By Topic

IEEE Transactions on Dielectrics and Electrical Insulation

Issue 6 • Dec 1995

Filter Results

Displaying Results 1 - 19 of 19
  • Author Index 1995

    Publication Year: 1995
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1764 KB)

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Comparison of electrical aging tests on EPR-insulated minicables and ribbons from full-sized EPR cable

    Publication Year: 1995, Page(s):1095 - 1099
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The results of electrical endurance tests performed on ribbons cut from full-sized EPR cables are compared with those obtained by tests performed on cable models, having the same insulation as the full-sized cable. It is shown that the voltage endurance coefficient estimated on the basis of the short-term life test data has approximately the same value for cable models and ribbons, according to bo... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Rejection of narrow-band noise and repetitive pulses in on-site PD measurements [corrected version]

    Publication Year: 1995, Page(s):1180 - 1191
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1064 KB)

    This paper deals with the possibilities of noise suppression in partial discharge (PD) measurements under on-site conditions. After the presentation of previous work, a new concept of designing a digital FIR filter with a fixed order to suppress narrow-band disturbances is presented. The method is compared to a design using adaptive filters. A filter device, which was developed as an extension for... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Effect of physico-chemical degradation of epoxy resin on partial discharge behavior

    Publication Year: 1995, Page(s):1083 - 1094
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1132 KB)

    Epoxy resin coated electrode specimens were subjected to partial discharges (PD) in air at twice the discharge inception voltage for durations ranging to 5000 h. The PD behavior was characterized by a transition from initially large pulse type discharges (~200 to 300 pC) to either small pulse (~1 pC), pseudoglow, glow discharge, or a combination thereof. Although these different forms of discharge... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The incorporation of space charge degradation in the life model for electrical insulating materials

    Publication Year: 1995, Page(s):1147 - 1158
    Cited by:  Papers (62)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (940 KB)

    The time function of the Eyring reaction rate theory of insulation life is modified to demonstrate a physical origin for temperature threshold. Various mechanisms by which trapped charges may be involved in degrading the polymer are examined, and incorporated into the life model through an alteration to the free energies of the reacting system. The corresponding life functions are shown to possess... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Use of a mixed-Weibull distribution for the identification of PD phenomena [corrected version]

    Publication Year: 1995, Page(s):1166 - 1179
    Cited by:  Papers (54)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    The interaction between partial discharge (PD) phenomena occurring in insulating systems is investigated in this paper. In particular, the recognition of two PD phenomena simultaneously active is approached by means of a 5-parameter additive Weibull distribution. Various shapes of the PD height distribution, obtained from measurements performed on specimens of stator bars and windings of ac rotati... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Accelerated AC degradation of impregnated PP films

    Publication Year: 1995, Page(s):1075 - 1082
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    The influence of the liquid, its impurities and additives on the AC degradation of impregnated polypropylene (PP) films has been investigated. Aging of polypropylene was performed at 80°C, 135 MV/m in model capacitors filled with benzyltoluene saturated with O2 in order to increase the aging rate. The thermal oxidation of the liquid has been studied by gas chromatography, the oxida... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of electrical insulator surfaces by X-ray photoelectron spectroscopy

    Publication Year: 1995, Page(s):1140 - 1146
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    Our earlier studies centered on understanding the incipient failure mechanism in polyethylene (PE) as an insulation material. The results simulated conditions not measured in routine manufacturing or electric utility test procedures. These findings indicated that detectable changes with pure PE can occur on the surface of cavities (artificially produced), as observed by X-ray photoelectron spectro... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Insulation thickness determination of polymeric power cables [and reply]

    Publication Year: 1995, Page(s):1161 - 1165
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    Discusses the relation which exists between insulation thickness and cavity size in polymeric cables. The original author [see ibid., vol. 1, no. 4, p. 624-9, 1994] reaches the conclusion that decreasing the maximum cavity size in a given cable allows an increase in the cable working voltage. A number of assumptions in the aforementioned paper, however, need some more explanation. A reply is given... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Estimation of time-to-flashover characteristics of contaminated electrolytic surfaces using a neural network

    Publication Year: 1995, Page(s):1064 - 1074
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    A major field of neural networks (NN) application is function estimation, because the useful properties of NN such as adaptivity and nonlinearity are well suited to function estimation tasks where the equation describing the function is unknown. In this paper the prerequisite training data are obtained from experimental studies performed on a flat plate model for a polluted insulator under power f... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Space charge and electrical conduction in maleic anhydride-grafted polyethylene

