Conference Record of the 1992 IEEE International Symposium on Electrical Insulation

7-10 June 1992

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Displaying Results 1 - 25 of 117
  • Partial discharge in dielectric fluids

    Publication Year: 1992
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (69 KB)

    Summary form only given. The primary interest of this study was in the temporal and spatial development of partial discharges at voltages near their inception. Results were obtained during a short time interval after the application of a DC voltage to the test gap. Photographs showed the structure of the cavity and suggested the onset of fingerlike projections in the cavity wall. The structure of ... View full abstract»

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  • A pathway to multifactor aging

    Publication Year: 1992
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (100 KB)

    Summary form only given, as follows. The author reviews the history of thermal and electrical aging relations and analyzes their limitations. The focus is on the variety of electrical aging equations that have been used, and their empirical nature is confirmed. The author argues that the solution to the multifactor aging dilemma lies in the acquirement of an understanding of the basic mechanisms t... View full abstract»

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  • Conference Record of the 1992 IEEE International Symposium on Electrical Insulation (Cat. No.92CH3150-0)

    Publication Year: 1992
    Request permission for commercial reuse | |PDF file iconPDF (19 KB)
    Freely Available from IEEE
  • Partial discharges on power capacitors

    Publication Year: 1992, Page(s):401 - 406
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (352 KB)

    The author presents a laboratory method for measuring the partial discharges (PDs) on full-size power capacitors used in a network. The PD testing facility, the method considered to be convenient for high capacitance equipment, and the measuring techniques are presented. Tests were carried out on industrial all-film power capacitors. Results of PD measurements before, during and after endurance te... View full abstract»

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  • Development and commercialization of PPP-insulated pipe-type cable systems

    Publication Year: 1992, Page(s):203 - 208
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (352 KB)

    Development of EHV cables insulated with PPP (paper-polypropylene-paper) laminate has been successfully demonstrated. Development work in the United States and overseas is discussed. To data approximately 50 circuit miles of PPP-insulated cables up through 345 kV have been installed for commercial application. Recently a new totally domestic laminate has been developed and fully qualified for comm... View full abstract»

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  • Long time exposure influence of partial discharge (PD) to coated printed circuit boards

    Publication Year: 1992, Page(s):407 - 410
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (312 KB)

    The authors deal with the behavior of solid insulation under the long-term influence of partial discharges (PDs). As a very recent example for a low-voltage component with solid insulation, namely, the coated printed circuit board was investigated. The measurements necessary to evaluate the long-term influence of PDs were performed by computer-aided test equipment. The measurement equipment, the t... View full abstract»

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  • Partial discharge detection using ferrite antenna

    Publication Year: 1992, Page(s):371 - 374
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (312 KB)

    Some examples of partial discharge detection by using a loop antenna wound on a ferrite core were demonstrated. The prototype of a partial discharge detector system using a ferrite antenna was demonstrated. It was found that the partial discharge can be detected by measuring the electromagnetic waves irradiated from the discharge event, using the loop antenna and a wideband amplifier. The frequenc... View full abstract»

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  • Calibration of digital impulse measuring systems

    Publication Year: 1992, Page(s):298 - 302
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (456 KB)

    A brief review is presented of the historical development of the standards for high-voltage impulse measurements. Test procedures based on new standards for an impulse measuring system, consisting of an impulse divider and a digital recorder, are discussed. The practical implementation of the tests requires some additional testing equipment. Commercially available calibration and testing equipment... View full abstract»

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  • Impulse waveform effects on negative point voltage/time characteristics in gamma irradiated SF6

    Publication Year: 1992, Page(s):314 - 317
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (256 KB)

    Comparative time lag measurements were conducted for a point-to-plane geometry at 0.1 and 0.2 MPa using both steep-fronted impulses and lightning surges over the time scale 10 ns to 1 ms. The time scale over which breakdown occurs under low overvoltages was found to be the most basic difference between the two responses. Statistical analysis of the terminal measurements revealed a transition in th... View full abstract»

