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Journal articles on the topic "Winding insulation":
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Szucs, Aron, Zlatko Kolondzovski, Jan Westerlund, and Juha Vahala. "Diamond enriched lamination and winding insulation for electrical machines." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 38, no. 4 (July 1, 2019): 1245–52. http://dx.doi.org/10.1108/compel-10-2018-0397.
Purpose The thermal management of electrical insulations poses a challenge in electrical devices as electrical insulators are also thermal insulators. Diamond is the best solid electrical insulator and thermal conductor. This can lead to a paradigm change for electrical machine winding and lamination insulation design and thermal management. The paper introduces these techniques and discusses its effect for the design of electrical machines and its potential consequences for electromagnetic analysis, for example, in multi-physics modelling. The diamond winding insulation is patent-pending, but the diamond enriched lamination insulation is published for the benefit of the scientific community. Design/methodology/approach The windings of electrical machines are insulated to avoid contact between the coil and other conductive components, for example, the stator core. The principle of using mica tape and resin impregnation has not changed for a century and is well established to produce main insulation on a complex conductor shape and size. These insulations have poor heat-conducting properties. Similarly, the insulation of laminated steel sheets comprising the stator and rotor restrict heat flow. Diamond-based insulation provides a new path. Increased thermal conductivity means reduced temperature rise and the reduced thermal time constants in multi-physics simulations and system analysis. Findings The largest benefit of a diamond-based core insulation is in electrical machines in which the losses are conducted axially to the coolant. These are machines with radial ducts and effective cooling in the end regions. The main benefit will be in reducing the number of radial ducts that positively affect the size, production costs and the copper losses of the machine. The increased thermal conductivity of the diamond insulation system will reduce the thermal constants noticeably. These will affect system behavior and the corresponding simulation methods. Originality/value Diamond insulation can lead to a paradigm change for electrical machine winding and lamination insulation design and thermal management. It might also lead to new modeling requirements in system analysis.
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Goscinski, Przemyslaw, and Zbigniew Nadolny. "Heat transfer coefficient α of insulation liquid used in power transformers, based on measurements." ITM Web of Conferences 19 (2018): 01016. http://dx.doi.org/10.1051/itmconf/20181901016.
Proper work of the power transformer is determined by many factors. One of them is relatively low operating temperature of the transformer. Too high temperature has many negative consequences, such as fast aging process of the insulation system. The temperature depends on the load of transmission line, losses and heat exchange in transformer. Heat exchange depends on heat transfer factor α of insulation liquid, which is a component of insulation system of transformer. This factor depends on many factors: the type of insulation liquid, the length of the heating element (windings), temperature, winding surface heat load, the winding position (vertical, horizontal), place on the winding (upper, middle or bottom part). The article presents the results of the measurement of heat transfer factor α as a function of type of insulation liquid, winding surface heat load, and place on the windings. The results will be used by designers and operators of power transformers.
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Kiselev, V. I., T. O. Vakhromeeva, and A. I. Fedyanin. "Increasing reliability of traction electric motors of diesel locomotives taking into account thermophysical parameters of insulation and armature winding conductors." RUSSIAN RAILWAY SCIENCE JOURNAL 81, no. 3 (September 6, 2022): 213–20. http://dx.doi.org/10.21780/2223-9731-2022-81-3-213-220.
Introduction. The issue of ensuring the operable state of the DC traction motor is relevant due to its large-scale use on diesel locomotives, including modern powerful motors, operating on lines with increased train masses. At present, a rather difficult situation has developed in the locomotive industry with the failure of diesel locomotive traction electric motors due to a decrease in the insulation resistance of the armature windings of the electric motors and their subsequent breakdowns: up to 28 % of the total number of failures of electric motors are due to breakdown of the hull insulation and interturn short circuit of the armature and 13 % of cases are due to reduction in the resistance of the insulating material.Materials and methods. The paper considers the main directions of scientific research on the causes of insulation integrity failure, which lead to unscheduled repairs of traction motors. The theoretical substantiation of the root causes of insulation destruction is based on the importance of taking into account the coefficients of thermal linear expansion of copper and its insulating materials. In order to study thermodynamic processes in the winding of a traction motor, a computational finite element model of a winding coil laid in the groove of the armature core has been developed. The winding model is represented separately by a conductor and insulation, between which contact conditions are specified. The conductor of the calculation model heats up to 120 °C from the current flow. Mathematical apparatus embedded in the MSC calculation program, Patran – Nastran, made it possible to evaluate the deformation of the conductor relative to the insulation as a result of a linear increment due to thermal expansion.Results. With the help of mathematical modelling and based on the results of finite element analysis, the confirmation of the theoretical justification is clearly shown. The difference in elongation during heating of the motor armature conductor and insulation, obtained by mathematical modelling, is 0.6 mm and is significant for the winding (consisting of a conductor and insulation), which is usually considered as a single whole body.Discussion and conclusion. The obtained result shows the need for more detailed studies to select the technology for the insulation of the DC traction motor. The use of insulating materials for the armature winding with coefficients of thermal linear expansion equal to the coefficient of thermal expansion of the copper conductors of the winding will improve the reliability of traction electric motors of diesel locomotives in operation.
