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Electrical Insulation, IEEE Transactions on

Issue 3 • Date June 1980

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Displaying Results 1 - 25 of 27
  • IEEE Transactions on Electrical Insulation

    Publication Year: 1980 , Page(s): c1
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  • IEEE Electrical Insulation Society

    Publication Year: 1980 , Page(s): c2
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  • U. S./Japan Seminar on Electrical Conduction and Breakdown in Dielectrics

    Publication Year: 1980 , Page(s): 129 - 130
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  • A Review of the U.S.-Japan Seminar on Electrical Conduction and Breakdown in Dielectrics and Some Thoughts on Problems to be Solved

    Publication Year: 1980 , Page(s): 131 - 133
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  • A Perspectuce on Insulation Systems in the Electric Power Industry

    Publication Year: 1980 , Page(s): 134 - 138
    Cited by:  Papers (1)
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    The insulation systems of major power system components are reviewed in the context of the environment in which they must function. The viewpoint is that of a power engineer rather than a materials scientist. The compound nature of stress - electrical, mechanical, and thermal, is emphasized. The strengths and shortcomings of traditional insulating materials are considered and the implications of power system trends are analyzed as far as insulation is concerned. Current problems and challenges are described. View full abstract»

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  • High Field Conduction and Breakdown in Solid Dielectrics

    Publication Year: 1980 , Page(s): 139 - 151
    Cited by:  Papers (15)
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  • High-Field Conduction and Breakdown in Gases

    Publication Year: 1980 , Page(s): 152
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  • IEEE Electrical Insulation Society

    Publication Year: 1980 , Page(s): 152
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  • Surface Discharge and its Application

    Publication Year: 1980 , Page(s): 153 - 166
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  • Review of Past Work on Liquid Breakdown

    Publication Year: 1980 , Page(s): 167 - 170
    Cited by:  Papers (2)
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  • Optical Study of Conduction and Breakdown in Dielectric Liquids

    Publication Year: 1980 , Page(s): 171 - 181
    Cited by:  Papers (30)
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    On the optical studies of electrical conduction and breakdown in dielectric liquids, recent works which have been studied in Japan are briefly reviewed first. Next, the results of study in our laboratory on the measurement of ion mobility and on the breakdown process in liquids are presented. When an electrode system such as razorblade emitter-grid-collector is used for the measurement of ion mobility by the time of flight method, the field uniformity between grid-collector is calculated, and the space charge effect related to the current density is investigated. Through these researches suitable condition for ion mobility measurement are revealed. On the breakdown process, the schlieren method and high-speed photography are used under a pulse voltage applied to a needle-plane gap. Various aspects of the breakdown process from streamer initiation to main stroke, the polarity effect of streamer propagation, the relation between the mean velocity of positive streamer Vm and molecular structure of liquid, the relation between vm and pre-breakdown current, Vm of mixed liquid etc. are described. View full abstract»

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  • Research in the Dynamics of Electrical Breakdown in Liquid Dielectrics

    Publication Year: 1980 , Page(s): 182 - 185
    Cited by:  Papers (9)
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  • Dependence of Dielectric Breakdown of Liquids on Imolecular Sturcture

    Publication Year: 1980 , Page(s): 186 - 200
    Cited by:  Papers (8)
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    High field carrier transport, electron multiplication and breakdown in liquids of various molecular structure are discussed. Breakdown characteristics depend on the molecular structure of liquids. Breakdown strength and its polarity effect are determined by the combination of the energy input from electric field and energy loss which depend on electron mobility and internal vibrational mode respectively, therefore on molecular structure. In rare gas liquids with high electron mobility like liquid Ar, Kr and Xe the electron avalanche is the mechanism of the breakdown. However, in liquid He, electron injection from cathode is the determining process for breakdown and the polarity effect of breakdown in liquid He is completely different from other liquids. In hydrocarbon liquids of ultra-high purity, which have high electron mobility in the case of spherical molecules, and also even in the case of linear molecules at high fields, the electron avalanche (or positive streamer) is also important in the short time range (nsec). However, thermal effects are significant in the long time range. Change of breakdown mechanism from bubble process to positive streamer process with decreasing pulse width and increasing pressure is indicated clearly in liquid N2 as an example. Effect of impurities on breakdown is also dependent on the molecular structure of liquids and solutes. Laser induced breakdown is strongly dependent on the molecular structuire and also can be explained in terms of electron avalanche by the high-frequency breakdown theory. View full abstract»