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  • Aging and DC breakdown characteristics of insulating stearic acid films

    Publication Year: 1992, Page(s):83 - 86
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (312 KB)

    The authors report the results of studies on stearic acid films deposited by thermal evaporation in vacuum, which is commonly used in industry. The studies included the examination of the effects of aging stearic acid films in a humid environment and under vacuum. Electrical breakdown characteristics of capacitors with a stearic acid dielectric were measured under ambient conditions. Capacitors ag... View full abstract»

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  • The effect of the polypropylene film on the impulse breakdown strength of the laminated oil-impregnated papers

    Publication Year: 1992, Page(s):209 - 212
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (268 KB)

    PPLP (polypropylene laminated paper) used for oil-filled cables in high-voltage transmission systems was studied to determine the effect of the PP film on the impulse breakdown strength. The dielectric breakdown of PPLP was compared with that of Kraft paper alone. It was found that the impulse breakdown strength was affected by the relative position of the PP film and Kraft paper. For this kind of... View full abstract»

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  • Study of effect of electrode materials on space charge characteristics

    Publication Year: 1992, Page(s):177 - 180
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (268 KB)

    To investigate the relationship between insulation and electrode materials in the formation of space charge, various combinations of insulation-grade polyetheylene and different types of electrodes were used in experiments involving the pulsed electroacoustic method. It was found that cross-linked polyethylene and low-density polyethylene showed a hetero-space-charge distribution whereas high-dens... View full abstract»

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  • Power factor tip-up reduction in high voltage coils

    Publication Year: 1992, Page(s):448 - 451
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (352 KB)

    The author reviews the coil design and processing factors that are required to obtain a well-consolidated high-voltage stator coil with minimum void content. The coils use a thermosetting epoxy-mica-tape groundwall insulation system. Quality control electrical tests are performed on new coils to verify conformance to design requirements. One of these electrical tests is the tangent delta measureme... View full abstract»

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  • Pulse propagation in rotating machines and its relationship to partial discharge measurements

    Publication Year: 1992, Page(s):411 - 414
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (356 KB)

    An investigation of the pulse propagation characteristics of motor stator windings is reported. The results indicate the effects of electrical and physical length and pulse risetime on the propagation characteristics. They explain the observed phenomena and place them in the context of partial discharge measurement techniques as used to assess the integrity of solid insulating systems of a high-vo... View full abstract»

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  • Partial discharge pattern recognition for four kinds of electrode systems

    Publication Year: 1992, Page(s):375 - 378
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (340 KB)

    The authors describe a method for recognizing partial discharge characteristics for four kinds of electrode systems. The method uses a neural network system with an input of φ-q-n distribution patterns. The θ-q-n distribution consists of the pulse count n versus the pulse height q and the phase angle φ. The learning characteristic... View full abstract»

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  • Rate of S2F10 production from negative corona in compressed SF6

    Publication Year: 1992, Page(s):328 - 331
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (372 KB)

    Using a mass-spectrometer-gas-chromatograph capable of detecting S 2F10 concentrations in SF6 down to the part in 109 level, the rates of S2F10 production from DC glow-type negative point-plane corona discharges in pressurized SF6 have been measured at different absolute gas pressures in the range of 100 to 500 kPa and at... View full abstract»

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  • The new theory of measurement technique of space charge distribution in solid dielectrics by electro-acoustic method

    Publication Year: 1992, Page(s):303 - 306
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (316 KB)

    The principle of the pulse electroacoustic method used in the measurement of space charge distribution in thick solid dielectrics is reviewed. The overall system can be turned into a linear time-invariant (LTI) system by using the theory of signals and systems. The characteristics of a LTI system are completely determined by its unit impulse response. By considering the role of the reflected waves... View full abstract»