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Kumar, Mahendar, Z. A. Memon, M. A. Uqaili, and Mazhar H. Baloch. "An Experimental Insulation Testing Investigation of 210 MW Generator." International Journal of Energy Optimization and Engineering 7, no. 4 (October 2018): 68–91. http://dx.doi.org/10.4018/ijeoe.2018100104.
This article describes how a drastic failure of a machine is caused by insulation collapse which results heavy interruption as well as losses. The stable operation of a generator mainly depends upon the stator winding insulation. In past, various testing and repairing techniques have been applied in order to analyze the insulation life. However, in this context, a complete stator windings insulation analysis have been carried out by testing and monitoring techniques such as insulation resistance, di-electric absorption ratio, polarization index before repair and after rehabilitation work, ac & dc high voltage, dc resistance test of winding coils, as well as surface potential test, no-load test and short circuit test. It basically reflected the insulation life of stator winding and helped to take remedial measures. This research techniques will pave the way to overcome such failure in machine and recommended the interval based tests for safety purpose.
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Leonov, A. P., and A. Supueva. "PROVIDING A MINIMUM DEFECTIVENESS OF INTER-TURN INSULATION AT THE MANUFACTURING STAGE AND DURING THE EXPLOITATION." Resource-Efficient Technologies, no. 1 (October 12, 2022): 1–9. http://dx.doi.org/10.18799/24056529/2022/1/320.
The reliability of a low-voltage asynchronous electric motor is primarily determined by the reliability of the stator winding insulation. Common reasons for the failure of the insulation system are the unsatisfactory quality of the enameled wires and electrical insulating materials used for imperfection and violation of the technological process of winding and insulating work, and the discrepancy between operating modes. In the vast majority of cases, failures occur due to damage to the inter-turn insulation as the weakest element. This causes the need to study the insulation system resistance to the formation of defects. The results of assessing the stability of the insulation of winding wires to defect formation are obtained, taking into account the features of the operational loads characteristic of frequency-controlled drives with pulse-width modulation of the output voltage and the influence of the inter-turn insulation defectiveness level on its reliability indicators is also studied. The authors have developed the measures to reduce the defectiveness of inter-turn insulation at the manufacturing stage and during operation. This will ensure a minimum level of insulation defects and increase the resource of asynchronous electric motors by reducing the number of failures.
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Poliakov, M. O., and V. V. Vasylevskyi. "Method for assessing unevenness of cellulose insulation layers aging of power transformers winding." Electrical Engineering & Electromechanics, no. 5 (September 6, 2022): 47–54. http://dx.doi.org/10.20998/2074-272x.2022.5.08.
Introduction. Improving the methods of estimating the insulation aging of the oil-immersed power transformer windings is an urgent task for transformer condition monitoring systems. The scientific novelty of the work is to take into account the uneven distribution of temperature and humidity along the vertical axis of the winding in modeling the aging of insulation and to develop methods for determining the conditions under which the aging rate of insulation in the intermediate layer will exceed aging rate in the hottest layer. The purpose of the work is to evaluate the wear unevenness of cellulose insulation based on modeling the distribution of temperature and humidity along the vertical axis of the power transformer winding. Methods. The transformer winding is mentally divided into horizontal layers of equal height, the reduction of service life is calculated in parallel for all horizontal layers. Layer with the maximum degree of aging for the entire period of operation and storage of the transformer is recognized as determining the reduction in the service life of the insulation of the transformer as a whole. A model of the interaction of winding layers is developed, with determination of temperatures, humidity, relative rate of aging of each layer due to temperature and humidity as a function of traditional design parameters such as load, cooling temperature, heat capacity and thermal resistance of transformer. The index of exceeding the aging rate by the layered method in comparison with this rate for the hottest layer is offered. The method of genetic algorithms determines the conditions for obtaining the maximum value of this index. Results. A computer model has been developed to predict the aging of the cellulose insulation of transformer windings. According to the proposed method, a layer with significantly shorter insulation aging time (in the example, time reduced by 39.18 %) than for the upper layer was determined, which confirms the feasibility of layer-by-layer monitoring and modeling of insulation aging processes of power oil-immersed transformer windings.
