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Electrical Insulation Magazine, IEEE

Issue 6 • Date Nov.-Dec. 2000

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Displaying Results 1 - 12 of 12
  • Problems with modern air-cooled generator stator winding insulation

    Publication Year: 2000 , Page(s): 6 - 10
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    Modern stator winding design and manufacturing methods have been successful in reducing the costs of turbine generators. Problems such as thermal cycling, coil abrasion in the slot and PDs in the endwinding have lead to failures after as little as five years of operation. To avoid premature failures, users of modern air-cooled machines should ensure they have a good purchase specification, are present at the factory for critical phases of machine manufacture, operate the machine within specification, keep the windings clean, and closely inspect the stator winding after about one year of operation. The latter is much more important than it was for hydrogen-cooled machines. Although some problems cannot be corrected, effective means are available to slow down the deterioration process, if the problems are discovered at an early enough stage. View full abstract»

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  • The selection of the frequency range for high-voltage on-site testing of extruded insulation cable systems

    Publication Year: 2000 , Page(s): 11 - 16
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (308 KB)  

    High-voltage on-site tests of extruded insulation cables are necessary to check the quality of the installation of the system. The test voltage should simulate the stress under service conditions, and generate the same failure mechanism. With respect to an optimum design of test systems, a frequency range of 20 to 300 Hz, proposed in the latest IEC Draft for on-site testing of extruded insulation cables, seems to be reasonable. The test results on model cables can be used for real cables concerning the influence of the waveform on the breakdown voltage. The withstand voltage decreases with increasing frequency. The withstand voltage and the electrical breakdown field strength are very close together for frequencies between 20 Hz to 300 Hz. Mechanical defects, as well as water trees, reduce the breakdown voltage at 0.1 Hz more than at 20 to 300 Hz, but the absolute test voltage values are higher, and the breakdown mechanism is different compared with voltages of power frequency or adjacent frequencies. For on-site tests, frequency-tuned resonant test systems (ACRF) can be recommended because they have a very good weight-to-test power ratio, and very low power demands. View full abstract»

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  • Sterilization of liquid foods by pulsed electric fields

    Publication Year: 2000 , Page(s): 17 - 25
    Cited by:  Papers (28)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (362 KB)  

    Recent advances in the field of high-voltage pulse power technology have provided scope for the development of nonthermal sterilization methods free from the disadvantages commonly encountered with existing physical, chemical, or radiation sterilization. The flexibility allowed in the application of electrical energy can make high-field sterilization economical, compact, energy efficient, and environmentally acceptable. The main thrust of present research in this field is the application of high-field electric pulse technology to kill microorganisms in a manner consistent with development of industrial scale nonthermal sterilization methods. View full abstract»

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  • Low dielectric constant materials, vol. 565 [Book Review]

    Publication Year: 2000 , Page(s): 42
    Save to Project icon | Request Permissions | PDF file iconPDF (140 KB)  
    Freely Available from IEEE
  • Materials science of microelectromechanical systems (MEMS) devices, vol. 546 [Book Reviews]

    Publication Year: 2000 , Page(s): 42
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | PDF file iconPDF (140 KB)  
    Freely Available from IEEE
  • Polymer surfaces, interfaces and thin films [Book Reviews]

    Publication Year: 2000 , Page(s): 42 - 43
    Save to Project icon | Request Permissions | PDF file iconPDF (148 KB)  
    Freely Available from IEEE
  • High performance printed circuit boards [Book Reviews]

    Publication Year: 2000 , Page(s): 43
    Save to Project icon | Request Permissions | PDF file iconPDF (82 KB)  
    Freely Available from IEEE
  • Physics of nonlinear optics [Book Reviews]

    Publication Year: 2000 , Page(s): 43 - 44
    Save to Project icon | Request Permissions | PDF file iconPDF (91 KB)  
    Freely Available from IEEE
  • Organic coatings science and technology, 2 nd ed. [Book Reviews]

    Publication Year: 2000 , Page(s): 44
    Save to Project icon | Request Permissions | PDF file iconPDF (82 KB)  
    Freely Available from IEEE
  • Variable speed drive fundamentals, 3 rd ed. [Book Reviews]

    Publication Year: 2000 , Page(s): 44
    Save to Project icon | Request Permissions | PDF file iconPDF (82 KB)  
    Freely Available from IEEE
  • Author index

    Publication Year: 2000 , Page(s): 64 - 65
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    Freely Available from IEEE
  • Subject index

    Publication Year: 2000 , Page(s): 65 - 71
    Save to Project icon | Request Permissions | PDF file iconPDF (987 KB)  
    Freely Available from IEEE

Aims & Scope

The EI Magazine is specifically concerned with publishing articles in the development and characterization of the dielectric, chemical, mechanical, and environmental properties of all vacuum, gaseous, liquid, and solid electrical insulation, and with utilization of these materials in circuits and systems under conditions of use.

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Meet Our Editors

Co-Editor-in-Chief
Edward Cherney

Co-Editor-in-Chief
Robert Fleming