Kabushiki Kaisha Toshiba

Toshiba Energy Systems & Solutions Corporation

Toshiba Energy Systems & Solutions Coporation

Takashi Harakawa

Atsushi Yamamoto

Akira Tanaka

Akira Fujimoto

Tetsushi Okamoto

Makoto Takanezawa

Yoshihiro Taniyama

Satoshi Hiroshima

Fumio Sawa

Masamitsu Sakuma

Norio Takahashi

Masafumi Fujita

Mikio Kakiuchi

Koji Ando

Yasuo Kabata

Hiroshi Hatano

Yoshiyuki Inoue

Naoki Shibukawa

Ken Nagakura

Kenichi Yamazaki

Hiroaki Ishizuka

Masashi Kobayashi

Yo Sasaki

Makoto Kawahara

Kazunori Shioda

Tooru Ootaka

Hidehito Matsuzaki

Wataru Nakamura

Tadayuki Hashidate

Yoshihiro Hyodo

Takaaki Hirose

Hiroaki Cho

Toshihiko Shinoda

Miki Nakamura

Shinji Kubo

Ryo Fuchimoto

Hirotaka Tsubakihara

A partial discharge measurement system including at least one sensor configured to detect a voltage signal propagating through a conductor connected to a rotating electrical machine in a non-contact manner, a first bandpass filter configured to pass a component of a first frequency included in the voltage signal therethrough, a second bandpass filter configured to pass a component of a second frequency included in the voltage signal therethrough, the second frequency being lower than the first frequency, a phase acquirer configured to acquire a phase waveform of the component of the second frequency having passed through the second bandpass filter, and an output interface configured to output information by which a component of partial discharge of the rotating electrical machine included in the component of the first frequency having passed through the first bandpass filter can be identified based on the phase waveform.

Partial discharge measurement system that includes a first bandpass filter and a second bandpass filter and partial discharge measurement method

The present embodiment provides a partial discharge measurement apparatus configured to detect partial discharge generated in a rotating electrical machine supplying or receiving power via an insulated conductor, where the apparatus comprises a calibration signal generator, a sensor, a compensation processor, and a signal processor. The calibration signal generator is configured to supply a calibration signal to a surface of an insulating layer of the insulated conductor. The sensor is configured to measure a physical quantity regarding the partial discharge. The compensation processor is configured to use an output signal of the sensor when the calibration signal has been supplied to generate a compensation coefficient. The signal processor is configured to process the output signal of the sensor based on the compensation coefficient.

Partial discharge measurement apparatus, partial discharge measurement method, and partial discharge measurement system

According to one embodiment, a rotor includes a coil slot, a sub-slot, and coil airflow paths arranged in the rotor axial direction. At least one coil airflow path among the coil airflow paths includes a first wall surface disposed on a core central portion side of a cooling gas inlet portion of the coil airflow path, a second wall surface disposed on the core central portion side of an inside of the coil airflow path, and located more on the rotor radially outward side and more on a core end portion side than the first wall surface, and a third wall surface configured to connect the first wall surface and the second wall surface, the third wall surface including a surface perpendicular to a rotor radial direction.

Rotor with coil airflow paths

According to one embodiment, an insulation diagnostic system comprising: a peak-value acquisition circuit configured to acquire at least one peak value of a section corresponding to local discharge of a voltage signal acquired by at least one sensor that detects the voltage signal in a non-contact manner; a function acquisition circuit configured to acquire a calculation function for calculating charge amount related to the discharge based on at least two peak values acquired from the voltage signal that is detected by the sensor by applying a test voltage to a rotating electrical machine while the rotating electrical machine is stopped; and a charge-amount calculation circuit configured to calculate the charge amount related to partial discharge of the rotating electrical machine based on the calculation function and the peak value obtained from the voltage signal that is detected by the sensor during operation of the rotating electrical machine.

Insulation diagnostic system and insulation diagnostic method

According to one embodiment, there is provided a rotating electrical machine coil with a conductor and an insulation layer that is provided around the conductor to cover the conductor, the rotating electrical machine coil including a linear part of the coil and a coil end that is separable from and electrically connectable to the linear part of the coil.

Rotating electrical machine coil

An erosion resistant material has a continuous portion and discontinuous portions. The continuous portion has a continuous structure. The discontinuous portions are arranged inside the continuous portion to have a discontinuous structure. The discontinuous portions are formed of particles having an average particle diameter of 1 &#x3bc;m or less. Further, the discontinuous portions are formed of a material having a surface hardness and a Young's modulus higher than those of the continuous portion.

Erosion resistant material and turbine blade

According to one embodiment, there is provided a rotating electrical machine including a core, a coil extending from the core, and an electromagnetic shield which is provided outside the core, and has a plurality of shoulders projecting toward the coil. The coil includes an insulator covering outside of a conductor, a resistance layer formed on a surface of the insulator and contacting the core, and at least one potential grading layer formed on a surface of the insulator adjacent to the resistance layer. A boundary between the resistance layer and potential grading layer is provided at a position farther from the core than a point on a surface of the coil, where a distance between the coil and a shoulder of the electromagnetic shield closest to the core is the shortest.

Rotating electrical machine and coil

Growing community of inventors

Yokohama, Japan

Takashi Harakawa