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Ishigaki Y.,Japan AE Power Systems Corporation | Kasama T.,Iwate University | Takaki K.,Iwate University | Fujiwara T.,Iwate University
IEEE Transactions on Plasma Science

Effects of the radius of a coaxial pulse corona reactor and the polarity of an applied voltage on NO x (nitrogen oxide) removal are investigated for industrial applications of the NO x removal technology. Three radii of the pulse corona reactors (10, 30, and 50 mm) were chosen in the experiments of ozone generation and NO x removal, and their energy efficiencies were measured. The 50-mm-radius reactor with the positive pulsed voltage was found to be suitable for the removal of large amount of NO x and ozone generation. On the other hand, it was clarified that the 10-mm-radius reactor with the negative pulsed voltage is effective for the removal of small amount of NO x and ozone generation. In the case of the 30-mm-radius reactor, energy efficiencies versus ozone concentration characteristics became a single curve at both the positive and negative polarities. For the purpose of the industrial application, a parallel reactor system and a reactor having a dielectric barrier were also tested experimentally. Through these experiments, the value of the energy efficiency of the parallel reactor system was confirmed to keep almost the same value as that of the single-reactor system. The reactor with the dielectric barrier on the outer electrode had higher energy efficiency than that without one. © 2011 IEEE. Source

Hikosaka T.,Japan AE Power Systems Corporation
Proceedings of the International Symposium on Electrical Insulating Materials

Japan AE Power Systems which is a joint venture in the field of transmittion and distribution equipment of Hitach, Fuji Electric and Meidensha Corporation is implementing environmental protection activities towards realizing a sustainable society. This paper describes epoxy cast resin transformer of nacelle installation type for wind turbine, and Palm Fatty Acid Ester oil immersed transformer. © 2011 The Institute of Electrical Engineers, Japan. Source

Sugimoto T.,Yamagata University | Ishii H.,Japan AE Power Systems Corporation | Higashiyama Y.,Yamagata University
IEEE Transactions on Industry Applications

In order to develop a noncontact surface resistivity measurement technique, the corona charging of a test material with simultaneous measurement of an induction current caused by a traveling surface charge was investigated using phi-type electrodes. The phi-type electrode consists of a high-voltage needle electrode that penetrates a circular hole of a grounded planar electrode. The phi-type electrode is positioned above an electrically isolated test material. The purpose of the electrode design is to supply static charge to the test surface, to produce a ground potential close to the charged test material, and then to measure the induction current or the surface potential caused by the propagated surface charge. Test materials with surface resistivities from 106 to 1012Ω/□ were prepared by coating conductive polymer layers onto polyvinyl chloride disks. Two setups were prepared for higher surface resistivity (Model H) and lower surface resistivity (Model L). For Model H, a surface voltmeter was used to measure the slow propagation of surface charge. The rise time of the surface potential increased linearly with the surface resistivity from 3 × 109 to 10 12Ω/□. The Model L had two induction probes to measure the fast propagation of surface charge. The rate of the total induction charges was a function of the surface resistivity from 3 × 106 to 3 × 109Ω□. Experimental results obtained from both the H and L models agreed with the predicted results. The phi-type electrode was verified as effective for noncontact surface charge measurements. © 2006 IEEE. Source

Yamagata Y.,Tokyo Electric Power Company | Ono M.,Japan AE Power Systems Corporation | Sasamori K.,MItsubishi Electric | Uehara K.,Toshiba Corporation
European Transactions on Electrical Power

SUMMARY The Tokyo Electric Power Company, Inc (TEPCO) plans 1100-kV power network system in Japan in order to meet the steady increasing demand for electricity. Four-hundred kilometer 1100-kV-designed double-circuit transmission lines have already been constructed and are now operated at 550-kV. 1100-kV substation equipment has also been developed. To realize the best design technically and economically throughout the transmission line and the substation, important technical solutions for network problems peculiar to the ultra high voltage (UHV) system have been introduced. They include insulation coordination, overvoltage countermeasures, and fast multi-phase reclosing systems with high speed earthing switches (HSESs). The overvoltage countermeasures are realized by high performance metal oxide surge arresters (MOSAs), gas circuit breakers (GCBs) with closing/opening resistor, and disconnectors (DSs) with resistor. These sophisticated technologies realize highly reliable and economical UHV substations and transmission lines. This paper describes important, fundamental, and specific requirements for UHV substations such as their compactness, economical view, and environmental harmony. There are many technical/economical aspects to be considered on UHV substation and based on those considerations: (a) compactness, (b) less impacts to the environment, (c) optimizing cost, could be fulfilled. This paper also describes the technologies addressed to UHV class components such as the introduction of new concept "on-site assembly transformer," VFTO reduction countermeasure and the necessity of full-scale seismic qualification test. Copyright © 2011 John Wiley & Sons, Ltd. Source

Japan Ae Power Systems Corporation | Date: 2011-07-13

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