Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Technology Conference (Cat. No.03CH37480)

23-25 Sept. 2003

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Displaying Results 1 - 25 of 124
  • Managing coil winding epoxy vacuum impregnation systems at the task level for increased yield, lower cost and extended performance

    Publication Year: 2003, Page(s):623 - 626
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (369 KB) | HTML iconHTML

    Liquid epoxy resin impregnation systems remain a contemporary, state-of-the-art polymer material for vacuum and vacuum/pressure applications in the manufacture of both advanced and conventional coil winding configurations. Their inherent latitude in processing parameters, to impart optimum cured properties to a given coil winding configuration, accounts for both their continued popularity in engin... View full abstract»

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  • A new reliability diagnostic for aged insulation systems based on cure monitoring of "motorettes" of catalyzed mica tapes wrapped on aluminum bars

    Publication Year: 2003, Page(s):619 - 622
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (346 KB) | HTML iconHTML

    A new method to verify and validate the cure of an impregnate used to bond the magnet wire of a random wound stator or transformer was first introduced in 1998. This technique showed promise in saving manufacturing time by accurately determining the cure-ensuring that large production runs could be run more efficiently thus saving time and energy. This technique has now been used to determine the ... View full abstract»

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  • Acid rain aging of silicone rubber materials in a fog chamber

    Publication Year: 2003, Page(s):17 - 20
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB) | HTML iconHTML

    It is important to the power industry that insulators exhibit long life and low electrical loss in use in the field. Increased leakage current is costly as this is lost power distribution or transmission or can lead to the generation of conductive paths and the breakdown of the insulator. The purpose of this study was to investigate the influence of applied electrical stress on silicone rubber sam... View full abstract»

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  • A high voltage insulating system with increased thermal conductivity for turbo generators

    Publication Year: 2003, Page(s):613 - 617
    Cited by:  Papers (10)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (402 KB) | HTML iconHTML

    In this paper, an insulation system with high thermal conductivity (HTC) without changing the main wall thickness or the slot design is presented. This offers significant reduction in thermal gradient in the insulation resulting in less thermal stress and higher efficiency of the machine without any basic generator design changes. This means that the long term reliability of the generator operatio... View full abstract»

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  • Selection and specification of permanent magnet materials

    Publication Year: 2003, Page(s):59 - 63
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (358 KB) | HTML iconHTML

    The selection and specification of permanent magnets is often done in an incomplete or confusing manner, frequently leading to poor product performance or an unnecessarily expensive design. It is important to conduct a thorough analysis, from the earliest stages of the design, by considering all the characteristics and deciding which ones are pertinent. This paper attempts to introduce a methodolo... View full abstract»

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  • Impulse withstand voltage characteristics of polluted insulation material surfaces under humid conditions

    Publication Year: 2003, Page(s):13 - 16
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB) | HTML iconHTML

    Recent research is indicating, that the impulse withstand voltage characteristics of insulation material surfaces are influenced by the relative humidity in a greatly differing extent. This influence mainly depends on the physical and chemical surface structure of insulation materials. In order to describe the impulse withstand voltage characteristics under humid conditions a test procedure called... View full abstract»

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  • Multi-layer epoxy-based composite material containing PET film for electrical insulation

    Publication Year: 2003, Page(s):609 - 612
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (285 KB) | HTML iconHTML

    This paper deals with the comparative analysis of statistical data on electric breakdown of the composite insulator with the PET film as a central layer and the samples of separated components-the PET film and the epoxy phenolic composite material without PET film. A multi-layer composite materials containing the mica paper and the glass fabric in combination with epoxy phenolic binder and PET fil... View full abstract»

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  • Implementation of a fuzzy logic controller on an FPGA for a DC motor

    Publication Year: 2003, Page(s):387 - 394
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (515 KB) | HTML iconHTML