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Kashin, A. I., and A. E. Nemirovsky. "Analysis of depolymerization of insulating compositions of electric motor windings based on ultrasonic radiation." Vestnik MGTU 24, no. 4 (December 30, 2021): 361–71. http://dx.doi.org/10.21443/1560-9278-2021-24-4-361-371.
This work is a continuation of the fundamental study on implementing an innovative method of repairing electric motors using ultrasound. A study of the method of dismantling windings based on ultrasound has been carried out for the purpose of energy efficiency, environmental friendliness and less time spent on the repair cycle of electric motors in terms of removing the stator winding. The investigated dismantling method is optimal for a number of technical issues in comparison with the existing methods for dismantling electric motor windings. In the work, the main focus is on the material of the winding insulation. Lacquer and compound types of insulation of industrial electric motors, which are the main ones everywhere, have been analyzed. The analysis of the impregnating electrical insulating compositions of the stator windings of electric motors and the influence of ultrasound on them during dismantling of the windings of electric motors at different levels of influence of forcing factors: duration and power of ultrasonic action, concentration and temperature of the working solution. The applied mathematical software systems for calculation and modeling guarantee the reliability and rationality of the results of the experiments obtained during the work. A system of equations has been modeled and models of the effect of useful factors relative to each other have been constructed, the results obtained have been optimized and the optimal parameters of both varnish and compound insulation systems have been identified. The optimal parameters of the investigated types of insulation show encouraging results on many important points: duration, energy consumption, environmental friendliness.
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Nemirovsky, A. E., and A. I. Kashin. "Investigation of the effect of ultrasonic radiation on varnished and compounded impregnating compositions with an innovative method of dismantling electric motor windings." Vestnik MGTU 23, no. 4 (December 30, 2020): 354–63. http://dx.doi.org/10.21443/1560-9278-2020-23-4-354-363.
For the purposes of energy efficiency, ecology and less time for the cycle of repairing electric motors in the part of the excavation of the stator winding, an innovative method for dismantling ultrasound-based windings has been investigated. From a technical point of view the method has shown to be more optimal in comparison with existing methods of removing the winding. The paper is a continuation of fundamental research on the development of an innovative method of repairing electric motors. It is in this article that the main emphasis is placed on the material from which the insulation of windings is made. Lacquer and compound insulations have been considered being the main types of insulation of industrial electric motors in our country. The analysis of impregnating electrical insulation compositions of motor stator windings has been carried out; the ultrasound effect during the dismantling of motor windings at different levels of influencing factors has been studied, namely duration and power of ultrasonic action, concentration and temperature of the working solution. The validity of the scientific results obtained in the work is confirmed by the correctness of the applied mathematical apparatus and the methods of mathematical modeling, the convergence of the results of numerical modeling and full-scale experiments. A system of equations has been simulated and models of the effect of useful factors relative to each other have been built, the results obtained have been optimized during the experiment and the optimal parameters of both lacquer and compound insulation systems have been identified. The optimal parameters of the types of insulation under study have shown encouraging results on many important points compared to the existing ones: duration, energy consumption, and environmental friendliness. The validity of the conclusions regarding the adequacy of the mathematical models used has been confirmed by the results of experimental studies conducted in the framework of this work of the process of depolymerization of the electric motors' stator windings.
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Ren, Hongtao, and Jianfeng Chen. "Study on lightning impulse voltage distribution and Transfer Overvoltage of 500kV transformer." Journal of Physics: Conference Series 2260, no. 1 (April 1, 2022): 012013. http://dx.doi.org/10.1088/1742-6596/2260/1/012013.
