Hitachi, Ltd.

Nec Corporation

Ihi Corporation

Hideki Ogata

Masato Suzuki

Hiroshi Morita

Hiroyuki Fujita

Shinji Fujita

Toshiro Fujimori

Shuji Katoh

Kenichi Kawamura

Kohei Yamaguchi

Satoshi Ichimura

Yasuhiro Kiyofuji

Shigenori Inoue

Kazuo Miyoshi

Jun Nukaga

Li Lu

Hiroshi Miyao

Ryo Akiyoshi

Makoto Kadowaki

A stationary induction electrical apparatus includes a disc winding having a structure in which a flow path for a cooling medium is provided between coils where a low voltage is generated between shield wires, an L-shaped insulation barrier is provided between coils where a high voltage is generated between the shield wires, a horizontal portion of the L-shaped insulation barrier is provided so as to closely contact an upper surface or a lower surface of the disc coil, a tip end portion in an axial direction of the L-shaped insulation barrier is provided so as to closely contact an inner surface of the disc coil which is adjacent to a pressboard insulation cylinder, and a height of the tip end portion in the axial direction is lower than a thickness of one coil.

Stationary induction electrical apparatus

The present disclosure relates to a boiler water supply preheater system which preheats water (boiler water supply) supplied to a boiler by a predetermined preheating means, wherein the preheating means is a Rankine cycle (thermal cycle) which moves heat of a waste heat source in the boiler to the boiler water supply to perform preheating and drives a generator to generate electric power using a heat medium.

Boiler water supply preheater system and boiler water supply preheating method

A wireless communication apparatus, a wireless communication system and a wireless communication method that can suppress the occurrence of differences in transmission delays in a plurality of wireless lines are provided. The wireless communication apparatus () includes a division means () and a transmission means (). The transmission means () transmits radio waves through a plurality of wireless lines. The division means () divides data into data pieces having sizes each of which correspond to the transmission capacity of a respective one of the plurality of the wireless lines and generates a plurality of fragments. Further, the transmission means () transmits each of the plurality of the fragments to another wireless communication apparatus through the wireless line having the transmission capacity corresponding to the size of the fragment.

Wireless communication apparatus, wireless communication system, and wireless communication method

A power conversion apparatus including a three-phase transformer having at least four three-phase windings, and three converter arms each configured by connecting one or plural unit converters each including a switching device and an energy storage element in series. A power source or a load is connected to a first three-phase winding of the transformer, three series circuits which connects second and third three-phase windings of the transformer, and the converter arms in series with each other are connected in parallel, the parallel connection point is a DC terminal, and a magnitude relationship between a coupling coefficient of the first and second three-phase windings, and a coupling coefficient of the first three- and third three-phase windings is equal to a magnitude relationship between a coupling coefficient of the fourth and second three-phase windings, and a coupling coefficient of the fourth and the third three-phase windings.

Power conversion apparatus and high-voltage DC transmission system

A wireless communication apparatus of the present invention that uses an adaptive modulation radio scheme, includes: two-system transmission paths of an active system transmission path and an auxiliary system transmission path; a line information acquiring unit that acquires line information indicating line states of the active system transmission path and the auxiliary system transmission path; and a signal processing unit that determines whether or not a fault occurs in the active system transmission path and the auxiliary system transmission path, based on the line information acquired by the line information acquiring unit. The signal processing unit performs a setting so as to perform wireless communication using the two-system transmission paths of the active system transmission path and the auxiliary system transmission path, in a case of determining that a fault does not occur in the active system transmission path and the auxiliary system transmission path. The signal processing unit performs a setting so as to perform wireless communication using only the transmission path in which a fault does not occur among the active system transmission path and the auxiliary system transmission path, in a case of determining that a fault occurs in either one of the active system transmission path and the auxiliary system transmission path.

Wireless communication apparatus and wireless communication method

Growing community of inventors

Tokyo, Japan

Hideki Ogata