Abstract: A gas-sealing member 22 surrounds an opening 5b of a hermetically sealed container 2 and is brought into airtight contact with periphery of the opening 5b. An outer gas seal guide 20 holds the gas-sealing member 22 surrounding the outer circumference of the member 22 and brings the member 22 into contact with the periphery of the opening 5b. An inner gas seal guide 21 holds the gas-sealing member 22 along inner circumference of the member 22 and brings the gas-sealing member 22 into contact with the periphery of the opening 5b. The gas-sealing member 22, outer gas seal guide 20 and inner gas seal guide 21 are disposed between the periphery of the opening 5b of the hermetically sealed container 2 and a member airtightly connected to the periphery of the opening, thus establishing an airtight connection between the periphery of the opening 5b and the member airtightly connected.

Abstract: A gas-insulated switchgear comprising a gas-insulated first hermetic vessel, at least one electric device selected from a group consisting of an interrupter, a disconnector, a grounding switch and a load switch contained within the hermetic vessel. The switchgear also comprises a cable bushing having a first end that passes through and is secured to a lower vessel wall of the first hermetic vessel and connected to the electric device and a second end that is connectable to a cable, and bus conductor bushings mounted to the hermetic vessel. The switchgear may further comprise a second gas-insulated hermetic vessel disposed between the first vessel and the bus conductor, containing a disconnector or a disconnector and a grounding switch together, and an electrically insulated sealed terminal. The switchgear is compact and inexpensive, free from the damegaes by the explosive phenomenon due to the arc short-circuiting faults.

Abstract: A drawing apparatus constructed such that a screw rod 17 having an axis center along a drawing direction of an electrical machinery 1 is rotatably supported by a floor portion 11a of a drawing type electrical machinery accommodating portion 11 of a switch gear, a nut 19 engaged with a lower portion of the electrical machinery 1 is screwed with the screw rod 17, the nut 19 is moved by rotating the screw rod 17, and the electrical machinery 1 is driven in a direction of inserting or drawing out, whereby the drawing apparatus is commonly used for various drawing-type electrical machineries regardless of sizes of the electrical machineries.

Abstract: A drawing apparatus constructed such that a screw rod 17 having an axis center along a drawing direction of an electrical machinery 1 is rotatably supported by a floor portion 11a of a drawing type electrical machinery accommodating portion 11 of a switch gear, a nut 19 engaged with a lower portion of the electrical machinery 1 is screwed with the screw rod 17, the nut 19 is moved by rotating the screw rod 17, and the electrical machinery 1 is driven in a direction of inserting or drawing out, whereby the drawing apparatus is commonly used for various drawing-type electrical machineries regardless of sizes of the electrical machineries.

Abstract: A gas-insulated switchgear comprising a gas-insulated first hermetic vessel, at least one electric device selected from a group consisting of an interrupter, a disconnector, a grounding switch and a load switch contained within the hermetic vessel. The switchgear also comprises a cable bushing having a first end that passes through and is secured to a lower vessel wall of the first hermetic vessel and connected to the electric device and a second end that is connectable to a cable, and bus conductor bushings mounted to the hermetic vessel. The switchgear may further comprise a second gas-insulated hermetic vessel disposed between the first vessel and the bus conductor, containing a disconnector or a disconnector and a grounding switch together, and an electrically insulated sealed terminal. The switchgear is compact and inexpensive, free from the damegaes by the explosive phenomenon due to the arc short-circuiting faults.