Electrical Engineering in Japan最新文献_第4页

Measurements of electrical resistances and investigations of factors affecting corrosion and breakages of shielding layers in extruded three-layer 6.6 kV XLPE cables 挤压三层6.6 kV交联聚乙烯电缆电阻测量及屏蔽层腐蚀破损影响因素研究

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2023-09-03 DOI: 10.1002/eej.23447

Takashi Kurihara, Kenichi Kimura, Takuya Watanabe, Tomoyuki Sato

{"title":"Measurements of electrical resistances and investigations of factors affecting corrosion and breakages of shielding layers in extruded three-layer 6.6 kV XLPE cables","authors":"Takashi Kurihara, Kenichi Kimura, Takuya Watanabe, Tomoyuki Sato","doi":"10.1002/eej.23447","DOIUrl":"10.1002/eej.23447","url":null,"abstract":"Corrosion and breakages of shielding layers are one of the factors for degradation of extruded three-layer (E-E type) 6.6 kV cross-linked polyethylene (XLPE) cables. Tohoku Electric Power Network has been measuring electrical resistances of shielding layers in E-E type 6.6 kV XLPE cables, and recently has found breakages of shielding layers. The authors performed an accelerated degradation test for shielding layers of E-E type 6.6 kV XLPE cables by taking account of aqueous solution, temperature, heat cycles, bending stress, frequency of an applied voltage, and water-proof layer in the test conditions, and investigated factors affecting corrosion and breakages of shielding layers. Corrosion, cracks, and breakages were found on shielding layers in the cables without water-proof layer, but no crack was found in the cables with water-proof layer, when heat cycles were applied to the cables, and shielding layers were supplied with artificial sea water. We investigated the suppressive effect of the cables with water-proof layer on cracks and breakages of shielding layers by measuring tensile strengths of copper tapes obtained from the shielding layers of the cables with and without water-proof layers.","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 4","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135498881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimizing service restoration in distribution systems based on scheduling of crews considering priorities of loads 基于考虑负荷优先级的机组调度优化配电系统服务恢复

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2023-08-25 DOI: 10.1002/eej.23442

Shinya Sekizaki, Teruyuki Kato, Ichiro Nishizaki, Tomohiro Hayashida, Kazuhisa Hikoyama, Tomoaki Nonoyama

{"title":"Optimizing service restoration in distribution systems based on scheduling of crews considering priorities of loads","authors":"Shinya Sekizaki, Teruyuki Kato, Ichiro Nishizaki, Tomohiro Hayashida, Kazuhisa Hikoyama, Tomoaki Nonoyama","doi":"10.1002/eej.23442","DOIUrl":"https://doi.org/10.1002/eej.23442","url":null,"abstract":"The service restoration to sound sections within a short period as much as possible, performed after the permanent fault occurs in a distribution system, is significant for maintaining power supply reliability. This paper proposes an efficient method to find service restoration procedures based on fault searching and the optimal work scheduling of crews, considering the power supply priorities of loads and the probability of occurrence of faults. The proposed method is composed of two-stage problems to reduce the outage sections efficiently: (i) the problem to find a series of searching procedures for unknown fault locations in the first stage and (ii) the optimization problem of work schedules of crews in the second stage. In the first stage, the order of operation of switches opened for searching for the fault direction is determined, constituting the searching tree. After that, the proposed optimization method can efficiently solve the work scheduling problem by formulating it as a mixed-integer linear programming problem in the second stage. The computational experiments using a large-scale distribution system model with many remote and manual switches show that the proposed method can provide efficient service restoration procedures within a reasonable computational time.","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50119687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Semiconductor piezoresistance prediction model for mechanical sensor design 用于机械传感器设计的半导体压阻预测模型

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2023-08-19 DOI: 10.1002/eej.23443

Ryo Nakanishi, Ryo Morikawa, Masashi Kawai, Takumi Nakahara, Toshiyuki Toriyama

引用次数: 0

Fundamental evaluation of direct-cooling technology for in-wheel drive system 轮毂驱动系统直接冷却技术的基本评价

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2023-08-18 DOI: 10.1002/eej.23444

Tetsuya Suto, Makoto Ito, Akeshi Takahashi, Ryuichiro Iwano, Takafumi Hara

引用次数: 0

Experimental and theoretical analyses on power generation characteristics of co-axial MHD energy conversion device 同轴MHD能量转换装置发电特性的实验与理论分析

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2023-08-16 DOI: 10.1002/eej.23446

Takahiro Hasebe, Ryo Sasaki, Takayasu Fujino, Hidemasa Takana, Hiromichi Kobayashi

