JPH066647Y2 - Gas-insulated electrical equipment connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a device for connecting gas-insulated electrical devices.

[Prior Art] When constructing a substation with gas-insulated electrical equipment, the installation area can be greatly reduced by arranging the equipment three-dimensionally. Various configurations have been considered for the layout design of equipment according to the location conditions of the installation site. One example is the second example shown in Toshiba Review Vol. 35, No. 9, page 782.
Shown in the figure. In this configuration, one disconnector (1) is directly connected to a circuit breaker (3) via a current transformer (2) and installed on a foundation, and a busbar ( 5
a), (5b), and (5c) (hereinafter referred to as (5) when collectively described for three phases) are arranged, and the other disconnecting switch (6a) is provided above each phase busbar (5). (6b), (6
c) (hereinafter, referred to as (6) when collectively describing three phases) is connected to the circuit breaker (3) by the L-shaped connecting bus bar (4) for each phase. .

The containers such as the disconnectors (1), (6) and the circuit breaker (3) are made of steel or stainless steel depending on their current capacity. Al material may be used for the container of the connecting bus bar (4). When the gas-insulated electrical equipment configured in this way is operated, the parts of the circuit breaker (3) and the pedestal will be affected by the difference in the material of each part, the dimensional change due to the difference in the conditions of heat generation and heat dissipation, and the vibration at the time of the earthquake Relative displacement occurs with the upper busbar (5), but is absorbed by the L-shaped connecting busbar (4).

[Problems to be solved by the invention] With such a configuration, when the voltage class is low and the dimension is small, the amount of expansion and contraction caused by the temperature difference is small, and the vibration amplitude when an earthquake occurs is also small, so an L-shaped connection is made. It can be fully absorbed by the busbar, but like a gas-insulated electric device of 1000 kV class,
As the size of each part increases, the amount of expansion and contraction due to the temperature difference increases, and the amplitude when an earthquake occurs also increases, so that the L-shaped connecting busbar cannot be absorbed and a bellows is inserted in the container part of the connecting busbar (4). Therefore, it is necessary to take measures to absorb the amount of expansion and contraction. In addition, when the bellows is used, there is a problem that a large thrust force that spreads the bellows is generated by the high-pressure insulating gas filled inside the device.

This invention was made in order to solve the above problems, and even if a bellows is used, the bellows does not expand due to thrust, and the expansion and contraction amount due to temperature changes and the vibration amplitude at the time of an earthquake occur. It is an object to provide a connection device that can absorb.

[Means for Solving Problems] A connecting device for gas-insulated electric equipment according to the present invention has an opening on three sides of a connecting busbar between a circuit breaker and a busbar portion on a pedestal, and has two upper and lower openings. By using a T-shaped container having a bellows in one opening and an intermediate connecting container connected to the device via the bellows, a connecting member that opposes the thrust generated by the high-pressure insulating gas filled in the device It is configured to prevent the bellows from stretching.

[Operation] Connecting the circuit breaker (3) part on the foundation and the bus bar (5) part on the gantry is connected to the two openings of the T-shaped container for axial expansion and contraction of the connecting bus bar. It is absorbed by the bellows connected between the bellows and the intermediate connecting container and the equipment, and the horizontal displacement that occurs when an earthquake occurs is absorbed by the two bellows connected to the openings at both ends of the intermediate connecting container and filled inside. The thrust generated by the pressure of the generated high-pressure gas is supported by the connecting rod.

[Embodiment] An embodiment of a connecting device for gas-insulated electric equipment according to the present invention is shown in FIG. In FIG. 1, the circuit breaker (3) is on the foundation,
The bus bar (5a) and the disconnecting switch (6a) are installed on the mount (8) as in the conventional example shown in FIG. The connection between the circuit breaker (3) and the disconnector (6a) is such that the first opening (15a) of the T-shaped container (15) opening in three directions is connected to one opening of the disconnector (6a). The first bellows (11) is connected to the second opening (15b) at the lower part of the T-shaped container (15) in the vertical direction, and the third bellows (3) at the upper part of the T-shaped container (15) is connected.
A holding member (24) having a plurality of holes in its outer peripheral portion is fixed to the opening (15c) of the above, and a bellows (12), one of which is sealed by a sealing means (12a), is connected to the holding member (24).
Further, the other end of the bellows (11) connected to the second opening (15b) of the T-shaped container (15) and one end (16a) of the intermediate connection container (16) are connected to each other, and the intermediate connection container (16) ) The other end (16b) of the second pressing member (22)
Is fixed and the third bellows (13) is connected. The third bellows (13) is connected to the circuit breaker (3) by a connecting container (9) via a connecting flange.
A first pressing member (21) is arranged on the upper end surface of the second bellows (12) and is arranged at equal intervals in the outer circumferential direction between the second pressing member (22) and the holding member (24). A plurality of connecting rods (30) loosely fitted in the holes provided in the above are connected at predetermined intervals.

