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68 Abstracts (Fuji Electric Journal) Ground Systems for Electric Railways Shigeo Tanaka Fuji Electric Journal Vol.72 No.2 p (1999) There have been various technical innovations based on power electronics and microelectronics technique in electric railways. In the power supply system, problems caused by the special characteristics of railway loads (regeneration, harmonics, voltage fluctuation, phase reversal, etc.) have been solved mainly by power electronics technique. In the computer control system, distributed systems using an optical LAN (local area network) will come into wide use with the downsizing of computers and improvements in communications. Keywords in the stations will be less energy, less labor, and more conveniences. Present Status and Outlook Toward the 21st Century for Electric Railway Technologies Fukuo Etoh Fuji Electric Journal Vol.72 No.2 p.9799 (1999) In addition to safety, high speed and amenity, modern railway systems are expected to be more economical, consume less energy, need less maintenance, and be environment-friendly. Recent remarkable advances in power electronics, microelectronics, and information processing and control technologies have made a large contribution to the attainment of these expectations. Fuji Electric has supplied most advanced systems and facilities to the railway industry centering on electric power supply and electric propulsion. This paper describes the present status and outlook toward the 21st century of Fuji Electric on electric railway technologies. New DC High-Speed Circuit Breakers for Traction Substations Kazuo Aibara Nobuo Suzuki Masanori Kikuchi Fuji Electric Journal Vol.72 No.2 p (1999) In traction substations, DC high-speed air circuit breakers have been used. They generate an explosive arc at the time of interruption and so require frequent inspection and maintenance. Fuji Electric has newly developed an arcless circuit breaker based on the vacuum breaker and has solved those problems. Its principle of operation is to interrupt at the point of zero current produced by superposing oscillating current on the DC current. Its little mechanical wear reduces maintenance and running cost. It is high value-added equipment that can realize low life cycle cost, small size, and higher safety. Power Electronics Application to Railway Ground Systems Yoshiro Makino Hideaki Odaka Mitsutoshi Yamamoto Fuji Electric Journal Vol.72 No.2 p (1999) Many application systems of power electronics are used in railway ground systems. Taking up 12-pulse rectifiers for harmonics suppression, power regeneration inverters and regenerated-power absorbers for power regeneration, and single-phase SVCs (static var compensators) and threephase self-commutated SVC against voltage fluctuation and unbalanced three phases, this paper describes an outline of these systems and their effectiveness using data on site. Future large capacity power converters will still more reduce in size, improve in efficiency, and advance in functions by flat IGBT (insulated-gate bipolar transistor) application. Electrical Equipment for Rolling Stock Kazunori Hirotsu Satoru Ozaki Eio Hoshino Fuji Electric Journal Vol.72 No.2 p (1999) This paper outlines our course of technical development of electrical equipment for rolling stock toward the 21st century. IGBTs will be the mainstream of power devices. Voltage and performance of device will be raised. In the main circuit system, 3-level and 2-level systems are used, but 2-level systems will increase as the device voltage and performance become higher. The cooling of large capacity devices will be performed with ice-free coolant to meet the protection of global environment. The performance and functions of control equipment will advance linking up with the devices, and simulation will be utilized for more efficient commercialization. Performance Verification of the New DC High-Speed Circuit Breaker for Traction Substation Kouji Konno Naoki Shimizu Tomohito Kanno Fuji Electric Journal Vol.72 No.2 p (1999) Fuji Electric has developed a new DC high-speed circuit breaker for electric railway substations based on the vacuum circuit breaker. This equipment consists of a vacuum circuit breaker with an electromagnetic repulsion mechanism, a main oscillation circuit, a sub-oscillation circuit, a nonlinear resistor, and a detector and control unit. It is a combination of a mechanical switchgear and an electronic circuit and requires the verification of electrical, mechanical, and combination performance. This paper outlines the performance tests and their results. VVVF Inverter Systems and Auxiliary Power Supply Systems for the Existing Lines Koji Iwamura Michio Iwahori Masaaki Nonaka Fuji Electric Journal Vol.72 No.2 p (1999) From among Fuji Electric s VVVF inverter systems, this paper gives an example of the 3-level inverter with high-voltage IGBTs, and also outlines the high-cost-performance 2-level inverter newly developed according to the technical trend. The DDM system that attracts attention as a major application in the future is under development, the status of which is outlined. The auxiliary power supply systems have met the needs of various rail cars. Recent applications for electric and diesel cars are described. Propulsion Systems for the Shinkansen Ryoji Inoue Hidenobu Tsuchihashi Chiharu Oosawa Fuji Electric Journal Vol.72 No.2 p (1999) Since the Tokaido Shinkansen started operation, the propulsion system for the Shinkansen has met the needs of the times such as safety, reliability and economy, followed by increase in speed, energy saving and environmental preservation through technical innovations. The technical progress is mostly due to the rapid progress in power electronics including high-voltage, high capacity power devices for the main circuits of traction motor control inverters and high performance, high-speed microprocessors. This paper describes the present status of propulsion systems for the Shinkansen in technical transition and the future technical trend of propulsion system apparatus.

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70 Shaft Voltage of PWM Inverter-Driven Induction Motors Yoshihiko Okuyama Hideki Fujii Fuji Electric Journal Vol.72 No.2 p (1999) Because of the technical progress of PWM inverters, induction motors driven at variable speed are more and more increasing. However, inverter-driven motors bear more burden to various aspects of performance than when driven by commercial power. A typical example is a burden to insulation caused by inverter surge. With regard to the shaft voltage of PWM inverter-driven induction motors which has not yet clearly analyzed, this paper explains the mechanism of its generation and proposes an equivalent circuit for analysis. The adequacy was verified by the test results with an actual machine. Series Voltage-Compensated AC Power-Saver Yoshihiro Ishikawa Hiroshi Yamamoto Yasuhiro Okuma Fuji Electric Journal Vol.72 No.2 p (1999) Fuji Electric started marketing the multi-function power system MPS using AC chopper and high-frequency switching technologies and the series voltage-compensated AC power-saver using series voltage compensation technology. The AC power-saver controls the load voltage constantly at a proper voltage through a power current transformer by 16 khz high-frequency PWM control with IGBTs, giving a high power-saving effect. Also it is maintenance free because the main circuit includes no short-life components such as an electrolytic capacitor and a cooling fan. This paper describes the features, specifications and lineup, circuitry configuration and operation, and test results of the power-saver. Designing Methodology for Low-Cost, High-Efficiency Permanent Magnet Synchronous Machines Yoshihiko Okuyama Fuji Electric Journal Vol.72 No.2 p (1999) Since the appearance of rare-earth permanent magnets with very good characteristics happened together with the energy-saving tend-ency of the times, permanent magnet synchronous machines have been in the spotlight. This paper describes a basic design method for permanent magnet synchronous machines in which the condition of constant field magnetomotive force is introduced into the design method for conventional synchronous machines. Then to attain high efficiency and low cost, the paper concretely and theoretically describes design considerations to minimize the amount of costly rare-earth magnets and yet satisfy the functions and performance.

LH_Series_Rev2014.pdf

LH_Series_Rev2014.pdf REMINDERS Product information in this catalog is as of October 2013. All of the contents specified herein are subject to change without notice due to technical improvements, etc. Therefore, please check