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  • Insulation Ageing Studies by Chemical Characterization

    Publication Year: 1980 , Page(s): 201 - 205
    Cited by:  Papers (6)
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    In order to better understand the chemistry of ageing processes, a number of parameters beyond brittleness or end-of-life must be followed. Several techniques which attempt to follow changes at the molecular level are described in addition to the morphological studies using microscopy. Because of the very subtle changes taking place in a solid dielectric at conditions not much more severe than service conditions, attention has been paid to the sensitivity of the methods used. The techniques described along with other more novel techniques must be utilized in order to truly understand thee chemistry of the ageing of solid dielectrics. View full abstract»

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  • Dielectric Breakdown Process of Polymers

    Publication Year: 1980 , Page(s): 206 - 224
    Cited by:  Papers (63)
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    Much experimental work has been done on the dielectric breakdown of solid dielectrics, and a number of breakdown theories have been proposed. Many problems, however, still remain on the breakdown process of polymers. Here, the breakdown process of polymers are discussed from the standpoint of the inherent properties of polymers such as chemical structure, structural irregularities, the presence of additives, molecular motion, and so on. Further, as for the long-time breakdown processes of polymer insulation systems, electrical degradations caused by (PD) and treeing breakdown have been mentioned as important factors. Using experimental results obtained in our laboratory together with those presented by others, our considerations for fundamental processes of electrical degradation are reported. Also, the behavior of dc trees caused by space charge accumulation are discussed with the nature of carrier injection and trapping in polymers, which are estimated by TSC and TL measurements. View full abstract»

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  • On the Mechanism of Dielectric Breakdown of Solids

    Publication Year: 1980 , Page(s): 225 - 240
    Cited by:  Papers (26)  |  Patents (7)
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    The mechanism of dielectric breakdown in solids, according to recent experimental evidence, involves the creation of a gaseous channel through the dielectric. The high conductance of breakdown appears to be associated with this channel, not with conduction through the solid itself. The central problem in the theory of dielectric breakdown in solids is thus to explain the development, in a strong electric field, of a macroscopic gaseous channel through the dielectric before the large change of conductance characteristic of dielectric breakdown. Recent experimental results will be reviewed and a gaseous model of breakdown in solids will be described in terms of four stages: Formative, Tree Initiation, Tree Growth and Return Streamer. The model is still in the stage of phenomenological development. View full abstract»

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  • Dielectric Properties and Morphology in Polyethylene

    Publication Year: 1980 , Page(s): 241 - 250
    Cited by:  Papers (21)
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    Polyethylene consists of crystalline parts and amorphous parts. Trap sites for electrons or ions exist on a boundary between them. Mechanical drawing or isothermal crystallization of a bulk from its melt provides increased trap sites due to change of morphology in crystalline lamellae. The trap sites for electrons might be physical cavities, where the cavity probably is best pictured as an irregular space bounded by a particular local arrangement of molecular chains which would be changed by drawing or annealing. The TSC peak is enhanced by drawing, and also we observe particular SCL current characteristics modified by the increase of trap sites. 90% of the vinyl groups in polyethylene are reported to be located at the surface of the crystallite and are able to become trap sites. However, no increase of vinyl groups (910 cm-1 and 990 cm-1) in IR spectra could be detected in a film drawn twice. The morphology of crystalline lamellae is changed by drawing. Breakdown strength is controlled by the tilting of slip planes in crystalline lamellae due to an applied force. Crystalline blocks aligned along the tensile axis might be resistive for electrons attempting to accelerate across aligned chains. It is well known that homogeneous deformation of spherulites due to straining provides a direction for development of an electrical tree. In our experiment, the breakdown strength is higher in the case of a small difference in density between crystalline lamellae and amorphous parts. View full abstract»

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  • Research on Water Treeing in Polymeric Insulating Materials

    Publication Year: 1980 , Page(s): 251 - 258
    Cited by:  Papers (10)
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    Experimental and theoretical investigations for water treeing have been performed on polymeric insulating materials subjected to ac and dc stresses. It was experimentally and theoretically presumed that no water trees are initiated in polymeric insulating materials when applying dc voltage. However, water trees have been found in polymeric insulating materials even under the influence of dc stress. To determine the effects of water trees upon a cable's life in service is now a serious problem in the world. The status of research for water trees performed so far in Japan will be presented first, and then future work will be suggested. View full abstract»

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  • Breakdown of Composite Dielectrics: The Barrier Effect

