In AC/DC converter transformers under DC application, the electric field distributions are distorted due to the deposited charge on pressboard. However, the time dependent characteristics of DC electric field stress in o ... more
We develop a micro-gap electrode device on quartz substrate to investigate the dielectric breakdown resistance on constrained layer of silica/epoxy interface. After application of stress, the device is cut at the middle ... more
The stator coil end of a rotating machine has the structure of electric field grading system (SG system) for the purpose of preventing partial discharge. Light emission of partial discharge at such SG on a model bar syst ... more
With the proliferation of wearable terminals and internet of things (IoT) equipment, electrostatic discharges (ESDs) due to electrification of humans and objects can cause electromagnetic malfunction to these devices, wh ... more
Measurement of Transient Magnetic Field caused by ESD between Spherical Electrodes using a Shielded Loop Probe and Current Estimation of EM Radiation Model
Transient magnetic field caused by micro-gap ESD was measured to examine the discharge current of a dipole radiation model. The magnetic field measured by a shielded loop probe, a conversion factor from an output voltage ... more
Immunity testing of electronic equipment for electrostatic discharge (ESD) is prescribed as IEC 61000-4-2 by the International Electrotechnical Committee (IEC), in which contact discharge current testing from an ESD gene ... more
At joint and terminal sections of electric power cables, there is possibility to occur partial discharges (PDs) in defects of insulating materials. Therefore, PD measurement is useful from a viewpoint of assessing insula ... more
Influence of Absolute Humidity and Saturation Deficit on Air Discharge Currents from Electrostatic Discharge Generator with Three Different Approach Speeds
論文No: ページ数: 5 日付: 2020/02/01
著者: Takeshi Ishida (Noise Laboratory Co., LTD), Osamu Fujiwara (Noise Laboratory Co., LTD/The University of Electro-Communications)
キーワード : air discharge，absolute humidity，saturation deficit，IEC specified and non-specified climatic range，discharge current，measurement
The International Electro-technical Commission (IEC) specifies air discharge immunity testing for electronic equipment in the standard 61000-4-2 under the climatic conditions of relative humidity from 30 to 60% and ambie ... more
This paper presents an effect of transient-electromagnetic fields (or pulsed electromagnetic fields) on the hatching of silkworm eggs. In our experiment, transient-electromagnetic fields by spark discharges were applied ... more
IEEJ Transactions on Fundamentals and Materials Vol.140 No.2 (2020) Special Issue on Recent Developments in Basic and Applied Researches on Electrical Discharge
論文No: ページ数: 52 日付: 2020/02/01
著者:
キーワード :
・絶縁油-プレスボード複合絶縁構成における直流電界ストレスの時間・空間推移特性：中根 龍一，加藤 克巳，早川 直樹，大久保 仁・マイクロギャップ電極デバイスを用いたシリカ/エポキシ界面の破壊経路の直接観察：三川 莉奈， ... more
When a transformer of a customer is energized in a distribution system, inrush currents whose magnitudes reach tens of rated currents may occur. The inrush currents may lead to an instantaneous voltage drop and/or an unn ... more
In recent years, there have been growing needs for accurate estimation of photovoltaic (PV) power due to the widespread use of PV power generation. PV power is usually estimated based on the amount of solar radiation, ai ... more
The IEC 61850 based process bus system on a substation automation system is currently being verified in the world. Some typical IEC 61850 based process bus system contains “Sampled value” communication function and it re ... more
In order to realize more efficient procurement and activation of control reserves, the balancing market is going to be established in 2021 in Japan. As for Synchronized Frequency Restoration Reserve (S-FRR) that is calle ... more
Dependable Parallel Multi-population Modified Brain Storm Optimization for Distribution State Estimation considering Outliers using Just-In-Time Modeling and Correntropy
論文No: ページ数: 10 日付: 2020/02/01
著者: 東 大智（明治大学大学院 先端数理研究科 ネットワークデザイン専攻），福山 良和（明治大学大学院 先端数理研究科 ネットワークデザイン専攻），大井 章弘（富士電機（株）技術開発本部），神通川 亨（富士電機（株）技術開発本部），藤本 久（富士電機（株）技術開発本部）
キーワード : 配電系統，負荷推定型状態推定，ジャストインタイムモデリング，コレントロピー，ディペンダビリティ，並列複数集団型モディファイドブレインストームオプティミゼイション distribution system，load adjustment distribution state estimation，just in time modeling，correntropy，dependability，parallel multi-population modified brain storm optimization