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  • The influence of irradiation and applied DC sweeping voltage on standard lightning impulse breakdown voltage of an SF6 insulated system

    Publication Year: 1992, Page(s):318 - 319
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (144 KB)

    An electrode arrangement in compressed SF6 was studied to verify its applicability as a precise voltage chopping device under standard lightning impulse for testing purposes. The effect of irradiation of the chopping gap and the application of a low DC sweeping voltage on the gap breakdown voltage dispersion under a standard lightning impulse was also studied. The results obtained show ... View full abstract»

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  • The mechanism of degradation of polymer under electrical stress

    Publication Year: 1992, Page(s):87 - 90
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (256 KB)

    The mechanism of polymer degradation was studied by means of an accelerated electrical aging test of polypropylene. The microchemical structure and physical structure of the sample before and after aging were investigated by small angle X-ray scattering, electron paramagnetic resonance, and infrared spectroscopy. The trap parameter was evaluated using the photoconductive current spectrum and surfa... View full abstract»

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  • Accelerated water tree tests on three layer miniature cables

    Publication Year: 1992, Page(s):120 - 124
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (368 KB)

    Miniature cables were extruded using a true triple or three-in-one extrusion technique, and their performance under accelerated water tree tests was compared to that of a full-size cable. Standard test conditions were used. The cable degradation process was monitored by measuring the AC breakdown strength as a function of the aging time. High-frequency cable life testing was also initiated and is ... View full abstract»

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  • Influence of interfacial phenomena on conduction and breakdown in a thin dielectric liquid layer

    Publication Year: 1992, Page(s):213 - 216
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (372 KB)

    Experimental data relating to the influence of interfaces on the conduction and breakdown mechanisms of a thin dielectric liquid layer was obtained. The measurements were carried out to check the liquid conduction mechanisms at high electric fields. It was found that an injection phenomenon at the interface plays the dominant role. The data suggest that the physics of the electrical breakdown of a... View full abstract»

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  • Investigation of dielectric breakdown of polyvinylidene fluoride using AC and DC methods

    Publication Year: 1992, Page(s):181 - 184
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (292 KB)

    The dielectric breakdown strength of polyvinylidene fluoride (PVDF) has been investigated using both AC and DC methods. The DC breakdown strength of PVDF was in the range of 720 to 770 MV/m, which was as good as or better than that of capacitor grade polypropylene film. The AC breakdown strength of PVDF was 220 to 233 MV/m. The AC-to-DC ratio of breakdown strengths for PVDF was significantly lower... View full abstract»

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  • Electrical properties of Teflon and ceramic capacitors at high temperatures

    Publication Year: 1992, Page(s):487 - 490
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (228 KB)

    Experiments were carried out to evaluate Teflon and ceramic capacitors for potential use in high-temperature applications. The capacitors were characterized in terms of their capacitance and dielectric loss as a function of temperature, up to 200°C. At a given temperature, these properties were obtained in a frequency range of 50 Hz to 100 kHz, DC leakage current measurements were also perform... View full abstract»

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  • Transition of MOV distribution arresters from capacitive to resistive during steep-front impulses

    Publication Year: 1992, Page(s):452 - 455
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (320 KB)

    The current responses of MOV (metal oxide varistor) distribution arresters to steep-front rectangular voltage pulses were measured in the voltage range where the arresters were converting from dielectric to resistive behavior. At the lowest voltages, a purely capacitive current response was measured, with current pulses only during the rising and falling portions of the voltage pulse. At higher vo... View full abstract»

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  • PD-source identification in solids

    Publication Year: 1992, Page(s):415 - 418
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (300 KB)

    It is of great importance not only to detect but also to localize and identify the source of partial discharges (PDs). The intention is to see if there is any potential in identification of defects using an acoustic technique aided by a general theory. The idea is that PDs embedded in a solid material would excite different wave modes, depending on the structure of the defect. Standing waves or ca... View full abstract»

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