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: 1.23

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 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 1.42
Cited half-life 7.00
Immediacy index 0.13
Eigenfactor 0.01
Article influence 0.27
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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    • Publisher's version/PDF cannot be used
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  • Classification
    ​ green

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Interfacial tension (IFT) and acid numbers of insulating oil are correlated with the number of years that a transformer has been in service and are used as a signal for transformer oil reclamation. Oil sampling for IFT measurement calls for extra precautions due to its high sensitivity to various oil parameters and environmental conditions. The current used technique to measure IFT of transformer oil is relatively expensive, requires an expert to conduct the test and it takes long time since the extraction of oil sample, sending it to external laboratory and getting the results back. This paper introduces a new technique to estimate the IFT of transformer oil using ultraviolet-to-visible (UV-Vis) spectroscopy. UV-Vis spectral response of transformer oil can be measured instantly with relatively cheap equipment, does not need an expert person to conduct the test and has the potential to be implemented online. Results show that there is a good correlation between oil spectral response and its IFT value. Artificial neural network (ANN) approach is proposed to model this correlation.
    IEEE Transactions on Dielectrics and Electrical Insulation 09/2015; 22(2):1275-1282. DOI:10.1109/TDEI.2015.7076831
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    ABSTRACT: Electrical tree in silicone rubber (SiR) is a threat to the power system. Bedsides ac and dc voltage, there are pulse voltage in power system and the electrical tree behavior in SiR under pulse voltage has not been reported. In this paper, electrical treeing process in SiR under pulse voltage was investigated and analyzed. The voltage was applied to a needle-plate electrode to initiate electrical trees. The frequency of pulse voltage was 100, 200 and 300 Hz and the amplitude ranges from 8 to 14 kV. Aspects such as the patterns of electrical tree, tree length, accumulated damage, fractal dimension and tree breakdown characteristics were studied. Results indicate that the pulse amplitude plays the leading role in electrical tree initiation, propagation and breakdown processes. With the increase of pulse amplitude, the tree structure changes and the breakdown possibility increases obviously. However, the tree length is not sensitive to pulse frequency and higher pulse frequency promotes the increase of tree density. It also has been found that tree structure is closely related to pulse polarity and the inception voltage is lower with positive pulse than that with negative.
    IEEE Transactions on Dielectrics and Electrical Insulation 04/2015; 22(2):720-727. DOI:10.1109/TDEI.2015.7076767
  • IEEE Transactions on Dielectrics and Electrical Insulation 04/2015; 22(2):752-758. DOI:10.1109/TDEI.2015.7076772
  • IEEE Transactions on Dielectrics and Electrical Insulation 04/2015; 22(2):822-830. DOI:10.1109/TDEI.2015.7076781
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    ABSTRACT: Frequency response analysis (FRA) is a widely accepted testing technique to assess the mechanical condition of a power transformer. However, it has been reported that FRA is also sensitive to non-mechanical parameters such as the temperature and moisture content of the insulation. Therefore, further studies are required to investigate the ability of FRA on examining the transformer insulation condition. In this paper a study based on an insulation degradation of a single phase 5 kVA model transformer is presented. Throughout the accelerated insulation degradation process, FRA and Frequency Domain Dielectric Spectroscopy (FDS) measurements are performed to analyze the degradation condition. Two methodologies are proposed to analyze the FRA results based on the relative change of capacitance and change of inter-winding capacitance. Results obtained from these approaches are verified with FDS analysis.
