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


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.

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    IEEE transactions on dielectrics and electrical insulation
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Institute of Electrical and Electronics Engineers

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Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, we propose and design a novel generator for the high voltage square pulses with the changeable polarities in order to reach the requirements and the needs for the intended experiments on sterilization of microorganism. The major component of our circuits is a non-trivial combination between a half bridge Marx generator and an H bridge in series, combining with the DSP control unit, which can adjust the voltages, frequencies, pulse widths and polarities, and also tolerate various loads. More precisely, we illustrate the design and operation principles for each module in the constructed circuit and analyze the system performance with various loads. The effectiveness and correctness of our proposed circuit and methodologies have been verified and demonstrated by both PSIM simulation results and our own prototype. In this paper, we also show the stability and reliability of the pulse generator we proposed in terms of various load conditions and operation safety respectively. Furthermore, we also observe that the key parameters based on our constructed pulse generator can be easily adjusted which include voltages, frequencies, pulse widths and polarities. We hope that our work will stimulate the further investigations on design and analysis of pulse generators with a focus on modularization and miniaturization.
    IEEE Transactions on Dielectrics and Electrical Insulation 01/2015;
  • IEEE Transactions on Dielectrics and Electrical Insulation 12/2014;
  • IEEE Transactions on Dielectrics and Electrical Insulation 12/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: Models of one or several extremely simple transmission towers (pylons) are usually used for analyzing the influence of lightning strikes on power network. Models of more complex transmission towers with transmission lines, ground wires and even lightning channel are required. In this paper, first of all, the reason why one only focuses on the magnetic field at the observation points is briefly explained. Secondly, a method used to get the time-domain results from the frequency-domain results by Antenna Design Framework Electromagnetic Satellite (ADF¿¿EMS) software is established and its validity is proved. Thirdly, the effects of the lightning channels with different geometries are discussed. Finally, this paper comes up with a complex multi-tower system under the following fault types of lightning strikes, 1) direct lightning strikes to the edge phase wire without flashover, 2) direct lightning strikes to the edge phase wire with flashover, 3) lightning strikes to the top of the tower without flashover, and 4) lightning strikes to the top of the tower with back flashover. The magnetic field waveforms from these fault types are very important for the follow-up activity to achieve the fault type identification of lightning strikes in the observation system automatically.
    IEEE Transactions on Dielectrics and Electrical Insulation 08/2014; 21(4):1866-1874.
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    ABSTRACT: Ageing is strongly related to the external factors acting upon the polymer and to the manufacturing process. It mainly depends on the anti-ageing performance whether heat-shrinkable tubes for switchgear busbar can maintain excellent electrical and mechanical properties during the long term operation. In this paper, the collected samples were applied to the switchgear busbar of 10 and 35 kV in substations of Tianjin Power System. The 10 kV tubes have operated for one, two and nine years and 35 kV tubes for four and six years respectively. Besides, two more kinds of unused samples were chosen to compare with the aged ones. Dielectric permittivity, dissipation factor and AC impedance were tested to assess the extent of ageing. The breakdown characteristics under AC voltage and the trap distribution calculated by measuring the dynamic behavior of surface potential under DC voltage were obtained at room temperature. Moreover, the tests of tensile strength, including breaking strength and elongation at break, were performed to analyze the mechanical properties. Results show that dielectric permittivity and dissipation factor increase with the operating time while the tensile strength decreases. The decline of breakdown strength and AC impedance indicates that insulation capability is reduced by long time natural ageing. The results obtained from the investigation also show the correlation between the trap distribution and the dielectric strength with the operating time.
    IEEE Transactions on Dielectrics and Electrical Insulation 08/2014; 21(4):1875-1881.
