JPS5952615B2 - 3-phase all-in-one busbar - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a three-phase finger-shaped busbar in which three-phase busbar conductors are collectively housed in a cylindrical container, and in particular, the installation of an insulating spacer to support the busbar conductor is structured. Regarding.

[Prior art]

In recent substations, the conventional air insulation method has been replaced with SF
Switching equipment that has been miniaturized by switching to an insulation method using an insulating medium such as 6 gas is being used.

This type of switchgear equipment using SF6 gas is called gas insulated switchgear equipment, and is generally configured to be separated into three phases of alternating current.

In contrast to this phase-separated structure, a three-phase integrated structure in which three phases are integrated is known.

The three-phase finger-shaped gas insulated switching equipment accommodates three-phase charging section conductors in a common container filled with SF6 gas, and supports the charging section conductors while electrically insulating them from the common container.

By the way, in gas-insulated switchgear equipment, the gas chamber is divided into multiple sections in order to minimize the spread of an accident.

The insulating spacer performs this gaseous division.
It is approximately disk-shaped and has an embedded conductor in the center.

By electrically and mechanically connecting this embedded conductor to the charging section conductor and sandwiching the outer periphery of the insulating spacer between the containers, the insulating spacer simultaneously electrically insulates and supports the charging section conductor from the container.

A three-phase finger-shaped insulating spacer has a three-phase embedded conductor and has almost the same structure, but it is difficult to manufacture a large-capacity one mainly due to casting problems.

Therefore, in three-phase finger-type gas insulated switchgear equipment, it is conceivable to use three single-phase insulating spacers that were used in the phase-separated type.

. An example of gas insulated switchgear equipment is shown in FIG.
It is configured as a gas insulated system.

In many cases, a three-phase all-in-one configuration is adopted for the bus bar 4 that does not have an opening/closing section.

As shown in FIGS. 2 and 3, the insulating spacer includes a support plate 6 having three through holes, and a single spacer provided corresponding to each through hole in the support plate 6 to seal the through hole. Consists of phase insulating spacers 7U, 7V, and 7W.

Each single-phase insulating spacer has embedded conductors 8U, 8V, and 8W in the center, respectively.

As shown in FIG. 4, the three-phase finger-shaped insulating spacer unit constructed in this manner has the support plate 6 attached to the flanges 9a, 10a of the large-diameter containers 9, 10, as in the case of the phase-separated construction.
Attach by holding it in between.

Since the large-diameter containers 9 and 10 are approximately cylindrical, their diameters must be larger than the diameter of the virtual circumscribed circle formed by the three single-phase insulating spacers.

This determines φ1.

However, in the portion without the insulating spacer, the bus bar tube 11 having a diameter of φ2 is sufficient due to the insulating properties of SF6 gas.

Therefore, two large-sized large-diameter containers 9 and 10 having a diameter of φ1 are required to attach the insulating spacer.

Since the flange of each container has an airtight surface, it is not easy to manufacture, and the large flange significantly increases the weight of the container.

Furthermore, the overall diameter is determined by the outer diameter φ3 of the flange.

Therefore, in order to be able to remove the busbars 4 shown in Fig. 1 for each gas classification unit, it is necessary to secure a distance corresponding to φ3 between the four busbars and the busbar 4 and the breaker 3. This will make the insulated switchgear equipment larger.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and its purpose is to provide a three-phase finger-shaped generatrix with a reduced maximum diameter by reducing the number of large containers, especially the number of flanges that serve as airtight surfaces. .

[Summary of the invention]

In the present invention, the other surface of a support plate having three single-phase insulating spacers fixed to one surface is attached to the inner wall surface of a large-diameter container.

In other words, in the conventional example shown in Fig. 4, the support plate to which three single-phase insulating spacers are fixed is sandwiched between the flanges of the container, so the virtual circumscribed circle created by the three single-phase insulating spacers A flange with an inner diameter of approximately 2 is required.