    Publication Year: 1995, Page(s):1132 - 1139
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    The space charge behavior such as charge distribution and electrical conduction of maleic anhydride grafted LDPE (LDPE-g-MAH) was investigated. Heterocharge was found in LDPE and it decreased with increasing MAH graft ratio in LDPE-g-MAH. Conduction currents also decreased with increasing MAH graft ratio. The relationship between the space charge behavior and the electrical conduction characterist... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Influence of electrode geometry on ion-drag pump static pressure

    Publication Year: 1995, Page(s):1100 - 1105
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    A research program aimed at developing an EHD pump for insulating liquids is in progress at the Electrical Engineering Department of the University of Genova. The initial part of this program considered a single stage ion drag pump and was aimed at the optimization of the relevant electrodes (materials and geometry) and interelectrode gap to obtain a high hydrostatic pressure. The experimental dat... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dielectric phase angle of gall stones as a function of density

    Publication Year: 1995, Page(s):1159 - 1160
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (104 KB)

    This paper presents the dielectric phase angle of different types of gall stones at a fixed frequency of 150 kHz and at room temperature, 28°C. The average value of this parameter for soft, mixed and hard type of gallstones are found to be -83.21, -85.31 and -86.89° respectively. This was found to increase as the density of the specimen increased View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Improved piezoelectricity in solvent-cast PVC films

    Publication Year: 1995, Page(s):1106 - 1110
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The piezoelectric coefficient of solvent cast polyvinyl chloride (PVC) films processed under simultaneous stretching and corona poling (SSCP) conditions has been enhanced by ~4× (d31≈5.3±0.35 pC/N) as compared to the maximum value (0.5 to 1.3 pC/N) reported in the literature. The optimized values of d31 are compared for SSCP, stretched and corona poled (STCP),... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Surface-discharge characteristics in a ferrite-cathode diode

    Publication Year: 1995, Page(s):1045 - 1051
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    The surface-discharge characteristics of a HV diode with a planar ferrite cathode are described. This experimental setup consists of a constant HV power supply, a polarity inversion line pulser with a 200 m coaxial cable, a turbomolecular pump and a discharge chamber. The chamber was of a diode type which was evacuated by a turbomolecular pump with a pressure of 13.3×10-3 Pa and w... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of water in oil-impregnated kraft paper and its effect on conductivity

    Publication Year: 1995, Page(s):1111 - 1116
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Oil impregnated paper or polymer film is the main insulating system for many kinds of power apparatus. The oil impregnated materials, especially oil impregnated kraft paper, include a significant amount of water, and this water disturbs the insulating performance of the devices. The amount of water in the materials usually is represented by the difference in weight between the normal material and ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Particle-initiated breakdown in a quasi-uniform field in transformer oil

    Publication Year: 1995, Page(s):1052 - 1063
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    The breakdown voltage induced by single metallic cylinders of millimeter lengths in a quasi-uniform AC field are reported. A particular electrode arrangement, including forced oil circulation, has been designed in order to avoid particle ejection out of the gap. Breakdown occurred in the range 25 to 80 kV/cm depending on the particle dimensions, and always when the particle was in contact with the... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • State of water in hydrocarbon liquids and its effect on conductivity [transformer oil]

    Publication Year: 1995, Page(s):1117 - 1122
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    The humidity or the dissolved water in insulating oils influences conduction and breakdown phenomena. The corrections between the amount of dissolved water and the electrical properties have been investigated. However, the effect of water has been based only on the total amount of water because in the past there was no way to observe the state of water in oil in an electrical field. With the avail... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Charging of deformed semicrystalline polymers observed with a scanning electron microscope

    Publication Year: 1995, Page(s):1123 - 1131
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    A scanning electron microscope technique is employed to investigate the charging response of stretched semi-crystalline polypropylene (PP) and high density polyethylene (HDPE). The results reveal that the charging response of these insulating polymers varies with the amount of deformation due to stretching. The curves of charging response as a function of extension for HDPE and PP both can be divi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

IEEE Transactions on Dielectrics and Electrical Insulation contains topics that are concerned with dielectric phenomena and measurements, with development and characterization of gaseous, vacuum, liquid and solid electrical insulating materials and systems; and with utilization of these materials in circuits and systems under condition of use. 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Reuben Hackam