Abstract Lightning shock wave acts on transformer, and the electromagnetic field in transformer winding is very complex. Due to the electromagnetic oscillation inside the winding, overvoltage will be produced on the main insulation or longitudinal insulation of the transformer, and the potential gradient at the end of the winding is very large, so that the insulation of the transformer is broken down. Therefore, the impact resistance of insulation should be considered in the insulation design of transformer. The amplitude and distribution of overvoltage in transformer winding will affect the selection of insulation material and insulation structure. At the same time, the analysis of transient overvoltage in transformer winding can also provide a theoretical basis for lightning warning system of power system. In order to understand the distribution of transient overvoltage in transformer winding, this paper analyzes the models of cake winding by computer simulation.
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Chumack, Vadim, Mykhailo Kovalenko, Oksana Tymoshchuk, Andrii Stulishenko, and Yevhen Ihnatiuk. "Design of a multilink system for calculating high-frequency processes in electric machines with mesh windings." Eastern-European Journal of Enterprise Technologies 3, no. 8 (123) (June 30, 2023): 54–63. http://dx.doi.org/10.15587/1729-4061.2023.282375.
This study considers the design of a multi-link high-frequency circuit for calculating defective and defect-free insulation of mesh windings in order to increase the operational reliability of general-purpose electric machines. The object of research is mesh windings of electric machines. The problem to be solved: increasing the operational reliability of electric machines with general-purpose mesh windings by analyzing and modeling defects. The research results make it possible to model defects for the analysis of the state of insulation of electric machines with mesh windings. Special attention in the research was paid to induction motors with a worn-out resource, in particular, 4A80A4 UZ engine. The analysis includes phase-to-body capacitance, winding inductance, eddy current impedance, and winding impedance. Under the WN mode, a decrease in the impedance of the winding section from 3 % to the short-circuit mode was simulated; accordingly, the resonance frequencies for each case of 3 % were determined – 73990 Hz, short-circuit – 74450 Hz, as well as the corresponding input impedances 8938.7 and 8082.5. The corresponding voltage resonances and current resonances were also determined. Appropriate results were also given for the WG scheme. The results reported here relate to the design of the scheme and the research on the defects of the mesh winding. This contributes to the analysis of the state of insulation of mesh windings. The numerical data (resonant frequencies and input impedances) allow a better understanding of the behavior of windings in different states and degrees of defects. Given the research findings, it is possible to better identify and analyze potential defects in mesh windings, which in turn contributes to increasing the reliability of electric machines. The results of this study could be used in the field of diagnosis, service, and maintenance of electric machines with mesh windings
The conducting winding of an electrical machine is insulated in order to prevent any short circuits to occur within the machine. This insulation is during its lifetime exposed to several environmental stresses and therefore plays an important role in the life length of the machine. Accelerated stress tests are used to investigate what design and material is most suitable for a good endurance of a product. In this master thesis, new accelerated test methods for the insulation system in an electrical machine are developed and evaluated. The study resulted in four stress tests that simulate the thermal stress, the thermomechanical stress and the ambient stress from direct oil cooling. Three diagnosis tests and a material analysis were used in order to evaluate how these accelerated stress test methods affected the insulation. The diagnosis tests showed no clear sign of deterioration of the insulation in terms of change in electrical characteristics. However, the material analysis indicated deterioration of the insulation, such as cracks and oxidation of the material. These changes show that the test methods are capable to affect the insulation, but will need more time to cause a breakdown, since a stator of this kind is expected to have a very long life length. Therefore, in future work on this topic, these test methods should continue for a longer time and it would likely be interesting to look into other diagnosis tests.
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Miersch, Sören, Ralph Schubert, Thomas Schuhmann, Uwe Schuffenhauer, Markus Buddenbohm, Markus Beyreuther, Jeannette Kuhn, Mathias Lindner, Bernd Cebulski, and Jakob Jung. "Ceramic-like Composite Systems for Winding Insulation of Electrical Machines." IEEE, 2020. https://htw-dresden.qucosa.de/id/qucosa%3A74384.
Insulating sheets, impregnants and encapsulation materials commonly used for winding insulation offer low thermal conductivities. This leads to an increased heating of the winding of electrical machines and to the existence of hotspots. The electromagnetical utilization of the machine has to be reduced with respect to the allowed maximum winding temperature. In this paper, the development and experimental investigation of novel polysiloxane composites with ceramic fillers are presented. The materials are tested by means of impregnated and encapsulated samples of a round-wire winding as well as the main insulation of electrical steel sheets and laminated cores. Numerical models are implemented for determining the equivalent thermal conductivity of the winding compound comprising the enameled wire and the impregnant. Based on the example of a permanent-magnet synchronous machine with outer-rotor in modular construction, the potential for increasing the electromagnetical utilization is shown.
