IEEE Transactions on Dielectrics and Electrical Insulation (IEEE T DIELECT EL IN)

Publisher: Institute of Electrical and Electronics Engineers; IEEE Dielectrics and Electrical Insulation Society, Institute of Electrical and Electronics Engineers

Journal description

Electrical insulation common to the design and construction of components and equipment for use in electrical and electronic circuits and distribution systems at all frequencies.

Current impact factor: 1.28

Impact Factor Rankings

2016 Impact Factor Available summer 2017
2014 / 2015 Impact Factor 1.278
2013 Impact Factor 1.228
2012 Impact Factor 1.36
2011 Impact Factor 1.094
2010 Impact Factor 1.47
2009 Impact Factor 0.848
2008 Impact Factor 1.037
2007 Impact Factor 0.792
2006 Impact Factor 0.771
2005 Impact Factor 1.124
2004 Impact Factor 0.872
2003 Impact Factor 0.584
2002 Impact Factor 0.86
2001 Impact Factor 0.778
2000 Impact Factor 0.643
1999 Impact Factor 0.5
1998 Impact Factor 0.645
1997 Impact Factor 0.8
1996 Impact Factor 0.348
1995 Impact Factor 0.431

Impact factor over time

Impact factor

Additional details

5-year impact 1.55
Cited half-life 7.20
Immediacy index 0.11
Eigenfactor 0.01
Article influence 0.31
Website IEEE Transactions on Dielectrics and Electrical Insulation website
Other titles IEEE transactions on dielectrics and electrical insulation
ISSN 1070-9878
OCLC 28524935
Material type Periodical, Internet resource
Document type Journal / Magazine / Newspaper, Internet Resource

Publisher details

Institute of Electrical and Electronics Engineers

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  • Classification

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: The paper concerns the case study of a group of oil power transformers in which, on the basis of the measurements of concentration of gases dissolved in oil, excessive generation of hydrogen was noticed. Analysis performed using the ratio method proposed by IEC 60599 standard, and the Duval triangle method, identified partial discharge (PD) generation in the transformer units considered. Deepened analysis indicated however that such a diagnosis may be false and excessive hydrogen generation is a result of stray gassing. Additional studies such as the measurements of partial discharge intensity using acoustic emission method as well as internal inspection and factory tests (including PD measurements using electrical method) of selected units seem to confirm this hypothesis. However, taking into account the recommendations described in CIGRE brochure 296, lack of compatibility of constructional materials with the oil used in the analyzed group of transformers is also probable. Finally, this may be concluded that assessment of the results of the DGA needs to be carried out carefully when an increase in the concentration of hydrogen in the transformers in service is observed. An unambiguous determination of the cause of the fault cannot be indicated only on the basis of basic analysis. Some other, more specific analyses and tests should be used.
    No preview · Article · Dec 2016 · IEEE Transactions on Dielectrics and Electrical Insulation
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    ABSTRACT: IEEE Std. 516-2009 and IEC 61472-2013 present Minimum Approach Distance (MAD) requirements for tools to perform live maintenance safely, provided that the tool has no continuous film of moisture or measurable contamination present on its surface. However, four separate “clean” FRP hot-stick flashover incidents occurred in Canada under steady-state system conditions at the peak of the voltage negative half-cycle during cold and freezing conditions. This paper investigates IEC and IEEE methods of calculating MAD for tools employed for live working done on the geometry of the Manitoba site incidents at 500-kV. Based on cold fog tests carried out at CIGELE to reproduce these incidents, guidelines for calculating MAD in cold and freezing climate regions are proposed.
    No preview · Article · Feb 2016 · IEEE Transactions on Dielectrics and Electrical Insulation