This paper proposes dependable parallel multi-population modified brain storm optimization for load adjustment distribution state estimation (DSE) considering outliers using just in time (JIT) modeling and correntropy. I ... more
Energy data analytics and behavioral science knowledge are expected to improve the quality of information to promote energy efficiency behavior. Although there have been many studies on Home Energy Management System usin ... more
This paper proposes an efficient method for photovoltaic (PV) system output forecasting by Deep Boltzmann Machines (DBM) with Scatter Search-Predator-Prey Brain Storm Optimization (SS-PPBSO). DBM plays a key role to extr ... more
Partitioning Method for the Large-scale Operation Planning Problem of a District Heating and Cooling System for Electricity Adjustment
論文No: ページ数: 10 日付: 2020/02/01
著者: 冨田 康平（早稲田大学），飯野 穣（早稲田大学），林 泰弘（早稲田大学），山本 有途（東京ガス（株）），小林 広介（東京ガス（株）），速川 敦彦（東京ガス（株））
キーワード : 地域冷暖房システム，コージェネレーションシステム，調整力，混合整数非線形計画法，運転連続性，部分最適化問題 district heating and cooling system，combined heat and power，spinning reserve，mixed integer nonlinear programming method，operation continuity，partial optimization problem
Introduction of variable renewable energies (VREs) is proceeding all over the world. However, output fluctuation due to inherent intermittency reduce stability of the power system. Therefore, more spinning reserve is nee ... more
Penetration level of large-scale wind power into the existing grid has been increasing significantly which impacts on the frequency stability during transient condition. This paper proposes a novel virtual synchronous ge ... more
A Study on Recovery Voltage during Capacitive Current Interruption on High Resistance Earthed Neutral Systems (3)
論文No: ページ数: 6 日付: 2020/02/01
著者: 柳 康介（東芝エネルギーシステムズ（株）浜川崎工場），豊田 充（東芝エネルギーシステムズ（株）浜川崎工場），中小路 元（東京電力パワーグリッド（株）工務部送変電建設センター変電グループ），伊藤 保則（中部電力（株）電力ネットワークカンパニー 送変電技術センター技術グループ），古賀 雄貴（関西電力（株）送配電カンパニー電力システム技術センター 変電グループ）
キーワード : 高抵抗接地系，遮断器，進み電流遮断，JEC規格，IEC規格，架空送電線 high resistance neutral systems，circuit breaker，capacitive current switching，JEC Standard，IEC Standard，overhead transmission line
The recovery voltages between contacts of circuit-breaker during capacitive current interruption on transmission lines with high resistance earthed neutral system were investigated. Actually operating transmission line s ... more
The electrolysis current control methods for HTES (High Temperature Electrolysis of Steam) hydrogen production plants are proposed. The methods enable the plants to produce Hydrogen in various production rates that is ne ... more
This paper describes a method for estimating lightning fault rates of transmissions line by statistical calculation using XTAP. Lightning current waveforms have been observed in Hokuriku area along the coast of the Japan ... more
Synthesis of Equivalent Circuit from Homogenized FE Equation using Model Order Reduction
論文No: ページ数: 6 日付: 2020/02/01
著者: Shingo Hiruma (Graduate School of Information Science and Technology, Hokkaido University), Hajime Igarashi (Graduate School of Information Science and Technology, Hokkaido University)
キーワード : complex permeability，equivalent circuit，model order reduction，multi-scale problem
This paper introduces a novel method for synthesis of the equivalent circuit of an electromagnetic system described by a homogenized FE equation via model order reduction. The homogenization method replaces fine-structur ... more
Potential and Challenges of using AI in the Energy Field
論文No: ページ数: 4 日付: 2020/02/01
著者: 堤 富士雄（電力中央研究所）
キーワード : AI，機械学習，E2E，教師付きデータ，帰納推論，演繹推論 Artificial Intelligence，machine learning，End to End learning，supervised data，inductive reasoning，deductive reasoning
This paper describes the latest trends in AI research and the challenges and possibilities for applications in the energy field. As for AI research trends, the latest technological trends such as E2E learning and the fus ... more
There is a growing need to use photovoltaic (PV) technology to mitigate global warming and the depletion of fossil fuels. However, the high network penetration of PVs potentially lessen the stability and the reliability ... more
This paper proposes an energy disaggregation method for the total energy consumption of a commercial building which only has a limited number of facility status monitor points. The method can estimate and identify the en ... more
In order to operate heat source systems effectively, it is necessary to make clear their optimum operations which based on the actual performances of the equipment. In past study, the target is limited to a part of the s ... more
