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Electrical Insulation Conference, 1997, and Electrical Manufacturing & Coil Winding Conference. Proceedings

Date 25-25 Sept. 1997

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Displaying Results 1 - 25 of 152
  • Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference

    Publication Year: 1997
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    Freely Available from IEEE
  • Author index

    Publication Year: 1997, Page(s):xxv - xxvi
    IEEE is not the copyright holder of this material | PDF file iconPDF (112 KB)
    Freely Available from IEEE
  • Importance and methods of tension control [coil winding process]

    Publication Year: 1997, Page(s):517 - 523
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (340 KB)

    Within this paper, the requirements on electronic active controllers being part of modern coil winding machines are discussed and compared to the largely used passive mechanical wire dereelers. Special emphasis is given to the control theory behind the execution of this relative new technology and the fields of application where electronic controllers have advantages over existing solutions. A vie... View full abstract»

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  • Mechanical design principles for automated coil winding

    Publication Year: 1997, Page(s):513 - 516
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (444 KB)

    This paper describes the mechanical design needs commonly required to manufacture electrical coils. It discusses types of coils and presents production design information which include tolerance requirements that are commonly omitted in design considerations View full abstract»

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  • New high strength polyester glass banding tape

    Publication Year: 1997, Page(s):259 - 265
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (420 KB)

    New high strength polyester glass banding tape is made from continuous filament electrical grade fiberglass yarn, impregnated with a thermosetting polyester resin system. The yarns are laid parallel to form a thin flat ribbon with exceptional strength. As supplied, the tape is soft and pliable with a slight amount of tack. During the cure the resin flows filling voids and air spaces to produce a h... View full abstract»

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  • Choosing documentation to optimize the winding process

    Publication Year: 1997, Page(s):733 - 735
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (248 KB)

    The objective of this discussion is to provide examples of alternate means of documenting manufacturing processes for coil winding. This discussion deals with the photograph insert process of documenting critical design parameters in assembly processes View full abstract»

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  • Perfect layer winding

    Publication Year: 1997, Page(s):731 - 732
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (92 KB)

    Perfect, or orthocyclic winding yields a higher copper density than any other method, approaching a theoretical 90.6% for a large number of turns. This compares with 78.6% for a square lay, where each successive layer rests directly on the turns of the layer below it, or an approximate 84% for a more or less random winding. At first glance, perfect layer winding would seem to be easily achieved, s... View full abstract»

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  • Design and method considerations for successful soldering

    Publication Year: 1997, Page(s):59 - 61
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (228 KB)

    The objective of this paper is address issues that should be considered early in the design and manufacturing stages of components which require the application of soldering processes. Suggestions are offered which will help to prevent problems which normally arise in new designs View full abstract»

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  • Defect free assembly of SMT devices

    Publication Year: 1997, Page(s):677 - 682
    Cited by:  Papers (3)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (468 KB)

    Process control is the only way to achieve defect free soldering. Soldering is a simple and repeatable process which is easily controllable. Inspection is less than 70% effective and cannot guarantee joint quality. Reworking and touch-up always reduces the life of solder joints. Inspection and reworking add nothing to the value of the product. A correctly set-up machine can never cause defective j... View full abstract»

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  • Lean manufacturing: a process for all seasons

    Publication Year: 1997, Page(s):849 - 851
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (240 KB)

    As implied in its name lean manufacturing is a process which optimizes the relationship between resources, human and material, and the output in order to maximize customer satisfaction and profits. It can be adapted to all manufacturing situations from the job shop environment to the high volume single product or multi-product factory. Three case studies illustrating each one of these scenarios ar... View full abstract»

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  • World class manufacturing [of electric motors]

    Publication Year: 1997, Page(s):135 - 144
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (708 KB)

    The primary purpose of this paper is to demonstrate that world class manufacturing represents a goal that all motor manufacturers should seek. The focus is on continuous improvement and the process elements for achieving world class status. A “Road Map-A Route To Implementation”, is shown. Examples of world class “best” performances and results are illustrated. This paper i... View full abstract»

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  • The use of diagnostic testing of insulating oil for fault detection in electrical equipment

    Publication Year: 1997, Page(s):537 - 541
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (424 KB)

    The operating health of oil-filled electrical equipment can often be determined by the extent of degradation of the insulating fluid. This paper examines the basis for the analytical techniques that are used to correlate the composition of dissolved gases with operational faults such as partial discharge, pyrolysis and arcing. With suitable modifications, these methods can be applied to transforme... View full abstract»

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  • The benefits of automated armature balancing [of electric motors]

    Publication Year: 1997, Page(s):509 - 512
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (272 KB)

    The author discusses how there are many types of operator errors and inaccuracies typically associated with the manual balancing of electric motors. These errors combined, cost both time and money, as well as the possible reduction of overall motor performance. As production rates increase and balance tolerances continue to tighten, manual balancing will become increasing more difficult and imprac... View full abstract»

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  • Winding techniques to raise SRF

    Publication Year: 1997, Page(s):729 - 730
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (160 KB)

    With the advent of higher and higher operating frequencies required of modern magnetic devices it is generally important to have as high a self resonant frequency (SRF) as possible. In the case of the more complex winding techniques required to raise SRF the penalties are increased labor costs, and for the customer, increased system part count. The bifilar winding of center tapped windings greatly... View full abstract»