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Rux, Lorelynn Mary. "The physical phenomena associated with stator winding insulation condition as detected by the ramped direct high-voltage method." Master's thesis, Mississippi State : Mississippi State University, 2004. http://library.msstate.edu/etd/show.asp?etd=etd-04042004-112949.
Lee, Sang-Bin. "Sensorless stator winding temperature estimation for induction machines." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/14719.
Abideen, Amar. "Dielectric Response and Partial Discharge Characteristics of Stator Winding Insulation System with SiC Stress Grading." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-284502.
The typical construction of a stator coil includes the use of end corona protection (ECP)coating, which is made of semi-conductive materials like silicon carbide (SiC). Thepurpose of ECP is to smooth the electric stress distribution near the slot exit, limitingthe electric field and partial discharge (PD) activity within the insulation system. Thisthesis investigates how ECP affects the dielectric response of a stator coil in highvoltagemeasurements, both in the time-domain and frequency-domain. It also studieshow well time-domain results transformed to the frequency-domain correspond to directmeasurements. As a further point, the effect of the ECP on PD activity was demonstrated.Measurements of dielectric response and PD were made on new coil-halves producedin the usual way in a production run for a motor. The results show that applying theECP design significantly reduces the PD activity and increases the inception voltage. Inaddition, the dielectric response of the coil with ECP tape has shown to have a nonlinearvoltage dependent characteristic due to the presence of ECP. As the voltage goes higher,this causes a shift of the loss peak toward higher frequency. A distributed-element modelof the end section of a stator coil was used to model the nonlinear effect due to ECP, andits results are compared to the measured results. Lastly, FEM simulation of a stator coilend section is presented, showing the contribution of ECP tape in evenly distributing theelectric stress near the slot exit. Den typiska konstruktionen av en statorhärva använder ändglimmskydd (ECP), somär tillverkad av halvledande material som kiselkarbid (SiC). Syftet med ECP är attjämna ut det elektriska fältet vidövergången från spåret tilländlindningen, för attundvika högpåkänning och partiell urladdningsaktivitet (PD). Arbetet som presenteras här undersöker hur ECP påverkar den dielektriska responsen hos en statorspole, vid tidsdomänoch frekvensdomänmätningar vid höga spänningar. Den studerar också hur väl tidsdomänresultat som omvandlas till frekvensdomänen motsvarar direkta mätningar. Som en annan punkt visades ECP:s inverkan på PD-aktivitet. Mätningar av dielektrisk respons och PD gjordes på nya statorhärvor som tillverkades för en stor motor. Resultaten visar att tillämpningen av ECP-konstruktionen avsevärt minskar PD-aktiviteten och ökar inceptionsspänningen. Dessutom har spolens dielektriska respons med ECP-tejp visat sig ha en ickelinjär spänningsberoende egenskap på grund av närvaron av ECP. Ö kad spänning orsakar en förskjutning av förlusttoppen mot högre frekvens. En modell för ECP användeseteendet, och dess resultat jämförs med mätningarna.utligen presenteras FEM-simulering som visar hur ECP gör fältet jämnare.
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Gavrilenko, Veronika. "Characterization of winding insulation of electrical machines fed by voltage waves with high dV/dt." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST027.
