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Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. Proceedings

Date 23-26 Oct. 2005

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Displaying Results 1 - 25 of 103
  • Proceedings: Electrical Insulation Conference and Electrical Manufacturing Conference

    Publication Year: 2005 , Page(s): 0_1
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  • Proceedings: Electrical Insulation Conference and Electrical Manufacturing Conference

    Publication Year: 2005 , Page(s): i
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  • Copyright page

    Publication Year: 2005 , Page(s): ii
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  • The Combined Electrical Insulation Conference Electrical Manufacturing Conference and Exhibition Organization

    Publication Year: 2005 , Page(s): iii - xi
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  • Welcome

    Publication Year: 2005 , Page(s): xii
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  • Golden Omega Award

    Publication Year: 2005 , Page(s): xiii
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  • Table of contents

    Publication Year: 2005 , Page(s): xiv - xxi
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  • Author index

    Publication Year: 2005 , Page(s): xxii - xxiii
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  • Revisions of the periodic conformance testing procedures in the NEMA MW 1000 magnet wire standard

    Publication Year: 2005 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2357 KB) |  | HTML iconHTML  

    In the last few years, there has been a considerable amount of activity generated in the NEMA 6-MW Technical Committee due to a change in philosophy regarding the periodic conformance testing of magnet wire products. In the past, the periodic conformance tests have been designed around the special testing of a few standard AWG sizes, to define the unique properties of a particular magnet wire product type. These periodic conformance tests have been used to describe the uniqueness of the particular insulation system of the MW type, rather than to describe the expected performance of different wire sizes in these periodic conformance tests. The need to perform these periodic conformance tests on other wire sizes has created the demand for a new approach View full abstract»

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  • 2005 report on developments in the solderability requirements for the NEMA MW 1000 magnet wire standard

    Publication Year: 2005 , Page(s): 5 - 9
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1222 KB) |  | HTML iconHTML  

    During the past year there has been a considerable amount of activity aimed at revising the NEMA MW 1000 solderability standards to make them more consistent across the full size range of all magnet wire products. At the same time efforts continue toward harmonization with the IEC winding wire solderability standards. The final result will establish more meaningful and consistent solderability requirements in NEMA MW 1000. The current NEMA magnet wire solderability standards and our efforts to harmonize with International Electrotechnical Commission (IEC) winding wire solderability standards are briefly reviewed with special emphasis on those solderability changes introduced into NEMA MW 1000. Specifically, changes that will be discussed include modifications to NEMA solderability temperatures and the maximum time allowed for proper soldering at these temperatures. The paper then reviews the results of an industry wide solderability study of various magnet wire products in the 10-52 AWG size range to the proposed new requirements for single, heavy, and triple builds. The solderability changes discussed in this paper will have to be balloted as a revision to NEMA MW 1000 View full abstract»

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  • NEMA 6-MW magnet wire Technical Committee chairman's report-2005

    Publication Year: 2005 , Page(s): 10 - 14
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    The most recent issue of NEMA MW 1000, published in 2003 consists of three major parts. Part 1 covers general information about the standard, definitions of terminology and dimensional information that applies to the majority of the standards in Part 2. Part 2 provides specific requirements for more than 60 different magnet wire specifications. Part 3 provides actual test procedures and specific test requirements by AWG size for many of the procedures. Since 2003 there have been a number of changes made in each of these parts of MW 1000. In Part 1, new dimensional requirements have been developed and added for 8-13.5 single build products and additional definitions have been provided for minimum insulation increases and maximum OD's for a number of insulation builds and size ranges. Also, standard dimensions for half AWG sizes have been added for single build from 8-29.5 AWG, for heavy build from 4-29.5 AWG and for triple and quadruple builds from 14-29.5 AWG. In Part 2, several new standards such as MW 37-C and MW 38-C have been added and some of the requirements for other standards have been modified. In Part 3, many tests such as the adhesion and flexibility procedures and requirements have been modified and revised. Finally, some routine test procedures in Part 3 have been reclassified to become periodic test procedures and some periodic test procedures have been modified to allow testing with sizes other than 18 AWG View full abstract»

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  • 2005 report on developments in IEC winding wire standards and test methods

    Publication Year: 2005 , Page(s): 15 - 19
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1188 KB) |  | HTML iconHTML  

    IEC winding wire standards in many ways parallel the information provided in NEMA MW 1000. IEC publications 60317-0-1 through 60317-0-6 provide definitions and general requirements such as dimensions for several standard types of winding wire in a manner similar to NEMA MW 1000 Part 1. IEC publications 60317-1 through 60317-55 provide specifications for particular requirements for various standard winding wires in a manner similar to the standards provided in NEMA MW 1000 Part 2. IEC publications 60851-1 through 60851-5 provide the details of various winding wire test procedures in a manner similar to the information provided in NEMA MW 1000 Part 3. IEC publications 60264-1 through 60264-5 provide winding wire packaging specifications and test procedures for a number of different IEC standard winding wire packages in a manner similar to the information provided in NEMA MW 1000 Appendix B. This paper will discuss the changes that have been made to the aforementioned IEC publications since 2003, and discuss in some detail the similarities and differences between IEC and NEMA MW 1000 requirements and test procedures. The paper will also discuss past efforts and future opportunities for improved harmonization between IEC and NEMA winding wire standards and test procedures View full abstract»