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    ABSTRACT: Partial discharge (PD) diagnostic is considered as the main concern while making condition assessment plan for medium voltage assets. PD detection and localization in multi-section (straight and branched power lines) MV network is difficult by using the conventional Time Domain Reflectometry and Time Difference of Arrival methods. It is due to interconnected cables of different lengths and properties which make the interpretation of PD signals quite complex as compared to single cable routes. This paper presents an online technique of PD localization in MV cable network. PD activity emits current pulses propagating away from the PD site. Polarity of the detected PD pulses with reference to polarity of the supply voltage determines the direction of arrival of these pulses. Comparison of the polarity of PD pulses identifies the faulty section of the overhead covered conductor line as well as the cable network. The effect of power factor variation in real network scenario has been analyzed for true polarity comparison. Evaluation of direction of arrival is based on directionally calibrated sensor. Allocated induction sensors are employed along the feeder for integrated implementation of proposed technique in accordance with the distributed agent for improving the network reliability.
    IEEE Transactions on Dielectrics and Electrical Insulation 07/2014;
  • IEEE Transactions on Dielectrics and Electrical Insulation 06/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper investigates the influence of electrical as well as environmental stresses on surface erosion of polymeric materials used in high voltage insulation. The analyzed electrical stresses are applied voltage magnitude and frequency; whereas the environmental stresses of concern are temperature and humidity of air above sample surface. Suitable electrode arrangement is chosen in order to produce measurable erosion and guarantee the control of the analyzed stressing factors. Discharge intensity is defined by two parameters; total discharge energy and cumulative charge; whereas surface erosion severity is characterized by three quantities; surface eroded area, eroded volume and maximum erosion depth. Surface characteristics are obtained by a laser profilometer. From the obtained results a dependence of erosion severity on these stressing factors can be proven. A strong correlation between discharge intensity and material surface erosion is concluded.
    IEEE Transactions on Dielectrics and Electrical Insulation 06/2014; 21(3):1198-1206.
  • [Show abstract] [Hide abstract]
    ABSTRACT: The development of polymeric materials for outdoor insulation has been much aided by existing standard laboratory tests such as inclined-plane procedures. The position is less satisfactory in respect of the optimisation of insulator profiles and the choice of the minimum unified specific creepage distance (USCD) for a given site pollution severity (SPS). Standard tests currently under revision are stated to be ‘not directly applicable to polymeric insulators’. Such tests are therefore urgently needed to discriminate the pollution performance of silicone-rubber insulators of different housing materials and profiles, to quantify the inverse relationship of pollution severity and flashover voltage and to assess the influence of wetting rate. A suitable test strategy would also avoid housing damage from excessive flashovers. A new test procedure is presented here to achieve these objectives. This is not confined to flashover voltage measurements. A high-resolution data acquisition system is used to monitor and store the waveforms of the applied test voltage and leakage current throughout tests on 11kV silicone-rubber insulators. This enhancement provides a further basis for the quantitative comparison of insulators in artificial pollution testing, because the results corroborate the inverse relationship between flashover voltage and pre-flashover leakage current. Part 2 demonstrates the pollution performance of 11kV silicone-rubber insulators when surface texturing is used to increase USCD values.
    IEEE Transactions on Dielectrics and Electrical Insulation 04/2014; 21(2):740-748.
  • [Show abstract] [Hide abstract]
    ABSTRACT: The design principles and prototype manufacture of 11kV silicone-rubber composite textured insulators are described. The moulded surface texture increases the maximum creepage length from 375mm to 503mm for the four-shed profile used. The trunk sections of the insulator are patterned with a square-section array of hemispherical protuberances, and the shed undersides with interlaced logarithmic spirals of hemispherical ridges. Both textures are sufficiently shallow to facilitate fabrication, to allow effective washing and to avoid an increased salt deposit density (SDD) in artificial pollution tests. The test procedures which were developed in Part 1 of the paper are applied here to the textured prototypes. These procedures had been shown to quantify reliably the performance of conventional non-textured insulators of the same profile: the variation of flashover voltage and leakage current due to the silicone-rubber formulation, SDD and wetting rate could be measured. For textured insulators, it is found that the increased creepage distance improves the flashover voltage by up to 27%, with a corresponding reduction of pre-flashover leakage current. From comparative tests for two silicone-rubber formulations of different hydrophobicity and pollution performance, it is shown that surface texturing produces a parity of performance for both materials, and that this improvement is greatest for very severe pollution. This is particularly relevant to recent concerns expressed in IEC-TS 60815-3 (2008) relating to the selection and dimensioning of high-voltage a.c. polymeric insulators for use in heavily polluted conditions.