L’isolation des bobinages des moteurs alimentés par des convertisseurs statiques basés sur la modulation de largeur d'impulsion est soumise à des contraintes électriques provenant de la forme d'onde de la tension d'alimentation. Les phénomènes de nuisances électromagnétiques sur l’ensemble de la chaîne de conversion, les ondes réfléchies dans le câble d’alimentation, ainsi que la non adaptation des impédances du câble et de l’enroulement de la machine peuvent conduire à l’apparition de surtensions aux bornes de la machine suffisamment élevées pour dépasser la tension d’apparition des décharges partielles. Il en résulte une dégradation de l’isolation entre les spires qui, à terme, peut engendrer la défaillance de la machine. La mise en œuvre de composants à semi-conducteurs grand gap, tel que le Carbure de Silicium, permet la réalisation de convertisseurs de forte densité de puissance pour les systèmes d’entraînement à vitesse variable des machines électriques. Les vitesses et les fréquence de commutation élevées de ces composants conduisent à des contraintes électriques en dV/dt plus sévères sur l'isolation des enroulements des moteurs alimentés par de tels convertisseurs. L’étude expérimentale et les simulations numériques réalisées dans le cadre de cette thèse se concentrent essentiellement sur les effets des ondes de tension à forts dV/dt et de la fréquence de commutation élevée sur la robustesse de l’isolation du bobinage des machines électriques alimentées par des onduleurs. Par conséquent, les travaux touchent un certain nombre de questions liées à l’entraînement à vitesse variable, à l’électronique de puissance, aux machines électriques, aux matériaux diélectriques et aux décharges partielles The insulation of electrical machines driven by power converters with pulse width modulation are subjected to repetitive surges due to fast changing voltage pulses and reflection phenomena in supply cable, as well as non-uniform voltage distribution in the stator winding. The overvoltage at motor terminals may lead to partial discharge inception accelerating winding insulation degradation and causing its premature failure. The implementation of wide bandgap power semiconductors as Silicon Carbide allows to create converters with high power density for variable frequency drive applications. The fast and high frequency switching of electronic devices based on wide bandgap semiconductors increase electrical stresses caused by steep voltage changing rates in controlled electrical machine. It may increase a risk of partial discharges and accelerate insulation aging and destruction. The experimental investigation and numerical simulation study performed in this work is essentially focused on the effects of impulse voltage with high dV/dt and high switching frequency on winding insulation robustness of inverter-fed electrical machines. Therefore, the work covers a number of issues related to electric drives, power electronics, electrical machines, dielectric materials and partial discharges
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Sanz, Desco Raul. "Life Length and Stress Tests of Electric Machines for Electric Vehicles." Thesis, KTH, Skolan för kemivetenskap (CHE), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-214554.
Electrical machines have been widely used along the last decades with large life length under operating conditions. However, they will become more important in the upcoming years because of the emerging electric car industry. Thus, the maintenance cost of this technology can be reduced by extending the lifetime in the electrical machines. Despite the fact that existing numerous studies within the life length in these devices, only few study the effect of the thermomechanical stresses of insulation. The core of this master thesis is to study the influence of these stresses in the insulation material of a winding. The tested electrical machines were subjected to different test conditions, allowing to analyse multiple aging effects in the winding. To achieve these effects, power cycling tests were carried out on stators, where the windings were tested in cycles with different ΔT and two cooling methods: air cooling and oil cooling. The results showed large aging differences between the two cooling methods employed. The aging effect in the oil cooling method was higher than in the air cooling method for the same number of cycles. However, the aging effects regarding the same cooling process had not wide differences between the different test temperatures.
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Tallam, Rangarajan M. "Current-based sensorless detection of stator winding turn faults in induction machines." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/13429.
Saxén, Carl. "A µCT Investigation of the Electrical Breakdown Mechanisms in Mica/Epoxy Machine Insulation." Thesis, Uppsala universitet, Tillämpad mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-326170.
Mica/Epoxy machine insulation is a composite material of the mineral mica, fibre-glass mesh and epoxy resin. The material is used in motors and generators rated for high voltage, where the material must withstand multiple stresses such as elevated temperatures, mechanical and electrical stresses. This is a novel investigation that focuses on the breakdown mechanisms related to electrical stress of the insulation. These include partial discharges and electrical treeing. The micro Computed Tomography (μCT) uses a series of X-ray images to visualise the interior. This provides a method for non-invasively examination of the insulation for any signs of material degradation caused by high electrical fields. The following thesis presents an initial study on how this material system interacts with the μCT, the production of 16 samples capable of being electrically aged and scanned in the μCT, with minimal interference, sample preparation and an analysis of the images produced from the μCT. The samples produced are electrically aged at different voltages after which they are scanned with the μCT. The images produced are then analysed for signs of material degradation using different software. Some of the samples did have a complete electrical breakdown and an attempt of correlating these breakdowns to the amount of folds in the insulation is done. It is found that samples with an aluminium core are suitable for μCT imaging. The visualisation of defects such as voids, resin rich parts or folds in insulation is also possible. The detection of material degradation due to electrical aging is not clear enough to draw any conclusions although some possible signs are found. For samples that had an electrical breakdown the result is much clearer. It shows the breakdown channels path inside the insulation, moving in between the mica tape layers. The samples with a complete breakdown also had tendencies that the breakdown channels followed the resin rich part in the sample. Even if no signs of electrical treeing can be seen in the samples during aging, the breakdown channels visualised still show what path the final treeing did take and how it did so by moving around the mica tape.