    In this paper, the implementation of a fuzzy logic controller for the DC motor control is presented. Fuzzy logic controllers are generally implemented on general-purpose microprocessors or fuzzy chips. This paper presents the implementation of a fuzzy logic controller (FLC) on a Field Programmable Gate Array (FPGA) using Very High Speed Integrated Circuit Hardware Description Language (VHDL). The ... View full abstract»

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  • Unique magnetic processing

    Publication Year: 2003, Page(s):53 - 57
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (577 KB) | HTML iconHTML

    There are many challenges when magnetizing magnetic materials and building them into devices and assemblies. Flux generating permanent magnets, magnetically-soft flux carrying components, and frequently a combination of the two, must routinely be processed and assembled to achieve a specific end result. Various material characteristics and interactions may prevent the magnetic flux from going wher... View full abstract»

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  • Coil termination technology - an overview of the various methods available

    Publication Year: 2003, Page(s):523 - 526
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (355 KB) | HTML iconHTML

    One of the more important processes in coil winding is the connection of the magnet wire to the terminal pins. There are several means available to achieve this and the purpose of this article is to examine these methods and to look at the design considerations that apply to each. View full abstract»

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  • FRP hot stick flashovers during EHV live line work

    Publication Year: 2003, Page(s):7 - 11
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (505 KB) | HTML iconHTML

    In 1997 a FRP hot stick flashed over during live line work at 550 kVac. A rigorous maintenance program was instituted and all FRP hot sticks used in live line work must now withstand an annual dielectric test at 105 kVdc per 305 mm with the surface wet consistent with IEEE Std 978. More frequent electrical tests are made using a hand held tester and limits have been set for the hydrophobicity of t... View full abstract»

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  • Joining plastics - can friction stir welding compete?

    Publication Year: 2003, Page(s):321 - 326
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (413 KB) | HTML iconHTML

    As plastics become candidates for an increasing number of applications, it is important to continue developing processes to join them efficiently. In the past, a few processes have dominated the area. Now a new process, Friction Stir Welding, enters the arena of competition with the established practices. This paper delivers a comparison of several processes for joining plastic materials. Process ... View full abstract»

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  • Designing planar transformers for reliability and thermal efficiency

    Publication Year: 2003, Page(s):129 - 132
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (426 KB) | HTML iconHTML

    There has been an industry wide reluctance to employ planar designs for transformers and inductors in power supplies and other applications such as switch mode circuits because of high temperature rise and reliability problems associated with the close proximity of the coil and the core layout of planars. Not only can these obstacles be overcome, but also designers can go even further with high re... View full abstract»

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  • Estimating motor life using motor circuit analysis predictive measurements

    Publication Year: 2003, Page(s):451 - 454
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB) | HTML iconHTML

    One of the keys to the implementation of a technology for predictive maintenance and reliability is the ability to estimate how much time is left prior to equipment failure. In this presentation, we shall discuss the guidelines as to the time to failure following changes in the trending of motor circuit analysis readings. In many cases, early detection of faults and the application of this method ... View full abstract»

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  • High dielectric performance stator winding insulation system for global VPI'ed air cooled generators

    Publication Year: 2003, Page(s):605 - 607
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (314 KB) | HTML iconHTML

    Stator winding insulation system for modern global vacuum impregnated (VPI'ed) air cooled generators are designed to perform under high electrical, mechanical, and thermal stress. Each component of insulation that goes into the fabrication of the stator coil is selected and tested to a very high standard so the stator winding will withstand these stresses over it's intended lifetime. Operation of ... View full abstract»

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  • Analysis and performance comparison of a tooth wound brushless CPU cooling fan motor

    Publication Year: 2003, Page(s):379 - 386
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (534 KB) | HTML iconHTML

    Cooling fans for PC microprocessors often use two phase brushless motors to reduce electrical noise and to extend fan life. They are made with the winding on the inside of the motor (stator), and the magnet on the outside (rotor). This paper compares the static and dynamic performance of a tooth wound motor to results presented last year for a bobbin wound motor. The magnetic flux paths are descri... View full abstract»

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  • High performance FeNdB Materials and annular geometries