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  • Light emission study in transformer oil and along oil/cellulose interface using a spark-gap system

    Publication Year: 1997, Page(s):469 - 475
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (476 KB)

    Interfaces between oil and oil-impregnated-pressboard are known to weaken insulation system strength. The work here describes differences in the observed discharges in transformer oils and along oil/oil-impregnated-pressboard interfaces. Oil breakdown in a uniform electric field was initiated by triggering a spark gap either at the anode or at the cathode using a liquid trigatron. Light emission d... View full abstract»

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  • On-line diagnostic tests on APT-450 potential transformers

    Publication Year: 1997, Page(s):549 - 552
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (380 KB)

    After the “infant mortality” period, high-voltage potential transformers usually have an extended service life. Due to aging of the insulation, their failures can cause serious system operating problems. Periodic on-line monitoring of the transformer ratio and partial discharge activity could be a good solution in forecasting and preventing such failures View full abstract»

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  • SMUD averted a major outage by using the largest mobile transformer built with high temperature insulation

    Publication Year: 1997, Page(s):481 - 483
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (252 KB)

    This is, so far, the largest transportable (mobile) liquid-filled auto three-phase power transformer with a high temperature insulation used successfully for a utility emergency application in the USA. In order to obtain the 100 MVA capacity, for this transformer, without exceeding certain size and weight limits for transportability, the transformer has to be designed with a 95°C average windi... View full abstract»

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  • New developments in resin rich insulating systems for high voltage rotating machines

    Publication Year: 1997, Page(s):607 - 618
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (624 KB)

    Combining the up-to-date knowledge in polymer science with the well known electro-mechanical requirements of a high voltage rotating machine and the prescriptions of an economical manufacturing process, GEC ALSTHOM has designed a brand new resin rich-based insulating system which has been industrially produced for 5 years now. The system uses a unique fast curing F class solventless epoxy formulat... View full abstract»

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  • High performance thermoplastics for coil forms

    Publication Year: 1997, Page(s):673 - 676
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1140 KB)

    The development of high performance thermoplastic resins such as liquid crystal polymers and high temperature polyamides, with melting points in the 300°C range, has opened up a broad range of new opportunities for thermoplastics in coil form applications formerly limited to thermosets. These materials are now used to encapsulate coils employed in high temperature environments. Modified thermo... View full abstract»

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  • Evaluation of electrical insulation using genetically evolved artificial neural nets

    Publication Year: 1997, Page(s):279 - 282
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (176 KB)

    The degree of electrical insulation degradation depends strongly on the insulation's defects. Different types of insulation defects generate different partial discharge (PD) patterns. The correlation that exists between a defect and its pattern is identified and recognized by popular artificial neural nets (ANN) as they significantly improve the recognition of complex patterns in noisy data. An ev... View full abstract»

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  • Can PD phenomenon be analysed by deterministic chaos?

    Publication Year: 1997, Page(s):283 - 289
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (568 KB)

    Knowledge of partial discharges (PDs) is important to diagnose and predict the health of insulation. Using a well established and experimentally verified model of PD for ellipsoidal voids (Niemeyer and Gutfleisch [1995]), it has been shown that a part of the underlying dynamics of the PD process can be explained by using the principles of chaos mathematics. This paper further indicates the possibl... View full abstract»

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  • Analysis of aging characteristics of service-aged 22.9 kV anti-contamination line post insulators

    Publication Year: 1997, Page(s):795 - 798
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (256 KB)

    In this study, the effects of cracks on the electrical breakdown of line post insulators were investigated by comparing a new insulator, manufactured in 1996, with service-aged insulators which has been used in areas of severe contamination, heavy dust contamination and mild contamination. These insulators were tested to the ES and IEC specifications and especially analyzed using HRB tests, materi... View full abstract»

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  • Abrasivity testing of filled epoxy resins

    Publication Year: 1997, Page(s):131 - 134
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (256 KB)

    The epoxy resins used to encapsulate automotive ignition coils and other high voltage electrical devices typically contain filler material in order to reduce the cost and to improve the material properties of the cured epoxy. However, these filler materials are abrasive and, as such, detrimental to epoxy encapsulation equipment. The abrasivity of two epoxy resins with different filler types was qu... View full abstract»

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  • Stabilization of transformer oil against oxidation old practice with renewed interest for preventive maintenance

    Publication Year: 1997, Page(s):529 - 536
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (564 KB)

    This paper reviews the mechanism of oil failure due to oxidation, and the detrimental effects on power transformer operation. Also reviewed are the major tests available to diagnose the condition of the transformer oil relative to oxidation stability. Limits are suggested which indicate when oil reclamation or addition of oxidation inhibitor is necessary. An example is given of a representative tr... View full abstract»

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  • Using manufacturing tolerances and practices to minimize unbalance [in electric motors]

    Publication Year: 1997, Page(s):505 - 508
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (272 KB)

    The objective of this paper is to illustrate the role manufacturing tolerances and practices play on the initial unbalance in final motor armature assemblies. Assemblies consisting of several components can have a tolerance build-up which can make the balancing process difficult and time consuming. This build-up of tolerances will invariably create eccentricity errors, causing a shift in the princ... View full abstract»

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