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  • Diagnosis of electrical treeing phenomenon in XLPE insulation

    Publication Year: 2005 , Page(s): 20 - 25
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1868 KB) |  | HTML iconHTML  

    Electrical tree formed in XLPE insulation sliced from 220 kV rated cable was diagnosed by partial discharge and dielectrometry measurements and optical observation. The effects of aging by rate of rise in electrical stress and time are reported. Observed intermittent light emission and tree paths supported the theory of emission of protons due to high energy electrons View full abstract»

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  • Temperature calculation of power cable conductor in real time

    Publication Year: 2005 , Page(s): 26 - 29
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1203 KB) |  | HTML iconHTML  

    The node voltage method is widely used to solve electric circuit problems. It is also an effective method to set up and calculate power cable thermal conditions because the equivalent thermal circuit of a power cable is mathematically similar to an electric circuit. According to real time measurement results of polymeric jacket temperatures of power cables, the temperature of the cable conductor may be calculated using the node voltage method. Furthermore, the power cable load current can be controlled in real time based upon the conductor temperature View full abstract»

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  • Study on insulation structure of fast slide in termination and joint for 15 kV power cable applying to live work on site

    Publication Year: 2005 , Page(s): 30 - 33
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1651 KB) |  | HTML iconHTML  

    Analysis and resolution of electric field distribution in fast slide-in termination and joint using finite element numeral analysis method described in this paper. Rules of interface compress stress, compress strain, and rubber material peristaltic change as well as material fatigue character after inserting and drawing 1000 times are discussed. The research results proved that electric field controlled cone design in insulation structure of the terminations and joints is important. The elasticity and permanence distortion of the EPR used as the main insulating material may be 50% and 2%. Inserting and drawing surplus tolerance of the termination and joint should not exceed 1.7 View full abstract»

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  • On site PD detection on XLPE cable accessories

    Publication Year: 2005 , Page(s): 34 - 37
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1752 KB) |  | HTML iconHTML  

    On-site partial discharge detection on XLPE cables accessories is very difficult because of pulse noise interference, such as pulse interference created by automobile ignition coils on the street, etc. A suitable solution for the monitoring of cable accessories during operation is a sensitive on-site PD detection method. This can be realized in an advantageous way with combinatorial sensors, an antenna sensor, a UHF sensor, and two VHF split-core PD sensors. These sensors are not connected to the high voltage directly, a UHF sensor can be placed near the cable joint and two split-core sensors can be installed on both sides of the cable joint easily and safely. The detection making several windows in the time domain towards multiple wide-band pulse signals can achieve reliable discrimination of real internal PD and external noise under noisy on site conditions. More than twenty cases of on-site PD detection for HV XLPE cables have been proven this way. This method has high detection sensitivity and high noise recognition ability View full abstract»

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  • Research on surge arc prolongation device for power cable fault location

    Publication Year: 2005 , Page(s): 38 - 41
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1346 KB) |  | HTML iconHTML  

    The development of an arc prolongation device for the secondary impulse method used in power cable fault location is reported in this paper. The faulty cable breaks down by a HV surge. Prior to the arc extinguishing, the device will supply, automatically, the energy to the faulty cable to sustain the arc sufficiently for the secondary impulse test. The device consists of an energy generator, wave blocker, impulse duration modulator, and signal coupler which are mounted in a compact case. This makes it easy to link the device with the surge generator and faulty cable on site. Since the output voltage is low, the device is safe for the cable's good insulation. Both simulations and laboratory tests show the device can prolong the arc for many milliseconds. The on-site secondary impulse method tests using this device produces fault location waveforms on the instrument's screen View full abstract»

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  • Considerations of AC and DC testing of large electrical stator windings and components

    Publication Year: 2005 , Page(s): 42 - 45
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (805 KB) |  | HTML iconHTML  

    This paper is written on the basis of recommendations in IEEE Std 95-2002. It is common practice to use both AC and DC power supplies for the high potential testing of large electrical generator stator windings. A much higher voltage, well above the machine operating voltage; is almost always used. This paper reviews the procedures, results and test aspects of both the AC and DC testing of stator coils and the completed stator winding. The major issues addressed are the voltage levels used; where and when they are applied; the relationship between the AC and DC test voltage levels; what components of the winding are actually being tested; and are the presently used multiplication factors between DC and AC really being used correctly? A significant issue to address is that the stator coils and the stator winding layout, is designed to primarily get through the final AC or DC hi-pot test Should this present way of thinking still be followed in going forward in the future? View full abstract»

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  • Performance evaluation of pump generator stator coils with corona resistant polyimide film

    Publication Year: 2005 , Page(s): 46 - 49
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2503 KB) |  | HTML iconHTML  

