Abstract: Herein disclosed is a gas switch comprising: a body casing having an arc-extinguishing gas such as the SF6 gas and the like confined therein; bushings having their inner end portions inserted into said body casing; a rod-shaped stationary electrode and a hollow stationary electrode attached to the inner end portions of the bushings movable electrodes contacting with the rod-shaped stationary electrode at all times and made movable into and out of contact with said hollow stationary electrode; insulated bearing sleeves bearing the movable electrodes, respectively; a plurality of rocking arms for rocking in association with the turn of a drive shaft so that the movable electrodes are linearly moved through the insulated bearing sleeves by the rocking motions of the rocking arms to open and close the gas switch; and a connecting mechanism for connecting the rocking arms to the insulated bearing sleeves, respectively.

Abstract: The present invention relates to a gas switch provided with a body case wherein a switching unit is installed and an arc-extinguishing gas such as sulfur hexafluoride (SF6) or the like is enclosed at a constant pressure, and an actuating mechanism for operating the switching unit. When a pressure of the arc-extinguishing gas comes lower than a predetermined value, a lock member is disposed to a working position whereat it engages with the actuating mechanism, the actuating mechanism is thus locked unoperatably, and a display member is ready for observing externally in accordance with a shift of the lock member. Operators then carry out works for maintenance and check of the gas switch as ensuring the state wherein a gas pressure drops in the body case and the actuating mechanism has been locked.

Abstract: Herein disclosed is a gas switch comprising: a body casing having an arc-extingushing gas such as the SF6 gas and the like confined therein; bushings having their inner end portions inserted into said body casing; a rod-shaped stationary electrode and a hollow stationary electrode attached to the inner end portions of the bushings movable electrodes contacting with the rod-shaped stationary electrode at all times and made movable into and out of contact with said hollow stationary electrode; insulated bearing sleeves bearing the movable electrodes, respectively; a plurality of rocking arms for rocking in association with the turn of a drive shaft so that the movable electrodes are linearly moved through the insulated bearing sleeves by the rocking motions of the rocking arms to open and close the gas switch; and a connecting mechanism for connecting the rocking arms to the insulated bearing sleeves, respectively.

Abstract: An overcurrent display device is described which is suspended directly from a distribution cable for locating the spots of earthing, short-circuiting or other accidents in a distribution line system and is adapted to display the passage of the transient overcurrent due to such accidents through the cable for a predetermined time and to be restored to the original state before the display of the overcurrent condition. The device consists of an overcurrent sensing circuit, a drive unit including a drive element driven by the sensing circuit and a display unit actuated by the drive unit and adapted to achieve a display operation.

Abstract: An overcurrent condition display suspended directly from a distribution cable for displaying overcurrent conditions in the cable and for promptly locating spots of accidents due to overcurrent conditions comprises a current sensor section having a current transformer, a drive section provided with a drive element adapted to be driven by the sensed overcurrent and with a force storage member adapted to be actuated by the drive element and to act as a restoring member as well for the drive element, a drive-transmission section actuated by the force storage member and a display section having a display tube with a transparent bottom, a viscous fluid stored in the tube and a display element connected to the drive-transmission section for vertical motion through the fluid. The overcurrent condition is displayed when the display element is hoisted by the drive-transmission section.

Abstract: An open fuse cutout has a built-in lightning arrester. A supporting insulator has an attachment hole extending substantially perpendicularly to the axis thereof with the lightning arrester element fixedly fitted in the attachment hole. The lightning arrester element has a charging electrode held in abutment against either one of upper and lower electrodes, and a grounding electrode confronting a grounding member across a spark gap.

Abstract: An open fuse cutout has a built-in lightning arrester. The open fuse cutout includes a supporting insulator with a protective cap fixed to an upper end thereof and containing the lightning arrester disposed laterally or vertically. The lightning arrester element has a charging electrode confronting an upper electrode across a first spark gap and a grounding electrode confronting a grounding member across a second spark gap.