  • No preview · Article · Feb 2016 · IEEE Transactions on Dielectrics and Electrical Insulation
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    ABSTRACT: Wetting of a pollution layer by mist or light rain is inhibited, in the case of silicone rubber (SiR) insulators, by the migration of hydrophobic polymeric chains from the insulator to the layer surface. However, recent laboratory fog-chamber tests have shown that a salt/kaolin layer applied to the surface of an 11kV SiR insulator can reduce the specific creepage distance (SCD) at flashover to as low as 16mm/kV. Even for larger values of SCD, potentially damaging partial arcs can arise along the insulator surface. It has been shown that some mitigation of partial-arc activity and an increase of flashover voltage can be achieved by appropriate texturing of the SiR insulator housing. The present paper describes additional infrared (IR) recording which accompanied these previous tests. Although a reduction of the flashover voltage in polluted environments is generally surmised to be the result of the formation of dry bands in a conducting moistened surface layer, no direct observations of dry bands appear to have been previously demonstrated in the laboratory. Such observations are described here, where details of dry-band location and growth are revealed by IR recording. Dry bands are shown by close-up visual photography to be invariably bridged by small streamer/spark discharges which maintain current continuity in the pollution layer. Local surface heating by these discharges are the probable cause of the delayed rewetting of the bands. Partial-arc channels that may result in flashover develop from and across the dry-band streamers. It has become clear that clean-fog testing with infrared recording and leakage current measurements provide new possibilities for the modeling of dry band discharges and improvement of insulator design.
    No preview · Article · Feb 2016 · IEEE Transactions on Dielectrics and Electrical Insulation
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    ABSTRACT: Recently it was shown that it is possible to predict the breakdown voltages of arbitrary electrode configurations under standard voltage applications for electron attaching gases with a stepped leader model originally proposed for SF6. In this contribution this model was applied to the hydrofluoroolefin HFO1234ze. The parameters, which are necessary for the modeling, are derived from measurement of statistical and formative time lags in an electrode configuration with a homogeneous background field with a small protrusion. The parameters are used to predict the breakdown voltage for technical relevant geometries and standard voltage wave shapes. To verify these predictions, breakdown experiments in nearly homogeneous and strongly inhomogeneous field configurations with AC and lightning impulse voltage application of both polarities were performed. The hydrofluoroolefin exhibits insulation properties which are quite similar to those of SF6. Therefore it could be considered as admixture for high voltage gaseous insulations or as replacement in medium voltage equipment. For applications using the pure gas the temperature and pressure range has to be limited to prevent liquefaction. The good match between the simulations and the experiments gives evidence that the model can be applied to a broad range of other novel electron attaching gases as well.
    No preview · Article · Dec 2015 · IEEE Transactions on Dielectrics and Electrical Insulation
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    ABSTRACT: The performance and reliability of the electric power systems can be enhanced with the development of new polymer formulations, offering new concepts in equipment housing design and application. This paper reports the electrical and physicochemical properties of plasticized formulations based on HDPE, developed specifically for surge arresters housings. Plasticized HDPE surge arrester housings, 15 kV, were manufactured at ISO-9001 by one-shot injection molding technique. HDPE housed surge arresters were submitted to performance tests according to IEC 60.099-4 and exposed to artificial electrical aging tests and then physicochemically and electrically characterized. The physicochemical characterization comprised analysis by Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), wide-angle X-ray diffraction (WAXRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and contact angle measurements. The FTIR results confirm the microstructural modifications of the aged HDPE due to oxidation phenomena, probably involving the formation of alcohol or carboxylic groups at surface level of surge arresters housings. The DSC technique shows no significant variation of the HDPE amorphous and crystalline content as a function of the electrical aging conditions. The TGA kinetics analysis shows significant changes in the activation energy for thermal degradation of the electrical aged and unaged HDPE surge arresters housings. The results obtained have demonstrated that the plasticized HDPE formulation has good stability at high electrical field and appears to be suitable for use in manufacturing surge arresters housings.
    No preview · Article · Dec 2015 · IEEE Transactions on Dielectrics and Electrical Insulation
