JPS6115653B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas-filled pipe air busbar used for electrically connecting a transformer and a gas-insulated switchgear, and particularly relates to a gas-filled pipe air busbar used for electrically connecting a transformer and a gas-insulated switchgear, and particularly relates to a gas-filled pipe air busbar used for electrically connecting a transformer and a gas-insulated switchgear, and particularly for connecting a plurality of busbar units. The present invention relates to an air pipe bus bar with an improved structure of one unit in the system.

Some of the pipe aerial busbars have a total length of over several tens of meters, so it is not possible to completely assemble them in a factory and transport them in a completed state. Therefore, the general method is to assemble a 12-meter-long conduit near the transport limit as one bus bar unit at a factory, and then connect these conduits one after another on-site to form a long bus bar. Conventionally, in a pipeline air bus as shown in Fig. 1, high pressure insulating gas 2 such as SF ₆ is used.
In order to support the conductor 3 in the grounded metal case 1 filled with the conductor, a busbar unit structure as shown in FIG. 2 was adopted. That is, in FIG. 2, the conductor 3 is fixed within the metal case 1 by the fixed support insulating part 4. In FIG. However, with this structure, a difference in expansion and contraction occurs between the metal case 1 and the conductor 3 due to temperature changes in the outside air or heat generated by the conductor 3 when energized, and the stress caused by this causes the fixed support insulating part 4 to be destroyed. There is a risk of On the other hand, in order to eliminate the drawbacks shown in FIG. 2, a bus bar unit in which the conductor 3 is supported by a movable supporting and insulating part 5 which is slidable with respect to the metal case 1 is also considered. However, when connecting the unit on-site due to this unit structure, conductor 3
It has been found that the conductor 3 moves in the axial direction and has disadvantages in assembly, such as falling off from the metal case 1, generating metal powder due to the movement, and not being able to clearly position the conductor 3 within the metal case 1.

Therefore, the present invention has been made to eliminate the drawbacks of the above-mentioned techniques, and improves the workability when connecting busbar units, without degrading the electrical characteristics of the pipe air busbar. Moreover, it is an object of the present invention to provide a conduit aerial busbar having a busbar unit structure that can avoid the generation of thermal stress due to temperature fluctuations after assembly.

The present invention will be described below with reference to an embodiment shown in FIGS. 4 to 6. A conductor 3 is placed inside a metal case 1 constituting a bus unit which is a transport unit.
are insulated and held by one fixed support insulator 4 and one movable support insulator 5. A contact 6 is attached to one end of the conductor 3 for electrically connecting the conductor 3 to other busbar units. The contact 6 attachment end of the conductor 3 is located inward from the metal case 1 end, and the movable support side end of the conductor 3 protrudes from the metal case 1 end. FIG. 5 shows a specific example of the fixed support insulating part 4. High pressure shield 42 and low pressure shield 4 fixed to post type spacer 41
3 is fixed to the conductor 3 and the metal case 1 with a high-voltage side support fitting 44, a low-voltage side support fitting 45, and a bolt 46, respectively. On the other hand, FIG. 6 shows a specific example of the movable support insulating section 5. As shown in FIG. Post type spacer 41
A high voltage shield 42 is fixed to the conductor 3 with fully threaded bolts 47. The low pressure shield 43 fixed to the post type spacer 41 is defined by a low pressure side support fitting 45 and a bolt 46. A resin 48 such as Teflon (trade name of DuPont) is embedded in the surface of the low-voltage side support fitting 45 facing the metal case 1 side, which mechanically supports the low-voltage side support fitting 45 and at the same time supports the axial direction of the conductor 3. This makes it possible to move around. Further, a spring 49 and a metal button 50 provided inside the resin 48 keep the low voltage shield 43 at ground potential.