    IEEE Transactions on Dielectrics and Electrical Insulation 04/2015; 22(2):1258-1265. DOI:10.1109/TDEI.2015.7076829
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    ABSTRACT: Current issues on localization algorithms based on the time difference of arrival (TDOA) for the partial discharge (PD) source include its sensitivity to time delay error, easy local convergence or divergence, and the large amount of computational load and time. A semi-definite relaxation method for PD source location to solve the time delay positioning equations is proposed in this paper, which using the semi-definite programming problem has the characteristic that can ensure obtained the global optimal solution. The proposed method converts nonlinear time delay equations into an equivalent semi-definite programming (SDP) problem by equivalent transformation and rank-1 relaxation firstly. Then use the interior point algorithm to solve the SDP problem that to obtain a unique global optimum solution, and extract a rank-1 component from the global optimal solution of relaxed SDP. Finally, to serve as a good approximate of the original problem for the PD location. The method was used to localize a measured PD source signal in the laboratory, and the results were compared with those of positioning by the Newton-iterative method. The comparison showed that the method can reduce sensitivity for the time delay error as well as effectively solve TDOA location equations, thereby ensuring that the result is a unique global optimal solution with high positioning efficiency. The localization algorithm problem is solved with the unavoidable and difficult-to-locate time delay error.
    IEEE Transactions on Dielectrics and Electrical Insulation 04/2015; 22(2):1097-1103. DOI:10.1109/TDEI.2015.7076811
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    ABSTRACT: The Rancimat method was used to evaluate the consumption of antioxidant additive in a natural ester insulating fluid (NEI). NEI samples were aged in the laboratory with and without oxygen bubbling. NEI samples were also collected from a transformer in operation. Samples of NEI (unused, aged in the laboratory and collected from transformer in operation) were analyzed by Fourier-transform infrared spectroscopy (FTIR) and by the Rancimat method for induction time (IT) measurement. The results showed that it is possible to evaluate the consumption of antioxidant additive in NEI in service by the Rancimat method. Laboratory tests were also performed to extend the lifetime of NEI in service by adding new loads of antioxidant additive. The results showed that the addition of new antioxidant additive loads when the IT of in-service NEI (determined by Rancimat method) reaches about 3 h extends the lifetime of this oil.
    IEEE Transactions on Dielectrics and Electrical Insulation 04/2015; 22(2):864-868. DOI:10.1109/TDEI.2015.7076786
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    ABSTRACT: In this paper, the design, installation, and performance of a ??100 kV gas switch for linear-transformer-driver (LTD) are presented. LTD demands require gas switches that can be operated at a 200 kV DC voltage, and require trigger jitter and inductance as small as possible. A field distortion switch has been designed based on the L3 switch, the design criteria of switch electric field and trigger system are explained in detail. A two dimensional plasma model is developed to analyze the contribution of trigger system to the closing of gas switch. An experimental platform was built to test the self breakdown and triggered breakdown characteristics of the switch. When the switch is charged to ??100 kV and is triggered by a -120 kV pulse with a 30 ns rise time, the delay time is 78 ns and the jitter is 1.6 ns. A comparative test was done to research the function of UV preionization gap, the test results shown that the UV preionization gap can reduce the switch delay time and jitter, it can effectively improve the trigger performance of the switch. Meanwhile, using the short-circuit discharge, the inductance and impedance were measured, the switch inductance is about 30 nH, and the impedance is varied from 50mΩ to 30mΩ.
    IEEE Transactions on Dielectrics and Electrical Insulation 04/2015; 22(2):1292-1297. DOI:10.1109/TDEI.2015.7076833
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    ABSTRACT: Polytetrafluoroethylene (PTFE) has been widely used in insulation equipment and high voltage apparatus due to its excellent insulating property. However, electrical aging phenomenon of PTFE may cause insulation failure under nanosecond pulses. Temperature is an important parameter that influences the electrical aging process. This paper investigated the effect of temperature on the electrical aging characteristics of PTFE under nanosecond pulses. A nanosecond pulse generator MPC50D based on magnetic pulse compression was used. The output voltage has a rise time of 30 ns and a full width at half maximum of 70 ns. The needle electrode was adopted to accelerate the aging process. The testing chamber SP-80U was used to control the temperature and humidity. The experimental results showed that the inception voltage increased and the speed of the aging process decreased when the temperature decreased. The effects of the pulse repetition rate and the impacting mechanism of temperature on electrical aging characteristics were also discussed.
