Kabushiki Kaisha Toshiba

The Furukawa Electric Co., Ltd.

Oki Electric Industry Co., Ltd.

Ricoh Company, Ltd.

Toshiba Solutions Corporation

Toshiba Corporation

Furukawa Electric., Ltd.

Fuji Die Co., Ltd.

Minoru Saito

Hiroyuki Maehara

Shiro Maruyama

Tadashi Koshizuka

Yoshimasa Sato

Koji Suzuki

Hiroki Tanaka

Hideo Fukuda

Makoto Onodera

Yoshihiro Arashitani

Minoru Kasahara

Noriyuki Nagayama

Minoru Sakai

Yasuo Nakajima

Isamu Kobayashi

Takashi Nakajima

Tsuneo Aoi

Yasushi Ogawa

Naoki Wakasugi

Kei Kawasaki

Toshiyuki Shimizu

Hiroaki Ito

Nobuyuki Takahashi

Yasuhiro Fukuda

Hideyuki Ikeda

Masao Takahashi

Yoshito Sameda

Jun Takehara

Susumu Nishiwaki

Norio Hirashita

Kouji Mochizuki

Isao Tomomatsu

Kojiro Inamori

Kazuo Chiba

Hirotaka Watanabe

Seiichiro Tanaka

Tomonori Nishida

Kazuya Hashimoto

Dai Fujiwara

Noriyoshi Suga

Osamu Hosokawa

Shigeki Katayama

Yong Hoon Kim

Osamu Terada

Shin Hasegawa

Masayuki Ishii

Yasushi Horie

Yukio Ishii

Hachidai Ito

Tatsuji Tanaka

Kouji Mochiduki

Hiroshi Kusuyama

Hidenao Ubukata

Nobumitsu Samukawa

Yoshiroh Someya

Koichi Futagami

Toshiyuki Saida

Noriyoshi Fushimi

Midori Murayama

Chikara Kishi

Ryosuke Sako

Kazumi Hanada

Kentaroh Murakawa

Mitsuhiro Matsuo

Keisuke Udagawa

Setsuo Tamura

Masayuki Kosakada

Yuuji Minami

Hiromi Nagasaki

Koichi Hamamatsu

Hosaku Sato

Kazutoshi Ayusawa

Hiroyuki Hayata

Daisuke Maeno

Tsuyoshi Kokumai

Tomohiko Mitani

Daisuke Imamura

Tokuo Ito

Tetsuhiko Sugahara

Masayuki Kobayakawa

Fumitaka Yokoyama

Matsue Nakayama

Yukihiko Maede

Wataru Yamamori

Takaya Shono

Junichi Ishizuka

Yuichi Handa

Kazuhiko Tsuchiya

Tadashi Koshiduka

Saki Suzuki

Kozo Kitamura

Koji Hayashi

Xiao Chuan Zhu

According to one embodiment, an excitation inrush current suppressing apparatus comprising: bus voltage measurement equipment which measures each phase voltage of the single-phase AC-side bus; transformer voltage measurement equipment which measures a single-phase-side voltage of the transformer; phase detector which detects a cutoff phase when opening the circuit breaker by monitoring each phase voltage measured by the bus voltage measurement equipment and the single-phase-side voltage measured by the transformer voltage measurement equipment, holds the detected cutoff phase, and outputs the same phase as the held cutoff phase; and close command output device which closes the circuit breaker by the same voltage phase as the cutoff phase output from the phase detector.

Excitation inrush current suppressing apparatus and excitation inrush current suppressing method

A partial discharge monitoring system includes: electromagnetic wave detection sensors disposed in insulating gas enclosures being objects to be monitored, converting devices, and an interface device. The interface device includes: a detecting part detecting a zero cross point of a voltage signal synchronous with a voltage signal applied to conductors disposed in the insulating gas enclosures, and deciding a sampling timing of signals of electromagnetic waves; a transmitting part notifying the sampling timing decided by the detecting part to the converting devices; an integrating part integrating digital data which are received from the converting devices on per converting device basis; and a transmitting part transmitting the integrated digital data to a monitoring device.

Partial discharge monitoring system and partial discharge monitoring method

The purpose of the present invention is to provide, by a configuration or method different from conventional art, a coated optical fiber enabling reduced interface delamination between a glass fiber and a primary coating layer when the coated optical fiber is immersed in water, and a reduction of transmission loss increase. A coated optical fiber according to one embodiment of the present invention is provided with a glass fiber, a primary coating layer coated on the glass fiber, a secondary coating layer coated on the primary coating layer, and a colored layer coated on the secondary coating layer. The coated optical fiber is configured so that small water bubbles are generated substantially evenly within the primary coating layer when the coated optical fiber is immersed for 200 days in warm water of 60&#xb0; C.

Coated optical fiber, optical fiber ribbon, and optical cable

According to one embodiment, a magnetizing inrush current suppressing device is configured to measure a three-phase alternating current flowing from the power supply bus to the load, detect a first interruption phase as a phase of an electric current which is interrupted first among the three phases, detect a phase of a phase voltage zero point through which a phase voltage of the first interruption phase of the three-phase AC voltage passes when changing from the same polarity as that of an electric current immediately before interruption of the first interruption phase to an opposite polarity, and close the circuit-breaker at a phase within 60&#xb0; from the detected phase.

Magnetizing inrush current suppression device

A client apparatus according to an embodiment includes a communication mode setup device, a communication pattern determination device, and a communication execution device. The communication mode setup device sets up an operation mode for executing the communication process in accordance with the individual process or a test mode for executing the substitute process. The communication pattern determination device determines a predetermined communication pattern name representative of a local pattern if the test mode is set up. The communication execution device acquires from the communication pattern management device communication component names and an order associated with the determined communication pattern name, and executes communication components in order.