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Taylor, Nathaniel. "Diagnostics of stator insulatin by dielectric response and variable frequency partial discharge measurements : a study of varied low frequencies in stator insulation, with particular attention to end-winding stress-grading." Licentiate thesis, Stockholm : Avdelningen för elektroteknisk teori och konstruktion, Kungliga tekniska högskolan, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4209.
Electrical/Electronics, Insulation Conference (21st 1993 Rosemont Ill ). Proceedings: Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference ; Chicago '93 EEIC/ICWA Exposition ; Rosemont Convention Center, Rosemont, Illinois, October 4-7, 1993. New York, NY: Institute of Electrical and Electronics Engineers, 1993.
Avila, Fernando Ciprian. Major insulation behaviour analysis systems for generator and motor windings under normal ageing conditions. Salford: University of Salford, 1992.
De, Abhinandan, and Nirmalendu Chatterjee. "A Fuzzy-Neural Technique for Flashover Diagnosis of Winding Insulation in Transformers." In Advances in Soft Computing — AFSS 2002, 156–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-45631-7_22.
Evdokunin, G. A., M. V. Dmitriev, A. S. Karpov, E. B. Sheskin, A. G. Dolgopolov, and D. V. Kondratenko. "Analysis of the Overvoltage Affecting the Converter and the Insulation of the CSR Control Winding." In Lecture Notes in Electrical Engineering, 199–213. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-25957-9_10.
Chafai, M., L. Refoufi, and H. Bentarzi. "Reliability assessment and improvement of medium power induction motor winding insulation protection system using predictive analysis." In Lecture Notes in Electrical Engineering, 367–78. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-76483-2_31.
Cimino, A., J. Horst, and F. Jenau. "Statistic Based Method for Post-processing Analysis in Lifetime Investigations of Multi-factor Aged Winding Insulation." In Lecture Notes in Electrical Engineering, 825–37. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31676-1_77.
Bezděk, Zdeněk. "Accelerators of Epoxy-Anhydride Binders for VPI Insulation System of High-Voltage Rotating Machine Windings." In Lecture Notes in Electrical Engineering, 430–38. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31680-8_44.
Shkodun, Pavel. "Preventive Diagnostics of Technical Condition of Inter-Turn Insulation of Traction Electric Motors Anchor Windings." In Lecture Notes in Networks and Systems, 217–26. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11051-1_21.
Agrawal, K. C. "Winding Insulation and its Maintenance." In Industrial Power Engineering Handbook, 9–219. Elsevier, 2001. http://dx.doi.org/10.1016/b978-075067351-8/50087-8.
"Coil Winding and Electrical Insulation." In Inductors and Transformers for Power Electronics. CRC Press, 2005. http://dx.doi.org/10.1201/9781420027280.ch4.
"New Machine Winding and Rewind Specifications." In Electrical Insulation for Rotating Machines, 463–86. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118886663.ch18.
Conference papers on the topic "Winding insulation":
1
Singh, Gopal, Santiago Lentijo, and Kalpathy Sundaram. "The Impact of the Converter on the Reliability of a Wind Turbine Generator." In ASME 2019 Power Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/power2019-1966.
Abstract Temperature rise is one of the limiting factors in generator design. Bearings and windings failure are the two most prominent cause of generator failure in the wind turbine application. The generator is mostly converter-fed in the wind turbine application, and operation with converter brings specific challenges. Insulation of generator system should be designed in such a way to withstand these challenges. Two immediate problems with converter-fed wind generators are winding temperature rise due to harmonic losses and voltage peaks. Voltage peaks generated by converter can create a winding hotspot and eventually destroy the insulation system of generator winding, which leads to reducing the lifetime of the insulation system. Turbine availability study from a commercial point of view is presented. For selecting the winding insulation system, it is essential to know the environment generator is going to operate. Specific voltage peaks from different converter systems can damage windings insulation. Damage insulation brings the downtime of the turbine, which affects the LCOE and AEP of the wind turbine. The electrical voltage between motor terminals and ground can be generated due to the different converter output circuit, longer feeder cables (when converter being placed on the basement and not in the nacelle) on the and unfavorable grounding conditions. Paper discusses voltage peaks due to operation with converter and make a recommendation for the winding insulation system, for a particular case. A better selection procedure for a generator winding insulation system is recommended.