    IEEE Transactions on Dielectrics and Electrical Insulation 04/2015; 22(2):1171-1175. DOI:10.1109/TDEI.2015.7076819
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    ABSTRACT: Switching transients and earth faults may lead to resonant overvoltages at wind turbine transformer terminals as well as inside High Voltage (HV) and Low Voltage (LV) windings. The winding design in a transformer could strongly influence the internal voltage distribution as function of frequency, and this has a great impact on risk of insulation failure. In this paper, resonant overvoltages in three winding designs; layer, disc and pancake, are investigated and analyzed for the application in offshore wind farm. To achieve this, a prototype 500 kVA transformer with the three winding types on the HV side and taps for voltage measurements is designed and produced. The measurements show that a HV winding of layer type gives the highest transferred voltage to the LV terminal and that this happens at 1.6 MHz which could be excited for close-up earth faults. Although disc winding seems the least vulnerable when measuring the transferred voltage to the LV terminal, it has higher potential of internal resonances in the HV winding compared to the two other types both voltage-to-ground and voltage drops. Pancake and layer windings have less vulnerability in the case of internal resonances. Pancake windings have modular design characteristic. This advantage eases the repair for offshore wind applications.
    IEEE Transactions on Dielectrics and Electrical Insulation 04/2015; 22(2):1250 - 1257. DOI:10.1109/TDEI.2015.7076828
  • IEEE Transactions on Dielectrics and Electrical Insulation 04/2015; 22(2):1176-1185. DOI:10.1109/TDEI.2015.7076820
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    ABSTRACT: During the field service of composite insulators, high temperature vulcanized (HTV) silicone rubber (SIR) material used for insulator???s sheath and sheds is gradually aging, and thus how to effectively evaluate its aging state has become an inevitable issue. In this paper, artificially corona-aged and naturally site-aged SIR materials are employed as samples, and their properties such as hydrophobicity, leakage current, trap density/energy level, surface microstructure and chemical composition are investigated for comparative study. With the increasing of corona aging intensity, the contact angle of SIR samples drops gradually and recovers more slowly. The hydrophobicity of site-aged insulators also declines, from HC1 for 2-year service to HC5 for 15-year service. The leakage current of corona-aged and site-aged samples both increase with aging, which indicates that aging induces the increase of surface conductivity of SIR material. The peak trap density of corona-aged and site-aged samples increases with the aging duration or service duration remarkably. The changes of these properties are attributed to the changes of micro-structures and compositions in the surface layer of SIR. The scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS) analysis results reflect that a hardened inorganic silica-like (SiO2) layer with many polar chemical groups and distributed micro-pores is formed on the surface of SIR material after corona aging. Because of this silica-like layer, the hydrophobicity decreases while surface conductivity and trap density of SIR material increases. Besides the traditional properties like hydrophobicity and surface conductivity, the trap density is expected to be a novel parameter for effective evaluation of aging state of HTV silicone rubber material.
    IEEE Transactions on Dielectrics and Electrical Insulation 04/2015; 22(2):961-969. DOI:10.1109/TDEI.2015.7076797
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    ABSTRACT: The energized icing tests for five kinds of 220 kV composite insulators with and without the grading ring (GR) at the high voltage (HV) end are performed in the artificial climate chamber. Combining with the numerical simulations of electric field (E-field), the differences between the influence of GR and shed configuration on the ice characteristics and flashover performance of composite insulators are compared and analyzed. Results indicate that GR can improve both the ice growths and E-field distributions near the HV end. The improvements of GR on the icing flashover voltages under light icing degree is relatively obvious, while with the increase of icing degree, these effects gradually become less apparent. For different insulators, the effects of icing degree on icing flashover voltages under the presence of GRs are all higher than that under the absence of GRs. Moreover, the influence law of icing degree among different insulators remains unchanged under the presence and absence of GRs. In general, the improvement of optimized shed configuration for the icing flashover performance is more obvious than that of GR, which can be considered as one main measure to improve insulation performance of composite insulators in ice regions.
