IEEJ Transactions on Power and Energy
Online ISSN : 1348-8147
Print ISSN : 0385-4213
ISSN-L : 0385-4213
Volume 133 , Issue 11
Showing 1-29 articles out of 29 articles from the selected issue
Special Issue on Switching and Protecting Technologies
Preface
Special Issue Review
  • Hajime Urai, Norimitsu Kato, Masatomo Ono, Toshimasa Maruyama, Masayuk ...
    2013 Volume 133 Issue 11 Pages 794-798
    Published: November 01, 2013
    Released: November 01, 2013
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    Switching and protection equipment in electric power transmission and distribution systems, such as circuit breakers, surge arresters, and switchgear, are essential components for the stable supply of electricity. The demands on the equipment, for example, low maintenance cost, long life, and environmental friendliness, have been growing. Development trends in switching and protection technology applied to gas insulated switchgear, gas circuit breakers, electric power distribution equipment, medium voltage switchgear, and surge arresters are reviewed in this paper.
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Special Issue Paper
  • Chaowat Apisit, Atthapol Ngaopitakkul
    2013 Volume 133 Issue 11 Pages 799-805
    Published: November 01, 2013
    Released: November 01, 2013
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    In the literature for fault location, most of research works have never been mentioned about effects of simultaneous faults. This paper presents a new decision algorithm that will be developed in order to predict precisely fault location, during simultaneous fault, in an underground distribution system using discrete wavelet transform (DWT). The advantage of the DWT is that the band of analysis can be fine adjusted so that high frequency components and low frequency components are detected precisely, consequently DWT is considered herein. The fault signal is simulated using ATP/EMTP. The DWT is used to detect the high frequency components. Coefficients of positive sequence current signals are calculated. The positive sequence current as extracted to several scales with the DWT, and the coefficients of the first scale from the DWT are investigated. The time that the fault signal uses to reach the ends of the distribution line is considered, then, applied so that the distance of fault can be calculated. Various case studies have been carried out including the single fault and simultaneous fault. The result is found that the proposed algorithm gives satisfactory both in case of single fault and simultaneous fault.
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  • Shinya Watanabe, Kentaro Kokura
    2013 Volume 133 Issue 11 Pages 806-817
    Published: November 01, 2013
    Released: November 01, 2013
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    In this study, (i) effect of deion plates on arc voltage and (ii) appropriate arrangement of the plates were investigated in order to develop a design guide of a circuit breaker which is able to interrupt fault current (> several kA). As for evaluation (i), improved effect on arc voltage under arrangement of the plates were evaluated quantitatively in association between arc voltage and the design factors which are current, arc length, internal pressure and number of the used plates. As the result, it was found that arc voltage rises 19.2V by number of split arc between the plates and electrical field in arc rises about 3V/mm under high internal pressure above 0.2MPa-g. Experimental formula constituted by the design factors for estimation of arc voltage was developed on the basis of the improved effect on the voltage. Since the formula is able to estimate actual arc voltage with a margin of error within about 7%, it would be provided as effective guidelines to design arc extinguishing chambers. As for evaluation (ii), dependences of the availability of used plates on electromagnetic force to drive arc were evaluated. As the result, it is found that the plates are used effectively by exerting above a certain electromagnetic force (e. g., above 5N in case of 5kA) on the arc between the electrode and the plate. Therefore, the improvement of magnetic design near the electrodes, especially the movable electrode, or the arranging enough space to drive the arc between the electrode and the plate would be improved availability of the used plates.
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  • Yasunobu Yokomizu, Toshiro Matsumura, Motohiro Sato, Katsuhiko Horinou ...
    2013 Volume 133 Issue 11 Pages 818-825
    Published: November 01, 2013
    Released: November 01, 2013
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    Regarding SF6-CO2 mixture gases, the equilibrium compositions in a temperature range from 300 to 30,000K at 0.6MPa were calculated to find out predominant particles with high number densities. Eighty-five particles, including 47 neutral molecules originating from SF6 and CO2, were taken into account as the component species. At the temperatures T of about 7,000K or above, S, F, C, O, their positive ions and electrons are present as the predominant particles, for almost all of the CO2 concentration, XCO2 . Not only SF, SF2, CO and CO2 but also SO and SO2 behave as the predominant particles in the temperature range from 3,000 to 7,000K, almost independent of XCO2. On the contrary, the predominant particles in the temperature range from 300 to 3,000K distinctly depend on XCO2. By way of example, for the gas of XCO2=0.1, three particles SF6, SO2F2 and CF4 have the high number densities at T below 1,000K. By way of another example, particles CO2, SO2F2, CF4 and CO2F2, for XCO2=0.6, shows the high number densities at T below 1,000K. On the basis of these results, the predominant particles present after an arc extinction are discussed as a function of XCO2.
