Kabushiki Kaisha Toshiba

Tokyo Shibaura Denki Kabushiki Kaisha

Takaaki Sakakibara

Shiro Maruyama

Toshihiro Hoshino

Kyoichi Uehara

Katsumi Konishi

Masayuki Akazaki

Yoshihiro Kanno

A partial discharge detector for gas-insulated electric apparatus of an embodiment detects an electromagnetic wave ascribable to partial discharge in a gas-insulated electric apparatus which is filled with insulating gas, and in which a conductor to which high voltage is applied is supported in conductor supporting holes provided at centers of a plurality of disk-shaped insulating plates, and a plurality of flanged-conductive pipes form a hermetically sealed container, with flange portions thereof pressingly sandwiching and holding peripheral edge portions of the insulating plates from both surface sides. The partial discharge detector for gas-insulated electric apparatus of this embodiment is characterized in that an antenna detecting the electromagnetic wave is disposed in close contact on a portion, of each of the insulating plates, exposed from the flange portions of the flanged conductive pipes, via an elastic member capable of transmitting the electromagnetic wave.

Partial discharge detector for gas-insulated electric apparatus

The present invention provides a high-performance partial discharge detection device which is user-friendly and compact and which allows detection of the electromagnetic waves caused by partial discharge, over a wide bandwidth with a simple constitution and a favorable S/N ratio. The waveguide antenna which receives electromagnetic waves that leak from the insulating spacer is attached to the outer circumferential face of the insulating spacer. The waveguide antenna is constituted by a waveguide portion and a coaxial cable connector which is installed on the waveguide portion. The waveguide portion has a metal short-circuit plate provided at one end thereof, and an opening formed at the other end thereof, which covers part of the outer circumferential face of the insulating spacer.

Partial discharge detection device

A data acquisition and transmitting unit samples the signal indicating the apparatus state quantity from a sensor provided on an apparatus, converts the signal into absolute-time-tagged monitoring data S(t), stores the data S(t), and transmits the data S(t) to a network. A digital protection and control unit takes in the quantity data E about the system of the apparatus and the operating state data P about the apparatus, converts these data into absolute-time-tagged data E(t) and operating state data P(t), stores these converted data, and transmits these data E(t) and P(t) to the network. A data display unit receives the data S(t), E(t), and P(t) from the data acquisition and transmitting unit and digital protective and control unit via the network and displays the state of the apparatus on the basis of the data S(t), E(t), and P(t).

Apparatus monitoring system and apparatus monitoring method

A system and method for detecting partial discharge of gas-insulated switchgear wherein a high-frequency component and the fundamental wave component of the voltage applied to the conductor of the gas-insulated switchgear are detected, the zero-cross point of the fundamental wave component is set as the starting point for the voltage, and the presence of partial discharge and the reason for the occurrence of partial discharge are ascertained based on the phase difference between the phase of the detected high-frequency component and the phase of the starting point of the voltage.

System and method for detecting partial discharge of gas-insulated

A three-phase gas insulated bus has three high voltage conductors inside a grounded cylindrical metal sheath filled with an insulating gas. The conductors are integrally supported by a single spacer having three supporting parts. The spacer is radially slidably coupled with the inner wall of the sheath.

Growing community of inventors

Yokohama, Japan

Takaaki Sakakibara