    IEEE Transactions on Dielectrics and Electrical Insulation 04/2015; 22(2):951-960. DOI:10.1109/TDEI.2015.7076796
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    ABSTRACT: This paper aims to investigate time-domain characteristics of the audible noise caused by single corona source under positive corona discharge. The obtained time-domain waveform of the audible noise consisted of a series of bipolar sound pressure pulses. After the background noise was successfully removed, the characteristics of audible noise pulses, such as amplitudes of each pulse, pulse rate and apparent duration time, were analyzed in this paper. Using the applied voltage and the onset voltage as variables, empirical formulas were derived from the measured results to predict the pulse rate and the amplitudes of the pulses. Furthermore, a typical waveform in the form of segmented double exponential function was developed to simulate the audible noise pulse. The rationality of the typical waveform was confirmed both in time domain and in frequency domain. Finally, some qualitative explanations for the generation of the bipolar pulse waveform of audible noise were given. Based on the remaining space charges characteristics, the influences of the applied voltage on the amplitude and pulse rate of the audible noise pulses were studied qualitatively.
    IEEE Transactions on Dielectrics and Electrical Insulation 04/2015; 22(2):870-878. DOI:10.1109/TDEI.2015.7076787
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    ABSTRACT: A method of predicting the residual breakdown electrical field strength of an epoxy-mica paper insulation system is described. This method was developed by using data on service???aged stator bars from generators as well as accelerated aging model bars. Thermal aging, mechanical aging, and combined thermal and mechanical aging were done individually as accelerated aging. The partial discharge characteristics, dissipation factor, and breakdown voltage were measured on the model bars and service???aged bars from generators. From these results, the residual breakdown electrical field strength was predicted based on the partial discharge characteristics and dissipation factor. First, the dominant type of deterioration (thermal or mechanical aging) on a bar???s insulation was determined by the pattern of voltage???partial discharge magnitude characteristics. Then the residual breakdown electrical field strength was predicted by using a predicting equation for both thermal and mechanical aging. Each predicting equation uses dissipation factor tip-up (i.e. difference in dissipation factor values between 2 kV and rated voltage) and partial discharge inception electrical field strength. The accuracy of this method was confirmed using data measured on 112 service-aged stator bars from generators and 10 accelerated aged model bars. The 95% confidence interval level included 94% of the measured residual breakdown electrical field strength values. This result shows that the method enables precise predictions of the residual breakdown electrical field strength of an epoxy-mica paper insulation system.
    IEEE Transactions on Dielectrics and Electrical Insulation 04/2015; 22(2):1118-1123. DOI:10.1109/TDEI.2015.7076813
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    ABSTRACT: Damage to 500 kV surge arresters occurred due to direct and multiple lightning strokes. The present paper initially analyzes the mechanism of how the surge arresters were damaged based on the accident investigative results and evaluates the energy absorption capacity of existing surge arresters by analyzing the energy absorbed when the surge arresters were damaged. Consequently, the damage was confirmed as attributable by the crack of ZnO elements due to the thermal stress sustained when absorbing the energy of direct and multiple lightning strokes. The damage energy was estimated at about 5.4 MJ. Subsequently, based on the lightning observation data according to the lightning location system and the lightning outage rate of transmission lines, the standard lightning-stroke conditions were determined, the required energy absorption capacity of the surge arresters was analyzed and determined to be less than 5.3 MJ. Although the energy absorbed in the above damage cases exceeds this required energy absorption capacity, it is still considered within the variable range of lightning events. Consequently, existing surge arresters have the required energy absorption capacity and the cases involving damage to surge arresters are considered extremely rare.
    IEEE Transactions on Dielectrics and Electrical Insulation 04/2015; 22(2):916-924. DOI:10.1109/TDEI.2015.7076792