    IEEE Transactions on Dielectrics and Electrical Insulation 04/2014; 21(2):749-757.
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    ABSTRACT: The paper provides several methods to assess the condition of RTV coated porcelain/toughened glass insulators in the field. Visual observations of arcing and audible corona are the first indications that signal changes to the coating have taken place. It emphasizes that in the absence of reliable data one can use observations based on hydrophobicity to evaluate when maintenance or replacement of the coated insulators is necessary. Life extension strategies are suggested. It also demonstrates that there are differences in the hydrophobicity characteristics among commercially available coatings, and these can be quantified using standard laboratory techniques. Field experience suggests that the life of the RTV coatings can exceed 10 years even under the severest conditions of pollution.
    IEEE Transactions on Dielectrics and Electrical Insulation 02/2014; 21(1):253 - 261.
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    ABSTRACT: This paper presents electrical treeing behavior in low density polyethylene (LDPE) and cross-linked polyethylene (XLPE) after exposure to thermal and DC electro-thermal ageing. Both the ageing and the treeing tests were performed by means of two different types of test objects with wire-plane electrode geometry. One type of the tested objects contained only wire electrode of 10 µm diameter, whereas in the other type the wire electrode was attached through a semiconducting tab. The ageing was performed at 80°C with and without 10 kV DC voltage of both polarities connected to the wire and lasted up to 800 hours. The AC electrical treeing tests were applied afterwards for detecting changes of material properties after the ageing. The results showed that the electrical tree inception voltage consistently decreased with increasing time of thermal exposure, whereas the applied DC electric stress had a negligible effect on the observed behavior. Similar effects were found in both the tested materials (LDPE and XLPE) though the object type also influenced the results. For the objects with semiconducting tab, a higher level of the scale parameter was registered because of shielding effect of the tab on the electric field strength at the wire electrode. It also yielded less number of trees growing in parallel at the electrode. The dominant effect of thermal stress on the ageing of LDPE was elucidated by using various analytical techniques, like differential scanning calorimetry, infrared spectroscopy, inductively coupled plasma optical emission spectrometry and oxidation induction time, and it is believed to mainly affect antioxidant content in the test objects.
    IEEE Transactions on Dielectrics and Electrical Insulation 02/2014; 21(1):45-52.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Partial discharge (PD) is a key parameter which describes insulation condition of gas-insulated switchgear GIS, GIS internal defects can be discovered in time with the interferences such as corona discharge from the power system using Ultra-high frequency (UHF) method. Traditional method based on statistical characteristics is limited to the analysis of image features that describe the PD pattern plot, causing low recognition rate of some kinds of PD. In this paper, the acquisition of the PD characteristics caused by four typical insulation defects forms ϕ-v-n 3D PRPD pattern plots sample matrix. The largest Lyapunov exponent of each column of matrix is calculated. A 36-dimension vector is then obtained as the chaotic characteristics of the PD in different voltage phases. The experimental results show that the recognition method based on the chaotic characteristics performs well on all four kinds of insulation defects and can satisfy the recognition order. The method based on the chaotic characteristics has a strong recognition ability for the discharge physical models of gas gap, which is an advantage over the traditional method. The two recognition methods have a good complementary property. Combining the complementary chaotic and statistical characteristics in a decision-making level by using the Dempster-Shafer evidence theory results in an accuracy of above 98%.