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    ABSTRACT: The application of vibration-based condition monitoring methods to power transformers has shown the potential for detecting mechanical transformer failures. The ageing of winding insulation paper, which is a common problem in long-serving power transformers, affects both the electrical and mechanical strength of the windings. This paper is concerned with the vibration features of winding disks with aged insulation paper. The vibration characteristics of single-layer winding disks wrapped with insulation paper are investigated. By examining the vibration frequency responses of winding disks with different degrees of ageing of insulation paper, the effects of aged paper on the vibration behaviors of winding disks are demonstrated. The experimental results show that changes in the vibration responses of winding disks can be related to the ageing of insulation paper, and thus it is possible to detect this failure mode in a power transformer using a vibration-based method. A qualitative explanation for these changes is presented, using the degradation of the mechanical strength of the insulation paper.
    No preview · Article · Dec 2015 · IEEE Transactions on Dielectrics and Electrical Insulation
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    ABSTRACT: Oil soluble chemical markers such as methanol, ethanol and 2-furaldehyde for assessing the condition of insulating paper still present many challenges for an accurate interpretation in real transformers. Indeed, many conceptual parameters such as design (shell vs. core) or type of cooling are needed for a more accurate interpretation of the data. Moreover, similarly to water, the measured marker concentrations in oil are temperature-dependent, i.e. an existing partition phenomenon between the oil and the solid insulation modify the solubility of the markers, thus changing their apparent concentrations in the oil. Consequently, to follow the real trend of these species during the transformer???s service life, it is crucial to correct their concentrations at a specific temperature, as is done for the water content. Knowing these facts and in order to calibrate a predictive model, Hydro-Qu??bec decided to access equipment when dismantled, which enables a large amount of paper to be sampled from different sections of the windings. This allows for a more accurate representation of the transformer paper conditions in relation to transformer design. The paper condition obtained by measuring the degree of polymerization in accordance with the presence of chemical markers is a valuable process. We believe that it is possible to better understand the behavior of the paper insulation and to assess markers concentration thresholds using the oil analysis. This article discusses the recent experience in this field with specific cases.
    No preview · Article · Dec 2015 · IEEE Transactions on Dielectrics and Electrical Insulation
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    ABSTRACT: In the recent decades, the phenomena of space charge accumulation in the high voltage direct current (HVDC) insulation have been attracted more attention. In this paper, low density polyethylene (LDPE) nanocomposites filled with alumina nanoparticles (nano-Al2O3) were prepared employing melting blend method. Morphologies of nanoparticles and LDPE/Al2O3 nanocomposites were performed by scanning electron microscopy (SEM). Electrical properties of the LDPE nanocomposites were also investigated. Results shown that the nano-Al2O3 particles modified with vinyl silane coupling can effectively enhance the breakdown strength of LDPE nanocomposites. With the nano-Al2O3 particles loading, the volume resistivity of the LDPE nanocomposites was increased, while dielectric permittivity of the nanocomposites was decreased. Space charge of the LDPE nanocomposites was measured by pulsed electro-acoustic (PEA) method. The charge profiles indicated that space charge suppression of the LDPE nanocomposites was better than that of pure LDPE. The excellent insulation properties of the LDPE nanocomposites were attributed to the better interfacial adhesion between the surface-treated nano-Al2O3 particles and the LDPE matrix.
    No preview · Article · Dec 2015 · IEEE Transactions on Dielectrics and Electrical Insulation
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    ABSTRACT: This paper reviews results of partial discharge measurements and accelerated life tests performed on models of random and form wound insulation systems subjected to impulse voltage waveforms. The goal is to highlight how the features of the supply voltage affect the partial discharge activity and how this, eventually, reflects on the endurance of the insulation system. The most salient results are that, for both types of insulation systems, short rise times trigger PD of large magnitude, which are able to erode the insulation system faster than the partial discharges incepted using waveforms with longer rise times. In particular, failure times estimated by tests under sinusoidal voltages can be overly optimistic in assessing the long-term behavior of the insulation system subjected to impulse voltage waveforms. Frequency also is very important, as it controls the interplay between physical and chemical degradation rates. As a result, above partial discharge inception voltage the frequency acceleration rule does not hold, and can lead therefore to excessively optimistic results.
    No preview · Article · Dec 2015 · IEEE Transactions on Dielectrics and Electrical Insulation
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    ABSTRACT: This paper refers to the bubble effect in transformer bushings. The bubble effect consists in releasing water from moistened cellulose insulation after exceeding a critical temperature. The most dangerous result is a pressure increase that leads to an explosion and fire. Research was conducted using laboratory models of OIP (Oil- Impregnated Paper) and RBP (Resin-Bonded Paper) types of bushings immersed in mineral oil and synthetic ester. For all of the investigated systems we determined the dynamics of water adsorption upon contact of the insulating material with air and the temperature characteristics of bubble effect initiation depending on water content in cellulose. In the experiment we investigated the dynamics of changes of water content in dielectric liquid, water content in air over the surface of the dielectric liquid, and air pressure over the surface of the dielectric liquid. In the future, the technical possibilities will be analyzed of using the dynamic changes of the three quantities investigated here to detect the bubble effect in bushings.