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  • Tadashi Koshizuka, Kietsu Kudo, Tetsuya Nakamoto, Eiichi Haginomori, K ...
    2013 Volume 133 Issue 11 Pages 826-831
    Published: November 01, 2013
    Released: November 01, 2013
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    The prospective transient recovery voltage (TRV) at current interruption for circuit breakers should be measured by using ideal circuit breaker. Prospective values of the TRV are obtained by drawing tangential line to the TRV waveform. But, it is difficult to draw the tangential line on the four parameters TRV waveform automatically by computer software.
    This paper shows the new method to draw the tangential line on the four parameters TRV waveform. It is easy to draw the tangential line on the TRV waveform by simple waveform transform process. This method is easy to code to the computer software. Also, it was investigated to decide the current zero at prospective TRV measurements.
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  • Toshihiro Maekawa, Hiroaki Kagawa, Kojiro Aoki, Yoshibumi Yamagata, Mi ...
    2013 Volume 133 Issue 11 Pages 832-842
    Published: November 01, 2013
    Released: November 01, 2013
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    High-Speed Earthing Switches (HSES) featuring fast extinction of secondary arcs for EHV/UHV class high-voltage transmission lines were firstly introduced in BPA's 500kV transmission lines in US. The equipment were also applied in Korea's 765kV transmission lines, which technology was developed based on 1990's UHV (Ultra High Voltage) system studies and field test carried out by TEPCO, Japan. For establishing an international standard on HSES, there were several technical issues that need to be addressed. Interrupting duties for the HSES vary depending on the system requirements; such as the system voltage, distance to the adjacent lines, the current flowing in neighboring phases, the parallel line lengths, reclosing scheme, number of circuits on the same tower, the faults conditions and so on. PT48 was established in IEC SC17A in 2009 which was succeeded by WG48 in 2010, and the organization has been working continuously for establishing an international standard on HSES. The aim of this paper is to introduce the technical considerations and prospects for standardization of the HSES as a result of the analyses of the requirement for the HSES system which was conducted by mostly SC17A WG48 Japanese members.
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  • Satoshi Hirayama, Kento Kiuchi, Takayasu Fujino, Motoo Ishikawa, Tadas ...
    2013 Volume 133 Issue 11 Pages 843-850
    Published: November 01, 2013
    Released: November 01, 2013
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    Effects of an externally applied magnetic field on CO2 and SF6 arc plasmas are examined by three-dimensional time-dependent magnetohydrodynamic numerical analysis. The present numerical analysis is carried out for a cylindrical-shaped simple chamber filled with CO2 or SF6 under the condition of direct electric current and uniform magnetic field. The dependence of thermodynamic and transport properties, and emission coefficients of each gas on temperature and pressure is taken into account in the numerical analysis. Numerical results show that thermal constriction of arc column by applying a magnetic field is more clearly apparent in the case of CO2. The heat transfer from arc plasma to surrounding gas for CO2 is more intense than that for SF6. This is because the rotational speed of arc plasma for CO2 is about two times faster than that for SF6, and also the thermal conductivity of CO2 at the edge of arc column is higher than SF6. In the case of CO2, both of arc voltage and pressure are more greatly increased by applying the magnetic field compared with the case of SF6.
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  • Yoshimasa Watanabe, Hiroshi Nishizawa, Hajime Nakajima, Masahiro Shika ...
    2013 Volume 133 Issue 11 Pages 851-857
    Published: November 01, 2013
    Released: November 01, 2013
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    This study focused on the development of a DC earth leakage current sensor comprising a flux-gate. Although a flux-gate leakage current sensor has conventionally used, the fluctuation of sensitivity due to the variation of temperature occurs up to approximately ±15%. The compensation method of the temperature characteristic by taking advantage of the detected voltage of first harmonic at R. T. (298K) under the leakage current of 0mA enabled us to reduce the fluctuation under ±10%.
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  • Yasunobu Yokomizu, Yasuhiro Hayashi, Toshiro Matsumura, Amane Majima, ...