Communication management program and client apparatus

According to one embodiment, an excitation inrush current suppression device for suppressing excitation inrush currents flowing through a breaker of the three-phase collective operation type for opening and closing connection is configured to measure a three-phase AC voltage of the power supply bus bar to calculate prospective magnetic fluxes of the transformer, and to measure a three-phase AC voltage on the transformer side to calculate residual magnetic fluxes of the transformer after shutoff, so as to set the breaker closed when polarities of the prospective magnetic fluxes respectively agree with polarities of the residual magnetic fluxes in all of the phases respectively.

Excitation inrush current suppression device

According to an embodiment, when a transformer that is connected to a first power supply through a first breaker as well as to a second power supply through a second breaker is detected to be disconnected from the power supplies, a specific phase of the three phases of the first breaker is closed to suppress an excitation inrush current, based on calculated residual magnetic fluxes and a voltage of the first power supply, and thereafter, the remaining two phases are closed. Based on the calculated residual magnetic fluxes and a voltage of the second power supply, a specific phase of the three phases of the second breaker is closed to suppress an excitation inrush current, and thereafter, the remaining two phases are closed.

Excitation inrush-current suppression system

According to one embodiment, a magnetizing inrush current suppressing device includes, a first closing unit closes the circuit-breaker at the notable phase by the first phase determined by the first-phase determination unit, a second-phase determination unit determines a second phase at which the notable phase detected by the notable phase detection unit from the three-phase AC voltage measured by the power-supply-side voltage measurement unit becomes a zero point after the first phase determined by the first-phase determination unit, and a second closing unit closes the circuit-breaker at two phases other than the notable phase by the second phase determined by the second-phase determination unit.

Magnetizing inrush current suppressing device

According to one embodiment, there is provided an inrush current suppression apparatus that suppresses an inrush current generated when shunt capacitors are connected to a power system. The apparatus includes a power supply voltage measurement unit measuring a power supply voltage, a circuit breaker current measurement unit measuring a circuit breaker current, a residual voltage polarity determination unit determining the polarities of three phases of a residual voltage, a specific phase determination unit determining a specific phase, a closing phase detector detecting a closing phase, and a circuit breaker closing unit closing the circuit breaker in the closing phase.

Inrush current suppression apparatus

An optical fiber ribbon according to the present invention includes a collective coating layer containing an ultraviolet curable resin containing amorphous PPG and an amorphous monomer, the collective coating layer formed around coated optical fibers. The collective coating layer has an equilibrium elastic modulus of 12 MPa to 20 MPa, both inclusive, and a yield point elongation of 5% to 9%, both inclusive, and the adhesion between the collective coating layer and the outermost layers of the coated optical fibers is 12 N/cm to 15 N/cm, both inclusive.

Optical fiber ribbon

According to one embodiment, there is provided a magnetizing inrush current suppression device. A closing phase determination unit determines a phase position for suppressing the magnetizing inrush current among phase positions in which the prospective magnetic flux calculated by the prospective magnetic flux calculation unit and the residual magnetic flux calculated by the residual magnetic flux calculation unit coincide between the lines of the minimum residual magnetic flux determined by the minimum residual magnetic flux determination unit, as a closing phase position. A closing unit simultaneously closes the three phases of the circuit-breaker at the determined closing phase position.

A colored optical fiber including a glass optical fiber; a primary coating layer that covers the glass optical fiber; a secondary coating layer that covers the primary coating layer; and a colored layer that coats the secondary coating layer. The relaxation modulus after 24 hours at 60&#xb0; C. of of the layers coated is 140 MPa or less.

Colored optical fiber, optical fiber ribbon and optical fiber cable, using colored optical fiber

A switching controller for circuit breaker in which a switching control arithmetic operation unit performs arithmetic operations to determine for each circuit breaker a synchronous delay count value which is sent to each switching command control unit of the corresponding circuit breaker, which upon receiving a switching command signal from a superordinate device, counts the synchronous delay count value D, to turn on a semiconductor switch of the switching command output unit after counting completes. The switching command signal (circuit breaker drive current) is output after the synchronous switching control to the circuit breaker drive coil of the circuit breaker. The switching controller can implement cost saving and space saving, even if switching of a circuit breaker in a lower branch system, such as a power distribution system, is controlled.

Switching controller and switching control system for circuit breaker

The present invention provides an optical fiber in which transmission loss is not easily increased when the optical fiber is dipped in water and then dried and also which has a solvent resistant property and a micro-bend resistant property. An optical fiber according to one embodiment of the present invention is an optical fiber in which at least two layers of coating resin coat the circumference of a glass optical fiber. When a Yang's modulus of the first coating layer of the coating resin is defined by PY (MPa) and an elution rate of the coating resin after dipping in 60&#xb0; C. hot water for 168 hours is defined by E (mass&#xb7;%), a formula of 1.8&#x2266;E&#x2266;8.61&#xd7;PY+1.40 is satisfied.

Optical fiber

In some embodiments, a method is disclosed that includes measuring a waveform of a power source side voltage of a circuit breaker; measuring a waveform of a transmission line side voltage of the circuit breaker; calculating a waveform of a voltage between contacts of the circuit breaker that is a difference between the waveform of the power source side voltage and the waveform of the transmission line side voltage; calculating a waveform of an absolute value of the waveform of the voltage between contacts; extracting a waveform of a component in a frequency band which is lower than a frequency of the power source and higher than a frequency of a DC component from the waveform of the absolute value; detecting a cycle of the extracted waveform; and closing the circuit breaker based on the cycle.

Overvoltage suppressing device

Growing community of inventors

Kamakura, Japan

Minoru Saito