引用次数: 0

Electrical treeing phenomena in two-layer silicone gel with different crosslinking degrees and its dielectric strength 不同交联度双层硅胶的电树枝现象及其介电强度

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2023-07-08 DOI: 10.1002/eej.23437

Risa Kuroda, Hyeon-Gu Jeon, Haruo Ihori

引用次数: 0

Formulation and mixing conditions of magnetic composite materials used for magnetic wedges in an interior permanent magnet synchronous motor 内装永磁同步电机磁楔用磁性复合材料的配方和混合条件

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2023-06-30 DOI: 10.1002/eej.23430

Manabu Horiuchi, Ryo Yoshida, Masami Nirei, Mitsuhide Sato, Tsutomu Mizuno

{"title":"Formulation and mixing conditions of magnetic composite materials used for magnetic wedges in an interior permanent magnet synchronous motor","authors":"Manabu Horiuchi, Ryo Yoshida, Masami Nirei, Mitsuhide Sato, Tsutomu Mizuno","doi":"10.1002/eej.23430","DOIUrl":"https://doi.org/10.1002/eej.23430","url":null,"abstract":"An interior permanent magnet synchronous motor (IPMSM) is characterized by its high efficiency. However, torque ripple and loss occur because of the spatial harmonics generated by air-gap permeance fluctuations. This study clarified that slot harmonic components can be suppressed by inserting magnetic wedges made of magnetic composite material in the slot opening of an IPMSM. First, the authors examined the torque and loss characteristics by varying relative permeability and saturation magnetic flux density of magnetic wedges using finite element analysis (FEA). Results indicated that the torque ripple and loss could be suppressed when the relative permeability of the magnetic wedge was μr = 10 to 22 and the saturation magnetic flux density was Bs = 0.5 to 0.75 T. Furthermore, the authors produced magnetic composite materials made of various soft magnetic material powders and examined their magnetic properties and viscosities. Results showed that a magnetic composite material with optimal magnetic properties and injectable viscosity could be manufactured using Fe-Si-Al with a low volume fraction.","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50155826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The high-frequency phenomenon of copper clad aluminum wires which are lower the alternating current resistance than copper solid wires, and the application of copper clad aluminum wires to the electrical equipment 交流电阻比铜实心线低的铜包铝线的高频现象，以及铜包铝丝在电气设备中的应用

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2023-06-22 DOI: 10.1002/eej.23435

Katsuhiko Ueda, Chefen Hung

引用次数: 0

Area day-ahead photovoltaic power prediction by just-in-time modeling with meso-scale ensemble prediction system 基于中尺度集成预测系统的实时建模区域日前光伏发电量预测

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2023-06-13 DOI: 10.1002/eej.23426

Yusuke Mori, Shinji Wakao, Hideaki Ohtake, Takahiro Takamatsu, Takashi Oozeki

{"title":"Area day-ahead photovoltaic power prediction by just-in-time modeling with meso-scale ensemble prediction system","authors":"Yusuke Mori, Shinji Wakao, Hideaki Ohtake, Takahiro Takamatsu, Takashi Oozeki","doi":"10.1002/eej.23426","DOIUrl":"https://doi.org/10.1002/eej.23426","url":null,"abstract":"Photovoltaics (PV) output prediction, which is indispensable for power system operation, can affects demand and supply adjustment adversely when large prediction error occurs. Thus, the reduction of large error as well as average error is required in PV power prediction. In 2019, the operation of the Meso-scale Ensemble Prediction System (MEPS) of numerical weather prediction started from the JapanMeteorological Agency, and the amount of forecasting information would be potentially useful for the improvement of PV power prediction. However, very few studies on inputting multiple meteorological elements of the MEPS have been reported. In this paper, we newly develop the prediction model for an area day-ahead PV power output composed of Just-In-Time Modeling (JIT Modeling) with multiple elements of theMEPS. The developed method achieves precise forecasts with low computational load by both selecting meteorological elements valid for improving prediction accuracy and adequately devising the structure of JIT Modeling. Some numerical examples demonstrating the effectiveness of the developed method are also presented. In particular, the proposed method reduces large error significantly.","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50131402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Development of a short-term solar irradiance forecasting using satellite image in combination with numerical weather prediction model 利用卫星图像和数值天气预报模型开发短期太阳辐照度预报

IF 0.4 4区工程技术

Electrical Engineering in Japan Pub Date : 2023-06-12 DOI: 10.1002/eej.23432

Atsushi Hashimoto, Katsuhisa Yoshimoto

引用次数: 0