    2013 Volume 133 Issue 11 Pages 858-866
    Published: November 01, 2013
    Released: November 01, 2013
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    The arc extinguishing limitation, (dE / dt)lim, in a thermal re-ignition region was evaluated for CO2 and its mixtures with N2 and O2 at a concentration of 0.2 to study variation in (dE / dt)lim due to N2 and O2 additions. A progress effect on (dE / dt)lim did not necessarily emerge in any arc state but arose only in a specific arc state. Further consideration led to the essential facts that the emergence condition of the progress effect depended on the arc-core temperature at the instant of an interrupting current zero. In other words, admixing N2 with CO2 proved to produce an increasing effect on (dE / dt)lim, if the temperature composition in an arc-core cross-section at the current zero showed an axial temperature in a range from about 9 to 14kK. In contrast, mixture of O2 with CO2 was found to contribute to a distinct rise in (dE / dt)lim, if the arc temperature composition at the current zero revealed the axial temperatures below 10kK. This rise in (dE / dt)lim arose more pronouncedly with a lower axial temperature. The above-mentioned facts were explained, in terms of a temperature reduction factor showing a decay rate of an arc temperature with time.
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  • Yasunobu Yokomizu, Yasuhiro Hayashi, Toshiro Matsumura, Amane Majima, ...
    2013 Volume 133 Issue 11 Pages 867-874
    Published: November 01, 2013
    Released: November 01, 2013
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    Concerning CO2 and its mixture with N2 at a concentration of 0.2, an enthalpy h, a specific heat CP, an electrical conductivity σ and a thermal conductivity κ at temperatures of 300-20,000K were obtained to find out effect of N2 addition on these high-temperature properties. For comparison, similar determination was also performed for CO2-O2 mixture. Admixing N2 and O2 with CO2 proved to result in significant variation in CP and κ in a temperature range from 5,000 to 10,000K. The temperature reduction factor was furthermore derived to find out the property as the arc-quenching gas. This evaluation led to the suggestion that adding N2 to CO2 achieves rapid decay in an interrupting arc temperature in a range from 7,000 to 11,000K, while admixing O2 with CO2 produces rapid diminishing effect on the interrupting arc temperature in a range from 5,000 to 9,000K. An attribution analysis successfully gave the fact that these effects on rapid decay in the temperature arise from variation in CP due to N2 and O2 additions, furthermore from the reactions 2N⇔N2 and C+O⇔ CO.
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  • Haruhiko Kohyama, Tomohito Mori, Aya Yamamoto, Kenji Kamei, Hiroki Ito ...
    2013 Volume 133 Issue 11 Pages 875-881
    Published: November 01, 2013
    Released: November 01, 2013
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    The practical prediction method was studied and evaluated for transmission line voltage after circuit breaker open, where d.c. voltage remains. In case of reactor compensated lines, oscillating voltage appears with a frequency determined by line to earth capacitance and reactor at the end of line. As the line side voltage wave also includes subsidiary oscillation by phase to phase capacitance and dumps by charge leakage along supporting insulators, high-speed processor is required to predict the voltage wave by fitting or pattern recognition methods. Limited parameters such as line voltage frequency and its phase angle make very fast wave analysis feasible within 0.1 seconds using general purpose processors. Controlled reclosing of transmission line utilizing the prediction method is evaluated by numerical analysis to reduce switching overvoltage satisfactory.
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  • Yuta Ono, Mahmudul Kabir, Masafumi Suzuki, Noboru Yoshimura
    2013 Volume 133 Issue 11 Pages 882-887
    Published: November 01, 2013
    Released: November 01, 2013
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    Recently, the need of using of direct molded (DM) air bushing in cable end terminals and transformers are increasing due to its merits of lighter weight and simpler structure comparing to the porcelain bushing. It uses epoxy resin as the main insulation material around the main conductor. Despite several merits of using epoxy resin, the field concentration around the shield fittings occurs which may cause electricity failure and insulation degradation. For the field controlling, an approach has started to use the Zinc Oxide (ZnO) microvaristors in epoxy resin. However, the measurement of electrical properties of epoxy resin filled with ZnO microvaristors exposed in high voltage (HV) is not easy. So, we have approached with circuit simulation method to understand the electrical properties of ZnO particles while injected in epoxy sheet by LTspice circuit simulator. Epoxy sheets with different volume fraction of ZnO particles were proposed and their equivalent circuits were prepared. The simulation results showed the relationship between their electrical properties with the amount and distribution of ZnO particles in epoxy sheet under HV application.