On the other hand, in the present invention, as will be understood from the embodiments described below with reference to the drawings, there is no flange for holding the support plate.

In other words, the support plate is attached to the inner wall surface of the container, thereby making it possible to reduce the outer diameter of the generatrix.

Note that the busbar referred to in the present invention includes not only the dedicated busbar shown in Fig. 1, but also the connection busbar that connects each switchgear, and includes gas-insulated switchgear equipment or oil-insulated switchgear equipment, which is collectively referred to as closed type switchgear equipment. Applicable to switchgear equipment.

[Embodiments of the invention]

Figure 5 shows a three-phase finger-shaped insulating spacer unit, in which three single-phase insulators are arranged corresponding to three through holes 20U, 20V, and 20W formed in a support plate 6 made of an insulator or metal. The spacers 7U, 7V, and 7W are each fixed to the support plate 6 with bolts to airtightly seal each through hole.

Each single-phase insulating spacer is molded with embedded conductors 8U, 8V, and 8W in the center of the warp, respectively, and the embedded conductors are electrically and mechanically connected to the bus conductor.

This three-phase finger-shaped insulating spacer unit is attached as shown in FIG. 6 to form a three-phase collective busbar.

The large-diameter container 21 has internal flanges 21a and 21b welded to both axial ends thereof.

The internal flange is a flange formed inside the large diameter container 21.

Therefore, the maximum diameter of the large diameter container 21 is φ1 of the cylindrical portion.

An internal flange 22 is integrally formed on the inner wall surface of the cylindrical portion of the large diameter container 21 by welding or the like.
Before welding one internal flange 21a or 21b, the support plate 6 of the insulating spacer unit shown in FIG. 5 is airtightly attached with bolts or the like via a sealing material.

As a result, the inside of the large-diameter container 21 is fluidly separated at the middle portion thereof.

The busbar tubes 23 and 24 to which the large-diameter container 21 is connected have external flanges 23a and 24a that protrude to the outside.

Therefore, the maximum diameter of the busbar tube 23, 24 is the outer flange 23.
a, the outer diameter of 24a.

The outer flange 23a is connected to the inner flange 21b, and the outer flange 24a is connected to the inner flange 21a in a gas-tight manner.

Although not shown, three
The phase busbar conductors are electrically and mechanically coupled to buried conductors 8U, 8V, 8W, respectively.

The maximum diameter of the three-phase collective bus bar configured in this way is the container 21.
That is, the outer diameter of the outer flanges 23a, 24a of the busbar tube 23.24 without an insulating spacer.

This means that even if a three-phase finger-shaped insulating spacer unit is used, the outer diameter of the three-phase finger-shaped bus bar will not be increased.

In this embodiment, since there is no flange for holding the support plate 6, the large diameter container 21 is made lighter accordingly.

Further, since the support plate 6 can be supported and fixed within the container 21, the flanges 9a and 10a shown in FIG. 4 which sandwich the support plate 6 can be omitted.

FIG. 7 shows a three-phase finger-shaped busbar of a different embodiment, and the difference from FIG. 6 is the attachment of the support plate 6.

That is, in this embodiment, the internal flange 21a of the container 21
A support plate 6 is attached to the support plate 6 in an airtight manner.

At this time, the support plate 6 is attached to the internal flange 21a on the side opposite to the side on which the single-phase insulating spacers 7U, 7V, and 7W are attached.

If the support plate 6 is installed with the surface reversed, that is, the support plate 6
When installed so that the right end surface in the figure is in contact with the internal flange 21a, the single-phase insulating spacer 7W contacts the internal flange, further increasing the diameter of the large-diameter container 21, and the busbar tube 24 is connected to the large-diameter container 21. They must have the same diameter, and the insulating properties of the insulating medium filled in the busbar tube 24 cannot be utilized, resulting in an unnecessarily large size.