    Publication Year: 1980 , Page(s): 259 - 263
    Cited by:  Papers (9)
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    The breakdown voltage of a rod to plate gap is largely affected by the insertion of an insulating paper in the gap and this is known as the barrier effect. The complicated characteristics of the breakdown were studied experimentally for dc, ac, lightning and switching impulse voltages. The explanation of these effects were attempted by considering the space charge distribution on the insulating paper. The trial to measure the space charge distribution was also made using an optical method. View full abstract»

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  • The Effect of Collision-Ionization Space-Charge on High Field Conduction in Solids

    Publication Year: 1980 , Page(s): 264 - 269
    Cited by:  Papers (9)
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    Calculations are presented for the high-field conduction characteristics of a simple dielectric model. The cathode is assumed to emit electrons following a Fowler-Nordheim law, and the anode blocks the emission of holes. The electrons are assumed to have a much greater mobility than the holes, and to be capable of causing collision ionization. The basic equations then permit computation of the steady state conduction characteristics. For sufficiently large current, the results show a region of negative resistance that depends significantly on the electrode geometry. Identification of the current-controlled instability with dielectric breakdown is beset with several severe difficulties. In the first place, significant collision ionization probably occurs in random bursts rather than in a steady, continuous manner. Secondly, the space charge associated with deep traps must contribute significantly to the field strength variation. A discussion is given of the way in which these complexities affect the problem in hand. View full abstract»

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  • Performance of HVDC Insulators under Contaminated Conditions

    Publication Year: 1980 , Page(s): 270 - 286
    Cited by:  Papers (11)
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    A review is presented on the performance of outdoor HVDC insulators in a polluting environment. Results from several recent studies have been included. Physical conditions and processes that lead to electrical breakdown are delineated. Both field and laboratory test results are presented to demonstrate the effects of ambient weather conditions and the contamination process on the flashover characteristics of an insulator. In particular, recent field test data from the Pacific HVDC Intertie has been included. Particle deposition mechanisms under the influence of electric field are also summarized. Lastly, leading theories pertaining to this field are reviewed. View full abstract»

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  • Polarity Effect Measurements Using the Kerr Electro-Optic Effect with Coaxial Cylindrical Electrodes

    Publication Year: 1980 , Page(s): 287 - 293
    Cited by:  Papers (6)
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    Steady state solutions of the electric field and space charge density distributions using a drift dominated unipolar conduction model between coaxial cylindrical electrodes are reviewed and compared to experimental results obtained using the Kerr electro-optic ptic effect. With coaxial cylindrical electrodes, Kerr measurements generally showed weak positive charge injection when the outer cylinder was positive and strong positive charge injection when the inner cylinder was positive. For one case study, positive charge injection at the inner cylindrical electrode was so strong that the space charge shielding caused the electric field at the inner cylinder to be a minimum, with the field increasing to the outer cylindrical electrode in complete contrast to the usual space charge free 1/r field dependence. This polarity effect is observed also for a sinusoidal ac high voltage with an essentially space charge free field when the inner cylindrical electrode was instantaneously negative, and a space charge distorted uniform field when the inner cylinder was instantaneously positive. View full abstract»

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  • Kerr Type Electro - Optic Effect in Solid Dielectrics

    Publication Year: 1980 , Page(s): 294 - 300
    Cited by:  Papers (3)
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    Electrically induced optical birefringence having a second power field dependence (Kerr effect) has been identified in common amorphous, transparent, dielectric materials such as PMMA, polyethylene, and cross-linked polyethylene. Using a He-Ne laser the relative phase retardation of light passing through an electrically stressed sample placed between crossed polarizers has been measured. An electrooptical coefficient of less than 0.1% of the Kerr coefficient in nitrobenzene has beenter-determined for PMMA samples. Even smaller values have been measured for PE samples. The measurements in PE are made for a range of temperatures in which the materials are transparent to visible light.ntri-Contributions from Maxwell stress towards the total observed effect have been determined independently. The measurement of substantial Kerr-type effect in PE is particularly significant as it makes possible a non-destructive technique of mapping electric fields around voids and inclusions within such polymeric insulation. View full abstract»

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  • Thermally Stimulated Characteristics in Solid Dielectrics

    Publication Year: 1980 , Page(s): 301 - 311
    Cited by:  Papers (17)
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  • Meetings

    Publication Year: 1980 , Page(s): 312
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Aims & Scope

This Transactions ceased production in 1993. The current retitled publication is  IEEE Transactions on Dielectrics and Electrical Insulation.

Full Aims & Scope