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  • Tsukasa Miyagi, Shin-ichi Tanaka, Mikimasa Iwata, Tadashi Amakawa
    2013 Volume 133 Issue 11 Pages 888-894
    Published: November 01, 2013
    Released: November 01, 2013
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    This paper describes experimental and analytic studies on pressure rise and propagation phenomena due to high current arcs in a container with opened pipes. The shape of experimental container is decided taking into account of underground common ducts. First, the arcs were ignited in the container with varying diameter D and length L of the opened pipes under the condition of arc current of 4 to 12.5kA and the arc duration of 0.1s. Based on measured waveforms, the maximum value of pressure rise Pmax and the pressure oscillation frequency Posc were obtained. As the result, it emerged that there is a tendency that Pmax becomes high with lessened D and elongated L. Moreover, D has a much greater impact on Pmax. And it emerged that the tendency of Posc with changing D and L can be explained by Helmholtz resonance approximately. Secondly, CFD model for the container with opened pipe was developed based on the experimental results, and simulations were carried out. Consequently, simulation results were found to correspond to the experimental pressure rise.
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  • Yasunori Tanaka, Xiaoli Song, Yoshihiko Uesugi, Shuhei Kaneko, Shigemi ...
    2013 Volume 133 Issue 11 Pages 895-902
    Published: November 01, 2013
    Released: November 01, 2013
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    This paper describes the influences of different nozzle shapes on the thermal interruption capability of a CO2 model circuit breaker with H2 inclusion using an fluid dynamic simulation under the assumption of a local thermodynamic equilibrium condition. Six nozzle shape spaces were studied in order to find the effects respectively from differences in the nozzle convergence angle and nozzle throat length. It is proved that the temperature and gas flow velocity around the nozzle inlet position are crucial for the thermal interruption of CO2 arc with H2 gas. Power balance in the whole arc plasma region was also studied to know the dominant power loss during the thermal interruption processes. As a result, convection loss may determine the thermal interruption capability of CO2+H2 arcs, which is also related with a local maximum gas flow velocity on the center axis in the nozzle throat around current zero.
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Paper
  • Takayoshi Hayashi, Takahiro Shimoo, Shinji Wakao
    2013 Volume 133 Issue 11 Pages 903-909
    Published: November 01, 2013
    Released: November 01, 2013
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    In the past, we have proposed some battery operations in a photovoltaic (PV) system using the PV output and load power forecasts. In the proposed method, we utilized multi-objective optimization for a residential area model that includes a large number of PV systems with storage batteries. To practically demonstrate that the proposed operation effectively improves the economic and environmental efficiencies, it is indispensable to evaluate the forecast error effects on operation design of PV system with storage battery. In this paper, we propose a method for evaluating the robustness of battery operation taking account of the statistical characteristics of forecast errors. Some numerical examples, which show the validity of the proposed method, are also presented.
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  • Junji Kondoh
    2013 Volume 133 Issue 11 Pages 910-917
    Published: November 01, 2013
    Released: November 01, 2013
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    Installation of wind power into power systems has been limited due to the problem of frequency regulation during light-load periods at night. As a solution, frequency regulation by heat pump water heaters had been proposed and tested. In this paper, the demonstration test with three heat pump water heaters used in practical houses is described. The result shows that total power consumption had droop characteristic against frequency deviation, which means that the heat pump water heaters contribute to power system frequency regulation.
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  • Koji Michishita, Hiroaki Sato, Shigeru Yokoyama, Seiji Furukawa
    2013 Volume 133 Issue 11 Pages 918-923
    Published: November 01, 2013
    Released: November 01, 2013
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    For the effective and efficient insulation design of a power line, the return-stroke current waveform parameters are indispensable. A charge transfer is one of the important parameters when the damage to the equipments on a power line due to the energy of the lightning is discussed. The amount of a charge transfer associated with a lightning flash or individual strokes can be estimated by using the electric field change obtained with a slow antenna. The authors observe the electric field waveforms in south Kyushu for the purpose of efficient acquisition of return-stroke current parameters. In this paper, the authors discuss the relation between the negative first return-stroke current peaks and the impulse charge transfer based on the observed electric field waveforms.
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