The T-shaped container (15), the intermediate connection container (16), the connection container (9) and the first and third bellows (11), (13) are provided with an internal conductor (14) at the center thereof and a circuit breaker. (3)
And the disconnector (6a) are electrically connected to each other, and the inside of each container is filled with high-pressure insulating gas.

The connecting device for gas-insulated electric equipment configured as described above causes a relative dimensional change due to a temperature change or an earthquake between the busbar (5) part and the circuit breaker (3) part on the pedestal (8). Although it occurs, the bellows (11), (12) and (13) that are operated by the internal high pressure gas even if a dimensional change occurs
The axial thrust of is countered by the connecting rod (30),
It is possible to absorb it and keep the hermetically sealed state without stress concentration on each part of the container.

That is, the relative displacement of the connecting conductor (14) and the container due to the temperature rise is caused by the bellows (11) and (13) extending in the extending direction.
The bellows (12) deforms in the compression direction, and the connecting rod (30)
The first holding member (21) and the second holding member (2
The bellows (11), (1
The predetermined dimensions of 2) and (13) are maintained, and the horizontal vibration of the busbar (5) on the pedestal (8) that occurs during an earthquake causes horizontal azimuth of the T-shaped container (15). On the other hand, the bellows (11) and (12) can be absorbed without applying stress to the container.

The vibration at the time of the earthquake has a considerably large amplitude and the connecting rod (30)
It is expected that the bellows will shift at the top of the bellows (12) or the bellows (12) will deform horizontally.
The connecting rod (30) is prevented from being displaced by loosely fitting and fixing the connecting rod (30) in the hole (24a) formed in the holding member (24) fixed to the letter-shaped container.

Above are the three bellows (11), (12) and (13)
However, if the bellows (11) and (12) and the intermediate connection container (16) are integrated into a single bellows, even a larger displacement can be followed.

[Advantage of the Invention] The gas-insulated electric device connection device according to the present invention is affected by a displacement caused by a temperature difference between a device installed on a foundation and a device placed on a stand, and vibration during an earthquake. With respect to the generated displacement, a predetermined size can be maintained against the thrust acting on the bellows by the high pressure gas inside, and the displacement in three directions can be absorbed without causing stress in the joint with the container. It is a thing.

[Brief description of drawings]

FIG. 1 shows a connecting device for gas-insulated electrical equipment according to the present invention, and FIG. 2 shows an installation example of conventional gas-insulated electrical equipment. (11), (12), (13) are bellows, (1
5) is a T-shaped container, (16) is an intermediate connecting container, and (2)
1) and (22) are pressing members, (24) is a holding member, and (3)
0) is a connecting rod.

Claims (1)

[Scope of utility model registration request] 1. A conductor is housed inside, a first opening is connected to one device, a second bellows is connected to the second opening, and one opening is sealed to the third opening. A T-shaped container to which the stopped second bellows is connected, one end of which is connected to the second opening of the T-shaped container through the first bellows, and the other end of which is connected through the third bellows The intermediate connecting container connected to the device, the first pressing member that abuts on the sealing portion of the second bellows connected to the third opening of the T-shaped container, and the other of the third bellows. A second pressing member fixed to the device side, and a holding member fixed to the third opening of the T-shaped container and having a plurality of holes, the first pressing member and the first pressing member. Between the pressing member of 2
A connecting device for gas-insulated electric equipment, wherein the connecting members are connected at predetermined intervals by connecting rods loosely fitted in the holes formed in the holding member.