Next, the process of connecting the busbar unit constructed as described above is shown in FIGS. 7a to 7c. First, when connecting the middle unit B to the leftmost unit A in Fig. 7a, the leftmost unit A is fixed.
Move unit B in the middle closer. After confirming that the conductor 3 of the middle unit B is docked to the contact 6 of the leftmost unit A,
Connect the metal cases 1 of B by welding or the like. At this time, since the conductor 3 is fixed to the metal case 1 at one place, not only the conductor 3 may fall off from the metal case 1, but also the axial direction of the conductor 3 due to the resistance when docking the contact 6 and the conductor 3. There is no movement etc. Therefore, the connection between the conductor 3 and the contactor 6 is ensured, and no metal powder or the like is generated. That is, units A and B can be connected easily and reliably. Connect the rightmost unit C to the middle unit B in the same way, and continue this process as many times as necessary to connect and assemble each unit. The pipeline air bus constructed in this way is connected to each unit A, B, and C.
Since one part of each of the supporting parts is movable in the axial direction, metal case 1 can be moved due to temperature fluctuations.
The occurrence of thermal stress due to relative movement to the conductor 3 can be prevented.

Note that the present invention is not limited to the above-mentioned embodiments, and the following configuration can also be adopted. That is, other embodiments of the present invention are shown in FIGS. 8 and 9. Components that are the same as those in the embodiment shown in FIG. 4 are designated by the same reference numerals, and description thereof will be omitted. FIG. 8 shows a case in which one disk-type (or cone-shaped) fixed supporting insulating section 7 and two movable supporting insulating sections 5 are provided for gas division. Further, FIG. 9 shows the case of a three-phase pipe air bus bar unit.

As explained above, according to the conduit air bus using the bus unit of the present invention, the conductor on the side provided with the contact is fixed to the metal case by the first support insulating part, and the conductor on the other side of the conductor is Since it is movably supported with respect to the metal case by the second supporting insulating part, the following effects can be obtained.

(a) Since the supporting insulating part is fixed at one place, there is no movement of the conductor during the unit connection work, and the connection between the conductors can be made reliably, and the work itself is made easier.

(b) Since there is no movement of the conductor, there is no deterioration of the electrical characteristics of the pipe air bus due to the generation of metal powder.

(c) Since one example of the conductor is a movable support, it is possible to prevent the occurrence of thermal stress due to temperature fluctuations.

[Brief explanation of the drawing]

FIG. 1 is an external view of a pipe air bus, FIG. 2 is a configuration diagram showing a conventional pipe air bus unit, and FIG. 3 is a configuration diagram showing a pipe air bus unit prior to the present invention. FIG. 4 is a configuration diagram showing one embodiment of the pipe line aerial busbar unit of the present invention, and FIGS. A sectional view showing an embodiment of the fixed and movable supporting insulating part as seen in FIGS. 7a and 7b.
and c are schematic diagrams showing how the units configured as shown in FIG. 4 are connected to form a long pipe air bus bar, respectively, and FIGS. 8 and 9 are configurations showing other embodiments of the present invention. It is a diagram. DESCRIPTION OF SYMBOLS 1... Metal case, 3... Conductor, 4... Fixed support insulating part, 5... Movable support insulating part, 41... Post type spacer, 43... Low voltage shield, 46...
Bolt, 47...Zen screw bolt, 48...Resin, 49...Spring 50...Metal button.

Claims (1)

[Scope of Claims] 1. In a conduit air bus bar formed by inserting and supporting a conductor through a supporting insulator into a metal case filled with an insulating gas, the conductor support is connected to the axis of the conductor relative to the metal case. An air conduit characterized in that it is supported by a fixed supporting insulating part that restricts directional movement and a movable supporting insulating part that allows the conductor to move in the axial direction with respect to the metal case, forming one transport busbar unit. Bus line. 2. The conduit aerial busbar according to claim 1, wherein one side of the conductor is supported by a fixed supporting insulating part relative to the metal case, and the other side of the conductor is supported by a movable supporting insulating part relative to the metal case. . 3. A post-type spacer is used as a support insulator for the transport bus unit, and the fixed support insulator is constructed by bolting the metal case support fittings and the post-type spacer, as well as the conductor and the post-type spacer, and the movable support insulator. In this patent, the conductor and the post-type spacer are connected by bolts, and between the metal case and the post-type spacer, a sliding part is provided on the low-voltage shield side of the post-type spacer, allowing the conductor to move relative to the metal case. A pipe air busbar according to claim 1.