Further, as is clear from the drawings, the internal flange 21a must be changed to an external flange, which further increases the maximum diameter.

Note that the support plate 6 may be attached to the internal flange 21b if the above-mentioned attachment takes surface considerations into consideration.

According to such an embodiment, the internal flange 22, which is an annular projection shown in FIG. 5, can be omitted, so that the large diameter container 21 becomes even lighter.

In addition, since the axial length of the large-diameter capacity 21 can be shortened, the weight can be further reduced, and even when the large-diameter container 21 and the insulating spacer unit are treated as an integrated unit,
This makes it easier to connect the two.

As can be seen from the above embodiments, in the present invention,
The support plate 6 may be attached to the inner wall surface portion of the large-diameter container 21 between the opposing inner flanges 21a and 21b.

In the present invention, it is also possible to connect a bellows device in the middle of a three-phase collective busbar as is conventionally done, and the outer sheath of the bellows device can be connected to the busbar tube 23, 24 or a part of the large diameter container 21. It may be treated as

Further, it is sufficient that the embedded metal fittings 8U, 8V, 8W and the bus conductor are electrically connected at least through tulip-shaped contacts.

This means that the bus conductor is supported by the large-diameter container 21 or the bus tube 23.
, 24 can be mechanically supported by insulators or the like provided in the radial direction of the busbar conductors, so that the busbar conductor does not need to be mechanically fixed to the embedded metal fitting as long as it is electrically connected.

If a tulip-shaped contact is used, placing it near the connection between the flanges will prevent the large-diameter container 21 and the busbar tube 23.2.
It becomes easy to separate the four.

〔Effect of the invention〕

As explained above, in the present invention, internal flanges 21a and 21b are formed at both ends of the large-diameter container 21, and external flanges 23a and 2
4a and to which three single-phase insulating spacers are fixed is attached to the inner wall surface between the opposing internal flanges of the large-diameter container 21. The outer diameter of the outer flanges 23a, 24a of the busbar tubes 23, 24 can be determined by the internal insulating medium.

Furthermore, the large diameter container 21 can be made lighter by reducing the number of flanges.

[Brief explanation of drawings]

Fig. 1 is a front view showing gas insulated switchgear equipment as an application example of the present invention, Fig. 2 is a front view showing a conventional three-phase finger-shaped insulating spacer unit, and Fig. 3 is the ■A longitudinal cross-sectional view taken along the V line, Fig. 4 is a longitudinal cross-sectional view showing a conventional three-phase finger-shaped busbar, Fig. 5 is a front view of a three-phase finger-shaped insulating spacer, and Fig. 6 is a longitudinal cross-sectional view showing the conventional three-phase finger-shaped insulating spacer. FIG. 7 is a vertical cross-sectional view of a three-phase collective bus bar according to another embodiment of the present invention. 6...Support plate, 7U, 7V, 7W...
...Insulating spacer for single phase, 8U, 8V,
8W...Embedded conductor, 20...Through hole, 21...Large diameter container, 21a, 2 l b
, 22...-internal flange, 23.24...
...Bus bar tube, 23a, 24a...External flange.

Claims (1)

[Claims] 1 Place a three-phase busbar conductor in a container filled with an insulating medium, attach a metal support plate to which three single-phase insulating spacers are fixed to the container, and place the three-phase busbar conductor in a container filled with an insulating medium, and attach a metal support plate to which three single-phase insulating spacers are fixed, approximately in the center of each single-phase insulating spacer. The phase bus conductor is electrically connected to each embedded conductor provided in the container, and the container includes a large-diameter container having an internal flange formed at at least one end in the axial direction, and an external flange connected to the internal flange. One end surface of the support plate is airtightly attached to the internal flange in the large diameter container, and the three single-phase insulating spacers are airtightly attached to the other end surface of the support plate. A three-phase finger-shaped bus bar characterized in that it is installed while maintaining the following characteristics.