JPH0246176Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a gas insulated switchgear with an improved 11/2DS type disconnector connection.

[Technical background of the invention and its problems]

In recent years, as the demand for electric power has increased, gas-insulated switchgears, which are electrical equipment with an insulating gas sealed in a container, have become the mainstay in substation equipment. This gas insulated switchgear has excellent performance such as easy maintenance and inspection and high reliability.

Here, FIG. 1 shows a general single line diagram of a gas insulated switchgear. The figure shows a 11/2DS type gas insulated switchgear. That is, 11/
The 2DS system is a system in which three disconnectors DS2, DS3, and DS4 are arranged in series between the main buses BUS1 and BUS2, and lines are connected between the disconnectors DS2 and DS3 and between the disconnectors DS3 and DS4, respectively. In Figure 1, one line is the line side line, and the line disconnector CB
1. Connected to air intake bushing BG via disconnector DS1. In the middle of this line side line are instrument current transformers CT1 and CT2, and a grounding device ES.
1. Instrument transformer PT and lightning arrester LA are incorporated. On the other hand, the other lines are bank side lines, and are connected to the cable head CH via the cable disconnector CB2. In the middle of this bank side line, instrument current transformers CT3 and CT4 and a grounding device ES2 are incorporated.

Further, FIG. 2 shows an example of the arrangement of equipment of the gas insulated switchgear according to the single line diagram shown in FIG. 1.

Furthermore, in Figure 3, both main buses BUS1, BUS
Disconnectors DS2, DS3 and DS4 placed between 2
This shows how the connections are made. That is, the vertical disconnect switches DS2 and DS4 are connected via the horizontal disconnect switch DS3. In other words, three disconnectors DS2,
DS3 and DS4 are arranged in a gate shape in relation to the main bus lines BUS1 and BUS2.

By the way, there are cases where a malfunction occurs due to an accident or the like, and it becomes necessary to remove the disconnectors DS3 and DS4, for example. Therefore, in order to enable the disconnectors DS3 and DS4 to be attached and detached, a detachment device 1 is provided between the disconnectors DS3 and DS4. In this case, attachment/detachment is carried out with the attachment/detachment conductor 1b in the attachment/detachment device 1a being removed and the bellows 1c being compressed, as shown in FIG. However, providing the removable container 1a or the like between the disconnectors DS3 and DS4 has the problem of complicating the structure of the gas insulated switchgear as a whole and leading to an increase in size.

[Purpose of invention]

It is an object of the present invention to eliminate the above-mentioned drawbacks, and to provide a gas-insulated switchgear which allows disconnectors to be attached and detached and which can be made compact.

[Summary of the idea]

In order to achieve the above object, in the present invention, the fixed part of the horizontal disconnector placed between the vertical disconnectors is placed inside the attachment/detachment device, the movable part is placed on the tank side, and the attachment/detachment device is placed between the vertical disconnectors. By making it possible to separate the gas-insulated switchgear and the tank, a removable container can be omitted, thereby providing a small-sized gas-insulated switchgear.

[Example of idea]

An embodiment of the present invention will be described with reference to FIGS. 5 and 6. Note that parts that are the same as or equivalent to those of a conventional gas insulated switchgear will be described using the same reference numerals. In Figure 5, the main bus line
A vertical disconnect switch DS2 is placed on BUS1,
By opening and closing this disconnector DS2, the line side circuit (not shown) and the main bus BUS1 are connected and disconnected. In the figure, the disconnector DS2 is shown in an open state. Similarly, a vertical disconnect switch DS4 is placed on the main bus BUS2, and this disconnect switch DS4
By opening and closing, the bank side line (not shown) and the main bus BUS2 are connected and disconnected. The figure shows the disconnector DS4 in an open state. Disconnector DS
A horizontal disconnector DS5 is connected between 2 and DS4 to form a so-called 11/2 DS type gas insulated switchgear. Between disconnectors DS2 and DS5 and between DS4 and DS
Insulating spacers 2 and 3 are provided vertically between the two, respectively, and the insulating spacers 2 and 3 are used to partition the gas. In addition, these insulating spacers 2 and 3 are disconnectors.
Horizontally arranged conductors 4 and 5 electrically connecting between DS2 and DS5 and between DS4 and DS5 are insulated and supported, respectively. Next, the structure of the disconnector DS5 will be explained in detail. A tank 6 is connected to the insulating spacer 2 on the side of the disconnector DS2, and a bellows 7 is connected to the insulating spacer 3 on the side of the disconnector DS4 as a telescopic attachment/detachment device. The tank 6 and bellows 7 are connected by flanges. This tank 6 and bellows 7 constitute a disconnector case. A movable part 8 is attached to the end of the conductor 4 on the side of the disconnector DS4 for electrical connection. Insulating spacer 3
There is a fixed part 9 on the disconnector DS2 side of the conductor 5 supported by
Install and connect electrically. The conductors 4, 5, the movable part 8, and the fixed part 9 are arranged substantially in a straight line. The free end of the fixed part 9 is disposed within the bellows 7, and the movable part 8 is horizontally translated by an operating device 10 provided on the tank 6 to bring it into contact with and separate from the fixed part 9. The disconnector DS5 is opened and closed by the contact and separation of the movable part 8 and the fixed part 9. In addition, in the same figure, disconnector DS5
shows the open state. Further, the free end of the movable part 8 is housed in the tank 6 when the disconnector DS5 is in the open state. That is, in this case, the movable part 8 is the tank 6
It is assumed that the fixing parts 9 are separately attached to the bellows 7.

