JPS584171Y2 - Elephant Hen Atsukino Elephant Case - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to improvements in the structure of a wall-opening bushing within the elephant case of an elephant transformer and the connection structure with a cable head.

In a conventional elephant-type transformer, as shown in FIG. 1, the transformer oil tank wall 1 is
3 is provided with a case 3, and the transformer side lead 14 is connected within the case 3.
A container bushing 1 connected to the cable head 5 passes through the wall 2 and is connected to the cable head 5.

On the outside lead-out side, a cable head 5 is provided inside the case 3 passing through the closing plate 4.

The cable head 5 and the capacitor bushing 1 are connected by tightening the respective terminals 12 with bolts, for example, via a lead 7 coated with an insulating coating 6, and then the terminal portion is An electrical shield 9 was provided together with an insulator 8 so as to surround it.

The elephant case 3 is provided in an oil-tight manner.

11 is a manhole cover for work.

As can be seen from the figures above, the capacitor bushing 1 is long, and the interference electrode 9 at the connection between the capacitor bushing 1 and the lead 7 is fastened to the capacitor bushing 1, and the terminal 12 is fastened on the inside diameter side. must work together.

Therefore, the workability is poor, and the elephant case 3 is also required to be large, which causes transportation problems and increases the overall cost.

The present invention was developed in view of these defects and with the aim of achieving a small size and low cost.

The configuration will be described below based on the drawings.

FIG. 2 is a vertical cross-sectional view of the main parts inside the elephant case of an elephant transformer according to an embodiment of the present invention.

Oil tank wall 1 for deriving the high voltage lead of the transformer, which is not shown in detail.
3 is provided with an elephant case 3 to prevent the live parts from being exposed, and the transformer side leads 14 are connected within this case 3.
The means for connecting the cable head 5 and the cable head 5 is constructed to be as compact as possible.

In this embodiment, the transformer side and the elephant case side are isolated and sealed without providing a wall, and the bushing has a special shape, and as shown in the figure, a flange portion 20 having a center conductor 22 is used.
' forms the bushing part 20, and the flange part 20
' is tightened at the same time when the elephant case 3 and the transformer oil tank wall 13 are tightened and connected, and the elephant case 3 side and the transformer oil tank wall 13 side are sealed and separated, and are integrally made with resin. configured.

Further, a picture electrode 21 is buried in the bushing portion 20 and has one end electrically connected to a center conductor 22 connected to a transformer lead and is provided concentrically surrounding the center conductor 22.

The bushing part 20 is a connecting lead 2 between cables, which will be described later.
6 and the center conductor 22 and to provide good electrical shielding, its longitudinal section is formed in an H-shape.

Therefore, the center conductor side lead portion 27 of the connection lead 26 between the center conductor 22 and the cable head 5 is provided in a flexible manner, for example, in a spiral shape, or a flexible conductor is provided in a longer length.
A terminal 24 is provided at its tip and is tightly connected to a terminal 23 on the other end of the center conductor.

In order to alleviate the potential gradient at the terminal connection portion, a blocking electrode 25 is provided that is fixed to the lead side from near the base of the spiral lead and extends to the tip of the lead to surround the lead.

In addition, the tip of the screen electrode 25 can be inserted into the recess of the H-shaped cross section of the bushing part 20 surrounded by the screen electrode 21 when the terminals 23 and 24 of the center conductor and the lead are connected. It is provided so that it can be inserted and removed as the lead 27 expands and contracts.

The lead portion on the side of the cable head 5 is provided with a flexible lead portion 29 that makes the vicinity of the terminal portion flexible, as shown in the longitudinal cross-sectional view of the principal part showing the lead connection process in FIG.

As shown in FIGS. 4 and 5, the mounting means for the thin picture electrode 25 is provided so that it does not fall off easily. A recess is provided at the position surrounding the picture electrode 21, and a convex part fitted into the concave part and a spring 30 for pressing the convex part inward are provided at the tip of the picture electrode 25.

In this embodiment, a ring-shaped spring is attached to the convex part of the picture electrode, but the center conductor 22 or the center conductor side terminal 23
It may also be a spring supported by.

Further, as shown in FIG. 5, it is preferable to extend the center conductor 22' and attach the guide ring 32.

By doing so, deformation of the convex portion due to the load of the picture electrode 25 can be prevented.

As can be understood from the diagram, the lead connection in the elephant case constructed as described above consists of one thing: the isolation wall is made of an insulating material, and since it is molded with resin integrally with the bushing part, the axial dimension of the bushing part In addition, when connecting the connection lead between the bushing offshore core conductor and the cable head, the lead on the center conductor side can be Since it can be pulled out from the tip of the picture electrode and tightened with bolts, the work is easy, and of course it is also easy to remove the lower part.

As described above, it is possible to provide an inexpensive elephant transformer because the workability in connecting the leads in the elephant case is improved and the shape of the case and other parts is made smaller.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a main part showing a lead connection structure within an elephant case of a conventional elephant transformer. FIG. 2 is a diagram similar to FIG. 1 of an embodiment based on the present invention. FIG. 3 is a diagram similar to FIG. 2 showing the work process when connecting nodes for explanation. 4 and 5 are longitudinal cross-sectional views of main parts of different embodiments showing the lead connection in the bushing portion of FIG. 2, and the attachment device for the picture electrode. 1 is a conventional bushing, 2 is a wall plate, 3 is an elephant case, 4 is a lid on the cable head side, 5 is a cable head, 6 is an insulator, 7 is a lead, 8 is an insulator, 9 is a wire and a picture electrode , 11 is the manhole cover, 13 is the transformer oil tank wall,
20. 20' is a resin-molded bushing part and flange part for isolating and electrically connecting the transformer side and the elephant case side based on the present invention, 21 is the edge and picture electrode, 22 is the center conductor, 23, 24' terminal, 25 hashiya picture electrode, 2
6 is a lead, 27 is a partially expandable lead part, 28
29 is an insulator, 29 is a flexible lead portion, 30 is a spring, and 32 is a guide ring for the shield 25.

Claims (1)

[Scope of utility model registration request] A center conductor to which the transformer side lead is connected to one end is supported in the center, and a picture electrode is buried and supported in the wall surrounding this center conductor and electrically connected to the center conductor, so that the vertical cross section is H-shaped. a bushing part consisting of a flange part molded to isolate and seal the transformer oil tank and the elephant case; and a terminal electrically connected to the other end of the center conductor and having four parts on the outer periphery of the electrode surrounding the bushing part. A cylindrical picture electrode has a convex part fitted into a concave part on the outer periphery of the terminal, a spring that presses the convex part inward at its tip, and a cylindrical picture electrode disposed in the hollow part of the picture electrode with one end thereof. A lead connection structure within an elephant case of an elephant transformer, comprising a flexible lead connected to the terminal and the other end connected to the elephant head.