2
Maughan, Clyde V. "Asphalt stator winding insulation." In 2017 IEEE Electrical Insulation Conference (EIC). IEEE, 2017. http://dx.doi.org/10.1109/eic.2017.8004645.
Tian, Kunpeng, Ping Li, Yu Zhao, and Xingwei Fei. "The Test of Leakage Current of Terminal Stator Winding of the 4# Generator and Defects Treatment." In 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-93102.
Abstract The insulation status of generator stator winding is related to the safe and stable operation of generator. When we repair the generator, we need different testing methods to verify the insulation of the different positions of the generator stator winding. In recent years, there is many short-circuit faults because of the insulation defect on the terminal of the stator winding. In generally, when generator need to be repaired, we do the AC/DC withstand voltage test. But when the results of AC/DC withstand voltage test are both OK, the insulation of the stator terminal winding is still not OK. that is the proof that the AC/DC withstand voltage test is not all-powerful. The test of leakage current of terminal stator winding is good effective method to checkout the the insulation of the stator terminal winding. We can find the insulation defect on the terminal of the stator winding with this test and avoid affecting the production even equipment damage.
4
Zhou, Daofan, He Yan, and Xingzhong Diao. "Three-Factor Winding Wire Insulation Aging Evaluation Based on Design of Experiment." In 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-91590.
Abstract Winding wire, as an important part of electrical equipment such as motor coils, is vital to the stable operation of reactor electrical equipment. The insulation aging of winding wire in reactor environment is affected by multiple factors such as temperature, voltage and irradiation. Due to the complex aging mechanism under the effect of multi-factor coupling, it has become a research hotspot to explore the influence of single factor and multi-factor coupling on the insulation lifespan of winding wire, and give the insulation lifespan of winding wire under multiple factors. In this paper, design of experiment (DOE) method was used to test design and results analysis, and the corona resistance tests of winding wire were carried out to get the corona resistance lifespans, which were regarded as the insulation indicator of winding wire under multiples factors. Full factorial experimental design was planned by changing the temperature, irradiation dose, and voltage amplitude at two level. The corona resistance lifespans of the samples were obtained, and the data were processed by the two-parameter Weibull distribution. Finally, the effects of single-factor and multi-factor coupling on insulation lifespan were discussed, and a model for evaluating the insulation lifespan of winding wire under the combined effects of three parameters was developed.
5
Chalise, S. R., S. Grzybowski, and C. D. Taylor. "Accelerated electrical degradation of machine winding insulation." In 2009 North American Power Symposium - NAPS. IEEE, 2009. http://dx.doi.org/10.1109/naps.2009.5484007.
Grzybowski, S., C. D. Taylor, and S. R. Chalise. "Electrical Degradation Study of Machine Winding Insulation." In 2008 International Conference on High Voltage Engineering and Application (ICHVE). IEEE, 2008. http://dx.doi.org/10.1109/ichve.2008.4773938.
Chalise, S. R., S. Grzybowski, and C. D. Taylor. "Accelerated electrical degradation of machine winding insulation." In 2009 IEEE Electric Ship Technologies Symposium (ESTS 2009). IEEE, 2009. http://dx.doi.org/10.1109/ests.2009.4906563.
Stenzel, P., P. Dollinger, D. Mihajlovic, J. Richnow, J. Franke, and C. Endisch. "Needle winding for distributed round-wire-windings without the use of insulation disks." In 2014 4th International Electric Drives Production Conference (EDPC). IEEE, 2014. http://dx.doi.org/10.1109/edpc.2014.6984387.
Sasic, Mladen, Howard Sedding, and Greg Stone. "Improvements in Direct Current Stator Winding Insulation Testing." In 2020 IEEE Electrical Insulation Conference (EIC). IEEE, 2020. http://dx.doi.org/10.1109/eic47619.2020.9158653.
Stone, G. C. "Deterioration of stator winding insulation by vibration sparking." In 2008 International Symposium on Electrical Insulating Materials (ISEIM). IEEE, 2008. http://dx.doi.org/10.1109/iseim.2008.4664445.