    Publication Year: 2003, Page(s):51 - 52
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB) | HTML iconHTML

    Sintered Neodymium Iron Boron compounds have been formed to produce flux generating components of permanent magnet devices yielding a reduction in weight and size. The use of high energy density materials, as well as their highly thermally stable counterparts, has revolutionized the design and production of many diverse devices. Through continued development efforts, these high energy density mate... View full abstract»

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  • Current streams-C for the EPXA10DB, a generic tool for the development of complex control and signal processing systems

    Publication Year: 2003, Page(s):519 - 522
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (322 KB) | HTML iconHTML

    The Altera EPXA10DB is a development platform for reconfigurable computing, coupling an ARM microprocessor and a modest Altera Programmable Logic Device (PLD) on the same chip. Streams-C is a "C" style language that addresses hardware and software generation by extending the C language. A new port of Streams-C for the EPXA10DB is being developed to provide a standalone, custom-hardware-accelerated... View full abstract»

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  • Increase of safe work distance on EHV energized objects

    Publication Year: 2003, Page(s):1 - 5
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (353 KB) | HTML iconHTML

    In two last publications, the model of flashover of HV insulation on unusually low voltages was developed. It was shown that the investigated mechanism of the anomalous discharge determines reliability of work of insulation under lightning and switching impulse overvoltages. New criteria and ways of insulation optimization are offered. Questions of application of this model for improvement of a de... View full abstract»

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  • Plastics flammability

    Publication Year: 2003, Page(s):313 - 320
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (493 KB) | HTML iconHTML

    The study of how plastics burn has been, and continues to be, a major area of research at universities, in industry, and at various national, military, and private laboratories. This research examines the nature of the burning phenomenon in plastics, various methods to reduce plastics flammability, and methods to test flammability. This paper reports on some of the basic principles of the burning ... View full abstract»

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  • Practical process in high frequency distribution transformer design

    Publication Year: 2003, Page(s):121 - 128
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (386 KB) | HTML iconHTML

    This paper details the practical, step-by-step experience encountered in the design and development of a 2 kHz, 3.5 kVA distribution transformer. Two conventional design methods were used respectively for the design: the Area Product approach, and the Core Geometry approach. The Area Product approach uses the product of the Core Window area and the Core sectional area as the principal design crite... View full abstract»

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  • Which road will you take [motor testing]

    Publication Year: 2003, Page(s):449 - 450
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (223 KB) | HTML iconHTML

    This paper deals with the importance of using motor circuit analysis when testing motors. Testing with a volt ohmmeter and an insulation to ground tester is not giving the full condition of the motor. View full abstract»

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  • A comparative evaluation of various conducting slot armour materials

    Publication Year: 2003, Page(s):599 - 604
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (510 KB) | HTML iconHTML

    The use of conducting armour media between the groundwall insulation and slot iron in large high-voltage rotating machines is required for suppression of in-slot corona during operation. To ensure continued efficient operation of high-voltage machines, the importance of maintaining an adequate degree of conductance along the length of the armour and a sufficient connection between the armour and g... View full abstract»

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  • Design consideration for commutation when designing high efficiency PMDC motors

    Publication Year: 2003, Page(s):369 - 378
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (554 KB) | HTML iconHTML

    Much effort has been spent achieving more output and smaller package sizes while trying to improve efficiency of PMDC motors. This has resulted in the need to use higher energy materials. Frequently, this leads to reduced commutation efficiency, greater EMI and reduced life. This paper will define the problems, examine the performance and recommend functional solutions for optimized design. View full abstract»

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  • How humidity affects partial discharge activity in stator windings

    Publication Year: 2003, Page(s):47 - 50
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (341 KB) | HTML iconHTML

    It has been found that PD activity may be strongly affected by humidity and/or dew using continuous on-line partial discharge (PD) monitors on operating rotating machines. This appears to be associated with specific stator winding deterioration processes such as electrical tracking and end-winding PD. Experiments have been conducted to simulate these failure processes, and to determine the effect ... View full abstract»

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