    A 69 MVA pump-generator with corona resistant filled polyimide film applied as stator coil strand insulation has been returned to service. Design modifications were implemented to take advantage of the new insulation system; testing results of these unique 13 kV stator coils are discussed. Operation data from the rewound machine is presented. This is a companion paper to "Application of Corona Resistant Polyimide Film to Pump Generator Stator Coils" presented at ISEI 2004 View full abstract»

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  • Monitoring of generator condition and some limitations thereof

    Publication Year: 2005 , Page(s): 50 - 53
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (974 KB) |  | HTML iconHTML  

    Historically turbine-generator condition was monitored by rather primitive instrumentation, e.g., ammeters, voltmeters, temperature sensors. More advanced instrumentation devices have been added in the last 25+ years, e.g., partial discharge, turn-short flux probe, core monitors. But there still remains little or no detection capability for some of the major deterioration mechanisms, e.g., bar vibration without partial discharge, stator bar clip liquid leaks, series/phase joint copper cracking, developing field turn cracks, field insulation abrasion/cracks, retaining ring corrosion and cracks, field forging cracks. This paper will discuss root causes and progression rates of some generator deterioration mechanisms. The resulting negative impact on generator reliability of extending the periods between outage inspections can be high. Advantages of remaining with the historic 5-year period between outages will be illustrated View full abstract»

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  • On line monitoring of bushings on large power transformers

    Publication Year: 2005 , Page(s): 54 - 60
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1922 KB) |  | HTML iconHTML  

    Industry statistics suggest that 80% of all plant and equipment failures occur on a random basis and only 20% of the failures are age related. This means that 80% of failures have not been detected with common test and maintenance practices and therefore these failures have not been prevented. Based on different sources up to 30-35% of large power transformer failures are attributed to bushing insulation failures. About half of these bushing failures result in an explosion and fire. In today's competitive environment, increasing demands are being placed on the management of physical assets. Advances in technology are allowing new approaches to maintenance. These include reliability-centered maintenance, predictive maintenance, condition monitoring, and expert systems. Trend setting organizations are increasingly taking advantage of the convergence of these new technologies to implement proactive maintenance programs View full abstract»

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  • On-line monitoring of HV bushings and current transformers

    Publication Year: 2005 , Page(s): 61 - 66
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1642 KB) |  | HTML iconHTML  

    There has been a pressing need for on-line monitoring and diagnostic techniques for HV bushings and current transformers where deterioration often results in catastrophic failure. This paper expands the available information on this topic and presents the technique for the on-line measurement of dielectric power-factor and capacitance using the Doble M4000 insulation analyzer View full abstract»

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  • Experience repairing a serious stator core fault on an 80 MVA vertical water wheel generator

    Publication Year: 2005 , Page(s): 67 - 70
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3029 KB) |  | HTML iconHTML  

    The unexpected failure of an 80 MVA hydro generator seriously damaged the stator core. A river system with high water left few options for repair. Aggressive methods were used to return the unit back to service while a new core section was delivered to site View full abstract»

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  • A new diagnostic tool for preventive maintenance on large generators-PD location in stator windings by the traveling wave method

    Publication Year: 2005 , Page(s): 71 - 77
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2960 KB) |  | HTML iconHTML  

    The development of cost-effective maintenance strategies requires diagnostic tools which detect any defects as early as possible to enable the determination and selective planning of the requisite repair measures. The sensitive partial discharge (PD) measurement method enables the detection of individual weak points developing in generator high voltage stator insulation in their initial stages. However, a reliable evaluation also requires the most exact possible knowledge of the location of the insulation where partial discharge occurs. The following paper presents a method enabling the precise localization of internal partial discharges in the shielded slot section of stator windings based on the localization principle of transit time difference measurement between the two sides of the stator core. The PD pulses are decoupled from the winding bars using a patented new type of sensor, digitized at a high sampling rate of 4 GS/s and subjected to mathematical analysis. Measurements on old winding bars from large generators and on complete stator windings (40-1640 MVA) yield high localization accuracies within the range of centimeters. In a rewound 880 MVA generator with an active core length of 6.6 m, a partial discharge source was localized which could not be detected by conventional equipment at the generator terminals. This demonstrates the excellent sensitivity of the new diagnostic tool View full abstract»

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  • The use of transient current for the evaluation of the condition of rotor and stator insulation systems of large synchronous rotating machines

    Publication Year: 2005 , Page(s): 78 - 81
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (649 KB) |  | HTML iconHTML  

    Results related to the measurement of transient currents recorded after a DC voltage step followed by a short-circuit are reported for both rotor and stator windings for a number of hydro and turbo synchronous rotating machines, motors and generators, in order to assess the quality of the insulating system. Measurements were conducted in the field for windings from different technology yielding different time domain response. Besides reckoning the aging of the insulation, other features such as moisture absorption, end-winding contamination and incomplete curing of the insulating resin (followed by post-curing) were detected in several cases View full abstract»

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