    No preview · Article · Dec 2015 · IEEE Transactions on Dielectrics and Electrical Insulation
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    ABSTRACT: This study focuses on absorption and permeation of deionized water and typical aqueous solutions of high-temperature vulcanized (HTV) silicone rubber (SR). The influences of some parameters, such as, filler (fumed silica and aluminum hydroxide) characteristics, solution concentration, temperature, and tensile stress on absorption of water/solution were investigated. Results indicate that tensile stress accelerates water and solution uptake of HTV SR. The dependence of water and solution permeation coefficients of HTV SR on two important parameters, i.e., filler characteristics and the HTV SR sample thickness, were investigated. Permeation coefficient was found to be inversely proportional to SR thickness. The possible influencing mechanism of tensile stress on water and solution absorption and that of filler characteristics on water absorption and permeation were discussed. Moreover, the free volume, which is filled by the absorbed water, plays an important role in water absorption and permeation.
    No preview · Article · Dec 2015 · IEEE Transactions on Dielectrics and Electrical Insulation
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    ABSTRACT: A modular double gap pseudospark discharge based switch has been recently designed and developed for various pulsed power applications. The modular pseudospark geometry has two gaps that are separated by a cavity drift space region. It employs a single trigger unit in the cathode region to initiate discharge for the rapid breakdown of both the gaps. Successful experiments for the double gap pseudospark with typical coaxial arrangement of multichannel discharges were performed. The peak discharge currents at breakdown voltage of about 40 kV were 5 and 10 kA through resistive loads of 5.25 and 2.7 Ω, respectively. The design of the double gap pseudospark along with switching results is presented in this paper.
    No preview · Article · Dec 2015 · IEEE Transactions on Dielectrics and Electrical Insulation
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    ABSTRACT: Corona and spark are two typical discharge types in gas-insulated switchgear (GIS). Studies on the SF6 decomposition characteristics under corona and spark are significant for the safe operation of the GIS. In this paper, the discharge energy/charge and SF6 decomposition products under ac corona with point-to-plane electrode defect and spark with floating potential defect were investigated under different electrode dimensions, applied voltages, SF6 gas pressures, adsorbents and moisture contents. The upper limit of the formation rates, feature extraction, and the amount of wear of the GIS were also discussed. The results show that the influences of gas pressure and moisture content on the discharge energy and SF6 decomposition products under two different defects are distinguishable. In addition, the concentration ratios of (SOF2+SO2)/(SO2F2) under corona and spark lie in the ranges, 0-1, and 1???5, respectively. The formation rates of SF6 decomposition products calculated from experimental results under corona discharge lie in the range, 0.1-5 μmoles/J. However, the formation rates under spark are usually in the range, 0.02-0.04 μmoles/J, which are far lower than that under corona. Theoretically the upper limit of the formation rates under corona and spark are estimated to be in the ranges, 67-540 μmoles/J, and 188- 376 nmoles/J respectively. Besides, the concentration ratios and formation rates can be used to distinguish the discharge types and the amount of wear of the GIS can be estimated.
    No preview · Article · Dec 2015 · IEEE Transactions on Dielectrics and Electrical Insulation
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    ABSTRACT: The condition of the electrical insulation frequently defines the useful life of the windings of rotating machines. Strategies to maximize lifetime start with the specification and are followed by various quality control and reliability measures during manufacture, installation and during operation.
    No preview · Article · Dec 2015 · IEEE Transactions on Dielectrics and Electrical Insulation
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    ABSTRACT: We report the role of Gd2O3 substitution on the dielectric properties of alkali niobate K0.5Na0.5NbO3 (KNN) ceramics. This system exhibits relaxor behaviour for 0.5 wt% of Gd2O3 in KNN matrix and shows enhanced dielectric permittivity (εr = 4147 at T = 628 K) and low loss (Tanδ ~ 0.008) at frequency f = 1 MHz. The position of crystallographic phase transitions of Orthorhombic to Tetragonal (T1) and Tetragonal to Cubic (T2) shifts significantly from 480 K to 413 K and 668 K to 582 K, respectively. The temperature and the frequency dependence of the position of maximum dielectric permittivity Tm obeys the Vogel???Fulcher law, with the attempt frequency f0 = 5.32??1011 Hz, freezing temperature Tf = 598 K and activation energy EA= 0.038 eV for KNN + 0.5 wt% Gd2O3. The temperature dependence of AC-conductivity σac (T) analysis in the range 300 K < T < 600 K reveals the existence of variable range hopping of charge carriers with average hopping length RH in the range 7.93-29.24 nm and 5.55-26.41 nm for ξ = 0 and ξ = 0.5, respectively. The diffuseness exponent ???γ??? (~1.74) estimated from the high temperature slopes of the diffused dielectric permittivity data reveals the weakly coupled relaxor behavior.
    No preview · Article · Dec 2015 · IEEE Transactions on Dielectrics and Electrical Insulation