the defect on grading coating) were studied. As test object, model stator bars with artificial defects similar to practical ones on the ground wall and end-winding of bars were used. The internal defect in insulation was furthermore realized with a thermal ageing procedure on machine bars. The comparison of PD patterns, that were caused by different defect on stator bars presents clearly that the different defects generates different partial discharge types and that the defect type can be recognized and used for diagnosis of the insulation of high voltage rotating machines. For the interpretation of off-line and on-line measurements, the partial discharges were also measured at different temperatures in order to generate a basis for the on-site measurements, which can be only carried at given temperatures depending on the load conditions.

  • Development Process of Vibration Sparking Erosion on Stator Bars

    Vibration sparking can cause serious erosion and deterioration of the stator bar insulation. A circuit model of the semi-conductive layer of a stator bar is proposed to describe the parameters of VS generation and the distribution of the parasitic current along the semi-conductive layer. A simulated VS system was set up to generate VS activity. This paper investigated the development process of and deterioration levels of VS erosion on the bar surface with aging time and the factors influencing VS erosion. The results show that there were three stages in the VS development process with different sparking intensities at each stage. The resistivity of the semi-conductive layer greatly increased after VS erosion. It was found that high energy from VS can result in decomposition of the semi-conductive material and lead to damage of the groundwall insulation.

  • Multistress aging of high voltage stator bars

    This paper discusses a multi-stress aging test rig for the purpose of accelerated life tests of high voltage stator bars. The test rig employs electrical, mechanical, thermal and frequency aging at 500 Hz to replicate the operating stresses commonly found in high voltage rotating machines. New stator bars are used in the rig to allow the tracking of aging events from initial, non-stressed, values. Partial discharge analysis is used as the primary indication of aging phenomena. The new stator bars will be aged for a period of greater than one year, and, as a result, only preliminary measurements are presented.<<ETX>>

  • The influence of transposition angle on three-dimensional global domain magnetic field of stator bar in water-cooled turbo-generator

    In this paper, a 600 MW turbo-generator is used as an example. Three- dimensional (3-D) physical model of transposition bars in a single stator slot is established. Field-circuit coupling method is combined in 3-D numerical calculation. The influence of transposition angle on three-dimensional global domain magnetic field of stator bar in water-cooled turbo-generator is researched. The distribution changes of flux density, maximum current and circulating current loss in the corresponding transposition structure are obtained. New solution and theoretical basis will be provided for the structure optimization design of the stator bar.

  • Heat trap detection in the stator bar of large turbogenerators during the fault of cooling water channels blockage

    Cooling water is used to remove the heat from stator bar of large turbogenerators and prevent additional temperature rise. Blockage of these channels leads to heat traps along the stator bar and its temperature failure. In addition, transposition of strands in a bar causes accumulation of heat in some parts of stator bar because of non-uniform arrangement of cooling channels especially when some of channels are blocked. In this paper, effect of cooling water channels blockage is studied using a precise thermal model. It is shown that such heat traps cause additional temperature rise in stator bars and this phenomenon can not be detected by thermal sensors of turbogenerator. Laboratory and onsite experimental data are presented to verify the simulation results. An operation program is proposed to work with generator in faulty cases.



Standards related to Stator bars

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IEEE Guide for the Rewind of Synchronous Generators, 50 Hz and 60 Hz, Rated 1 MVA and Above

The general parameters for this guide apply to 50 Hz or 60 Hz synchronous generators driven by reciprocating engines, steam turbines, combustion turbines, and hydro turbines. The guide generally applies to the stator and rotor of generators with rated outputs of 1 MVA and above. The guide does not address machine auxiliaries or the excitation system.


IEEE Recommended Practice for Measurement of Power Factor Tip-Up of Electric Machinery Stator Coil Insulation

Update the withdrawn standard to reflectg new test methods and add necessary theory of test. Update and improve terminology.


IEEE Recommended Practice for Thermal Cycle Testing of Form-Wound Stator Bars and Coils for Large Generators

This procedure is intended for bars/coils for rotating machines rated 11 kV or more at 50 Hz or 60 Hz that are subjected to many transitions from no-load to full-load current during normal operations, and where rapid load variations are typical. Only the thermal cyclic degradation within the groundwall insulation and/or the conductor package and delamination of the groundwall insulation ...



Jobs related to Stator bars

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