Kabushiki Kaisha Toshiba

Toshihiro Hoshino

Shiro Maruyama

Takaaki Sakakibara

Azumi Komaki

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

A gas insulated device includes a grounded metal container that covers a high-voltage conductor with a space interposed between itself and the high-voltage conductor; and an insulating spacer that is held and fixed between an end flanges on its outer side and supports the high-voltage conductor on its inner side. The insulating spacer has an internal shield that is buried in the insulating portion so as to surround the high-voltage conductor; grounding bars having conductivity whose one end is electrically connected to the internal shield and the other end extends to the outside of the insulating portion so as to be connected to the grounded metal container; a measurement bar having conductivity whose one end is electrically connected to the internal shield and other end extends to the outside of the insulating portion so as to be connected to the partial discharge measurement terminal.

Gas insulated device

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.

Growing community of inventors

Yokohama, Japan

Toshihiro Hoshino