    IEEE Transactions on Dielectrics and Electrical Insulation 01/2014; 21(2):783-790.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Vegetable oil is one of the alternatives to replace mineral oils in transformers. This paper focuses on oxidation stability assessment of a vegetable transformer oil under accelerated thermal aging at 110°C with various durations up to 2500 hours. Oil samples were aged under open condition to stimulate the oxidation process, as well as under sealed condition to provide a comparison. A number of parameters including acidity, DC conductivity, dielectric dissipation factor (DDF) and viscosity were measured to see their responses to oxidation process of the vegetable oil. The results showed that viscosity responds towards oxidation more than hydrolysis whereas acidity responds strongly to both oxidation and hydrolysis, since besides oxidation, hydrolysis of the vegetable oil also generates acid byproducts. Of more importance, oxidation stability, in the term of oxidation induction time (OIT), of thermally aged vegetable oils was investigated by using Pressure Differential Scanning Calorimetry (PDSC) method. As there was no standard on PDSC method available for vegetable oils, various measuring temperatures were tried and 130°C was found to be suitable for the investigated vegetable oil. The results showed that OIT of open samples decreases obviously with aging time until reaching the bottom plateau at 1000 hours, while OIT of sealed samples stays at a high level until the end of aging at 2500 hours. Therefore, OIT measured by using PDSC is appropriate to reflect oxidation stability of the vegetable oil. This was further confirmed by the corresponding consumption of antioxidant and generation of peroxides, dissolved decay products.
    IEEE Transactions on Dielectrics and Electrical Insulation 01/2014; 21(2):683-692.
  • [Show abstract] [Hide abstract]
    ABSTRACT: As an integral part of transmission lines, insulators play a major role in the reliability of power systems and their failure exposes the performance of the whole system into risk. Compared to AC systems, DC static field and corresponding arc without zero crossing makes DC flashover performance more problematic. Although the utilization of composite insulators in HVDC transmission lines continues to grow, there is still a lack of investigation on DC pollution flashover performance of SiR insulators especially at extra heavy pollution conditions. This paper presents the measurement and analytical results for DC flashover of SiR insulators in terms of different polarities of voltage, hydrophobicity levels and geometrical characteristics of SiR insulator at extra heavy pollution conditions. According to the results flashover strength in positive voltage is 4% higher than that in negative voltage. In addition, different profiles of SiR insulators did not show the same pollution flashover sensitivity on hydrophobicity. The empirical modeling of pollution flashover performance of insulators in terms of specific leakage distance, average diameter, form factor and the ratio of shed spacing to shed depth, revealed that specific leakage has the highest impact on pollution-flashover voltage gradient. This is of importance especially for designing and dimensioning of SiR insulators to be used under HVDC voltage.
    IEEE Transactions on Dielectrics and Electrical Insulation 01/2014; 21(2):721-728.
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    ABSTRACT: The dielectric behavior of an insulating material is commonly characterized by exposing its surface to a DC corona discharge for relatively short duration and then recording the decay of the electric potential Vs at its surface, Vs = f(t). The representation of the surface potential decay (SPD) by using tdVs/dt = f(log t) plots has already been used to perform a finer analysis of the dielectric response of film insulators. The present paper takes advantage of this peculiar way of representing the SPD in view of characterizing the dielectric behavior of fibrous electrets negatively-charged from a triode-type (wire-gridplate) electrode system. The experiments were performed in ambient air (temperature: 20 ± 1 ??C), at various values of the relative humidity (range 25 % to 65%). This paper reports experimental data collected on a polypropylene (PP) film (sheet thickness: 250 μm) and two types of PP non-woven media (fabric thickness: 300 μm), characterized by different fiber diameters (20 μm and 4 μm). The initial surface potential and the dynamics of SPD of fibrous dielectric materials were found to be affected by the corona charging conditions (relative humidity of the ambient air, grid voltage and grid current), as well as by the properties of the fibers and the structure of the non-woven media. An appropriate model of SPD should take into account charge injection from the media-electrode interface, charge transport controlled by bulk mechanisms and local high electric field effects due to the porous structure of the media.
    IEEE Transactions on Dielectrics and Electrical Insulation 01/2014; 21(2):829-835.

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