Next, the procedure for disconnecting the disconnector DS4 will be explained. The movable part 8 of the disconnector DS5 is moved toward the disconnector DS2 and placed in the tank 6, and the disconnector DS5 is turned off. Thereafter, the tank 6 and the bellows 7 can be separated by compressing the bellows 7. That is, as shown in FIG. 6, the tank 6, the movable part 8, and the operating device 10 can be removed while being attached to the disconnector DS2 side, and the bellows 7 and the fixed part 9 are attached to the disconnector DS4 side. can. In other words, the disconnector DS5 can be separated into two parts: the movable part 8 side and the fixed part 9 side.

According to this embodiment, the removable container 1
a. No need for detachable conductor 1b, insulating spacer 3
Since the fixing part 9 is provided on the top, the length of the disconnector DS5 can be reduced. This allows the disconnect switch to
The space between DS2 and DS4 can be reduced, making it possible to downsize the gas insulated switchgear as a whole. Further, since the removable container 1a and the removable conductor 1b are not used and one insulating spacer is omitted, an inexpensive gas insulated switchgear can be provided. Furthermore, it is possible to reduce the weight, and maintenance and inspection can be performed easily and in a short time.

[Effect of idea]

As explained above, according to the present invention, a detachable container and the like are omitted by forming a disconnector in which a disconnector case is formed by a tank and a bellows that can be separated between a fixed part and a movable part. It is possible to provide a small gas insulated switchgear.

[Brief explanation of the drawing]

Figure 1 is a single line diagram showing an example of a gas-insulated switchgear, Figure 2 is a conventional configuration diagram of the equipment shown in Figure 1, and Figure 3 is an enlarged partial cross-sectional view of the 11/2DS system shown in Figure 2. , FIG. 4 is a diagram illustrating the disconnection of the disconnector shown in FIG. 3, and FIG. 5 is a partial cross-sectional view of a 11/2DS system of a gas-insulated switchgear showing an embodiment of the present invention.
FIG. 6 is a diagram illustrating disconnection of the disconnector shown in FIG. 5. BUS1, BUS2...Main bus, DS1, DS2,
DS3, DS4, DS5...Disconnector, CB1, CB2
...Shiya breaker, BG...Futsing, CT1,,
CT2, CT3, CT4...Instrument current transformer, BS1,
ES2...Grounding device, PT...Instrument transformer, LA
...Surge arrester, CH...Cable head, 1...Three-point reader attachment/detachment device, 1a...Detachable container, 1b...
... detachable conductor, 1c... bellows, 2, 3... insulating spacer, 4, 5... conductor, 6... tank, 7...
...Bellows, 8...Movable part, 9...Fixed part, 10
...Operation device.

Claims (1)

[Scope of utility model registration request] Two lines are connected by two main buses, first and second disconnectors connected to the two main buses, and a third disconnector connecting the first and second disconnectors. In the 11/2DS type gas insulated switchgear, the case of the third disconnector is formed of a bellows and a tank, and the conductor of the second disconnector is disposed within the bellows. A fixed part that is electrically connected is arranged, a movable part that is electrically connected to the conductor of the first disconnector and can be brought into contact with and separated from the fixed part is arranged on the tank side, and both the conductors and the fixed part are arranged. and a gas insulated switchgear, characterized in that the movable part is made substantially linear, and the third disconnector case can be separated between the bellows and the tank when opening.